CN110320136B - Device and method for measuring effective porosity of shale core - Google Patents
Device and method for measuring effective porosity of shale core Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 82
- 239000007924 injection Substances 0.000 claims abstract description 82
- 239000011435 rock Substances 0.000 claims abstract description 71
- 239000012530 fluid Substances 0.000 claims description 50
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000003556 assay Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 14
- 239000003208 petroleum Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 238000001802 infusion Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000003079 shale oil Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a device and a method for measuring effective porosity of a shale core. The measuring apparatus includes: the device comprises a vacuumizing unit, a rock core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit; one end of the rock core holder is connected with the vacuumizing unit, and the other end of the rock core holder is connected with the middle container; the confining pressure unit is connected to the core holder; the other end of the intermediate container is connected with the injection unit; the control acquisition unit is connected to the injection unit and is used for acquiring data of the injection unit. The advantages are that: the measuring device has simple structure, is convenient for real-time assembly, has simple and accurate measuring method and can nondestructively measure the effective porosity of the rock sample under the condition of the oil-gas reservoir.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a device and a method for measuring effective porosity of a shale core.
Background
In the technical field of oil and gas field development, the porosity reflects the storage capacity of a porous medium for fluid, is one of important parameters for reservoir physical property research, and can be applied to oil and gas reservoir evaluation and reserve calculation. Shale oil and gas exploration and development become world hotspots, China has abundant unconventional shale oil and gas reserves, and the potential of recoverable resources is in the top of the world. Along with the rapid development of shale oil and gas, the accurate measurement of the porosity of the shale, particularly the determination of the porosity of rocks under the actual oil and gas reservoir condition, has important significance for the exploration, development and evaluation of the shale oil and gas.
At present, methods for testing the porosity of indoor shale mainly comprise a helium method, a nitrogen adsorption method, a scanning electron microscope method, a mercury intrusion method, a saturated fluid method and a low-field nuclear magnetic resonance method. The helium method adopts a helium porosimeter, a measuring device of the helium porosimeter is a sample cup with a fixed volume, a rock core is arranged in a container, and the device cannot apply overburden pressure to the rock and has a large difference with the oil-gas reservoir condition; the nitrogen adsorption method comprises the steps of putting a crushed sample into a cavity container, and calculating the porosity of the sample by measuring the gas adsorption quantity, wherein the device can not apply overburden pressure on the rock in the sample, and the total porosity of the sample is measured and comprises non-communicated pore space; the mercury pressing method adopts a mercury pressing instrument, and rocks are placed in a sample tube and cannot apply overlying pressure to a rock sample; the conventional saturated fluid method is to saturate a rock core in a filter flask, measure the rock saturation by weighing through a balance under normal pressure and cannot reflect the porosity of the rock under the condition of an oil-gas reservoir; the scanning electron microscope method is to quantitatively calculate the porosity of the rock by focusing an ion beam scanning electron microscope, and the measured porosity is the porosity of a local area, so that the porosity of the shale rock is difficult to measure on the whole; the low-field nuclear magnetic resonance method is to use a nuclear magnetic instrument to determine the porosity of rock, and the measured parameters are echo time and waiting time, which are based on the measured parameters of a conventional reservoir, so that the measured porosity is not the true value of the porosity of shale.
Therefore, it is necessary to develop a device and a method for measuring the effective porosity of the shale core, which can nondestructively and accurately measure the effective porosity of the rock sample under the oil and gas reservoir condition.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a device and a method for measuring the effective porosity of a shale core, which can be used for nondestructively and accurately measuring the effective porosity of a rock sample under an oil-gas reservoir condition through a measuring device.
According to an aspect of the present invention, there is provided an apparatus for determining effective porosity of a shale core, the apparatus comprising: the device comprises a vacuumizing unit, a rock core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit;
one end of the rock core holder is connected with the vacuumizing unit, and the other end of the rock core holder is connected with the middle container;
the confining pressure unit is connected to the core holder;
the other end of the intermediate container is connected with the injection unit;
the control acquisition unit is connected to the injection unit and used for acquiring data of the injection unit.
Preferably, the assay device further comprises:
the first two-way valve is arranged between the rock core holder and the vacuumizing unit;
the second two-way valve is arranged between the rock core holder and the confining pressure unit;
a third two-way valve disposed between the core holder and the intermediate container, proximate to the core holder;
and the fourth two-way valve is arranged between the rock core holder and the intermediate container and is close to the intermediate container.
Preferably, the injection unit is an injection pump.
Preferably, the precision of the infusion pump is not less than 0.005 mL.
Preferably, the control acquisition unit is a desktop computer, a notebook computer or a tablet computer.
According to another aspect of the invention, a method for determining the effective porosity of a shale core is provided, and the method comprises the following steps:
placing a core to be tested in a core holder, applying confining pressure to the core holder, and vacuumizing the core to be tested;
boosting the pressure of the fluid in the intermediate container to an experimental pressure through an injection unit, and obtaining the compression coefficient of the fluid;
gradually saturating the core to be measured for multiple times, and recording the volume of the fluid entering the core to be measured through a control acquisition unit;
and acquiring the porosity of the core to be measured based on the volume of the entered fluid, the cavity volume of the measuring device and the volume change of the entered fluid after compression.
Preferably, the step-by-step saturation of the core to be tested for multiple times includes:
under the atmospheric pressure condition, pushing the fluid in the intermediate container to be injected into the core to be detected through the injection unit, so that the core to be detected is saturated;
increasing the injection pressure and the confining pressure to saturate the rock core to be detected;
and repeating the steps, and recording the volume of the fluid entering the core to be tested when the injection pressure reaches the formation pressure and the confining pressure reaches the overburden pressure.
Preferably, the core to be tested is pretreated before being placed into the core holder.
Preferably, the pretreatment of the core to be tested comprises:
placing the core to be tested in a constant temperature box for drying, taking out the core after drying to constant weight, and placing the core in a dryer for cooling;
measuring the diameter and the length of the core to be measured;
measuring the cavity volume of the assay device;
and placing the pretreated core to be detected in the core holder.
Preferably, the cavity volume of the measuring device comprises the dead volume of the core holder, the volume of the connecting pipeline and the volume of each two-way valve.
According to the device and the method for measuring the effective porosity of the shale core, the advantages are that: the measuring device has simple structure, is convenient for real-time assembly, has simple and accurate measuring method and can nondestructively measure the effective porosity of the rock sample under the condition of the oil-gas reservoir.
The apparatus and method of the present invention have other features and advantages which will be set forth in detail in the accompanying drawings and the following detailed description which are incorporated herein and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 is a schematic diagram illustrating an apparatus for determining effective porosity of a shale core according to an exemplary embodiment of the present invention.
Fig. 2 is a flow chart illustrating steps of a method for determining the effective porosity of a shale core according to an exemplary embodiment of the present invention.
Description of reference numerals:
1. a vacuum pumping unit; 2. a first two-way valve; 3. a core holder; 4. a second two-way valve; 5. a confining pressure unit; 6. a third two-way valve; 7. a fourth two-way valve; 8. an intermediate container; 9. an injection unit; 10. and controlling the acquisition unit.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a device for measuring the effective porosity of a shale core, which comprises: the device comprises a vacuumizing unit, a rock core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit;
one end of the rock core holder is connected with the vacuumizing unit, and the other end of the rock core holder is connected with the middle container;
the confining pressure unit is connected to the core holder;
the other end of the intermediate container is connected with the injection unit;
the control acquisition unit is connected to the injection unit and is used for acquiring data of the injection unit.
The measuring device is characterized in that the vacuumizing unit, the rock core holder, the middle container and the injection unit are sequentially connected, further, the confining pressure unit is connected to the rock core holder and used for applying confining pressure on a rock core to be measured, and the injection unit is connected with the control acquisition unit and used for recording the volume change of the injection unit.
Preferably, the measuring apparatus further comprises:
the first two-way valve is arranged between the rock core holder and the vacuumizing unit;
the second two-way valve is arranged between the rock core holder and the confining pressure unit;
the third two-way valve is arranged between the rock core holder and the middle container and is close to the rock core holder;
and the fourth two-way valve is arranged between the rock core holder and the middle container and is close to the middle container.
And (3) vacuumizing the measuring device by opening the first two-way valve, closing the third two-way valve, closing the first two-way valve after vacuumizing, opening the third two-way valve and the fourth two-way valve, injecting the fluid in the middle container into the rock core to be measured through the injection unit, saturating the rock core to be measured, and applying confining pressure to the rock core to be measured by opening the second two-way valve.
Preferably, the injection unit is an injection pump.
The infusion pump may be selected from a Quizix infusion pump, but is not limited thereto, and may be any infusion pump that can be conceived by those skilled in the art.
Preferably, the precision of the injection pump is not less than 0.005 mL.
Wherein, the control acquisition unit is a desktop computer, a notebook computer or a tablet computer.
The measuring device of the invention has simple structure and is convenient for real-time assembly.
The invention also provides a method for measuring the effective porosity of the shale core, which comprises the following steps:
placing a core to be tested in a core holder, applying confining pressure to the core holder, and vacuumizing the core to be tested;
boosting the pressure of the fluid in the intermediate container to an experimental pressure through the injection unit, and obtaining the compression coefficient of the fluid;
the core to be measured is saturated step by step for multiple times, and the volume of fluid entering the core to be measured is recorded through the control acquisition unit;
and acquiring the porosity of the core to be measured based on the volume of the entering fluid, the cavity volume of the measuring device and the volume change of the entering fluid after compression.
The compression coefficient is used for calculating the volume change of the fluid along with the pressure change, so that the error influence of the compressibility of the fluid on the experimental result is eliminated.
The change of the volume of the injection unit before and after saturation comprises the volume of fluid entering the core to be measured, the cavity volume of the measuring device and the volume change of fluid in the intermediate container due to compressibility, so that the volume of the cavity of the measuring device subtracted from the injection volume of the injection unit and then subtracted from the volume generated by compression of the fluid in the intermediate container is the volume of the fluid entering the core to be measured, and the effective porosity is obtained by dividing the volume of the fluid of the core to be measured by the volume of the framework of the core to be measured.
Specifically, after a core to be measured is placed in a core holder, the tightness of the measuring device is checked, confining pressure of 2.5MPa is applied to the core to be measured in the core holder through a confining pressure unit, the core to be measured is vacuumized for 48 hours by opening the first two-way valve and closing the third two-way valve, wherein, fluid is placed in the intermediate container, the intermediate container filled with the fluid is pressurized through the injection unit, when the pressure is increased to the pressure required by the experiment, the volume change of the injection unit is recorded through controlling the acquisition unit, further calculating the compression coefficient of the fluid, gradually saturating the core to be measured for many times, recording the volume of the fluid entering the core to be measured by controlling the acquisition unit, and subtracting the volume change caused by the rise of the fluid pressure from the volume change of the injection unit before and after saturation, and then subtracting the dead volume of the measuring device to obtain the volume of the fluid entering the core to be measured, so as to calculate and obtain the effective porosity of the core to be measured.
Wherein, according to the related standard, the confining pressure is 2.5MPa, the vacuumizing time is 48h, and the pressure required by the experiment is the formation pressure of the oil and gas reservoir and is determined according to the oil field.
Wherein, the rock core that awaits measuring of saturation step by step many times includes:
under the atmospheric pressure condition, pushing the fluid in the middle container to be injected into the core to be tested through the injection unit, so that the core to be tested is saturated;
increasing injection pressure and confining pressure to saturate the rock core to be measured;
and repeating the steps, and recording the volume of the fluid entering the core to be measured when the injection pressure reaches the formation pressure and the confining pressure reaches the overburden pressure.
Specifically, the intermediate container is connected with the core holder through a third two-way valve and a fourth two-way valve, the fourth two-way valve is opened, air in the connecting pipeline is discharged, the fourth two-way valve is closed after liquid flows out of the connecting pipeline, the volume of the injection unit at the moment is recorded, the first two-way valve is closed after vacuumizing is finished, the third two-way valve and the fourth two-way valve are opened, the fluid in the intermediate container is injected into the core to be tested through the injection unit, the core to be tested is saturated, when the volume of the injection unit is not changed any more, the confining pressure applied by the confining pressure unit and the injection pressure of the injection unit are simultaneously increased, the confining pressure at the initial stage is higher than the injection pressure, the injection pressure is slowly increased, after each increase, the injection pressure does not enter the core to be tested any more, after the injection pressure is increased to the formation pressure, the confining pressure is increased to the upper pressure, and after the injection unit is stabilized, the volume of the injection unit is recorded by controlling the acquisition unit as the volume of the saturated injection unit.
Wherein the overburden pressure is a fixed value, typically determined for a particular field.
As a preferred scheme, the core to be detected is pretreated before being placed into the core holder.
Wherein, carry out the preliminary treatment to the rock core that awaits measuring and include:
placing the core to be tested in a constant temperature box for drying, taking out the core after drying to constant weight, and placing the core in a dryer for cooling;
measuring the diameter and the length of a core to be measured;
measuring the cavity volume of the assay device;
and placing the pretreated rock core to be detected in a rock core holder.
Specifically, a core to be measured is placed in a thermostat and dried, the thermostat is set to be 105 ℃ according to relevant standards, the core to be measured is dried to be constant weight and then taken out and placed in a dryer for cooling, the diameter and the length of the core to be measured after drying and cooling are measured, the cavity volume of a measuring device is calibrated before a measuring experiment is carried out, so that errors caused by measurement of porosity are avoided, and the core to be measured is placed in a core holder after the pretreatment operation is carried out.
Preferably, the cavity volume of the measuring device comprises the dead volume of the core holder, the volume of the connecting pipeline and the volume of each two-way valve.
The method is simple and accurate, and can nondestructively measure the effective porosity of the rock sample under the condition of the oil-gas reservoir.
Example 1
Fig. 1 is a schematic diagram illustrating an apparatus for determining effective porosity of a shale core according to an exemplary embodiment of the present invention.
As shown in fig. 1, this embodiment provides an apparatus for determining effective porosity of a shale core, including: the device comprises a vacuumizing unit 1, a rock core holder 3, a confining pressure unit 5, an intermediate container 8, an injection unit 9 and a control acquisition unit 10;
wherein, one end of the rock core holder 3 is connected with the vacuumizing unit 1, and the other end is connected with the middle container 8;
the confining pressure unit 5 is connected to the core holder 3;
the other end of the intermediate container 8 is connected with an injection unit 9;
the control acquisition unit 10 is connected to the injection unit 9 for acquiring data of the injection unit 9.
Further, the measuring apparatus further comprises:
the first two-way valve 2 is arranged between the rock core holder 3 and the vacuumizing unit 1;
the second two-way valve 4 is arranged between the rock core holder 3 and the confining pressure unit 5;
the third two-way valve 6 is arranged between the core holder 3 and the middle container 8 and is close to the core holder 3;
and the fourth two-way valve 7 is arranged between the core holder 3 and the intermediate container 8 and is close to the intermediate container 8.
Wherein the injection unit 9 is an injection pump.
In the embodiment, a Quizix injection pump is adopted, the metering volume of the Quizix injection pump is accurate, and the precision can reach 0.0001 mL.
In this embodiment, the control and acquisition unit 10 is a desktop computer.
The intermediate container 8 is filled with fluid, and the fluid in the intermediate container 8 is pushed into the core to be tested through the injection unit 9 to saturate the core to be tested.
In this embodiment, the fluid in the intermediate container 8 is petroleum ether, which is a polar substance and is volatile, and does not damage the shale sample.
Example 2
Fig. 2 is a flow chart illustrating steps of a method for determining the effective porosity of a shale core according to an exemplary embodiment of the present invention.
As shown in fig. 2, this embodiment provides a method for determining effective porosity of a shale core, including:
placing a core to be tested in the core holder 3, applying confining pressure to the core holder 3, and vacuumizing the core to be tested;
the fluid in the intermediate container 8 is pressurized to an experimental pressure through the injection unit 9, and the compression coefficient of the fluid is obtained;
the core to be measured is saturated step by step for multiple times, and the volume of the fluid entering the core to be measured is recorded through the control acquisition unit 10;
and acquiring the porosity of the core to be measured based on the volume of the entering fluid, the cavity volume of the measuring device and the volume change of the entering fluid after compression.
Wherein, the rock core that awaits measuring of saturation step by step many times includes:
under the atmospheric pressure condition, pushing the fluid in the middle container 8 to be injected into the core to be tested through the injection unit 9 to saturate the core to be tested;
increasing injection pressure and confining pressure to saturate the rock core to be measured;
and repeating the steps, and recording the volume of the fluid entering the core to be measured when the injection pressure reaches the formation pressure and the confining pressure reaches the overburden pressure.
Wherein, before the rock core that awaits measuring is put into rock core holder 3, carry out the preliminary treatment to the rock core that awaits measuring and include:
placing the core to be tested in a constant temperature box for drying, taking out the core after drying to constant weight, and placing the core in a dryer for cooling;
measuring the diameter and the length of a core to be measured;
measuring the cavity volume of the assay device;
and placing the pretreated core to be detected in the core holder 3.
The cavity volume of the measuring device comprises the dead volume of the rock core holder 3, the volume of the connecting pipeline and the volume of each two-way valve.
The fluid in the intermediate container 8 is petroleum ether which is a polar substance and is volatile, and the shale sample cannot be damaged.
Specifically, the measurement method is applied to practice, the cavity volume of the measurement device is calibrated before the test, the cavity volume of the measurement device in this embodiment is 1mL, wherein the diameter and the length of the core to be measured are respectively 2.5cm and 6cm, and then the total volume of the core to be measured is 29.45cm 3 Intermediate containerThe middle container 8 is filled with petroleum ether, the middle container 8 is connected with a Quizix injection pump, the initial value of the injection pump is recorded as a starting value, the fourth two-way valve 7 is closed, the pressure of the middle container 8 is gradually increased to the formation pressure, the final value of the injection pump is recorded after stabilization, the volume of the petroleum ether is changed to 1.6mL due to pressure rise, and then the pressure of the middle container 8 is restored to the original shape.
Loading a rock core to be measured into a rock core holder 3, applying 2.5MPa confining pressure through a confining pressure unit 5, then closing a third two-way valve 6, opening a first two-way valve 2, vacuumizing the rock core for 48 hours through a vacuumizing unit 1, after vacuumizing is finished, closing the first two-way valve 2, opening the third two-way valve 6 and a fourth two-way valve 7, pushing petroleum ether into the rock core holder 3 through a Quizix injection pump to saturate the rock core to be measured, gradually increasing injection pressure and confining pressure when the volume of the injection pump is not changed, finally increasing the injection pressure to formation pressure of 20MPa, then increasing the confining pressure to overburden pressure of 30MPa, recording the volume of the injection pump at the moment after the injection pump is stabilized, subtracting the initial volume from the final volume of the injection pump to obtain the volume of the petroleum ether entering a measuring device to be 4.42mL, subtracting 1.6mL from the volume of the petroleum ether actually injected into the rock sample under 20MPa, and then subtracting 1mL from the volume of a cavity, 1.82mL, and the effective porosity of the rock sample was calculated to be 6.17%.
The effective porosity of the rock sample under the condition of the oil and gas reservoir can be nondestructively measured by the measuring method.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. A method for measuring the effective porosity of a shale core utilizes a measuring device of the effective porosity of the shale core, and the measuring device comprises:
the device comprises a vacuumizing unit, a rock core holder, a confining pressure unit, an intermediate container, an injection unit and a control acquisition unit;
one end of the rock core holder is connected with the vacuumizing unit, and the other end of the rock core holder is connected with the middle container;
the confining pressure unit is connected to the core holder;
the other end of the intermediate container is connected with the injection unit;
the control acquisition unit is connected to the injection unit and used for acquiring data of the injection unit;
wherein the assay device further comprises:
the first two-way valve is arranged between the rock core holder and the vacuumizing unit;
the second two-way valve is arranged between the rock core holder and the confining pressure unit;
a third two-way valve disposed between the core holder and the intermediate container, proximate to the core holder;
the fourth two-way valve is arranged between the rock core holder and the intermediate container and is close to the intermediate container; the injection unit is an injection pump;
the assay method comprises:
placing a core to be tested in a core holder, applying confining pressure to the core holder, and vacuumizing the core to be tested;
boosting the pressure of the fluid in the intermediate container to an experimental pressure through an injection unit, and obtaining the compression coefficient of the fluid;
gradually saturating the core to be measured for multiple times, and recording the volume of the fluid entering the core to be measured through a control acquisition unit;
acquiring the porosity of the core to be measured based on the volume of the entered fluid, the volume of a cavity of the measuring device and the volume change of the entered fluid after compression;
wherein, the step-by-step saturation of the core to be measured for a plurality of times comprises the steps of:
under the atmospheric pressure condition, pushing the fluid in the intermediate container to be injected into the core to be detected through the injection unit, so that the core to be detected is saturated;
increasing the injection pressure and the confining pressure to saturate the rock core to be detected;
and repeating the steps, and recording the volume of the fluid entering the core to be tested when the injection pressure reaches the formation pressure and the confining pressure reaches the overburden pressure.
2. The method for determining shale core effective porosity as claimed in claim 1, wherein the precision of said injection pump is not less than 0.005 mL.
3. The method for determining the effective porosity of the shale core according to claim 1, wherein the control acquisition unit is a desktop computer, a notebook computer or a tablet computer.
4. The method for determining the effective porosity of the shale core as claimed in claim 1, wherein the core to be tested is pretreated before being placed in the core holder.
5. The method for determining the effective porosity of the shale core as claimed in claim 4, wherein the pre-processing of the core to be tested comprises:
placing the core to be tested in a constant temperature box for drying, taking out the core after drying to constant weight, and placing the core in a dryer for cooling;
measuring the diameter and the length of the core to be measured;
measuring the cavity volume of the assay device;
and placing the pretreated core to be detected in the core holder.
6. The method for determining the effective porosity of the shale core as claimed in claim 5, wherein the cavity volume of the determination device comprises a dead volume of the core holder, a volume of a connecting pipeline and a volume of each two-way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266708.XA CN110320136B (en) | 2018-03-28 | 2018-03-28 | Device and method for measuring effective porosity of shale core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266708.XA CN110320136B (en) | 2018-03-28 | 2018-03-28 | Device and method for measuring effective porosity of shale core |
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| Publication Number | Publication Date |
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| CN110320136A CN110320136A (en) | 2019-10-11 |
| CN110320136B true CN110320136B (en) | 2022-08-05 |
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| CN110873688B (en) * | 2019-11-28 | 2020-09-15 | 中国科学院地质与地球物理研究所 | Method and system for measuring pore structure of tight sandstone |
| CN113567315B (en) * | 2020-04-28 | 2024-05-31 | 中国石油化工股份有限公司 | Reservoir rock compression coefficient measurement experiment system and experiment method for multi-round injection and production process of gas storage |
| CN111366524B (en) * | 2020-04-29 | 2021-05-28 | 兰州理工大学 | Porosity measuring device and method for porous medium |
| CN114076716B (en) * | 2020-08-20 | 2024-08-27 | 中国石油天然气股份有限公司 | Rock pore volume compression coefficient measuring device and measuring system |
| CN114199737A (en) * | 2020-09-17 | 2022-03-18 | 中国石油化工股份有限公司 | Device and method for measuring effective porosity |
| CN113945502B (en) * | 2021-10-22 | 2023-09-26 | 蜂巢能源科技有限公司 | Porosity testing tool and testing method thereof |
| CN114935512A (en) * | 2022-05-24 | 2022-08-23 | 中国海洋石油集团有限公司 | Ultrahigh-temperature and high-pressure device and method for jointly measuring rock sample resistivity and capillary pressure |
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| CN102353625B (en) * | 2011-08-31 | 2013-11-06 | 中国石油大学(北京) | Method for measuring overburden porosity with water in permeation fluid mechanics experiment |
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