CN106593411B - A kind of cement sheath sealing and the experimental provision and method of sleeve pipe lifting - Google Patents

Abstract

The invention provides an experimental device and method for cement sheath sealing performance and casing lifting. The experimental device for cement sheath tightness and casing lifting includes: kettle body, with multiple casings inside the kettle body, including: surface casing; intermediate casing located inside the surface casing and coaxially sleeved with the surface casing; The production casing located inside the intermediate casing and coaxial with the intermediate casing; also includes: cement slurry storage tank; heating rod, which is lowered into the inner cavity of the production casing; automatic confining pressure pump connected with the The confining pressure sensor between the confining pressure chamber and the automatic confining pressure pump; the internal pressure pump connected to the inner cavity of the production casing; the high-pressure gas source; the high-pressure gas source pressure sensor located between the high-pressure gas source and the kettle body; the inner cavity of the production casing 1. Temperature sensors are inserted in the first annular space and the second annular space; displacement sensors are connected to the production casing and the intermediate casing; gas flow meters. By implementing the invention, it is possible to simulate the effects of high temperature and high pressure on wellhead uplift and cement sheath sealing.

Description

An experimental device and method for cement sheath sealing and casing lifting

technical field

The invention relates to the field of oil and gas well engineering, in particular to an experimental device and method for cement sheath sealing and casing lifting.

Background technique

The high temperature and high pressure environment will lead to changes in the performance of the cement sheath, failure of the sealing, and excessive axial thermal stress of the casing will cause the wellhead to rise. At present, although some oil wells have obtained good logging evaluation after cementing operations, the wells will experience wellhead lift after high temperature and high pressure environment, oil and gas emission from the wellhead, and even interlayer channeling and other complicated situations. Therefore, the research on the sealing failure of cement sheath and the mechanism of wellhead uplift has good field application significance.

However, the current experimental equipment cannot fully simulate the effect of high temperature and high pressure environment on the casing string uplift and cement sheath sealing, and cannot provide a reliable theoretical basis for oilfield production risk analysis.

Contents of the invention

The main purpose of the embodiments of the present invention is to provide an experimental device for cement sheath sealing and casing lifting, which is used to simulate the effect of high temperature and high pressure environment on casing string lifting and cement sheath sealing. In order to achieve the above purpose, the embodiment of the present invention provides an experimental device for cement sheath sealing and casing lifting, including: a kettle body, a plurality of casing pipes inside the kettle body, including: the surface casing, and the joint between the holder shell The confining pressure chamber is formed between them; the middle casing is located inside the surface casing and is coaxially fitted with the surface casing, and forms a second annular space with the surface casing; it is located inside the middle casing and is coaxially fitted with the middle casing The production casing and the first annular space are formed with the intermediate casing; the experimental device for cement ring sealing and casing lifting also includes: a cement slurry storage tank, which is used to inject cement slurry into the first annular space and the second annular space ; The heating rod is lowered into the inner cavity of the production casing to heat the heating fluid to the set temperature; the automatic confining pressure pump connected to the confining pressure chamber is used to apply the set confining pressure to the surface casing; it is located between the confining pressure chamber and the The confining pressure sensor between the automatic confining pressure pumps is used to collect confining pressure data; the internal pressure pump connected to the inner cavity of the production casing applies the set internal pressure to the inner cavity of the production casing; the internal pressure sensor located inside the production casing, It is used to collect internal pressure data; the high-pressure gas source is used to input high-pressure gas into the first annular space and the second annular space; the high-pressure gas source pressure sensor located between the high-pressure gas source and the kettle body is used to collect high-pressure gas source pressure Data; temperature sensors are inserted in the inner cavity of the production casing, the first annulus and the second annulus to collect temperature data; displacement sensors are connected to the production casing and the intermediate casing to collect the production casing and the intermediate casing The displacement data of the tube; the gas flow meter is used to measure the gas flow of the first annulus and the second annulus respectively.

In one of the embodiments, it also includes: respectively connected with heating rod, automatic confining pressure pump, high-pressure gas source, internal pressure pump, internal pressure sensor, confining pressure sensor, high-pressure gas source pressure sensor, gas flow meter, multiple temperature The sensor and the computer connected with multiple displacement sensors are used to control the heating rod to heat the heating fluid, control the automatic confining pressure pump to apply the set confining pressure to the surface casing, and control the input of high-pressure air source to the first annulus and the second annulus High-pressure gas, control the internal pressure pump to apply the set internal pressure to the inner cavity of the production casing, collect the confining pressure data from the confining pressure sensor, the internal pressure data from the internal pressure sensor, the high-pressure gas source pressure data from the high-pressure gas source pressure sensor, Gas flow of the first annulus and the second annulus from the gas flow meter, a plurality of temperature data from the plurality of temperature sensors, and a plurality of displacement data of the production casing and the intermediate casing from the plurality of displacement sensors.

In one of the embodiments, it also includes: a cement slurry master control valve, the first end of which is connected to the cement slurry storage tank, and the second end is respectively connected to the second end of the high-pressure air source master control valve, the first end of the first control valve and the first end of the first control valve. The first end of the second control valve is connected; the high-pressure air source main control valve, the first end is connected with the high-pressure air source, and the second end is also respectively connected with the first end of the first control valve and the first end of the second control valve; The first end of the control valve is also connected to the first end of the second control valve, and the second end is connected to the first annulus; the second control valve, the second end is connected to the second annulus; the first control valve of the gas flow meter, The first end is connected to the first annular space, and the second end is respectively connected to the second end of the second control valve of the gas flow meter and the second end of the gas flow meter; the first end of the second control valve of the gas flow meter is connected to the second annular space, and the second end is connected to the second annular space. The two ends are also connected with the gas flow meter; the internal pressure pump control valve, the first end is connected with the internal pressure pump, and the second end is connected with the inner cavity of the production casing.

In one of the embodiments, it also includes: the kettle body includes an upper kettle cover and a lower kettle base; each of the upper kettle cover and the lower kettle base has a plurality of grooves opposite to each other for inserting the surface casing and the middle casing respectively. and production casing.

In one of the embodiments, it further includes: a plurality of sealing rings, used for sealing the plurality of grooves.

In one of the embodiments, it also includes: an upper flow channel located on the upper kettle cover; the upper flow channel is connected to a condensate pump, and the condensate pump is used to transport condensed water to cool the upper kettle cover; the condensate pump control valve, the first end of which is connected to the upper flow channel , the second end is connected to the condensate pump.

In one embodiment, the heating fluid is oil or water.

Because the experimental device of cement sheath sealing and casing lifting of the present invention injects cement slurry into the first annulus and the second annulus through the cement slurry storage tank to simulate the geological environment of the formation, and heats the heating fluid to the set temperature through the heating rod. The automatic confining pressure pump applies the set confining pressure to the surface casing, applies the set internal pressure to the inner cavity of the production casing through the internal pressure pump, inputs high-pressure gas into the first annular space and the second annular space through the high-pressure gas source, and passes the confining pressure Sensors, internal pressure sensors, high-pressure gas source pressure sensors, gas flow meters, temperature sensors and displacement sensors collect data to simulate the effects of high temperature and high pressure on wellhead uplift and cement sheath sealing.

The embodiment of the present invention also provides an experimental method for cement sheath sealing and casing uplift, which is used to simulate the effect of high temperature and high pressure environment on casing string uplift and cement sheath sealing, and provides a reliable theoretical basis for oil field production risk analysis .

In order to achieve the above object, the embodiment of the present invention provides an experimental method of the above-mentioned cement sheath sealing and casing lifting experimental device, including: injecting heating fluid into the inner cavity of the production casing, and injecting the cement slurry storage tank into the first annulus The cavity and the second annular space are filled with cement slurry; the heating rod heats the heating fluid to the set temperature; the automatic confining pressure pump applies the set confining pressure to the surface casing, and the internal pressure pump applies the set internal pressure to the inner cavity of the production casing; The first time to maintain the sealing performance of the cement sheath and the experimental device for casing uplift until the cement sheath cemented by cement slurry is cemented into a whole with the surface casing, intermediate casing and production casing; multiple displacement sensors collect Displacement data of production casing and intermediate casing; turn off the heating rod to lower the temperature of the heating fluid to normal temperature. During this process, multiple displacement sensors collect displacement data of production casing and intermediate casing, and multiple temperature sensors collect multiple Temperature data until the displacement data of the production casing and the intermediate casing remain unchanged; the high-pressure gas source inputs high-pressure gas into the first annular space and the second annular space; the high-pressure gas source pressure sensor collects the high-pressure gas source pressure data, and the gas flowmeter respectively Measure the gas flow data of the first annulus and the second annulus.

In one of the embodiments, it also includes: controlling the heating rod to heat the heating liquid, controlling the automatic confining pressure pump to apply a set confining pressure to the surface casing, controlling the internal pressure pump to apply a set internal pressure to the inner cavity of the production casing, and collecting data from The confining pressure data from the confining pressure sensor, the internal pressure data from the internal pressure sensor, the high-pressure gas source pressure data from the high-pressure gas source pressure sensor, the gas flow of the first annular space and the second annular space from the gas flow meter, and the Multiple temperature data from multiple temperature sensors, and displacement data from multiple displacement sensors for production casing and intermediate casing.

In one of the embodiments, it also includes: conveying condensed water to cool the upper lid of the kettle.

Because the experimental method of cement sheath sealing and casing lifting of the present invention injects heating fluid into the inner cavity of the production casing to simulate the fluid in the casing, and injects cement slurry into the first annulus and the second annulus to simulate the formation through the cement slurry storage tank Geological environment, heat the heating fluid to the set temperature through the heating rod, apply the set confining pressure to the surface casing through the automatic confining pressure pump, apply the set internal pressure to the inner cavity of the production casing through the internal pressure pump, and apply the set internal pressure to the inner cavity of the production casing through the high pressure gas source. The first annular space and the second annular space input high-pressure gas, and collect data through confining pressure sensors, internal pressure sensors, high-pressure gas source pressure sensors, gas flow meters, temperature sensors and displacement sensors, thereby simulating the wellhead uplift and cement sheath caused by high temperature and high pressure. According to the results of sealing effect, the change law of cement sheath sealing and wellhead uplift can be obtained, which provides a reliable theoretical basis for oilfield production risk analysis.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the structural diagram of the experiment device of cement sheath tightness and sleeve pipe lifting in the embodiment of the present invention;

Fig. 2 is a flow chart of the experimental method of cement sheath sealing and casing lifting in the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In view of the fact that the existing technology cannot fully simulate the effect of the high temperature and high pressure environment on the lifting of the casing string and the tightness of the cement sheath, the embodiment of the present invention provides an experimental device for the sealing of the cement sheath and the lifting of the casing. Inject cement slurry into the first annular space and the second annular space to simulate the geological environment of the formation, heat the heating fluid to the set temperature through the heating rod, apply the set confining pressure to the surface casing through the automatic confining pressure pump, and inject the set confining pressure into the production casing through the internal pressure pump. The set internal pressure is applied to the cavity, and the high-pressure gas is input into the first annular space and the second annular space through the high-pressure gas source, and the pressure sensor, the internal pressure sensor, the high-pressure gas source pressure sensor, the gas flow meter, the temperature sensor and the displacement sensor are used to control the pressure. Data collection, so as to simulate the effect of high temperature and high pressure on wellhead uplift and cement sheath sealing. The present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a structural diagram of an experimental device for cement sheath sealing and casing lifting in an embodiment of the present invention. As shown in Figure 1, the experimental device for the sealing performance of the cement sheath and the lifting of the casing includes: a kettle body, and there are multiple casings inside the kettle body, including: the surface casing 5, which forms a confining pressure chamber with the holder shell 39 2. The middle casing 27 located inside the surface casing 5 and coaxial with the surface casing 5 forms a second annular space 6 with the surface casing 5; located inside the middle casing 27 and coaxial with the middle casing 27 The production casing 29 with the shaft intertwined, and forms the first annulus 28 with the intermediate casing 27; Cement slurry is injected into the second annulus 6; the heating rod 19 is lowered into the inner cavity 30 of the production casing to heat the heating fluid to the set temperature; the automatic confining pressure pump 3 connected to the confining pressure chamber 2 is used to inject The casing 5 applies a set confining pressure; the confining pressure sensor 4 located between the confining pressure chamber 2 and the automatic confining pressure pump 3 is used to collect confining pressure data; the internal pressure pump 38 connected to the production casing inner chamber 30 supplies the production The inner cavity 30 of the casing applies a set internal pressure; the internal pressure sensor 18 located inside the production casing 29 is used to collect internal pressure data; the high-pressure gas source 11 is used to input high pressure to the first annular space 28 and the second annular space 6 Gas; the high-pressure gas source pressure sensor 14 located between the high-pressure gas source 11 and the kettle body is used to collect high-pressure gas source pressure data; the production casing inner cavity 30, the first annular space 28 and the second annular space 6 are all inserted with temperature The sensor 20 is used to collect temperature data; the production casing 29 and the intermediate casing 27 are connected with displacement sensors 16 for collecting the displacement data of the production casing 29 and the intermediate casing 27; the gas flow meter 31 is used to measure Gas flow in the first annulus 28 and the second annulus 6 .

During specific implementation, the kettle body can include an upper kettle cover 8 and a lower kettle seat 35, and the top of the upper kettle cover 8 is provided with a sealed shell cover for heat insulation. The upper kettle cover 8 and the lower kettle base 35 have multiple grooves opposite to each other for inserting the surface casing 5, the middle casing 27 and the production casing 29 respectively, wherein the grooves can be a plurality of different sizes. concentric circles. The experimental device for cement sheath tightness and casing lifting may also include multiple sealing rings for sealing multiple grooves.

In the embodiment, the cement slurry storage tank 10, the high-pressure gas source 11, the internal pressure pump 38 and the automatic confining pressure pump 3 can all be connected to the kettle body through an input manifold. The cement slurry storage tank 10 injects a certain volume of cement slurry into the first annular space 28 and the second annular space 6 through the liquid injection holes 7 and 17 to simulate the formation geological environment. Wherein, the ratio of the components of the cement slurry can be adjusted arbitrarily according to the needs of the experiment. The heating rod 9 can heat the heating liquid to a set temperature by means of electric heating, so that the heat can be transferred outward, simulating the temperature environment of the high-temperature fluid and the well. Wherein, the heating fluid can be oil or water. The automatic confining pressure pump 3 applies a set confining pressure to the surface casing 5 to simulate the formation confining pressure. The high-pressure gas source 11 supplies high-pressure gas to the first annular space 28 and the second annular space 6. The production casing lumen 30 applies a set internal pressure to simulate the pressure environment in the well. Confining pressure sensor 4, internal pressure sensor 18, high-pressure gas source pressure sensor 14, gas flow meter 31 and temperature sensor 20 inside each casing are used for data collection, and according to the change of data, the effect of high temperature and high pressure on wellhead uplift and cement sheath sealing is simulated affect the result.

As shown in Figure 1, the experimental device for cement sheath tightness and casing lifting can also include: respectively with heating rod 19, automatic confining pressure pump 3, internal pressure sensor 18, high pressure air source 11, internal pressure pump 38, confining pressure Sensor 4, high-pressure gas source pressure sensor 14, gas flow meter 31, multiple temperature sensors 20, and a computer 1 connected to multiple displacement sensors 16 are used to control the heating rod 19 to heat the heating liquid and control the automatic confining pressure pump 3 to the surface layer The casing 5 applies a set confining pressure, controls the high-pressure gas source 11 to input high-pressure gas into the first annular space 28 and the second annulus 6, controls the internal pressure pump 38 to apply a set internal pressure to the inner cavity 30 of the production casing, and collects gas from the surrounding environment. The confining pressure data from the pressure sensor 4, the internal pressure data from the internal pressure sensor 18, the high-pressure gas source pressure data from the high-pressure gas source pressure sensor 14, the first annular space 28 and the second annular space 6 from the gas flow meter 31 Gas flow rate, multiple temperature data from multiple temperature sensors 20 , and displacement data of production casing 29 and intermediate casing 27 from multiple displacement sensors 16 . Computer 1 can control and monitor the changes of relevant parameters through programming software, and simulate the effects of high temperature and high pressure on wellhead uplift and cement sheath sealing. Heating rod 19, automatic confining pressure pump 3, high-pressure gas source 11, internal pressure pump 38, confining pressure sensor 4, internal pressure sensor 18, compressed gas source pressure sensor 14, gas flow meter 31, multiple temperature sensors 20, and multiple Each displacement sensor 16 can be connected with the computer 1 through the data collection line, also can be connected with the computer 1 through wireless communication equipments such as bluetooth, GPRS.

In the embodiment, the experimental device for cement sheath tightness and casing lifting may also include: a cement slurry master control valve 12, the first end of which is connected to the cement slurry storage tank 10, and the second end is respectively connected to the high-pressure air source master control valve 13 and the second end. Two ends, the first end of the first control valve 15 is connected with the first end of the second control valve 9; the high-pressure air source master control valve 13, the first end is connected with the high-pressure air source 11, and the second end is also connected with the first control valve respectively 15, the first end is connected to the first end of the second control valve 9; the first end of the first control valve 15 is also connected to the first end of the second control valve 9, and the second end is connected to the first annulus 28; the second control valve Valve 9, the second end is connected to the second annulus 6; the first control valve 32 of the gas flow meter is connected to the first annulus 28, and the second end is respectively connected to the second end of the second control valve 33 of the gas flow meter It is connected with the gas flowmeter 31; the second control valve 33 of the gas flowmeter, the first end is connected with the second annular space 6, and the second end is also connected with the gas flowmeter 31; the internal pressure pump control valve 36, the first end is connected with the inner The pressure pump 38 is connected, and the second end is connected with the inner cavity 30 of the production casing.

During specific implementation, the opening and closing of the above-mentioned valves can also be controlled by the computer 1, so as to control the high-pressure gas source 11 to input high-pressure gas to the first annular space 28 and the second annular space 6, and to control the automatic confining pressure pump 3 to the surface casing 5. The set confining pressure is applied, and the internal pressure pump 38 is controlled to apply the set internal pressure to the inner chamber 30 of the production casing.

As shown in Figure 1, the experimental device of cement sheath tightness and sleeve pipe lifting can also include: an upper flow passage 22 positioned at the upper kettle cover 8; Kettle cover 8; condensate pump control valve 25, the first end is connected to the upper flow channel 22, and the second end is connected to the condensate pump 26. By cooling the condensate pump 26 of the still body, it is possible to prevent the failure of the O-ring due to excessive temperature of the still body.

To sum up, the experimental device of cement sheath sealing and casing lifting of the present invention injects cement slurry into the first annulus and the second annulus through the cement slurry storage tank to simulate the geological environment of the formation, and heats the heating fluid to the set temperature through the heating rod , apply the set confining pressure to the surface casing through the automatic confining pressure pump, apply the set internal pressure to the inner cavity of the production casing through the internal pressure pump, input high-pressure gas into the first annular space and the second annular space through the high-pressure gas source, and pass Confining pressure sensor, internal pressure sensor, high pressure gas source pressure sensor, gas flow meter, temperature sensor and displacement sensor are used for data collection, so as to simulate the effect of high temperature and high pressure on wellhead uplift and cement sheath sealing. The embodiment of the present invention can also monitor the changes of relevant parameters by computer, simulate the effect of high temperature and high pressure on the wellhead uplift and the sealing performance of the cement sheath, and cool the kettle body through a condensate pump to prevent the failure of the O-ring due to excessive temperature in the kettle.

Based on the same inventive concept, the embodiment of the present invention also provides an experimental method for cement sheath sealing and casing lifting, as described in the following embodiments. Since the principle of this method to solve the problem is similar to the experimental device of cement sheath sealing and casing lifting, the implementation of this method can refer to the experimental device of cement sheath sealing and casing lifting, and the repetition will not be repeated.

Fig. 2 is a flow chart of the experimental method of cement sheath sealing and casing lifting in the embodiment of the present invention. As shown in Figure 2, the method may include:

Step 101: inject heating liquid into the inner cavity 30 of the production casing, fill the first annular space 28 and the second annular space 6 with cement slurry in the cement slurry storage tank 10, and heat the heating liquid to a set temperature with the heating rod 19;

Step 102: the automatic confining pressure pump 3 applies a set confining pressure to the surface casing 5, and the internal pressure pump 38 applies a set internal pressure to the inner cavity 30 of the production casing;

Step 103: Set the first time for maintaining the sealing performance of the cement sheath and the casing lifting experimental device until the cement sheath cemented by the cement slurry is cemented with the surface casing 5, the intermediate casing 27 and the production casing 29 to form a single overall;

Step 104: Multiple displacement sensors 16 collect displacement data of the production casing 29 and the intermediate casing 27;

Step 105: Turn off the heating rod 9 to lower the temperature of the heating fluid to normal temperature. During this process, multiple displacement sensors 16 collect the displacement data of the production sleeve 29 and the intermediate sleeve 27, and multiple temperature sensors 20 collect multiple temperature data. Until the displacement data of production casing 29 and intermediate casing 27 remain unchanged;

Step 106: The high-pressure gas source 11 supplies high-pressure gas to the first annular space 28 and the second annular space 6;

Step 107: The high-pressure gas source pressure sensor 14 collects the high-pressure gas source pressure data, and the gas flow meter 31 measures the gas flow data of the first annular space 28 and the second annular space 6 respectively.

During specific implementation, step 101 may include: sealing the groove with an O-shaped sealing rubber ring, inserting the production sleeve 29, the intermediate sleeve 27 and the simulated formation 5 into the groove corresponding to the lower kettle base 35, and cooperating with the upper kettle cover 8 for assembly . A heating liquid is injected into the inner cavity 30 of the casing, and the heating liquid may be water or oil. Put heating rod 19 down from the center of last kettle cover 8, fix and seal. Cement slurry is configured in the slurry storage tank 10 according to a certain ratio. Wherein, the ratio of the components of the cement slurry can be adjusted arbitrarily according to the needs of the experiment. Open the cement slurry master control valve 12, the first control valve 15 and the second control valve 9, inject the configured cement slurry into the first annular space 28 and the second annular space 6 through the cement slurry storage tank 10, wait for the cement slurry to flow from the Show that the cement slurry has been filled when overflowing in the liquid storage overflow pipeline, close the total control valve 12 of the cement slurry.

During specific implementation, the heating rod 19 is heated until the temperature data of the temperature sensor 20 in the production casing 29 can be 122°C to simulate the formation temperature; the automatic confining pressure pump 3 can apply a confining pressure of 60Mpa to the surface casing 5; open The internal pressure pump control valve 36 enables the internal pressure pump 38 to apply a set internal pressure to the inner chamber 30 of the production casing. Through steps 105 and 106, the result of the influence of high temperature and high pressure on wellhead uplift is obtained.

During specific implementation, step 107 may include: first opening the high-pressure gas source main control valve 13 and the first control valve 32 of the gas flow meter, and recording the gas flow of the first annular space 28 at this time through the gas flow meter 31 . Then close the first control valve 32 of the gas flow meter, open the second control valve 33 of the gas flow meter, and record the gas flow of the second annular space 6 at this time through the gas flow meter 31 . Through step 107, the result of the effect of high temperature and high pressure on the sealing performance of the cement sheath is obtained.

The method may also include: after performing step 101-step 108, continuing to perform step 201-step 205:

Step 201: The computer 1 controls the heating rod 9 to heat the heating liquid to a set temperature, and then continues heating for a second set time.

Step 202: Turn off the heating rod 9 to lower the temperature of the heating fluid to normal temperature. During this process, multiple displacement sensors 16 collect displacement data of the production casing 29 and intermediate casing 27, and multiple temperature sensors 20 collect multiple temperature data. Until the displacement data of production casing 29 and intermediate casing 27 remain unchanged;

Step 203: the high-pressure gas source 11 supplies high-pressure gas to the first annular space 28 and the second annular space 6;

Step 204: The high-pressure gas source pressure sensor 14 collects high-pressure gas source pressure data, and the gas flow meter 31 measures the gas flow data of the first annular space 28 and the second annular space 6 respectively.

Step 205: Repeat step 201-step 204 until the gas flow data of the first annulus 28, the gas flow data of the second annulus 6, the displacement data of the production casing 29 and the displacement data of the intermediate casing 27 no longer change .

When the gas flow data of the first annulus 28, the gas flow data of the second annulus 6, the displacement data of the production casing 29 and the displacement data of the intermediate casing 27 no longer change, it indicates that the cement sheath has completely separated from the surface casing. Pipe 5, intermediate casing 27 and production casing 29, the cement sheath seal fails.

Through steps 201 to 205, multiple sets of gas flow data of the first annulus 28 , gas flow data of the second annulus 6 , displacement data of the production casing 29 and displacement data of the intermediate casing 27 can be obtained. By analyzing and comparing the above multiple sets of data, the effect of steam huff and puff on wellhead uplift and cement sheath sealing can be obtained, and the change law of cement sheath tightness and wellhead uplift can be obtained.

In the embodiment, the experimental method of the experimental device of cement sheath tightness and casing lifting may also include: controlling the heating rod 19 to heat the heating fluid, controlling the automatic confining pressure pump 3 to apply a set confining pressure to the surface casing 5, and controlling the internal pressure The pump 38 applies a set internal pressure to the inner chamber 30 of the production casing, and collects the confining pressure data from the confining pressure sensor 4, the internal pressure data from the internal pressure sensor 18, the high-pressure gas source pressure data from the high-pressure gas source pressure sensor 14, and the The gas flow rate of the first annulus 28 and the second annulus 6 of the gas flowmeter 31, the multiple temperature data from multiple temperature sensors 20, and the production casing 29 and intermediate casing 27 from multiple displacement sensors 16 displacement data. During specific implementation, the application software of the computer 1 may be used to execute the above functions. The application software can be programmed with Visual Basic6.0. After the experiment is completed, the computer 1 can directly output the data report.

In the embodiment, the experimental method of the experimental device of cement sheath tightness and casing lifting may also include: cooling the upper kettle cover 8 by sending condensed water.

Main technical indicators of the present invention are as follows:

1) Experimental temperature: room temperature -220°C;

2) Internal pressure: 0-15Mpa;

3) Confining pressure: 0-60Mpa;

4) Production casing size: 7 inches, wall thickness 8.05mm, length 500mm;

6) Intermediate casing size: 9.625 inches, wall thickness 9.19mm, length 500mm;

7) Surface casing size: 13.375 inches, wall thickness 12.09mm, length 500mm;

8) Pressure sensor: the measuring range of annular fluid pressure sensor, confining pressure sensor and high-pressure air source pressure sensor is 70MPa, and the measuring range of internal pressure sensor is 20MPa; the sensor sensitivity is 0.27% FS;

9) Surface roughness of casing: 0.2.

Wherein, the normal temperature may be 25°C.

To sum up, the experimental method of cement sheath tightness and casing lifting of the present invention injects heating fluid into the inner cavity of the production casing to simulate the fluid in the casing, and injects cement slurry into the first annulus and the second annulus through the cement slurry storage tank Simulate the geological environment of the formation, heat the heating fluid to the set temperature through the heating rod, apply the set confining pressure to the surface casing through the automatic confining pressure pump, apply the set internal pressure to the inner cavity of the production casing through the internal pressure pump, and pass the high pressure gas source Input high-pressure gas into the first annular space and the second annular space, and collect data through confining pressure sensors, internal pressure sensors, high-pressure gas source pressure sensors, gas flow meters, temperature sensors and displacement sensors, thereby simulating the effect of high temperature and high pressure on wellhead uplift and Based on the results of the influence of the cement sheath on the tightness of the cement sheath, the change law of the cement sheath tightness and wellhead uplift can be obtained, which provides a reliable theoretical basis for the risk analysis of oilfield production.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (10)

1. a kind of cement sheath sealing and the experimental provision of sleeve pipe lifting, it is characterised in that including：

Kettle, there are multiple sleeve pipes inside kettle, including：

Confined pressure chamber (2) is formed between surface pipe (5), with clamper shell (39)；

Positioned at surface pipe (5) is internal, the intermediate casing (27) that is coaxially nested with surface pipe (5), and with surface pipe (5) shape Into the second annular space (6)；

Positioned at intermediate casing (27) inside, the production casing (29) being coaxially nested with intermediate casing (27), and and intermediate casing (27) the first annular space (28) is formed；

Cement sheath sealing and the experimental provision of sleeve pipe lifting also include：

Cement mortar holding vessel (10), for injecting cement mortar to the first annular space (28) and the second annular space (6)；

Heating rod (19), production casing inner chamber (30) is lowered into, for heating heating liquid to design temperature；

The automatic confined pressure pump (3) being connected with confined pressure chamber (2), for applying setting confined pressure to surface pipe (5)；

Confined pressure sensor (4) between confined pressure chamber (2) and automatic confined pressure pump (3), for gathering confined pressure data；

The interior press pump (38) being connected with production casing inner chamber (30), apply setting internal pressure to production casing inner chamber (30)；

The interior pressure sensor (18) internal positioned at production casing (29), for gathering internal pressure data；

High-pressure air source (11), for inputting gases at high pressure to the first annular space (28) and the second annular space (6)；

Positioned at high-pressure air source pressure sensor (14) of the high-pressure air source (11) between kettle, for gathering high-pressure air source number pressure According to；

Production casing inner chamber (30), the first annular space (28) and the second annular space (6) are inserted with temperature sensor (20), for gathering temperature Degrees of data；

Be all connected with displacement transducer (16) on production casing (29) and intermediate casing (27), for gather production casing (29) and in Between sleeve pipe (27) displacement data；

Gas flowmeter (31), for measuring the gas flow of the first annular space (28) and the second annular space (6) respectively.

2. cement sheath sealing according to claim 1 and the experimental provision of sleeve pipe lifting, it is characterised in that also include：

Respectively with heating rod (19), automatic confined pressure pump (3), high-pressure air source (11), interior press pump (38), interior pressure sensor (18), enclose Pressure sensor (4), high-pressure air source pressure sensor (14), gas flowmeter (31), multiple temperature sensors (20) and multiple The computer (1) of displacement transducer (16) connection, for controlling heating rod (19) heating heating liquid, the automatic confined pressure pump (3) of control Apply setting confined pressure to surface pipe (5), control high-pressure air source (11) inputs high pressure to the first annular space (28) and the second annular space (6) Gas, press pump (38) applies setting internal pressure, confined pressure of the collection from confined pressure sensor (4) to production casing inner chamber (30) in control Data, the internal pressure data from interior pressure sensor (18), the high-pressure air source number pressure from high-pressure air source pressure sensor (14) According to, the first annular space (28) from gas flowmeter (31) with the gas flow of the second annular space (6), from multiple temperature sensors (20) multiple temperature datas and the production casing from multiple displacement transducers (16) (29) and intermediate casing (27) it is more Individual displacement data.

3. cement sheath sealing according to claim 1 and the experimental provision of sleeve pipe lifting, it is characterised in that also include：

Cement mortar master control valve (12), first end are connected with cement mortar holding vessel (10), the second end respectively with high-pressure air source master control The end of valve (13) second processed, the first control valve (15) first end connect with the second control valve (9) first end；

High-pressure air source master control valve (13), first end are connected with high-pressure air source (11), the second end also respectively with the first control valve (15) first end connects with the second control valve (9) first end；

First control valve (15), first end are also connected with the second control valve (9) first end, and the second end connects with the first annular space (28) Connect；

Second control valve (9), the second end are connected with the second annular space (6)；

The control valve of gas flowmeter first (32), first end are connected with the first annular space (28), the second end respectively with gas flowmeter The end and gas flow meter (31) of second control valve (33) second connects；

The control valve of gas flowmeter second (33), first end are connected with the second annular space (6), the second end also with gas flowmeter (31) Connection；

Internal pressure pump control valve (36), first end are connected with interior press pump (38), and the second end is connected with production casing inner chamber (30).

4. cement sheath sealing according to claim 1 and the experimental provision of sleeve pipe lifting, it is characterised in that also include：

Kettle includes upper kettle cover (8) and lower kettle seat (35)；

Have multiple grooves facing each other on upper kettle cover (8) and lower kettle seat (35), for insert respectively surface pipe (5), in Between sleeve pipe (27) and production casing (29).

5. cement sheath sealing according to claim 4 and the experimental provision of sleeve pipe lifting, it is characterised in that also include：

Multiple sealing rings, for sealing multiple grooves.

6. cement sheath sealing according to claim 4 and the experimental provision of sleeve pipe lifting, it is characterised in that also include：

Upper runner (22) positioned at upper kettle cover (8)；

Upper runner (22) is connected with condenser pump (26), and condenser pump (26) is used to convey kettle cover (8) in condensation water cooling；

Pump control valve (25) is condensed, first end is connected with upper runner (22), and the second end is connected with condenser pump (26).

7. cement sheath sealing according to claim 1 and the experimental provision of sleeve pipe lifting, it is characterised in that heating liquid is Oil or water.

8. the experimental method of a kind of any cement sheath sealing of claim 1-7 and the experimental provision of sleeve pipe lifting, it is special Sign is, including：

To production casing inner chamber (30) injection heating liquid, cement mortar holding vessel (10) is to the first annular space (28) and the second annular space (6) Fill cement mortar；

Heating rod (19) heating heats liquid to design temperature；

Automatic confined pressure pump (3) applies setting confined pressure to surface pipe (5), and interior press pump (38) applies to production casing inner chamber (30) to be set Determine internal pressure；

The very first time of setting maintenance cement sheath sealing and the experimental provision of sleeve pipe lifting, until the cement that cement mortar is cemented to Ring is cemented to an entirety with surface pipe (5), intermediate casing (27) and production casing (29)；

Multiple displacement transducer (16) collection production casings (29) and the displacement data of intermediate casing (27)；

Close heating rod (9) order heating liquid temperature degree and be down to normal temperature, in the process, multiple displacement transducer (16) collection production sets Displacement data, the multiple temperature datas of multiple temperature sensors (20) collection of (29) and intermediate casing (27) are managed, until production set The displacement data for managing (29) and intermediate casing (27) is constant；

High-pressure air source (11) inputs gases at high pressure to the first annular space (28) and the second annular space (6)；

High-pressure air source pressure sensor (14) gathers high-pressure air source pressure data, and gas flowmeter (31) measures the first annular space respectively (28) with the gas flow data of the second annular space (6).

9. the experimental method of cement sheath sealing according to claim 8 and the experimental provision of sleeve pipe lifting, its feature exist In, in addition to：

Heating rod (19) heating heating liquid, the automatic confined pressure pump (3) of control is controlled to apply setting confined pressure, control to surface pipe (5) Interior press pump (38) applies setting internal pressure to production casing inner chamber (30), confined pressure data of the collection from confined pressure sensor (4), comes from The internal pressure data of interior pressure sensor (18), the high-pressure air source pressure data from high-pressure air source pressure sensor (14), from gas The first annular space (28) of flowmeter body (31) and the gas flow of the second annular space (6), from the more of multiple temperature sensors (20) Individual temperature data and production casing (29) and the displacement data of intermediate casing (27) from multiple displacement transducers (16).

10. the experimental method of cement sheath sealing according to claim 8 and the experimental provision of sleeve pipe lifting, its feature exist In, in addition to：

Kettle cover (8) in conveying condensation water cooling.