CN114608958B - Device and method for testing true triaxial mechanical properties of shale under gas-solid thermal fluidization coupling - Google Patents
Device and method for testing true triaxial mechanical properties of shale under gas-solid thermal fluidization coupling Download PDFInfo
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- CN114608958B CN114608958B CN202210184617.8A CN202210184617A CN114608958B CN 114608958 B CN114608958 B CN 114608958B CN 202210184617 A CN202210184617 A CN 202210184617A CN 114608958 B CN114608958 B CN 114608958B
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- 239000000243 solution Substances 0.000 claims description 90
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
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- 238000011084 recovery Methods 0.000 claims description 8
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- 230000015572 biosynthetic process Effects 0.000 claims description 2
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- 238000004321 preservation Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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Abstract
The application discloses a device and a method for testing true triaxial mechanical properties of shale under gas-solid thermal fluidization coupling, wherein the device comprises the following components: the true triaxial stress loading mechanism is used for applying a three-dimensional stress field to the rock sample to be tested; the heating furnace is used for heating the rock sample to be measured; the shale gas conveying mechanism and the ionic solution seepage mechanism are used for constructing shale gas occurrence environments and ionic solution seepage conditions for the rock sample to be tested and simulating chemical reaction environments of the rock sample to be tested; the control system is used for controlling the work of the true triaxial stress loading mechanism, the heating furnace, the shale gas conveying mechanism and the ion solution seepage mechanism and realizing data acquisition. The application realizes the indoor simulation of the real occurrence environment of the deep shale for the first time, can carry out experimental study on the real triaxial mechanical properties of the deep shale under the real condition, and provides the experimental basis closest to the actual condition of the engineering for the deep shale gas exploitation engineering under the complex environment of deep high temperature, high pressure, ion seepage and chemical gas occurrence.
Description
Technical Field
The invention belongs to the technical field of rock mechanical property testing, and particularly relates to a shale true triaxial mechanical property testing device and method under gas-solid thermal fluidization coupling.
Background
Shale gas is natural gas which is buried in a shale layer, the component of the shale gas is mainly methane, and the shale gas is clean and efficient energy resource and chemical raw material. For shale rock formations, the engineering characteristics depend on the geological environment of the rock body, namely the physical environment such as stress field, temperature field, seepage field and the like of the rock body, and the chemical environment such as methane gas, ionic solution and the like. These factors interact and influence so that the rock mass is in real time in a balanced system of these factors. At present, the research device and method for the mechanical properties of shale rock mass basically meet the stress loading under gas-solid coupling, but consider the high-temperature environment of deep shale less, and consider the chemical factors such as ionic solution and chemical erosion reaction of chemical gas under the shale occurrence environment difficultly, so that various indexes of the shale mechanical properties tested in the existing test device and experimental technology are not ideal, and compared with the engineering actual situation, the error is often larger.
Along with the deep exploitation of shale gas, the temperature of shale as shale gas reservoir gradually rises, the exploitation depth is greater than 3000 m, the temperature is generally above 100 ℃, and the new requirement for considering the temperature field is put forward for laboratory research of shale gas reservoir characteristics. In addition, as the depth of production increases, the subsurface chemical ion components that are present in shale gas reservoirs become more complex, resulting in the need for new testing apparatus and methods that can take into account the effects of such fluidization in deep reservoirs on reservoir mechanical properties. In summary, as shale gas is extracted to deep, the influence of real-time high-temperature action and fluidization action of deep stratum on the mechanical properties of the reservoir needs to be considered, and the mechanical properties of the deep shale gas reservoir are difficult to be researched by utilizing the conventional true triaxial gas-solid coupling devices, so that new test devices and methods are required to be provided to make up for the defects of the prior art and devices.
Disclosure of Invention
The application mainly aims to provide a device and a method for testing the true triaxial mechanical properties of shale under gas-solid thermal fluidization coupling, which realize the indoor simulation of the true occurrence environment of deep shale for the first time, can perform experimental study on the true triaxial mechanical properties of shale under the true condition, and provide the experimental basis closest to the actual conditions of the engineering for deep shale gas exploitation engineering under the complex environments of deep high temperature, high pressure, chemical ion seepage and gas occurrence.
Therefore, on the one hand, the invention provides a shale true triaxial mechanical property testing device under gas-solid thermal fluidization coupling, which comprises the following components:
the true triaxial stress loading mechanism is used for applying a three-dimensional stress field to the rock sample to be tested;
the heating furnace is used for heating the rock sample to be measured;
the shale gas conveying mechanism and the ionic solution seepage mechanism are used for constructing shale gas occurrence environments and ionic solution seepage conditions for the rock sample to be tested and simulating chemical reaction environments of the rock sample to be tested;
The control system is used for controlling the work of the true triaxial stress loading mechanism, the heating furnace, the shale gas conveying mechanism and the ion solution seepage mechanism and realizing data acquisition; wherein the ionic solution is obtained directly from the geological environment in which the shale is located or is approximately configured based on chemical ionic components in the geological environment in which the shale is located.
Specifically, the true triaxial stress loading mechanism comprises an upper loading cushion block, a lower loading cushion block, a front loading cushion block, a rear loading cushion block, a left loading cushion block, a right loading cushion block and loading rods for loading the loading cushion blocks, wherein the upper loading cushion block, the lower loading cushion block, the front loading cushion block, the rear loading cushion block, the left loading cushion block, the right loading cushion block and the loading rods are arranged outside the heating furnace and extend into the heating furnace, the loading cushion blocks are all in sliding connection with the furnace wall of the heating furnace, each corner of a rock sample is wrapped by a sealed seepage box, and the sealed seepage box and the upper loading cushion block, the lower loading cushion block, the front loading cushion block, the rear loading cushion block, the left loading cushion block and the right loading cushion block jointly enclose a seepage loading chamber which is matched with the rock sample and is sealed.
Specifically, shale gas conveying mechanism includes high-pressure gas tank and gas recovery jar, go up the loading on the first with the gas injection hole of infiltration loading room intercommunication that is equipped with down the loading on the first with the gas return hole of infiltration loading room intercommunication, the high-pressure gas tank through gas delivery pipeline with the gas injection hole intercommunication, the gas return hole through return liquid pipeline with the gas recovery jar is connected, be equipped with the check valve on the return liquid pipeline, be close to on the gas return hole rock sample position department is equipped with the first hole sealing valve that can open and close, when carrying out the ion solution seepage flow, first hole sealing valve will the gas return hole is closed.
Specifically, the control system comprises an air pressure regulating valve, an air pressure controller, an air pressure sensor and an air pressure gauge, wherein the air pressure regulating valve and the air pressure controller are arranged on the air conveying pipeline, the air pressure sensor is embedded in the left loading cushion block and connected with the air pressure gauge outside through a lead wire, the air pressure regulating valve, the air pressure controller and the air pressure sensor form an air pressure control circuit, and a high-pressure shale air environment is arranged on a rock sample to be tested.
Specifically, the ionic solution seepage mechanism comprises an ionic solution tank, the upper loading head is provided with a liquid injection hole communicated with the seepage loading chamber, the lower loading head is provided with a liquid return hole communicated with the seepage loading chamber, the ionic solution tank is communicated with the liquid injection hole through an ionic solution conveying pipeline, and the liquid return hole is communicated with the ionic solution tank through an ionic solution return pipeline; and a second hole sealing valve which can be opened and closed is arranged on the liquid return hole and is close to the rock sample position, and the second hole sealing valve closes the liquid return hole when the ion solution seepage is carried out.
Specifically, the control system also comprises a booster pump, a hydraulic controller, a seepage pressure sensor and a seepage pressure gauge, wherein a stop valve, the booster pump and the hydraulic controller are arranged on the ion solution conveying pipeline, the seepage pressure sensor is embedded in the right loading cushion block and is connected with the external seepage pressure gauge through a lead wire, the seepage pressure sensor, the hydraulic controller and the seepage pressure gauge form a hydraulic control circuit, and a seepage environment is set for a rock sample to be tested.
Specifically, the control system further comprises a temperature controller, a temperature sensor and a temperature display, wherein the temperature controller, the temperature sensor and a heating wire in the heating furnace are connected through a high-temperature-resistant lead wire to form a heating control circuit, and the temperature sensor is connected with the temperature display.
Specifically, the control system further comprises a signal input end, a signal controller and a signal output end, the air pressure sensor and the seepage pressure sensor transmit test data to the data input port and then feed back to the signal controller, the signal controller processes and analyzes the acquired data and compares the acquired data with a command signal, the difference signal is amplified reversely, the shale air pressure and the ion solution seepage pressure are changed towards the direction of eliminating deviation, and the signal controller transmits a regulating command to the air pressure controller and the outlet port of the hydraulic controller through the signal output port, so that the shale air pressure and the ion solution seepage pressure are accurately regulated.
Specifically, the sealed seepage box is made of rubber materials with good compressibility and high elasticity.
The invention further provides a shale true triaxial mechanical property testing method under gas-solid thermal fluidization coupling, which comprises the following steps:
Step one: obtaining a rock sample;
step two: matching the rock sample into a permeable loading chamber surrounded by a loading cushion block and a sealed seepage box;
Step three: chemical gases such as methane are sent into the permeation loading chamber by utilizing the shale gas conveying mechanism, the occurrence environment of shale gas in shale is simulated, and the gas environment setting is completed;
Step four: the ion solution seepage mechanism is utilized to permeate ion solution into the rock sample, the ion solution seepage environment of the underground shale rock stratum is simulated, and the ion solution seepage field setting is completed;
step five: starting a high-temperature heating furnace, heating the rock sample to a set temperature and maintaining the temperature constant to finish the setting of the environment of a rock sample temperature field;
step six: applying stress to the rock sample to be tested by using a true triaxial stress loading mechanism, and completing application of a true triaxial pressure field;
Step seven: and simulating mechanical behaviors of the rock sample under different ground stresses, realizing data acquisition by a control system, and obtaining a breaking curve and breaking characteristics of the rock sample to be tested by a series of triaxial test results to obtain the mechanical properties of the rock sample under the gas-solid-heat-force-flow coupling state.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects:
1. By refitting the true triaxial loading experimental device, the experimental device and the method for testing the mechanical properties of the surrounding rock of the shale gas exploitation engineering under the in-situ stress state can realize the real-time high temperature by means of the true triaxial loading device, the real-time high-temperature heating furnace, the ion solution seepage mechanism, the shale gas conveying mechanism and the like, and truly simulate the ion solution seepage field where the shale is positioned and the shale gas occurrence environment.
2. The shale gas conveying mechanism and the ion solution seepage mechanism are used for constructing shale gas occurrence environments and ion solution seepage conditions for the rock sample to be tested, so that gas-solid-liquid coupling is realized, and meanwhile, the chemical reaction environment of the rock sample to be tested is simulated; simulating the physical environment of the rock sample to be tested by a real-time heating mechanism of a real-time triaxial stress loading mechanism and a heating furnace; the shale gas conveying mechanism and the ion solution seepage mechanism realize gas-solid-liquid coupling and physical-chemical coupling together with the true triaxial stress loading mechanism and the heating furnace.
3. The control system is used for accurately controlling the pressure of shale gas and ion solution seepage, compares the air pressure and seepage pressure monitored in real time with preset instructions through the signal controller, and changes the shale gas pressure and ion solution seepage pressure towards the direction of eliminating deviation by reversely amplifying the difference signal and performing high-frequency cyclic comparison adjustment, so that the accurate adjustment of the shale gas pressure and ion solution seepage pressure is realized.
4. The seepage loading chamber is formed by enclosing a sealed seepage box and six loading cushion blocks for sealing openings on each side of the sealed seepage box, and the sealed seepage box is a flexible sealing frame for wrapping each corner of a rock sample, so that the test system can be tested under seepage, high-pressure gas and triaxial stress coupling conditions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a shale true triaxial mechanical property testing device under gas-solid thermal fluidization coupling, which is provided by the embodiment of the invention;
fig. 2 is a schematic top view of a shale true triaxial mechanical property testing device under gas-solid thermal fluidization coupling according to an embodiment of the present invention.
Wherein: 1. a true triaxial stress loading mechanism; 101. loading a cushion block; 102. a cushion block is loaded downwards; 103. front loading cushion blocks; 104. loading the cushion block; 105. a left loading cushion block; 106. a right loading cushion block; 107. a loading rod; 2. a heating furnace; 201. a heating wire; 3. shale gas conveying mechanism; 301. a high pressure gas tank; 302. a gas recovery tank; 303. an air injection hole; 304. an air return hole; 305. a gas delivery conduit; 306. a liquid return pipeline; 307. a check valve; 308. a first sealing valve; 4. an ionic solution seepage mechanism; 401. an ion solution tank; 402. a liquid injection hole; 403. a liquid return hole; 404. an ionic solution delivery line; 405. an ionic solution return line; 406. a second sealing valve; 407. a stop valve; 5. a control system; 501. an air pressure regulating valve; 502. an air pressure controller; 503. an air pressure sensor; 504. an air pressure gauge; 505. a booster pump; 506. a hydraulic controller; 507. a seepage pressure sensor; 508. a seepage pressure gauge; 509. a temperature controller; 510. a temperature sensor; 511. a temperature display; 512. a signal input terminal; 513. a signal controller; 514. a signal output terminal; 6. a rock sample; 7. sealing the seepage box; 8. and sliding the sealing sleeve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 and 2, a shale true triaxial mechanical property testing device under gas-solid thermal fluidization coupling comprises a true triaxial stress loading mechanism 1, a heating furnace 2, a shale gas conveying mechanism 3, an ion solution seepage mechanism 4 and a control system 5, wherein the true triaxial stress loading mechanism 1 is used for applying a three-dimensional stress field to a rock sample 6 to be tested, the heating furnace 2 is used for heating the rock sample 6 to be tested, and the ion solution seepage system is used for inputting seepage solution into the rock sample 6 to be tested so as to apply an ion solution seepage field to the rock sample 6 to be tested; the ionic solution refers to a liquid component in a shale gas reservoir, and mainly comprises water, potassium chloride (Kcl), calcium carbonate (CaCO 3), magnesium carbonate (MgCO 3) and other compounds, wherein the compounds can be directly obtained from a geological environment where deep shale is located or are equally configured based on chemical ion components in the geological environment where the deep shale is located, the shale gas conveying mechanism 3 is used for constructing a shale gas occurrence environment for a rock sample 6 to be tested, and the control system 5 is used for controlling the true triaxial stress loading mechanism 1, the heating furnace 2, the shale gas conveying mechanism 3 and the ionic solution seepage mechanism 4 to work and realize data acquisition.
In the embodiment, a test device and a test method for realizing real-time high temperature, truly simulating an ion solution seepage field where shale is positioned and a shale gas occurrence environment and testing the mechanical properties of surrounding rocks of shale gas exploitation engineering in an in-situ stress state are formed by means of a true triaxial stress loading mechanism 1, a real-time high-temperature heating furnace 2, an ion solution seepage mechanism 4, a shale gas conveying mechanism 3 and the like.
In addition, a shale gas occurrence environment and an ion solution seepage condition are created for the rock sample 6 to be tested through the shale gas conveying mechanism 3 and the ion solution seepage mechanism 4, so that gas-solid-liquid coupling is realized, and meanwhile, the chemical reaction environment of the rock sample 6 to be tested is simulated; simulating the physical environment of the rock sample 6 to be tested by a real-time heating mechanism of the real-time triaxial stress loading mechanism 1 and the heating furnace 2; the shale gas conveying mechanism 3 and the ion solution seepage mechanism 4 realize gas-solid-liquid coupling and physical-chemical coupling together with the true triaxial stress loading mechanism 1 and the heating furnace 2.
Referring to fig. 1 and 2, it can be understood that in practical application, the true triaxial stress loading mechanism 1 includes an upper loading cushion 101, a lower loading cushion 102, a front loading cushion 103, a rear loading cushion 104, a left loading cushion 105, a right loading cushion 106 and a loading rod 107 for loading each loading cushion, which are disposed outside the heating furnace 2 and extend into the heating furnace 2, each loading cushion is slidably connected with a furnace wall of the heating furnace 2, each corner of the rock sample 6 is wrapped by a sealed seepage box 7, and the sealed seepage box 7, the upper loading cushion 101, the lower loading cushion 102, the front loading cushion 103, the rear loading cushion 104, the left loading cushion 105 and the right loading cushion 106 together enclose a seepage loading chamber which is adapted to the rock sample 6 and is closed, so as to realize stable application of a chemical gas environment and an ion solution seepage field.
The sealed seepage box 7 is made of rubber materials with good compressibility and high elasticity, the sealed seepage box 7 is in a frame shape, six loading cushion blocks seal openings on each side part of the sealed frame, and the displacement of loading rods 107 in opposite X/Y/Z directions (up and down, left and right and front and back) can not be influenced when stress is loaded, and meanwhile, the sealing function can be realized; the rock sample 6 to be measured with the size of 100x 100 can be placed in the infiltration loading chamber, the size of six loading cushion blocks is 90 x 90, the size of the cushion blocks is smaller than that of the rock sample 6 to be measured, and in the loading process, each loading cushion block can move independently and does not interfere with each other.
Referring to fig. 1 and 2, in some embodiments, the shale gas conveying mechanism 3 includes a high-pressure gas tank 301 and a gas recovery tank 302, a gas injection hole 303 communicated with a permeation loading chamber is formed on an upper loading head, a gas return hole 304 communicated with the permeation loading chamber is formed on a lower loading head, the high-pressure gas tank 301 is communicated with the gas injection hole 303 through a gas conveying pipeline 305, the gas return hole 304 is connected with the gas recovery tank 302 through a liquid return pipeline 306, a check valve 307 is arranged on the liquid return pipeline 306, the check valve 307 is a one-way stop valve 407, gas in the gas recovery tank 302 can be prevented from reversely flowing back to the gas conveying pipeline 305, a first hole sealing valve 308 capable of being opened and closed is arranged on the gas return hole 304 at a position close to a rock sample 6, and when ion solution permeation is carried out, the first hole sealing valve 308 closes the gas return hole 304 and the gas conveying pipeline are prevented from entering the gas return hole 304.
The control system 5 comprises an air pressure regulating valve 501, an air pressure controller 502, an air pressure sensor 503 and an air pressure gauge 504, wherein the air pressure regulating valve 501 and the air pressure controller 502 are arranged on the air conveying pipeline 305, the air pressure sensor 503 is embedded in the left loading cushion block 105 and connected with the air pressure gauge 504 outside through a lead wire, the air pressure controller 502 controls the air pressure regulating valve 501 to regulate the air pressure of shale air, the air pressure regulating valve 501 regulates the air flow through the opening and closing degree of the valve, and the air pressure regulating valve 501, the air pressure controller 502 and the air pressure sensor 503 form an air pressure control circuit, so that a high-pressure shale air environment is set for the rock sample 6 to be tested.
Specifically, the ionic solution seepage mechanism 4 includes an ionic solution tank 401, a liquid injection hole 402 communicated with the osmotic loading chamber is arranged on the upper loading head, a liquid return hole 403 communicated with the osmotic loading chamber is arranged on the lower loading head, the ionic solution tank 401 is communicated with the liquid injection hole 402 through an ionic solution conveying pipeline 404, the liquid return hole 403 is communicated with the ionic solution tank 401 through an ionic solution return pipeline 405, a second hole sealing valve 406 capable of being opened and closed is arranged at a position, close to the rock sample 6, on the liquid return hole 403, and when the ionic solution seepage is carried out, the second hole sealing valve 406 closes the liquid return hole 403. The control system 5 further comprises a booster pump 505, a hydraulic controller 506, a seepage pressure sensor 507 and a seepage pressure gauge 508, a stop valve 407, the booster pump 505 and the hydraulic controller 506 are arranged on the ion solution conveying pipeline 404, the seepage pressure sensor 507 is embedded in the right loading cushion block 106 and is connected with the external seepage pressure gauge 508 through a lead wire, the seepage pressure sensor 507, the hydraulic controller 506 and the seepage pressure gauge 508 form a hydraulic control circuit, and a seepage environment is set for the rock sample 6 to be tested.
In this embodiment, after the ionic solution in the ionic solution tank 401 is pressurized by the booster pump 505, the ionic solution flows into the rock sample 6 to be measured from the injection hole 402 and flows out from the liquid return hole 403 into the ionic solution tank 401, so that the circulating flow of the seepage ionic solution can be realized, the hydraulic controller 506 controls the booster pump 505 to pressurize the ionic solution, when shale gas pumping is performed, the second hole sealing valve 406 is closed, the shale gas is prevented from entering the liquid return hole 403 and the ionic solution conveying pipeline 404, and both hole sealing valves are controlled by the control system 5.
Referring to fig. 1, in other embodiments, the control system 5 further includes a temperature controller 509, a temperature sensor 510, a temperature display 511, a signal input end 512, a signal controller 513 and a signal output end 514, the temperature sensor 510 is disposed on the top inner wall of the heat preservation cavity of the heating furnace 2, the heating wire 201 is disposed at the top and bottom of the heat preservation cavity, the temperature sensor 510, the temperature controller 509 and the heating wire 201 are connected through a high temperature-resistant lead in the heat preservation cavity to form a control circuit, the rock sample 6 to be tested is heated, the temperature sensor 510 is connected with the temperature display 511, the air pressure sensor and the seepage pressure sensor 507 transmit test data to a data input port, and then feed back to the signal controller 513, the signal controller 513 processes and analyzes the acquired data, and compares with a command signal, reversely amplifies a difference signal, changes the air pressure and the seepage pressure of an ionic solution toward a direction of eliminating deviation, and the signal controller 513 transmits a regulation command to the air pressure controller 502 through the signal output end 514, an outlet port of the hydraulic controller 506, and then carries out accurate circulation regulation on the seepage pressure of the shale air pressure and the ionic solution, and a stable command is given.
Specifically, a sliding sealing sleeve 8 is arranged between the heat preservation cavity of the heating furnace 2 and the loading cushion block of the true triaxial stress loading mechanism 1, so that displacement between two loading rods 107 in the opposite X/Y/Z directions can be adjusted, and meanwhile, the heating cavity is sealed, and the heating effect is ensured.
Referring to fig. 1, the specific process of testing the mechanical properties of deep shale by using the shale true triaxial mechanical properties testing device under the gas-solid thermal fluidization coupling is as follows:
Step one, obtaining a shale rock sample 6 in shale gas exploitation engineering, wherein the sample is a regular hexahedron, and the size is 100 x 100;
step two, putting the rock sample 6 in a seepage pressure chamber formed by six loading cushion blocks and a sealed seepage box 7 in a matching way;
step three, opening a first hole sealing valve 308 to enable the gas injection hole 303, the rock sample 6 to be tested and the gas return hole 304 to be unblocked; plugging the liquid return hole 403 by using a second hole sealing valve 406;
Step four, shale gas conveying is carried out on the shale samples 6 by utilizing a shale gas conveying mechanism 3, the air pressure of the shale gas is determined according to shale gas occurrence conditions of the shale samples 6, and after the air pressure reaches a preset value, a first hole sealing valve 308 is utilized to seal an air return hole 304, so that the air pressure of the shale gas in the shale samples is kept stable;
Step five, utilizing an ion solution seepage control mechanism to carry out seepage on a shale sample, simulating a chemical ion solution seepage field in a shale occurrence environment, determining ion solution seepage pressure according to the seepage field where the shale rock sample 6 is positioned, and sealing a liquid return hole 403 by utilizing a second hole sealing valve 406 after the seepage pressure reaches a preset value so as to keep the ion solution seepage pressure in the shale sample stable;
Wherein, the control system 5 is used for accurately controlling command signals, and the closed loop is regulated by the feedback regulation formed by the seepage sensor, the control system 5 and the hydraulic controller 506 to regulate the seepage pressure of the ionic solution applied to the shale rock sample 6; and a feedback regulation closed loop formed by the air pressure sensor 503, the control system 5 and the air pressure controller 502 is utilized to regulate the shale air pressure applied to the shale rock sample 6, so that the shale air pressure and the ion solution seepage pressure are ensured to be stable.
Step six, a temperature field is applied to the shale sample by using a heating furnace 2, the applied temperature is determined according to the underground high-temperature environment where the shale rock sample 6 is positioned, and the temperature is required to be kept unchanged after the applied temperature reaches a preset temperature;
Step seven, starting a true triaxial stress loading mechanism 1, providing triaxial static load simulating in-situ ground stress for a rock sample 6 to be tested, simulating different ground stress states by adjusting the triaxial stress, and performing a series of true triaxial tests to obtain mechanical properties of shale under a true occurrence environment; specifically, the true triaxial stress loading mechanism 1 is utilized to pre-clamp a sample to be tested, hydraulic oil is filled, lateral pressure loading is carried out, axial stress loading is carried out, application of a true triaxial pressure field is completed, mechanical behaviors under different ground stresses are simulated for the rock sample 6, a series of triaxial test results are utilized to obtain a damage curve and damage characteristics of the rock sample 6 to be tested, and the mechanical properties of the shale sample under the seepage coupling state of high temperature, shale gas and ion solution in real time are obtained.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
The above examples are only illustrative of the invention and are not intended to be limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Nor is it necessary or impossible to exhaust all embodiments herein. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
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