CN218093002U - Supercritical/liquid CO2 fracturing fluid drag reduction/sand carrying integrated evaluation device - Google Patents
Supercritical/liquid CO2 fracturing fluid drag reduction/sand carrying integrated evaluation device Download PDFInfo
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- CN218093002U CN218093002U CN202222375383.3U CN202222375383U CN218093002U CN 218093002 U CN218093002 U CN 218093002U CN 202222375383 U CN202222375383 U CN 202222375383U CN 218093002 U CN218093002 U CN 218093002U
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Abstract
The utility model discloses a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device comprises supercritical/liquid CO 2 The system comprises a pumping system, a shaft friction measurement system, a dynamic sand-carrying visualization system and a data acquisition and analysis system; the shaft friction measurement system and the dynamic sand-carrying visualization system are connected in parallel with the supercritical/liquid CO through a three-way electric ball valve 2 Pump injection system, shaft friction measurement system and dynamic sand-carrying visualization systemAnd supercritical/liquid CO 2 The pumping system is connected with the data acquisition and analysis system. Can automatically change a drag reduction/sand carrying test mode through an electric ball valve to complete supercritical/liquid CO at one time 2 Measuring friction resistance of a fracturing fluid well barrel and simulating dynamic sand carrying of a crack; by using the dynamic sand-carrying visualization system and the shaft friction measurement system, the liquid/supercritical CO can be measured under the conditions of high temperature, low temperature (-30-200 ℃) and high pressure (60 MPa) 2 The friction resistance characteristic and the dynamic sand carrying rule of the fracturing fluid.
Description
Technical Field
The utility model relates to an oil gas field fracturing transformation technique indoor evaluation equipment field, in particular to supercritical/liquid CO 2 Fracturing fluid drag reduction/sand carrying integrated evaluation device.
Background
Anhydrous CO 2 The fracturing technology is used as a new generation of low-damage fracturing technology applied to unconventional oil and gas resources, and has the characteristics of no residue, low reservoir damage, low surface tension (0 in a supercritical state), easy reservoir communication, rapid and thorough flowback, low pollution, capability of being dissolved in crude oil to reduce the viscosity of the crude oil, replacement of methane for gas extraction, high gas yield, realization of CO2 sequestration and the like. Anhydrous CO since the 80's of the 20 th century 2 The fracturing technology realizes excellent application effect in mine sites in North America regions, and proves that anhydrous CO 2 The fracturing technology has excellent technical feasibility and input-output ratio.
At present, anhydrous CO 2 The fracturing technology is successfully applied to a plurality of blocks of Jilin oil fields and Changqing oil fields in China, and has good application prospects in excavating the potential of unconventional oil and gas reservoirs in China and promoting the continuous, efficient and green development of the unconventional oil and gas fields in China. Anhydrous CO 2 The fracturing medium of the fracturing fluid is liquid/supercritical CO 2 The viscosity of the system is about 0.002-0.17 mPa.s in the fracturing construction process, and the system has anhydrous CO 2 After entering the crack, the flow velocity can be greatly reduced to cause the rapid reduction of the sand carrying capacity, and sand removal is easy to generate to cause sand blocking,is not beneficial to fracturing and crack making and has no water CO 2 The problems of high friction resistance and poor sand suspension/carrying capacity of a system shaft are urgently needed to be overcome in engineering application.
Increasing anhydrous CO by adding a thickening agent 2 The sand-carrying capacity of a fracturing system is a currently recognized effective method. However, anhydrous CO 2 Is a non-polar liquid and is only miscible with non-polar thickeners. At the same time, during the fracturing process, CO 2 The phase state change is complex, and the physicochemical property of the mixed phase system is greatly influenced by temperature and pressure. On one hand, the existing evaluation device has single test function, single temperature condition and limited pressure resistance and cannot meet the requirement of guiding the fracturing modification technology of an oil-gas field; on the other hand, the conventional shaft friction resistance evaluation device is mostly suitable for water-based fracturing fluids such as slickwater fracturing fluid and gel fracturing fluid and is also suitable for CO 2 The evaluation device for the dynamic sand carrying capacity of the dry fracturing fluid is more rarely reported. The invention patent CN 104007043B provides a multifunctional fracturing fluid experiment system, and relates to CO 2 Evaluation of wellbore friction resistance and sand suspension performance of dry fracturing fluid, however, CO is not considered in the patent 2 The addition of chemical agents such as thickening agents in the dry fracturing fluid has the limitation of single test system, and meanwhile, the observation of the suspension state of the propping agent in the fracturing fluid through a multi-stage window belongs to a static evaluation method, so that CO cannot be truly simulated 2 The dynamic migration process of the proppant in the fracture in the dry fracturing process. Therefore, a simulated anhydrous CO is designed and developed 2 In the fracturing process, the device for evaluating the shaft drag reduction capability and the fracture dynamic sand carrying capability of the system under the conditions of high temperature, low temperature and full phase state is used for anhydrous CO 2 The popularization and application of the fracturing technology in oil and gas field development fields are very important.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device can evaluate anhydrous CO at one time under the conditions of high and low temperature change, pressure change and thickening agent addition 2 The fracturing fluid system has friction resistance in shafts with different pipe diameters and sand carrying capacity in formation cracks with different sizes, and can better guide an oil-gas field fracturing transformation technology.
Specifically, the method comprises the following technical scheme:
supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device comprises supercritical/liquid CO 2 The system comprises a pumping system, a shaft friction measurement system, a dynamic sand-carrying visualization system and a data acquisition and analysis system;
the shaft friction measurement system and the dynamic sand-carrying visualization system are connected in parallel to the supercritical/liquid CO through a three-way electric ball valve 2 Pump injection system, wellbore friction measurement system, dynamic sand-carrying visualization system and supercritical/liquid CO 2 And the pumping and injecting systems are connected with the data acquisition and analysis system.
In one possible design, the supercritical/liquid CO 2 The pumping system comprises a gas storage bottle, a gas purifier, a gas refrigerator and a CO-resistant system 2 Flow meter, liquid CO 2 The device comprises a plunger pump, a heater, a first high-pressure-resistant quartz glass window, a liquid proportioning pump, an additive storage tank, a first pressure sensor and an automatic sand adding device;
the gas storage cylinder sequentially passes through the gas purifier, the gas refrigerator and the CO resistance 2 Flow meter, and liquid CO 2 The inlet end of the plunger pump is communicated, a first valve is arranged between the gas storage bottle and the gas purifier, and the gas refrigerator is provided with a first pressure sensor;
the liquid CO 2 The outlet end of the plunger pump is divided into two paths, one path is communicated with one end of the heater, and the liquid CO is 2 A second valve is arranged between the outlet end of the plunger pump and one end of the heater; the automatic sand adding device is provided with a pressurizing end and a sand adding end; the other path is communicated with the pressurizing end of the automatic sand adding device, and the liquid CO 2 A third valve is arranged between the outlet end of the plunger pump and the pressurizing end of the automatic sand adding device; the sand adding end of the automatic sand adding device is communicated with the dynamic sand carrying visualization system;
one end of the heater is also communicated with the additive storage tank through a liquid proportioning pump; a fourth valve is arranged between the heater and the liquid proportional pump;
the other end of the heater is communicated with the three-way electric ball valve through the first high-pressure-resistant quartz glass window;
the first pressure sensor is CO-resistant 2 Flow meter, liquid CO 2 The plunger pump, the heater, the liquid proportioning pump and the automatic sand adding device are all electrically connected with the data acquisition and analysis system.
In one possible design, the liquid proportional pump is a servo constant flow pump.
In one possible design, the shaft friction measuring system comprises a simulation shaft, a second high-pressure-resistant quartz glass window, a differential pressure sensor and a first back pressure valve;
the inlet end of the simulated shaft is communicated with the three-way electric ball valve, and a fifth valve is arranged between the simulated shaft and the three-way electric ball valve; the outlet end of the simulation shaft is sequentially communicated with the second high-pressure-resistant quartz glass window and the first backpressure valve, and a sixth valve is arranged between the second high-pressure-resistant quartz glass window and the first backpressure valve;
two ends of the differential pressure sensor are respectively connected with the inlet end and the outlet end of the simulation shaft; a seventh valve is arranged between the differential pressure sensor and the inlet end of the simulation shaft, and an eighth valve is arranged between the differential pressure sensor and the outlet end of the simulation shaft;
the pressure sensor and the first backpressure valve are electrically connected with the data acquisition and analysis system.
In one possible design, a plurality of simulation mineshafts, a plurality of second high-pressure-resistant quartz glass windows and a plurality of differential pressure sensors can be arranged, the outlet end of each simulation mineshaft is communicated with one end of one second high-pressure-resistant quartz glass window, and the outlet ends of the plurality of simulation mineshafts are connected in parallel to the three-way electric ball valve; a valve is arranged between each simulated shaft and the three-way electric ball valve; the other end of each second high-pressure-resistant quartz glass window is connected with the first backpressure valve in parallel, and a valve is arranged between each second high-pressure-resistant quartz glass window and the first backpressure valve; the two ends of each differential pressure sensor are respectively connected with the inlet end and the outlet end of one simulated shaft, a valve is arranged between each differential pressure sensor and the inlet end of the simulated shaft, and a valve is arranged between each differential pressure sensor and the outlet end of the simulated shaft.
In one possible design, the plurality of simulated wellbores differ in pipe diameter.
In one possible design, the dynamic sand-carrying visualization system comprises a self-balancing pressure experiment cabin, a heatable circulating water liquid supplementing pump, a pressure balance converter, a sand setting tank and a second back pressure valve;
a visual crack model is arranged in the self-balancing pressure experiment chamber, and the self-balancing pressure experiment chamber is provided with an inlet, an outlet, a liquid supplementing port and a balancing port;
the inlet of the self-balancing pressure experiment cabin is communicated with the three-way electric ball valve, the inlet of the self-balancing pressure experiment cabin is also communicated with the sand adding end of the automatic sand adding device, and a ninth valve is arranged between the inlet of the self-balancing pressure experiment cabin and the sand adding end of the automatic sand adding device;
the outlet of the self-balancing pressure experiment chamber is communicated with the second backpressure valve through a grit tank, and a tenth valve is arranged between the grit tank and the second backpressure valve;
the liquid supplementing port of the self-balancing pressure experiment chamber is communicated with the heatable circulating water liquid supplementing pump, and an eleventh valve is arranged between the liquid supplementing port of the self-balancing pressure experiment chamber and the heatable circulating water liquid supplementing pump;
the balance port of the self-balancing pressure experiment chamber is communicated with one end of the pressure balance converter, and the other end of the pressure balance converter is communicated with the inlet of the self-balancing pressure experiment chamber;
the second backpressure valve is electrically connected with the data acquisition and analysis system.
In one possible design, the self-balancing pressure experiment chamber main body is constructed as a hollow cylinder.
In a possible design, the side wall of the self-balancing pressure experiment chamber is provided with at least one window, a camera is arranged outside the window, and the camera is electrically connected with the data acquisition and analysis system.
In one possible design, a sand screen is arranged in the sand setting tank.
The embodiment of the utility model provides a technical scheme's beneficial effect includes at least:
the utility model provides a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is provided with a device for evaluating the resistance of the fracturing fluid in supercritical/liquid CO 2 The capability of internally matching and injecting the liquid thickening agent and the gaseous additive can effectively construct the supercritical/liquid CO of the whole existing system 2 A fracturing fluid; simultaneously to the technical defect that current evaluation device test function is single, temperature condition is single, withstand voltage is limited (especially current visual model), the utility model provides a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device can automatically change a drag reduction/sand carrying test mode through an electric ball valve, and can complete the supercritical/liquid CO of the whole system at one time 2 Measuring the friction resistance of the fracturing fluid well cylinder and simulating dynamic sand carrying of the fracture; meanwhile, the high-low temperature (-30-200 ℃) and high-pressure (60 MPa) conditions provided by the device can effectively simulate CO in the fracturing process 2 The phase change can establish a digital plane coordinate real-time quantitative analysis proppant migration condition through a data acquisition and analysis system, continuously measure the drag reduction rate under different flow rates, and automatically form a relation chart between the fracturing fluid flow rate and the drag reduction rate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only intended to schematically illustrate and explain the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive efforts.
FIG. 1 shows a supercritical/liquid CO according to an embodiment of the present invention 2 The structural schematic diagram of the fracturing fluid drag reduction/sand carrying integrated evaluation device;
FIG. 2 shows a second supercritical/liquid CO according to an embodiment of the present invention 2 A structural schematic diagram of a fracturing fluid drag reduction/sand carrying integrated evaluation device;
FIG. 3 is a third embodiment of the present invention, which provides a supercritical/liquid CO 2 The structural schematic diagram of the fracturing fluid drag reduction/sand carrying integrated evaluation device;
FIG. 4 shows a fourth supercritical/liquid CO according to an embodiment of the present invention 2 The structural schematic diagram of the fracturing fluid drag reduction/sand carrying integrated evaluation device;
fig. 5 is a schematic structural diagram of a pressure balance converter according to an embodiment of the present invention;
FIG. 6 shows a fifth exemplary supercritical/liquid CO according to an embodiment of the present invention 2 The structural schematic diagram of the fracturing fluid drag reduction/sand carrying integrated evaluation device;
in the figure: 101. supercritical/liquid CO 2 Pump injection system, 102 shaft friction measurement system, 103 dynamic sand-carrying visualization system, 104 data acquisition and analysis system, 105 three-way electric ball valve, 1 gas storage bottle, 2 gas purifier, 3 gas refrigerator, 4 CO-resistant 2 Flowmeter, 5. Liquid CO 2 The system comprises a plunger pump, 6 a coil heater, 7 a first high-pressure-resistant quartz glass window, 8 a liquid proportioning pump, 9 an additive storage tank, 10 a first pressure sensor, 11 a simulation shaft, 12 a second high-pressure-resistant quartz glass window, 13 a differential pressure sensor, 14 an automatic sand feeding device, 15 a self-balancing pressure experiment chamber, 16 a circulating water heating fluid infusion pump, 17 a pressure balance converter, 18 a sand setting tank, 19 a camera, 20 a heat preservation sleeve, 21 a cover cylinder, 22 a pressure-resistant two-way container, 23 a sealing movable partition, 24 a first inner cavity, 25 a second inner cavity, 26 a water injection port, 27 a liquid injection port, 301 a first back pressure valve and 302 a second back pressure valve.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe the embodiments of the present invention in further detail with reference to the accompanying drawings.
Anhydrous CO 2 The fracturing technology is a new technology developed in recent years and hardly storesThe layers cause damage and all fracture cracks are essentially effective cracks. But liquid CO 2 The self viscosity is very low, the sand carrying capacity is poor, the friction pressure drop is large, liquid is easy to be filtered out to the stratum, sand removal is easy to generate to cause sand blocking, and fracturing and crack making are not facilitated. It is presently recognized that the most effective method is to increase the anhydrous CO by adding a thickener 2 Sand-carrying capacity of the fracturing system.
However, during the fracturing process, CO 2 The phase state change is complex, and the physicochemical property of the mixed phase system is greatly influenced by temperature and pressure. Therefore, research evaluation simulates anhydrous CO 2 In the fracturing process, the resistance reduction capability and the dynamic sand carrying capability of a shaft of the system are evaluated under the conditions of high temperature, low temperature and full phase state for anhydrous CO 2 The popularization and application of the fracturing technology in oil and gas field development fields are very important.
In order to solve the problems in the related art, embodiments of the present invention provide a supercritical/liquid CO 2 Fracturing fluid drag reduction/sand carrying integrated evaluation device.
As shown in FIG. 1, a supercritical/liquid CO 2 The integrated evaluation device for drag reduction and sand carrying of fracturing fluid mainly comprises supercritical/liquid CO 2 A pumping system 101, a shaft friction measurement system 102, a dynamic sand-carrying visualization system 103 and a data acquisition and analysis system 104;
supercritical/liquid CO 2 The primary function of the pumping system 101 includes providing supercritical/liquid CO 2 Preparing supercritical/liquid CO 2 A fracturing fluid system which is used for automatically mixing a propping agent and providing a test basic pump injection and discharge capacity;
the main function of the shaft friction measurement system 102 is to evaluate the supercritical/liquid CO at different pump injection volumes and different pipe diameters 2 The drag reduction capability of the fracturing fluid system;
the dynamic sand-carrying visualization system 103 has the main functions of evaluating supercritical/liquid CO under the conditions of different pump injection capacities, high and low temperature changes, pressure changes and thickener addition 2 The sand carrying capacity of the fracturing fluid system in the stratum fractures with different sizes;
the data acquisition and analysis system 104 has the main functions of realizing remote detection and control of the operation of the integrated device and real-time acquisition of test data such as pressure, temperature, flow and the like, and analyzing the test data through off-line processing software;
the shaft friction measurement system 102 and the dynamic sand-carrying visualization system 103 are connected in parallel to the supercritical/liquid CO through a three-way electric ball valve 105 2 A pumping system 101, a wellbore friction measurement system 102, a dynamic sand-carrying visualization system 103 and supercritical/liquid CO 2 The pumping system 101 is connected to a data acquisition and analysis system 104.
The embodiment of the utility model provides a supercritical/liquid CO 2 The application method of the fracturing fluid drag reduction/sand carrying integrated evaluation device comprises the following steps:
by supercritical/liquid CO 2 Pump injection system 101 automatic blending supercritical/liquid CO 2 The fracturing fluid system and proppant are selected to carry out supercritical/liquid CO separation through the three-way electric ball valve 105 2 Performing a shaft friction test or a sand carrying capacity test on the fracturing fluid, analyzing and processing data in the test process through the data acquisition and analysis system 104, and finally obtaining supercritical/liquid CO 2 And (3) evaluating the drag reduction capability of the fracturing fluid system under different pump injection capacities and different pipe diameters and the sand carrying capability of the fracturing fluid system in stratum fractures with different sizes.
The embodiment provided by the utility model can once only accomplish supercritical/liquid CO through the automatic change drag reduction of electric ball valve/sand-carrying test pattern 2 Measuring friction resistance of a fracturing fluid well barrel and simulating dynamic sand carrying of a crack; under the conditions of high temperature, low temperature and full phase state, by simulating anhydrous CO 2 The fracturing process can completely evaluate the drag reduction capability and the dynamic sand carrying capability of a system shaft and can carry out the treatment on anhydrous CO 2 The popularization of the fracturing technology in the oil and gas field development field has an important role.
In one possible design, shown in FIG. 2, supercritical/liquid CO 2 The pump injection system comprises a gas storage bottle 1, a gas purifier 2, a gas refrigerator 3 and CO resistance 2 Flowmeter 4, liquid CO 2 The device comprises a plunger pump 5, a heater 6, a first high-pressure-resistant quartz glass window 7, a liquid proportioning pump 8, an additive storage tank 9, a first pressure sensor 10 and an automatic sand adding device 14;
the gas storage cylinder 1 sequentially passes through a gas purifier 2, a gas refrigerator 3 and CO resistance 2 Flow meter 4 with liquid CO 2 The inlet end of the plunger pump 5 is communicated, a first valve 201 is arranged between the gas storage bottle 1 and the gas purifier 2, and the gas refrigerator 3 is provided with a first pressure sensor 10;
liquid CO 2 The outlet end of the plunger pump 5 is divided into two paths, one path is communicated with one end of the heater 6, and liquid CO 2 A second valve 202 is arranged between the outlet end of the plunger pump 5 and one end of the heater 6; the automatic sand adding device 14 is provided with a pressurizing end and a sand adding end; the other path is communicated with the pressurizing end of the automatic sand adding device 14, and liquid CO 2 A third valve 203 is arranged between the outlet end of the plunger pump 5 and the pressurizing end of the automatic sand adding device 14; the sand adding end of the automatic sand adding device 14 is communicated with the dynamic sand carrying visualization system 103;
one end of the heater 6 is also communicated with an additive storage tank 9 through a liquid proportioning pump 8; a fourth valve 204 is arranged between the heater 6 and the liquid proportional pump 8;
the other end of the heater 6 is communicated with a three-way electric ball valve 105 through a first high-pressure-resistant quartz glass window 7;
It will be appreciated that the gas cylinder 1 is used to provide CO 2 、N 2 When the air source is used, a plurality of air cylinders can be connected in parallel according to the test requirements, so that the pumping of air with different proportions can be realized. The specific specifications may be selected as desired, and are typically conventional laboratory gas specifications, such as: CO2 2 The bottle body of the gas storage bottle is pressure-resistant at 13MPa, the volume is 40L, and the gas storage bottle is fully loaded with CO 2 The pressure is 4-5 Mpa.
It will be appreciated that the gas purifier 2 is used to pre-treat the gas to be fed to the gas refrigerator 3 for pre-drying and impurity removal to prevent contamination of the environment within the test system by moisture, impurities, etc.
It will be appreciated that the gas purifier 2 may be constructed and made of any material as desired.
It will be appreciated that the gas refrigerator 3 is located downstream of the gas purifier 2, the primary function being to remove anhydrous CO 2 Cooling to obtain supercritical/liquid CO 2 。
Optionally, gas refrigerator 3 pairs of CO 2 The refrigeration temperature control range is-15 ℃ to 25 ℃, and the temperature control precision is +/-0.5 ℃.
It is understood that the resistance to CO is 2 The flow meter 4 is used for detecting the flow of the pipeline in the system.
Optionally, liquid CO 2 The plunger pump 5 is a frequency modulation three-plunger pump, the discharge capacity is 400L/h, the maximum working pressure is 40MPa, and the minimum suction pressure is 3MPa.
Optionally, liquid CO 2 The plunger pump 5 is provided with a cooling pump head, the lower limit of the refrigeration temperature of the pump head is-15 ℃, and the plunger pump is used for realizing supercritical/liquid CO 2 While providing a system pressure stabilizing effect.
Optionally, the heater 6 is a coil heater.
It will be appreciated that the additive storage tank 9 is used to store and configure supercritical/liquid CO 2 The fracturing fluid liquid additive can select the specific type of the thickening agent according to the requirement so as to increase the anhydrous liquid CO 2 The viscosity of the fracturing fluid and a foam fracturing fluid system constructed according to the requirements.
It will be appreciated that the liquid proportioning pump 8 is used to pump liquid additive into the pipeline to achieve additive and supercritical/liquid CO 2 And (3) online mixing.
In one possible design, the liquid proportional pump 8 is a servo constant flow pump, and the pressure and flow rate of the pump are controlled by a servo controller and a PLC control technology.
Optionally, the maximum injection flow of the servo constant flow pump is 1000mL/min, and the servo constant flow pump has a pressure upper and lower limit protection function.
It will be appreciated that the first high pressure resistant quartz glass window 7 is used for viewing supercritical/liquid CO 2 Flow regime and observation of supercritical/liquid CO 2 Mixed state with additives.
Optionally, the upper limit of the withstand voltage of the first high-pressure-resistant quartz glass window 7 is 50Mpa.
It should be noted that the main function of the automatic sand adding device 14 is that the automatic sand adding device 14 adds the proppant into the supercritical/liquid CO during the dynamic sand carrying process 2 In a fracturing fluid.
It should be noted that the structure of the automatic sand adding device 14 is the same as the prior art and is not described herein again.
In one possible design, as shown in fig. 3, the wellbore friction measurement system 102 includes a simulated wellbore 11, a second high pressure resistant quartz glass window 12, a differential pressure sensor 13, and a first back pressure valve 301;
one end of the simulated shaft 11 is communicated with the three-way electric ball valve 105, and a fifth valve 205 is arranged between one end of the simulated shaft 11 and the three-way electric ball valve 105; the other end of the simulated shaft 11 is sequentially communicated with a second high-pressure-resistant quartz glass window 12 and a first backpressure valve 301, and a sixth valve 206 is arranged between the second high-pressure-resistant quartz glass window 12 and the first backpressure valve 301;
two ends of the differential pressure sensor 13 are respectively connected with the inlet end and the outlet end of the simulation shaft 11; a seventh valve 207 is arranged between the differential pressure sensor 13 and the inlet end of the simulated shaft 11, and an eighth valve 208 is arranged between the differential pressure sensor 13 and the outlet end of the simulated shaft 11;
It will be appreciated that the differential pressure sensor 13 monitors the differential pressure at the inlet and outlet ends of the simulated wellbore 11 for measuring supercritical/liquid CO 2 And (4) friction resistance of the fracturing fluid well casing.
Optionally, the measuring range of the differential pressure sensor 13 is 0-600 kPa, and the accuracy is 0.01kPa.
Optionally, two ends of the differential pressure sensor 13 are communicated through a pipeline, and a valve is arranged on the pipeline to protect the differential pressure sensor.
It will be appreciated that the second high pressure resistant quartz glass window 12 is used to observe supercritical/liquid CO in the circulation line 2 The state of the fracturing fluid after exiting the wellbore.
In one possible design, a plurality of simulated shafts 11, a plurality of second high-pressure-resistant quartz glass windows 12 and a plurality of differential pressure sensors 13 can be arranged, the outlet end of each simulated shaft 11 is communicated with one end of one second high-pressure-resistant quartz glass window 12, and the outlet ends of the plurality of simulated shafts 11 are connected in parallel with a three-way electric ball valve 105; a valve is arranged between each simulated shaft 11 and the three-way electric ball valve 105; the other end of each second high-pressure-resistant quartz glass window 12 is connected in parallel with the first backpressure valve 301, and a valve is arranged between each second high-pressure-resistant quartz glass window and the first backpressure valve 301; two ends of each differential pressure sensor 13 are respectively connected with an inlet end and an outlet end of a simulated shaft 11, a valve is arranged between each differential pressure sensor 13 and the inlet end of the simulated shaft 11, and a valve is arranged between each differential pressure sensor 13 and the outlet end of the simulated shaft 11.
In one possible design, the plurality of simulated wellbores 11 differ in pipe diameter.
Optionally, the pipe diameter length of the simulated shaft is 5m, and the pressure resistance is 50MPa.
Optionally, the simulated wellbore 11 has 3 pipe diameters: 5mm, 7mm, 9mm, and 5m in length
It will be appreciated that the second high pressure resistant quartz glass window 12 is used to observe supercritical/liquid CO in the circulation line 2 The state of the fracturing fluid after exiting the wellbore.
Optionally, the first high pressure resistant quartz glass window 7 and the second high pressure resistant quartz glass window 12 are made of the same material, and the upper limit of withstand voltage is 50Mpa
In one possible design, as shown in fig. 4, dynamic sand-carrying visualization system 103 includes self-balancing pressure experiment chamber 15, heatable circulating water make-up pump 16, pressure balance converter 17, sand settling tank 18, and second backpressure valve 302;
a visual crack model is arranged in the self-balancing pressure experiment chamber 15, and the self-balancing pressure experiment chamber 15 is provided with an inlet, an outlet, a fluid infusion port and a balance port;
an inlet of the self-balancing pressure experiment chamber 15 is communicated with the three-way electric ball valve 105, the inlet of the self-balancing pressure experiment chamber 15 is also communicated with a sand adding end of the automatic sand adding device 14, and a ninth valve 209 is arranged between the inlet of the self-balancing pressure experiment chamber 15 and the sand adding end of the automatic sand adding device 14;
the outlet of the self-balancing pressure experiment chamber 15 is communicated with a second backpressure valve 302 through a grit tank 18, and a tenth valve 210 is arranged between the grit tank 18 and the second backpressure valve 302;
a liquid supplementing port of the self-balancing pressure experiment chamber 15 is communicated with the heatable circulating water liquid supplementing pump 16, and an eleventh valve 211 is arranged between the liquid supplementing port of the self-balancing pressure experiment chamber 15 and the heatable circulating water liquid supplementing pump 16;
a balance port of the self-balancing pressure experiment chamber 15 is communicated with one end of a pressure balance converter 17, and the other end of the pressure balance converter 17 is communicated with an inlet of the self-balancing pressure experiment chamber 15;
It should be noted that a fluid infusion port of the self-balancing pressure experiment chamber 15 is connected with a circulating water infusion pump 16 capable of heating to infuse water or heat conducting oil into the chamber body, and the self-balancing pressure experiment chamber 15 balances the internal and external pressure difference of the visual crack model through a pressure balance converter 17, so as to realize high pressure resistance of the visual crack model.
Alternatively, the pressure balance transformer 17 has a structure as shown in fig. 5, and includes a mantle 21, a pressure-resistant two-way vessel 22 connected to one end of the mantle; a sealing movable partition 23 is arranged in the middle of the pressure-resistant two-way container 22, and the sealing movable partition 23 divides the pressure-resistant two-way container 22 into a first inner cavity 24 and a second inner cavity 25 from bottom to top; the bottom of the first inner cavity 24 is provided with an anhydrous CO injection tube 2 And a liquid injection port 27 of the fracturing fluid system, and a water injection port 26 communicated with the heatable circulating water fluid infusion pump 16 is arranged at the top of the second inner cavity 25.
It will be appreciated that the pressure in the first chamber 24 can be matched to the pressure in the visual fracture model by the pressure balance switch 17, and the pressure in the second chamber 25 can be matched to the pressure in the self-balancing pressure experiment chamber 15.
In one possible design, the self-balancing pressure experiment chamber 15 body is configured as a hollow cylinder.
It should be noted that the visual fracture model is pushed into the cavity of the self-balanced pressure experiment chamber 15 by the pushing and moving mechanism to provide simulated formation pressure and temperature conditions.
It can be understood that the self-balancing pressure experiment chamber 15 is respectively connected with the pressure balance converter 17 and the heatable circulating water infusion pump 16. The quick liquid supplement of the self-balancing pressure experiment cabin 15 can be realized, and the internal and external pressure balance of the visual crack model can be realized.
In one possible design, as shown in fig. 4, the side wall of the self-balancing pressure experiment chamber 15 is provided with at least one window, a camera 19 is arranged outside the window, and the camera 19 is electrically connected with the data acquisition and analysis system 104.
Optionally, the number of the windows is 3-4, and the windows are used for recording anhydrous CO in the cracks by a camera 2 And (3) the sand carrying migration rule of a fracturing fluid system.
Optionally, a light source is arranged on the other side of the window and used for lighting the camera, so that the camera can record the migration rule more clearly.
Optionally, the window is a sapphire quartz glass window, and the pressure resistance is 60MPa.
Optionally, one end of the self-balancing pressure experiment chamber 15 is provided with an electric heating rod jack, and the other end is provided with a pressure relief hole.
It should be noted that the electric heating rod jack is used for inserting an electric heating rod to heat the whole cavity so as to simulate the formation temperature, and the pressure relief hole is used for relieving pressure after the experiment is finished and taking out the fracture model.
Optionally, the self-balancing pressure experiment chamber 15 can resist pressure of 60Mpa, and the upper limit of the temperature in the chamber can be maintained to be 200 ℃ through electric heating.
In one possible design, the grit chamber 18 is provided with a sand screen for separating supercritical/liquid CO 2 Solid proppant within the fracturing fluid.
Optionally, supercritical/liquid CO 2 Thermal insulation sleeves are arranged on the outer sides of connecting pipelines in the fracturing fluid drag reduction/sand carrying integrated evaluation device so as to stabilize the temperature of the pipelines.
Alternatively, the data collection and analysis system 104 may be a computer.
Optionally, the data collecting and analyzing system 104 includes a data collecting module and a data transmitting module, and the data collecting module monitors and collects the working data in the system in real time, and transmits the data to the software online analyzing system in real time through the data transmitting module.
The software online analysis system comprises a control part and an analysis part, wherein the control part is used for analyzing the acquired experimental data through the working state and working parameters of the whole system of the controller, intelligently identifying and drawing the appearance of the sand bank by using image recognition software, and establishing a digital plane coordinate to quantitatively analyze the migration condition of the propping agent in real time. The drag reduction rate under different flow rates is continuously measured, and a relation chart between the fracturing fluid flow rate and the drag reduction rate can be automatically formed.
Supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device also comprises a safety protection system, which is used for protecting the safety of the system, avoiding overpressure phenomenon and implementing overflow protection; the upper limit protection pressure set by the safety protection system can be selected as required, and in some embodiments, the upper limit protection pressure set by the safety protection system is 40Mpa.
Supercritical/liquid CO 2 The fracturing fluid resistance reduction/sand carrying integrated evaluation device can be provided with a plurality of valves, a tee joint, a high-pressure resistant pipeline, a pressure gauge, a differential pressure gauge and other parts as required; each inlet or outlet can be in cross connection, and the pipeline is closed and opened by the arrangement of the pipeline and the valve, so that the utility model has no special requirement, and is not repeated; meanwhile, as can be understood by those skilled in the art, the utility model discloses an in the evaluation system, a plurality of communication interfaces can be set up in the system as required to realize the monitoring and transmission of data, for example, monitoring instrument devices such as flow meter, differential pressure gauge, viscometer in the system all have communication interfaces, for example, CO 2 The flowmeter is provided with a communication interface, the thickener metering device is provided with a communication interface, so that the computer can be networked, the type of the communication interface can be selected according to the requirement, including but not limited to an RS232 communication interface, and then the online control and analysis are carried out by using a software online analysis system, so that the man-machine separation intelligent operation in the test process is realized, and the safety is high.
The utility model provides a pair of supercritical/liquid CO 2 Fracturing fluid drag reduction/sand carrying integrationThe method of using the device was evaluated.
In one possible example, supercritical/liquid CO may be used as shown in FIG. 6 2 Taking a fracturing fluid drag reduction/sand carrying integrated evaluation device as an example, a simulation test is carried out, and the specific steps are as follows:
the gas storage cylinder 1 adopts conventional laboratory CO 2 Gas specification (bottle body pressure resistance 13MPa,40L, full load CO) 2 The pressure is 4-5 Mpa); a micromolecular oil-soluble thickener (such as methyl silicone oil) is added into the additive storage tank 9; the gas purifier 2 has a volume of 500mL, a pressure resistance of 20MPa and a material of Cr18Ni9Ti.
(1) And (3) device stability testing: adjusting the three-way electric ball valve 105 to open the pipeline of the shaft friction measuring system 102, opening the valves 201, 202, 205 and 208, closing the valves 203 and 204, and keeping the other unmarked valves in a closed state; the gas refrigerator 3 is turned on to prepare anhydrous CO 2 Setting liquid CO 2 Plunger pump 5 to predetermined displacement, and anhydrous CO 2 Pumping into a pipeline, controlling the pressure to be higher than the preset test pressure by 2-3 MPa through a first back pressure valve 301, and measuring the temperature stability without air leakage and pressure release of the well bore friction resistance measuring system 102 within 20-30 minutes; the first backpressure valve 301 is fully opened to reduce the pressure in the pipeline, the valve 205 is closed, the three-way electric ball valve 105 is adjusted to open the pipeline of the dynamic sand-carrying visualization system 103, the valves 203, 209, 210 and 211 are opened, and at the moment, the liquid CO is in liquid state 2 The plunger pump 5 pumps the anhydrous CO 2 Pumping into a pipeline of the dynamic sand-carrying visualization system 103, opening a heatable circulating water fluid infusion pump 16, balancing the internal and external pressure difference of the visualization fracture model through a pressure balance converter 17, controlling the pressure to be higher than the preset test pressure by 2-3 MPa through a second back pressure valve 302, and measuring the temperature stability of the dynamic sand-carrying visualization system 103 without air leakage and pressure release within 20-30 minutes; after the test is finished, the pressure is released through each emptying valve and each back pressure valve;
(2) And (3) measuring the friction resistance of the shaft: adjusting the three-way electric ball valve 105 to open the pipeline of the shaft friction measuring system 102, opening the valves 201, 202, 205 and 208, closing the valves 203 and 204, and keeping the other unmarked valves in a closed state; the gas refrigerator 3 is turned on to prepare anhydrous CO 2 Setting liquid CO 2 Plunger pump 5 to predetermined displacement, and anhydrous CO 2 Pumping into the pipeline, controlling the pressure to a preset test pressure through a first backpressure valve 301, opening the valve 204 and the liquid proportioning pump 8, and injecting the thickener into the anhydrous CO 2 If necessary, the temperature can be properly adjusted through the coil heater 6, when the complete dissolution of the thickening agent is observed to be one phase through the first high-pressure-resistant quartz glass window 7, the data of the differential pressure sensor 13 is acquired through the data acquisition system 104, and one-time shaft friction measurement is completed; observing anhydrous CO after being sheared by a shaft through a second high-pressure-resistant quartz glass window 12 2 Fracturing fluid conditions, testing repeatable if one phase is maintained, by adjusting the liquid CO 2 The discharge capacity of the plunger pump 5, the pipe diameter of the pipeline, the pressure and the like are repeated, and the liquid CO under various conditions can be obtained 2 Friction resistance of a fracturing fluid well barrel;
(3) Dynamic sand carrying visualization: the first backpressure valve 301 is fully opened to reduce the pressure in the pipeline, the valve 205 is closed, the three-way electric ball valve 105 is adjusted to open the pipeline of the dynamic sand-carrying visualization system 103, the camera 19 is started, the valves 203, 209, 210 and 211 are opened, and at the moment, the liquid CO is in liquid state 2 The plunger pump 5 pumps the anhydrous CO 2 Pumping into a pipeline of the dynamic sand-carrying visualization system 103, opening a heatable circulating water fluid infusion pump 16, balancing the internal and external pressure difference of the visualization fracture model through a pressure balance converter 17, and controlling the pressure to a preset test pressure through a second backpressure valve 302; the valve 204 and the liquid proportioning pump 8 are opened and the thickener is injected into the anhydrous CO 2 In the process, if necessary, the temperature can be properly adjusted through the coil heater 6, the first high-pressure-resistant quartz glass window 7 is used for observing that the thickening agent is completely dissolved into a phase and completely fills the crack model in the self-balancing pressure experiment chamber 15, the automatic sand adding device 14 is opened to start sand adding, and the camera 19 and the data acquisition and analysis system 104 are used for automatically recording the sand bank shape and the migration rule in the visible crack model under certain temperature, pressure, discharge capacity and sand ratio.
(4) Equipment cleaning: after the test is completed, the gas refrigerator 3 and the liquid CO are shut down 2 Opening all the valves and the backpressure valve to release pressure of all the pump bodies outside the plunger pump 5; adjusting the three-way electric ball valve 105 to open the pipeline of the shaft friction measurement system 102, opening the valves 205, 207 and 208, closing the valve 204, and passing through the waterless pipeline CO 2 Cleaning the test pipeline, and cleaning when no oil solvent is contained in the discharged gas; adjusting the three-way electric ball valve 105 to open the pipeline of the dynamic sand-carrying visualization system 103, closing the valves 203, 209, 211 and 210, opening the tenth valve 210 on the sand setting tank 18, and passing through the anhydrous CO 2 The testing pipeline is cleaned, when the tenth valve 210 on the grit tank 18 discharges no oily solvent in the gas, the testing pipeline is cleaned, the gas refrigerator 3 and the liquid CO2 plunger pump 5 are closed, the whole pipeline is decompressed to normal pressure, the grit tank 18 and a crack model in the self-balancing pressure experiment chamber 15 are disassembled, residual sand grains are cleaned by clear water, and the testing pipeline is placed, dried and then returned.
The utility model provides a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is provided with supercritical/liquid CO 2 The capability of internally matching and injecting the liquid thickening agent and the gaseous additive can effectively construct the supercritical/liquid CO of the prior whole system 2 A fracturing fluid; simultaneously to the technical defect that current evaluation device test function is single, temperature condition is single, withstand voltage is limited (especially current visual model), the utility model provides a supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device can automatically change a drag reduction/sand carrying test mode through an electric ball valve, and can complete the supercritical/liquid CO of the whole system at one time 2 Measuring friction resistance of a fracturing fluid well barrel and simulating dynamic sand carrying of a crack; meanwhile, the high-low temperature (-30-200 ℃) and high-pressure (60 MPa) conditions provided by the device can effectively simulate CO in the fracturing process 2 Phase state change; the utility model provides an in the visual system 103 of sand is taken to developments, effectively solved among the prior art visual plate glass and not resisted highly compressed shortcoming through the pressure balance converter to make this system can simulate CO 2 Dry fracturing site construction pressure at which anhydrous CO is evaluated 2 The sand-carrying performance of the fracturing fluid; and a digital plane coordinate real-time quantitative analysis proppant migration condition can be established through a data acquisition and analysis system, the drag reduction rate under different flow rates is continuously measured, a relation chart between the fracturing fluid flow rate and the drag reduction rate is automatically formed, the resistance reduction capability and the dynamic sand carrying capability of a system shaft can be completely evaluated,for anhydrous CO 2 The popularization of the fracturing technology in the oil and gas field development field has an important role.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.
Claims (10)
1. Supercritical/liquid CO 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized by comprising supercritical/liquid CO 2 A pumping system (101), a shaft friction measurement system (102), a dynamic sand-carrying visualization system (103) and a data acquisition and analysis system (104);
the shaft friction measurement system (102) and the dynamic sand-carrying visualization system (103) are connected in parallel to the supercritical/liquid CO through a three-way electric ball valve (105) 2 A pump injection system (101), the wellbore friction measurement system (102), a dynamic sand-carrying visualization system (103) and supercritical/liquid CO 2 And the pumping systems (101) are connected with the data acquisition and analysis system (104).
2. Supercritical/liquid CO according to claim 1 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that supercritical/liquid CO is used 2 The pump injection system comprises a gas storage bottle (1), a gas purifier (2), a gas refrigerator (3) and a CO resistant system 2 Flowmeter (4), liquid CO 2 The device comprises a plunger pump (5), a heater (6), a first high-pressure-resistant quartz glass window (7), a liquid proportioning pump (8), an additive storage tank (9), a first pressure sensor (10) and an automatic sand adding device (14);
the gas storage bottle (1) sequentially passes through the gas purifier (2), the gas refrigerator (3) and the CO resistance 2 A flow meter (4) for CO in liquid form 2 The inlet end of the plunger pump (5) is communicated,a first valve (201) is arranged between the gas storage bottle (1) and the gas purifier (2), and the gas refrigerator (3) is provided with a first pressure sensor (10);
the liquid CO 2 The outlet end of the plunger pump (5) is divided into two paths, one path is communicated with one end of the heater (6), and the liquid CO 2 A second valve (202) is arranged between the outlet end of the plunger pump (5) and one end of the heater (6); the automatic sand adding device (14) is provided with a pressurizing end and a sand adding end; the other path is communicated with the pressurizing end of the automatic sand adding device (14), and the liquid CO is 2 A third valve (203) is arranged between the outlet end of the plunger pump (5) and the pressurizing end of the automatic sand adding device (14); the sand adding end of the automatic sand adding device (14) is communicated with the dynamic sand carrying visualization system (103);
one end of the heater (6) is also communicated with the additive storage tank (9) through a liquid proportioning pump (8); a fourth valve (204) is arranged between the heater (6) and the liquid proportional pump (8);
the other end of the heater (6) is communicated with the three-way electric ball valve (105) through the first high-pressure-resistant quartz glass window (7);
the first pressure sensor (10) is CO-resistant 2 Flowmeter (4), liquid CO 2 The plunger pump (5), the heater (6), the liquid proportioning pump (8) and the automatic sand adding device (14) are electrically connected with the data acquisition and analysis system (104).
3. Supercritical/liquid CO according to claim 2 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that the liquid proportional pump (8) is a servo constant flow pump.
4. Supercritical/liquid CO according to claim 1 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that the shaft friction measurement system (102) comprises a simulation shaft (11), a second high-pressure-resistant quartz glass window (12), a differential pressure sensor (13) and a first back pressure valve (301);
the inlet end of the simulated shaft (11) is communicated with the three-way electric ball valve (105), and a fifth valve (205) is arranged between the simulated shaft (11) and the three-way electric ball valve (105); the outlet end of the simulated shaft (11) is sequentially communicated with the second high-pressure-resistant quartz glass window (12) and the first backpressure valve (301), and a sixth valve (206) is arranged between the second high-pressure-resistant quartz glass window (12) and the first backpressure valve (301);
the two ends of the differential pressure sensor (13) are respectively connected with the inlet end and the outlet end of the simulation shaft (11); a seventh valve (207) is arranged between the differential pressure sensor (13) and the inlet end of the simulated shaft (11), and an eighth valve (208) is arranged between the differential pressure sensor (13) and the outlet end of the simulated shaft (11);
the differential pressure sensor (13) and the first back pressure valve (301) are both electrically connected with the data acquisition and analysis system (104).
5. Supercritical/liquid CO according to claim 4 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that a plurality of simulation mineshafts (11), a plurality of second high-pressure-resistant quartz glass windows (12) and a plurality of differential pressure sensors (13) can be arranged, the outlet end of each simulation mineshaft (11) is communicated with one end of one second high-pressure-resistant quartz glass window (12), and the outlet ends of the simulation mineshafts (11) are connected to the three-way electric ball valve (105) in parallel; a valve is arranged between each simulated shaft (11) and the three-way electric ball valve (105); the other end of each second high-pressure-resistant quartz glass window (12) is connected with the first backpressure valve (301) in parallel, and a valve is arranged between each second high-pressure-resistant quartz glass window and the first backpressure valve (301); the two ends of each differential pressure sensor (13) are respectively connected with the inlet end and the outlet end of one simulated shaft (11), a valve is arranged between each differential pressure sensor (13) and the inlet end of the simulated shaft (11), and a valve is arranged between each differential pressure sensor (13) and the outlet end of the simulated shaft (11).
6. Supercritical/liquid CO according to claim 5 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in thatCharacterized in that the pipe diameters of the plurality of simulated wellbores (11) are different.
7. Supercritical/liquid CO according to claim 2 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that the dynamic sand carrying visualization system comprises a self-balancing pressure experiment chamber (15), a heatable circulating water liquid supplementing pump (16), a pressure balance converter (17), a sand setting tank (18) and a second back pressure valve (302);
a visual crack model is arranged in the self-balancing pressure experiment chamber (15), and the self-balancing pressure experiment chamber (15) is provided with an inlet, an outlet, a liquid supplementing port and a balancing port;
the inlet of the self-balancing pressure experiment chamber (15) is communicated with the three-way electric ball valve (105), the inlet of the self-balancing pressure experiment chamber (15) is also communicated with the sand adding end of the automatic sand adding device (14), and a ninth valve (209) is arranged between the inlet of the self-balancing pressure experiment chamber (15) and the sand adding end of the automatic sand adding device (14);
an outlet of the self-balancing pressure experiment chamber (15) is communicated with the second backpressure valve (302) through a grit tank (18), and a tenth valve (210) is arranged between the grit tank (18) and the second backpressure valve (302);
a liquid supplementing port of the self-balancing pressure experiment cabin (15) is communicated with a heatable circulating water liquid supplementing pump (16), and an eleventh valve (211) is arranged between the liquid supplementing port of the self-balancing pressure experiment cabin (15) and the heatable circulating water liquid supplementing pump (16);
a balance port of the self-balancing pressure experiment chamber (15) is communicated with one end of the pressure balance converter (17), and the other end of the pressure balance converter (17) is communicated with an inlet of the self-balancing pressure experiment chamber (15);
the second back pressure valve (302) is electrically connected with the data acquisition and analysis system (104).
8. Supercritical/liquid CO according to claim 7 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that a main body of the self-balancing pressure experiment chamber (15) is constructed into a cavity cylinder.
9. Supercritical/liquid CO according to claim 8 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that at least one window is arranged on the side wall of the self-balancing pressure experiment chamber (15), a camera (19) is arranged outside the window, and the camera (19) is electrically connected with the data acquisition and analysis system (104).
10. Supercritical/liquid CO according to claim 7 2 The fracturing fluid drag reduction/sand carrying integrated evaluation device is characterized in that a sand separation net is arranged in the sand setting tank (18).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117489317A (en) * | 2023-12-29 | 2024-02-02 | 克拉玛依市白碱滩区(克拉玛依高新区)石油工程现场(中试)实验室 | Mining site-level carbon dioxide fracturing fluid simulation experiment device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117489317A (en) * | 2023-12-29 | 2024-02-02 | 克拉玛依市白碱滩区(克拉玛依高新区)石油工程现场(中试)实验室 | Mining site-level carbon dioxide fracturing fluid simulation experiment device and method |
| CN117489317B (en) * | 2023-12-29 | 2024-03-22 | 克拉玛依市白碱滩区(克拉玛依高新区)石油工程现场(中试)实验室 | Mining site-level carbon dioxide fracturing fluid simulation experiment device and method |
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