System and method suitable for reservoir rock mass engineering geomechanics test testing

Abstract

The present invention discloses a system suitable for reservoir rock mass engineering geomechanics test, including a stress control unit, a temperature control unit and a rock sample holder. The stress control unit includes a rigid pressurizing mechanism and a flexible pressurizing mechanism. The rigid pressurizing mechanism uses a pressure head and a pressure block to load rigid pressure on the rock mass, and the flexible pressurizing mechanism uses a pressurizing medium to apply flexible pressure to the rock mass. The present invention adopts two methods of rigid pressurization and flexible pressurization to better simulate the stress state under actual geological conditions and ensure pressurization uniformity. The temperature control unit uses a heating mechanism and a cooling mechanism to control the temperature of the rock mass. At the same time, the insulation mechanism uses an inner spacer and an outer spacer for double-layer thermal insulation, which can ensure that the rock mass reaches and maintains the temperature conditions of the test, providing a guarantee for the test. The present invention also provides a method suitable for reservoir rock mass engineering geomechanics test.

Description

Technical Field

[0001] The invention relates to the technical field of reservoir rock mass engineering geomechanics test and testing, and in particular to a system and method suitable for reservoir rock mass engineering geomechanics test and testing. Background Art

[0002] For reservoir geological engineering such as carbon dioxide geological utilization and storage, deep-ultra-deep oil and gas development, geothermal development, and geological disposal of nuclear waste, the rock mass will undergo long-term complex physical, chemical, and mechanical responses in a multi-phase and multi-field coupled environment, specifically involving the mechanical properties of the rock mass under harsh conditions of high temperature, high pressure, and high permeability long-term tests, such as temperatures up to 500 degrees Celsius, confining pressures up to 200 MPa, permeability pressures up to 200 MPa, and loading cycles up to half a year. Revealing the pore / crack evolution, long-term deformation, damage degradation, and progressive destruction processes and mechanisms of the rock mass under the coupled conditions of high geotemperature, high geostress, and high permeability pressure is crucial to deepening the understanding of the engineering geomechanical properties of reservoir rock mass and conducting intelligent site selection for deep geological engineering.

[0003] The existing technical means for reservoir rock engineering geomechanics testing are mainly concentrated on the test of rock mechanical behavior under multi-phase field coupled true three-way loading conditions such as below 300 degrees Celsius, confining pressure below 100 MPa, and permeability pressure below 100 MPa. For more complex test environments, the current technical reserves only have reports on relevant technical achievements under a single extreme condition, but cannot effectively meet the strict requirements of test tests for high temperature control, high pressure-high permeability pressure sealing control, and long-term stable loading control. Summary of the invention

[0004] The purpose of the present invention is to provide a system suitable for reservoir rock mass engineering geomechanics test testing to solve the problems existing in the above-mentioned prior art, meet the needs of reservoir rock mass engineering geomechanics test testing, and ensure the smooth progress of the test testing.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a system suitable for reservoir rock mass engineering geomechanics test testing, comprising:

[0007] A stress control unit, the stress control unit includes a rigid pressurizing mechanism and a flexible pressurizing mechanism, the rigid pressurizing mechanism includes a pressure block and a pressure head, the pressure block can be pressed against the rock mass, the pressure head is connected to the pressure block, the pressure head can be connected to a loading driver, the number of the rigid pressurizing mechanisms is six, the six groups of the rigid pressurizing mechanisms are surrounded by a rectangular structure and are arranged around the rock mass to apply true triaxial stress to the rock mass; the flexible pressurizing mechanism includes a pressurizing cavity, the pressurizing cavity is connected to an external pressurizing medium source, the external pressurizing medium source can transport pressurizing medium into the pressurizing cavity to apply flexible pressure to the rock mass;

[0008] A temperature control unit, the temperature control unit comprises a temperature insulation mechanism, a heating mechanism and a cooling mechanism, the temperature insulation mechanism comprises an inner spacer and an outer spacer, the inner spacer is arranged outside the rock mass, the pressing block passes through the inner spacer and abuts against the rock mass; the outer spacer is arranged outside the inner spacer and the pressing block, the pressure head passes through the outer spacer and is connected to the pressing block; the heating mechanism can heat the rock mass; the cooling mechanism can cool the rock mass;

[0009] The rock sample holder is a split structure, and the rock sample holder is arranged outside the outer spacer to fix the stress control unit and the temperature control unit, and the space between the rock sample holder and the pressure block forms the pressurized cavity.

[0010] Preferably, the loading driver is a hydraulic cylinder, and the loading driver is connected to a follow-up hydraulic module, and the follow-up hydraulic module includes a motor, an oil pump and a hydraulic oil tank. The output end of the motor is transmission-connected to the oil pump, and the motor can drive the oil pump to rotate. The oil pump is connected to the hydraulic oil tank, and the oil pump is connected to the loading driver via a main oil circuit. The main oil circuit is also connected to a pilot oil circuit, and a pressure differential balancing valve is provided on the pilot oil circuit.

[0011] Preferably, the pressurized medium is silicone oil.

[0012] Preferably, the heating mechanism comprises a heating plate, which is arranged in the inner spacer and close to the pressing block. The heating plate can heat the pressurized medium and the pressing block to achieve the purpose of heating the rock mass.

[0013] Preferably, the heating plate has a comb-tooth structure.

[0014] Preferably, the refrigeration mechanism includes a cooling channel, and the cooling channel is provided inside and outside the rock sample holder, and the cooling channel is connected to an external cooling medium source, and the external cooling medium source transports cooling medium to the cooling channel to achieve cooling treatment of the rock mass.

[0015] Preferably, a sealing frame is provided on the outer jacket of the rock mass, and the sealing frame is a rectangular parallelepiped frame structure, and the pressing block abuts against the sealing frame to seal the rock mass in the space enclosed by the pressing block;

[0016] The pressing block and the pressing head both have a test channel for installing a test probe, and a sealing ring is arranged in the test channel; a positioning pin is arranged between the pressing head and the pressing block.

[0017] Preferably, the system suitable for engineering geomechanics test of reservoir rock mass further includes a multiphase fluid control unit, which includes an intermediate container, a multi-way valve and a multiphase fluid channel, wherein the intermediate container is capable of accommodating a variety of fluids, the intermediate container is connected to the rock sample holder by a multi-way valve, and the intermediate container is also connected to a pump body; the multiphase fluid channel is arranged in the pressure block, the multiphase fluid channel is a T-shaped channel, the multiphase fluid channel includes an inlet channel, a contact channel and an outlet channel, the inlet channel is connected to the multi-way valve, the contact channel and the outlet channel are both connected to the inlet channel, the outlet of the contact channel is arranged toward the rock mass, and the outlet channel is connected to an external collection container.

[0018] Preferably, the system suitable for reservoir rock engineering geomechanics test testing further comprises a digital control unit, and the stress control unit, the temperature control unit and the multiphase fluid control unit are all communicatively connected to the digital control unit.

[0019] The present invention also provides a method suitable for reservoir rock mass engineering geomechanics test testing, using the above-mentioned loading device suitable for reservoir rock mass engineering geomechanics test testing, comprising the following steps:

[0020] The rock mass is placed in a space surrounded by six groups of the rigid pressurizing mechanisms, the loading driver applies rigid pressure to the rock mass through the pressure head and the pressure block; the flexible pressurizing mechanism applies flexible pressure to the rock mass using a pressurized medium;

[0021] The temperature control unit uses the heating mechanism and the cooling mechanism to adjust the temperature so that the rock mass reaches the test temperature condition, and the insulation mechanism is used for heat preservation and insulation of the rock mass.

[0022] Compared with the prior art, the present invention has achieved the following technical effects: the system suitable for reservoir rock engineering geomechanics test of the present invention comprises a stress control unit, a temperature control unit and a rock sample holder, the stress control unit comprises a rigid pressurizing mechanism and a flexible pressurizing mechanism, the rigid pressurizing mechanism comprises a pressure block and a pressure head, the pressure block can be pressed against the rock mass, the pressure head is connected to the pressure block, the pressure head can be connected to the loading driver, the number of rigid pressurizing mechanisms is six, the six groups of rigid pressurizing mechanisms are surrounded by a rectangular structure and are arranged around the rock mass to apply true triaxial stress to the rock mass; the flexible pressurizing mechanism comprises a pressurizing cavity, the pressurizing cavity is connected to an external pressurizing medium source, and the external pressurizing medium is connected to the external pressurizing medium source. The pressure medium source can transport the pressure medium into the pressurized cavity to apply flexible pressure to the rock mass; the temperature control unit includes an insulation mechanism, a heating mechanism and a cooling mechanism, the insulation mechanism includes an inner spacer and an outer spacer, the inner spacer is arranged on the outside of the rock mass, and the pressure block passes through the inner spacer and abuts against the rock mass; the outer spacer is arranged on the outside of the inner spacer and the pressure block, and the pressure head passes through the outer spacer and is connected to the pressure block; the heating mechanism can heat the rock mass; the cooling mechanism can cool the rock mass; the rock sample holder has a split structure, the rock sample holder is arranged on the outside of the outer spacer to fix the stress control unit and the temperature control unit, and the space between the rock sample holder and the pressure block forms a pressurized cavity.

[0023] The system of the present invention is suitable for reservoir rock engineering geomechanics test, and the stress control unit includes a rigid pressurizing mechanism and a flexible pressurizing mechanism. The rigid pressurizing mechanism uses a pressure head and a pressure block to load rigid pressure on the rock mass, and the flexible pressurizing mechanism uses a pressurized medium to apply flexible pressure to the rock mass. The present invention adopts both rigid pressurization and flexible pressurization to better simulate the stress state under actual geological conditions and ensure pressurization uniformity. The temperature control unit uses a heating mechanism and a cooling mechanism to control the temperature of the rock mass. At the same time, the insulation mechanism uses an inner spacer and an outer spacer for double-layer thermal insulation, which can ensure that the rock mass reaches and maintains the temperature conditions of the test, providing protection for the test.

[0024] The present invention also provides a method suitable for reservoir rock mass engineering geomechanics test testing, using the above-mentioned loading device suitable for reservoir rock mass engineering geomechanics test testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1It is a schematic diagram of a main view of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0027] Figure 2 A side view schematic diagram of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0028] Figure 3 It is a partial cutaway schematic diagram of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a follow-up hydraulic module of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a part of the structure of a pressurized digital control unit of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0031] Figure 6 A schematic cross-sectional view of a pressurized digital control unit of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the cross-section structure of a rock sample holder of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the disassembled structure of a rock sample holder of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of the working principle of a multiphase fluid control unit of a system suitable for reservoir rock mass engineering geomechanics test according to an embodiment of the present invention;

[0035] Fig.10 This is a schematic diagram of the working principle of a digital control unit of a system suitable for reservoir rock engineering geomechanics testing disclosed in an embodiment of the present invention.

[0036] In the figure: 1, stress control unit; 101, rigid pressurizing mechanism; 102, flexible pressurizing mechanism; 103, pressure block; 104, pressure head; 105, loading driver; 106, motor; 107, oil pump; 108, proportional servo valve; 109, differential pressure balancing valve;

[0037] 2. Temperature control unit; 201. Outer spacer; 202. Inner spacer; 203. Heating plate;

[0038] 3. rock sample holder; 301. sealing frame; 302. cooling channel;

[0039] 4. Multiphase fluid control unit; 401. Pump body; 402. Intermediate container; 403. Multi-way valve; 404. Multiphase fluid channel;

[0040] 5. Digital control unit. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a system suitable for reservoir rock mass engineering geomechanics test testing to solve the problems existing in the above-mentioned prior art, meet the needs of reservoir rock mass engineering geomechanics test testing, and ensure the smooth progress of the test testing.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Embodiment 1

[0045] The present embodiment provides a system suitable for reservoir rock engineering geomechanics test, including a stress control unit 1, a temperature control unit 2 and a rock sample holder 3. The stress control unit 1 includes a rigid pressurizing mechanism 101 and a flexible pressurizing mechanism 102. The rigid pressurizing mechanism 101 includes a pressure block 103 and a pressure head 104. The pressure block 103 can be pressed against the rock mass. The pressure head 104 is connected to the pressure block 103. The pressure head 104 can be connected to a loading driver 105. There are six groups of rigid pressurizing mechanisms 101. The six groups of rigid pressurizing mechanisms 101 are surrounded by a rectangular structure and are arranged around the rock mass to apply true triaxial stress to the rock mass. The flexible pressurizing mechanism 102 includes a pressurizing cavity, which is connected to an external pressurizing medium source, and the external pressurizing medium source can pressurize the pressurizing cavity. A pressurized medium is transported in the cavity to apply a flexible pressure to the rock mass; the temperature control unit 2 includes a thermal insulation mechanism, a heating mechanism and a cooling mechanism, the thermal insulation mechanism includes an inner spacer 202 and an outer spacer 201, the inner spacer 202 is arranged on the outside of the rock mass, and the pressure block 103 passes through the inner spacer 202 and abuts against the rock mass; the outer spacer 201 is arranged on the outside of the inner spacer 202 and the pressure block 103, and the pressure head 104 passes through the outer spacer 201 and is connected to the pressure block 103; the heating mechanism can heat the rock mass; the cooling mechanism can cool the rock mass; the rock sample holder 3 is a split structure, the rock sample holder 3 is arranged on the outside of the outer spacer 201 to fix the stress control unit 1 and the temperature control unit 2, and the space between the rock sample holder 3 and the pressure block 103 forms a pressurized cavity.

[0046] The system of the present invention is suitable for reservoir rock engineering geomechanics test, and the stress control unit 1 includes a rigid pressurizing mechanism 101 and a flexible pressurizing mechanism 102. The rigid pressurizing mechanism 101 uses a pressure head 104 and a pressure block 103 to apply rigid pressure to the rock mass, and the flexible pressurizing mechanism 102 uses a pressurizing medium to apply flexible pressure to the rock mass. The present invention adopts two methods of rigid pressurization and flexible pressurization to better simulate the stress state under actual geological conditions and ensure the uniformity of pressurization. The temperature control unit 2 uses a heating mechanism and a cooling mechanism to control the temperature of the rock mass. At the same time, the insulation mechanism uses an inner spacer 202 and an outer spacer 201 for double-layer thermal insulation, which can ensure that the rock mass reaches and maintains the temperature conditions of the test test, providing a guarantee for the test test.

[0047] Specifically, the loading driver 105 is a hydraulic cylinder, and the loading driver 105 is connected to a follow-up hydraulic module, which includes a motor 106, an oil pump 107 and a hydraulic oil tank. Figure 4 The output end of the motor 106 is connected to the oil pump 107 in a transmission manner. The motor 106 can drive the oil pump 107 to rotate. The oil pump 107 is connected to the hydraulic oil tank, and the oil pump 107 is connected to the loading driver 105 via the main oil circuit. The main oil circuit is also connected to a pilot oil circuit, and a pressure differential balancing valve 109 is provided on the pilot oil circuit.

[0048] Among them, the follow-up hydraulic module also includes a proportional servo valve 108, which is installed on a special valve seat. The special valve seat is connected to the oil cylinder through a high-pressure oil pipe. The oil pump 107 uses the proportional servo valve 108 to communicate with the A chamber (plug chamber) and B chamber (rod chamber) of the hydraulic cylinder respectively. The valve core is pushed to move by the change of the pilot oil pressure to realize the overflow flow control of the main oil circuit, ensuring that the pressure difference between the main oil circuit pressure and the pilot oil circuit pressure is constant, that is, ensuring that the pressure of the oil source outlet pressure P is always greater than the pressure P1 of the A chamber or B chamber of the cylinder (P=P1+ΔP, the adjustable range of ΔP is 0.5MPa-2MPa); the follow-up hydraulic module replaces the traditional complex electronic control principle with the hydraulic dynamic pressure difference balance principle to ensure the adaptive control of the hydraulic circuit pressure and realize the two-way pressure intelligent follow-up of the follow-up hydraulic module. The oil supply pressure of the servo hydraulic module is intelligently controlled by the oil cylinder load pressure. When the servo hydraulic module is running at low pressure, the motor 106 has low energy consumption and low noise, eliminating the need for manual adjustment and convenient application, thereby achieving long-term stable loading of the rock mass under high temperature, high pressure and high permeability pressure. The motor 106 drives the oil pump 107 to rotate, and sends the hydraulic oil to the A chamber and the B chamber of the hydraulic cylinder through the high-pressure oil pipe and the pressure difference balance valve 109 to drive the extension and retraction of the hydraulic cylinder piston rod. The servo hydraulic module is as follows Figure 4 shown.

[0049] In this specific embodiment, the hydraulic cylinder transmits rigid pressure to the rock mass through the pressure head 104 and the pressure block 103 in turn. The pressure block 103 is made of high-rigidity insulating material, and a positioning pin is set between the pressure head 104 and the pressure block 103 to ensure stable and uniform application of pressure, so as to achieve the goal of applying true triaxial stress to the rock mass in six directions. It is also necessary to explain here that in actual applications, the six groups of pressure blocks 103 can adopt a linkage structure, or act separately to meet the loading requirements of the test.

[0050] The pressurized medium is silicone oil, and the flexible pressurizing mechanism 102 applies flexible pressure to the rock mass using high temperature and high pressure resistant silicone oil. In practical applications, other loading media, such as gas or special liquid, can also be used according to specific test requirements to meet specific test requirements and ensure pressurization uniformity.

[0051] More specifically, the heating mechanism includes a heating plate 203, which is disposed in the inner spacer 202 and close to the pressing block 103. The heating plate 203 can heat the pressurized medium and the pressing block 103 to achieve the purpose of heating the rock mass. The heating plate 203 can be disposed close to the pressing block 103 to heat the pressurized medium, and the pressurized medium fills the rock sample holder 3 outside the pressing block 103. The heat is transferred to the rock mass through the pressurized medium and the pressing block 103 to achieve and maintain the high temperature conditions set for the test.

[0052] In this specific embodiment, the heating plate 203 has a comb-tooth structure to increase the contact area between the heating plate 203 and the pressurized medium, improve the heating efficiency, and ensure the heating effect.

[0053] In order to achieve accurate control of the test temperature by the temperature control unit 2, the refrigeration mechanism includes a cooling channel 302. The cooling channel 302 is provided inside and outside the rock sample holder 3. The cooling channel 302 is connected to an external cooling medium source. The external cooling medium source transports cooling medium to the cooling channel 302 to achieve cooling treatment of the rock mass. The number and distribution of cooling channels 302 can be adjusted according to actual test requirements. In this specific embodiment, eight cooling channels 302 are provided inside and outside the rock sample holder 3 to cool the outer spacer 201 so that the insulation mechanism can operate stably for a long time under room temperature. The cooling channel 302 outside the rock sample holder 3 can be realized in the form of adding a cooling pipe. The cooling channel 302 inside the rock sample holder 3 can be made by drilling holes on the rock sample holder 3 as the cooling channel 302, or by adding a cooling pipe after drilling holes as the cooling channel 302. This makes it easier to control the circulation of the cooling medium. Figure 7 and Figure 8 As shown; in actual application, it can be flexibly set according to the specific structure of the rock sample holder 3 and the specific loading requirements to improve the flexible adaptability of the rock sample holder 3. It is also necessary to explain here that the rock sample holder 3 has a mounting position that matches the outer spacer 201 to fix the outer spacer 201, and then install the inner spacer 202, the heating plate 203 and the pressing block 103, which is convenient for disassembly and assembly, and provides convenience for rock mass replacement. The rock sample holder 3 is a split structure, which is convenient for disassembly and assembly. The outer spacer 201 and the inner spacer 202 are made of high temperature and high pressure resistant mica sheets to ensure the working reliability of the insulation mechanism.

[0054] It should also be emphasized that, in order to facilitate the permeability test, the rock mass is provided with a sealing frame 301, which is a rectangular frame structure, and the pressing block 103 is against the sealing frame 301 to seal the rock mass in the space surrounded by the pressing block 103, thereby ensuring the sealing performance of the rock mass and facilitating the subsequent permeability test. When the temperature is lower than 200°C, the sealing frame 301 can be made of rubber material, and when the temperature is higher than 200°C, the sealing frame 301 can be made of copper material.

[0055] In order to facilitate monitoring of the test process, the pressure block 103 and the pressure head 104 are provided with a test channel for installing a test probe, and a sealing ring is provided in the test channel. The sealing ring can be sealed by a combination of polyimide and carbon fiber materials, thereby avoiding reverse leakage of high osmotic pressure fluid along the test channel, and ensuring the smooth progress of the test.

[0056] At the same time, the system suitable for reservoir rock engineering geomechanics test of the present invention also includes a multiphase fluid control unit 4, which includes an intermediate container 402, a multi-way valve 403 and a multiphase fluid channel 404. In order to realize the long-term stable loading simulation of the seepage field, chemical field and biological field, the intermediate container 402 can accommodate a variety of fluids. The intermediate container 402 is connected to the rock sample holder 3 by the multi-way valve 403, and the intermediate container 402 is also connected to the pump body 401, so that the multiphase fluid in the intermediate container 402 can smoothly enter the rock sample holder 3. In this specific embodiment, the number of intermediate containers 402 is not less than 6 groups, which can be respectively filled with formation water, oil, carbon dioxide and other inert gases in different phases, chemical solutions and microbial solutions. According to the test requirements, the valves of the matching intermediate containers 402 can be automatically opened to realize long-term stable loading of different types of multiphase fluids. The principle of the multiphase fluid control unit 4 is as follows Fig. 9 The pump body 401 may be an ISCO pump, which further improves the controllability of the multiphase fluid control unit 4 .

[0057] Among them, the multiphase fluid channel 404 is arranged in the pressing block 103, the multiphase fluid channel 404 is a T-shaped channel, and the multiphase fluid channel 404 includes an inlet channel, a contact channel and an outlet channel. The inlet channel is connected to the multi-way valve 403, the contact channel and the outlet channel are both connected to the inlet channel, the outlet of the contact channel is arranged toward the rock mass, and the outlet channel is connected to the external collection container. The multiphase fluid control unit 4 satisfies the requirements of the inflow or outflow of multiphase fluid in the three principal stress directions through the operation of sealing and opening or closing the corresponding valves, eliminates the disadvantages of disassembling the pipeline during the anisotropic permeability measurement, and minimizes the problem of poor sealing caused by human operation.

[0058] The system for reservoir rock engineering geomechanics test of the present invention also includes a digital control unit 5, and the stress control unit 1, the temperature control unit 2 and the multiphase fluid control unit 4 are all connected to the digital control unit 5 in communication. In practical applications, the digital control unit 5 can realize servo closed-loop control of different conditions such as pressure / stress, deformation / strain, temperature, and multiphase fluid based on the software platform, the stress control unit 1, the temperature control unit 2 and the multiphase fluid control unit 4, dynamically adjust the values ​​of loading conditions such as pressure / stress, deformation / strain, temperature and multiphase fluid according to the feedback signal, collect and record the test data, and ensure that the multiphase field coupling test such as high temperature-high pressure-high osmotic pressure-acidic or alkaline multi-ion coexistence-high microbial concentration is stably carried out under preset conditions.

[0059] The system suitable for reservoir rock engineering geomechanics test testing of the present invention utilizes a rigid pressurizing mechanism 101 and a flexible pressurizing mechanism 102, and utilizes a follow-up hydraulic module to perform rigid and flexible pressurization on rock samples. The temperature control unit 2 adopts internal heating, external cooling, and internal and external double-layer insulation. At the same time, anisotropic permeability measurement is performed with the help of a multiphase fluid control unit 4, thereby realizing high-rigidity loading and precise control of the entire process of long-term deformation and instantaneous rupture of the rock mass under high temperature, high pressure, and high permeability pressure.

[0060] Embodiment 2

[0061] This embodiment provides a method suitable for reservoir rock mass engineering geomechanics test testing, using the loading device suitable for reservoir rock mass engineering geomechanics test testing of embodiment 1, including the following steps:

[0062] The rock mass is placed in a space surrounded by six groups of rigid pressurizing mechanisms 101, and the loading driver 105 applies rigid pressure to the rock mass through the pressure head 104 and the pressure block 103; the flexible pressurizing mechanism 102 applies flexible pressure to the rock mass using a pressurized medium;

[0063] The temperature control unit 2 uses a heating mechanism and a cooling mechanism to adjust the temperature so that the rock mass reaches the test temperature condition, and the insulation mechanism is used for heat preservation and insulation of the rock mass.

[0064] The multiphase fluid control unit 4 delivers different fluids to the multiphase fluid channel 404 to achieve simultaneous measurement of the anisotropic permeability of the multiphase fluid in three principal stress directions.

[0065] The digital control unit 5 controls the stress control unit 1, the temperature control unit 2 and the multiphase fluid control unit 4 to realize servo closed-loop control of different conditions such as pressure / stress, deformation / strain, temperature, and multiphase fluid, dynamically adjusts the values ​​of loading conditions such as pressure / stress, deformation / strain, temperature, and multiphase fluid according to the feedback signal, collects and records the test data, and ensures that multiphase field coupling tests such as high temperature, high pressure, high osmotic pressure, coexistence of acidic or alkaline multiple ions, and high microbial concentration are stably carried out under preset conditions.

[0066] The system and method for reservoir rock mass engineering geomechanics test testing of the present invention can effectively meet the test requirements for reservoir rock mass engineering geomechanics behavior under long-term true triaxial loading conditions of high temperature, high pressure and high permeability pressure.

[0067] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system suitable for reservoir rock mass engineering geomechanics test, characterized in that: include: A stress control unit, the stress control unit includes a rigid pressurizing mechanism and a flexible pressurizing mechanism, the rigid pressurizing mechanism includes a pressure block and a pressure head, the pressure block can be pressed against the rock mass, the pressure head is connected to the pressure block, the pressure head can be connected to a loading driver, the number of the rigid pressurizing mechanisms is six, the six groups of the rigid pressurizing mechanisms are surrounded by a rectangular structure and are arranged around the rock mass to apply true triaxial stress to the rock mass; the flexible pressurizing mechanism includes a pressurizing cavity, the pressurizing cavity is connected to an external pressurizing medium source, the external pressurizing medium source can transport pressurizing medium into the pressurizing cavity to apply flexible pressure to the rock mass; A temperature control unit, the temperature control unit comprises a temperature insulation mechanism, a heating mechanism and a cooling mechanism, the temperature insulation mechanism comprises an inner spacer and an outer spacer, the inner spacer is arranged outside the rock mass, the pressing block passes through the inner spacer and abuts against the rock mass; the outer spacer is arranged outside the inner spacer and the pressing block, the pressure head passes through the outer spacer and is connected to the pressing block; the heating mechanism can heat the rock mass; the cooling mechanism can cool the rock mass; A rock sample holder, wherein the rock sample holder is a split structure, and the rock sample holder is arranged outside the outer spacer to fix the stress control unit and the temperature control unit, and the space between the rock sample holder and the pressing block forms the pressurized cavity; The heating mechanism comprises a heating plate, which is arranged in the inner spacer and close to the pressing block. The heating plate can heat the pressurized medium and the pressing block to achieve the purpose of heating the rock mass; the heating plate has a comb-tooth structure.

2. The system suitable for reservoir rock mass engineering geomechanics test according to claim 1, characterized in that: The loading driver is a hydraulic cylinder, and the loading driver is connected to a follow-up hydraulic module. The follow-up hydraulic module includes a motor, an oil pump and a hydraulic oil tank. The output end of the motor is transmission-connected to the oil pump, and the motor can drive the oil pump to rotate. The oil pump is connected to the hydraulic oil tank, and the oil pump is connected to the loading driver via a main oil circuit. The main oil circuit is also connected to a pilot oil circuit, and a pressure differential balancing valve is provided on the pilot oil circuit.

3. The system suitable for reservoir rock mass engineering geomechanics test according to claim 1, characterized in that: The pressurized medium is silicone oil.

4. The system suitable for reservoir rock mass engineering geomechanics test according to claim 1, characterized in that: The refrigeration mechanism comprises a cooling channel, and the cooling channel is arranged inside and outside the rock sample holder, and the cooling channel is connected with an external cooling medium source, and the external cooling medium source transports cooling medium to the cooling channel to realize cooling treatment of the rock mass.

5. The system suitable for reservoir rock mass engineering geomechanics test according to claim 1, characterized in that: The rock mass is covered with a sealing frame, which is a rectangular frame structure, and the pressing block abuts against the sealing frame to seal the rock mass in the space surrounded by the pressing block; The pressing block and the pressing head both have a test channel for installing a test probe, and a sealing ring is arranged in the test channel; a positioning pin is arranged between the pressing head and the pressing block.

6. The system for reservoir rock mass engineering geomechanics test according to any one of claims 1 to 5, characterized in that: It also includes a multiphase fluid control unit, which includes an intermediate container, a multi-way valve and a multiphase fluid channel. The intermediate container can accommodate multiple fluids. The intermediate container is connected to the rock sample holder by the multi-way valve, and the intermediate container is also connected to a pump body. The multiphase fluid channel is arranged in the pressure block. The multiphase fluid channel is a T-shaped channel. The multiphase fluid channel includes an inlet channel, a contact channel and an outlet channel. The inlet channel is connected to the multi-way valve, and the contact channel and the outlet channel are both connected to the inlet channel. The outlet of the contact channel is arranged toward the rock mass, and the outlet channel is connected to an external collection container.

7. The system for reservoir rock mass engineering geomechanics test according to claim 6, characterized in that: It also includes a digital control unit, and the stress control unit, the temperature control unit and the multiphase fluid control unit are all communicatively connected to the digital control unit.

8. A method suitable for reservoir rock mass engineering geomechanics test, characterized in that: The system for reservoir rock mass engineering geomechanics test according to any one of claims 1 to 7 comprises the following steps: The rock mass is placed in a space surrounded by six groups of the rigid pressurizing mechanisms, the loading driver applies rigid pressure to the rock mass through the pressure head and the pressure block; the flexible pressurizing mechanism applies flexible pressure to the rock mass using a pressurized medium; The temperature control unit uses the heating mechanism and the cooling mechanism to adjust the temperature so that the rock mass reaches the test temperature condition, and the insulation mechanism is used for heat preservation and insulation of the rock mass.

Images