Rock stratum simulation test device for alternating injection and production of gas storage of depleted gas reservoir

Abstract

The invention relates to the technical field of gas storages, in particular to a rock stratum simulation test device for alternating injection and production of a gas storage of an exhausted gas reservoir, which comprises a fixed test frame, a storage sleeve, a gas storage tank and a gas storage tank, and the plurality of storage sleeves are circumferentially and uniformly arranged in the middle of the sample storage rack in a surrounding manner. According to the invention, a plurality of core samples can be tested at the same time by adopting the unit test cylinders in modular design, so that the test efficiency is greatly improved, the continuous test function is also realized, the test period is effectively shortened, and when a long-term injection-production process needs to be simulated, the waiting time can be remarkably shortened, and the test efficiency is improved. And more test data can be obtained in the same time period.

Description

Technical Field

[0001] The invention relates to the technical field of gas storage, and in particular to a rock formation simulation test device for alternating injection and production of a depleted gas reservoir gas storage. Background Art

[0002] With the development of the global economy and the adjustment of the energy structure, the demand for natural gas, as a clean and efficient energy source, continues to grow. In order to meet the growing demand for natural gas and cope with seasonal or sudden imbalances in supply and demand, underground gas storage has become an important natural gas storage facility. Depleted gas reservoirs are regarded as ideal types of underground gas storage due to their natural geological structure and good sealing performance. In the process of using depleted gas reservoirs as gas storage, alternating injection and production is one of the common operating modes. However, during the alternating injection and production process, that is, frequent injection and production of natural gas, the physical and mechanical properties of the reservoir will change, which directly affects the long-term stability and safety of the gas storage.

[0003] The study on alternating injection and production of gas storage facilities in depleted gas reservoirs requires special rock simulation test equipment to conduct experiments to test and evaluate the physical and mechanical properties of the reservoir during repeated injection and extraction of natural gas, so as to ensure the safety and reliability of the gas storage facilities. However, in the current simulation test, the interval between injection and extraction of natural gas in actual gas storage facilities is relatively long, because gas storage facilities are mainly used to balance the seasonal supply and demand differences of natural gas. Therefore, a complete round of gas injection and production cycle of gas storage facilities is relatively long, often reaching several months or even a year, resulting in a long test cycle. The current test equipment generally has a pre-set fixed connection structure for the pipeline, and only one core test position is set. However, in reality, in order to ensure the representativeness and reliability of the data, a large number of samples are usually required for testing, so the test is very time-consuming, and multiple test equipment are required to test at the same time to obtain the required sample volume within the unit test time. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a rock formation simulation test device for alternating injection and production of a depleted gas reservoir, so as to solve the problem that when performing alternating injection and production simulation tests on core samples, the pipeline of the equipment is fixed and only one core sample can be tested at the same time. When data of multiple samples need to be obtained, they must be tested one by one, resulting in a long test cycle.

[0005] Based on the above purpose, the present invention provides a rock formation simulation test device for alternating injection and production of a depleted gas reservoir, including a fixed test frame, which is rotatably connected to a sample storage frame, and also includes: a storage sleeve and a unit test cylinder nested and slidably arranged inside the storage sleeve, a plurality of storage sleeves are evenly arranged in a circle around the middle of the sample storage frame, a filling port is provided at both the upper and lower ends of the unit test cylinder, and a core test chamber is provided inside the unit test cylinder; a port sealing cover is provided in the middle of the filling port, a central delivery pipe is provided at the center of the port sealing cover, and the outer end of the central delivery pipe is connected to the injection and production port; the injection and production port A delivery one-way valve is provided in the middle of the port, a conical connecting port is provided inside the delivery one-way valve, a conical valve core is slidably embedded in the middle of the conical connecting port, and a sealing spring is connected in the middle of the conical valve core; a lifting guide frame is provided at the center of the fixed test frame, and the upper and lower sides of the lifting guide frame are symmetrically vertically slidably connected with unit injection and production frames, and the middle of the unit injection and production frame is connected with an injection and production delivery pipe, and an injection and production interface is provided at the outer end of the injection and production delivery pipe, and the injection and production interface and the injection and production port are arranged in coordination with each other, a switch top pressure rod is connected in the middle of the injection and production interface, and a booster delivery pump is connected to the other end of the injection and production delivery pipe.

[0006] The inner side surface of the filling port is surrounded by a closing thread, and the outer side surface of the port sealing cover is surrounded by a connecting thread. The port sealing cover is detachably connected to the filling port via the connecting thread and the closing thread.

[0007] A spiral guide groove is provided in the middle of the side wall of the storage sleeve, and a spiral guide block is provided in the middle of the outer wall of the unit test cylinder. The spiral guide groove and the spiral guide block are matched with each other, and a locking slot is provided in the middle of the spiral guide block. An elastic locking block is horizontally slidably provided in the middle of the spiral guide groove, and the elastic locking block and the locking slot are matched with each other. An unlocking lever is connected to the outer end of the elastic locking block.

[0008] A storage chip is installed in the middle of the unit test cylinder, a storage contact is arranged on the top of the outer wall of the unit test cylinder, a read-write contact is arranged on the top of the inner wall of the storage sleeve, and the storage contact and the read-write contact are arranged in coordination with each other.

[0009] A confining pressure interlayer is arranged around the middle of the side wall of the unit test cylinder, a flexible spacer sleeve is arranged between the confining pressure interlayer and the core test chamber, a confining pressure pressurization port is arranged at the top of the confining pressure interlayer, a delivery one-way valve is also arranged in the middle of the confining pressure pressurization port, a confining pressure interface is arranged in the middle of the unit injection and production frame in a corresponding connection, the confining pressure interface and the confining pressure pressurization port are arranged corresponding to each other, and a switch top pressure rod is arranged in the middle of the confining pressure interface.

[0010] An axial pressure clamp is provided on the inner side of the port sealing cover, a connecting delivery pipe is connected to the center of the axial pressure clamp, the outer end of the connecting delivery pipe is nested and slidably arranged on the inner side of the central delivery pipe, a sliding sealing ring is arranged around the edge of the axial pressure clamp, an axial pressure port is connected and arranged through the middle of the port sealing cover, a delivery one-way valve is also arranged in the middle of the axial pressure port, an axial pressure interface is correspondingly connected in the middle of the unit injection and production frame, the axial pressure interface and the axial pressure port are arranged correspondingly to each other, a switch top pressure rod is arranged in the middle of the axial pressure interface, and the outer ends of the confining pressure interface and the axial pressure interface are independently connected with a hydraulic delivery pump and a hydraulic pressure gauge.

[0011] A center guide sleeve is provided at the center of the lifting guide frame, a lifting screw is provided in the middle of the center guide sleeve, a screw motor is provided at the axial end of the lifting screw, a center connecting column is symmetrically nested and slidably provided on the upper and lower sides of the inner side of the center guide sleeve, a lifting screw sleeve is provided at the center of the center connecting column, the center connecting column is connected to the lifting screw through the lifting screw sleeve, and the lifting screw drives the center connecting columns symmetrically provided on the upper and lower sides to move synchronously in opposite directions through the lifting screw sleeve.

[0012] Two unit injection and collection racks are connected to the central connecting column. A rotating connecting ring is provided at one end of the unit injection and collection rack close to the central connecting column. The unit injection and collection rack is rotatably connected to the central connecting column through the rotating connecting ring. When the unit injection and collection rack rotates along the central connecting column through the rotating connecting ring, it passes through multiple unit test cylinders loaded and set on the sample storage rack in sequence.

[0013] An adjusting toothed ring is arranged around the middle of the rotating connecting ring, an adjusting gear is arranged on the outer side of the adjusting toothed ring in meshing connection, an adjusting motor is connected to the shaft end of the adjusting gear, and the adjusting motor is fixedly connected to the central connecting column.

[0014] The beneficial effects of the present invention are as follows: the present invention can test multiple core samples at the same time by adopting a modularly designed unit test cylinder, thereby greatly improving the test efficiency. Multiple unit test cylinders can be tested independently, and the sample storage rack can drive the unit test cylinders loaded thereon to pass between the unit injection and production racks in sequence. The unit injection and production racks are connected to the unit test cylinders through a lifting mechanism, thereby realizing the function of continuous testing and effectively shortening the test cycle. In particular, when it is necessary to simulate a long-term injection and production process, the waiting time can be significantly reduced, which means that more test data can be obtained in the same time period, reducing the time required for testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required to be used in the embodiments or the description of the prior art are briefly introduced below.

[0016] Figure 1 It is a front structural schematic diagram of an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the bottom structure of an embodiment of the present invention;

[0018] Figure 3 It is a structural schematic diagram of a fixed test stand according to an embodiment of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of a sample storage rack according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic structural diagram of a central connecting column according to an embodiment of the present invention;

[0021] Figure 6 It is a structural schematic diagram of a storage sleeve according to an embodiment of the present invention;

[0022] Figure 7 It is a structural schematic diagram of a unit test cartridge according to an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the internal structure of a unit test cartridge according to an embodiment of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of a port sealing cover according to an embodiment of the present invention;

[0025] Fig.10 It is a schematic structural diagram of a unit injection and production rack according to an embodiment of the present invention.

[0026] The markings in the figure are:

[0027] 1. Fixed test rack; 101. Rotating gear; 102. Rotating motor; 103. Sample storage rack; 104. Rotating gear ring; 105. Storage sleeve; 106. Spiral guide groove; 107. Elastic locking block; 108. Unlocking lever; 109. Read-write contact; 2. Unit test cylinder; 201. Spiral guide block; 202. Locking slot; 203. Filling port; 204. Closed thread; 205. Core test chamber; 206. Confining pressure interlayer; 207. Flexible spacer sleeve; 208. Confining pressure pressurization port; 209. Storage chip; 210. Storage contact; 3. Port sealing cover; 301. Connecting thread; 302. Central delivery pipe; 303. Injection and production port; 304. Axial pressurization port; 4. Delivery check valve; 401. Conical connecting port; 402. Conical valve core; 403, sealing spring; 5, axial pressure clamp; 501, sliding sealing ring; 502, connecting delivery pipe; 6, lifting guide frame; 601, center guide sleeve; 602, lifting screw; 603, screw motor; 604, center connecting column; 605, lifting screw sleeve; 606, adjusting gear; 607, adjusting motor; 7, unit injection and production frame; 701, rotating connecting ring; 702, adjusting gear ring; 703, injection and production delivery pipe; 704, injection and production pressure gauge; 705, injection and production flow meter; 8, injection and production interface; 801, confining pressure interface; 802, axial pressure interface; 803, switch top pressure rod; 804, hydraulic delivery pump; 805, hydraulic pressure gauge; 9, booster delivery pump; 901, injection and production three-way valve; 902, connecting delivery pipe; 903, storage tank. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0029] like Figure 1-10As shown, a rock formation simulation test device for alternating injection and production of a depleted gas reservoir gas storage facility comprises a fixed test frame 1, a sample storage frame 103 is rotatably connected in the middle of the fixed test frame 1, and further comprises: a storage sleeve 105 and a unit test cylinder 2 which is nested, slidably and detachably arranged inside the storage sleeve 105, a plurality of storage sleeves 105 are uniformly arranged in a circle around the middle of the sample storage frame 103; the sample storage frame 103 is loaded with a plurality of unit test cylinders 2 simultaneously through the storage sleeve 105, a filling port 203 is arranged at both the upper and lower ends of the unit test cylinder 2, a core test chamber 205 is arranged inside the unit test cylinder 2; a port sealing cover 3 is detachably connected in the middle of the filling port 203, the filling port 203 is kept closed by the port sealing cover 3, a central conveying pipe 302 is arranged at the center of the port sealing cover 3, The outer end of the central delivery pipe 302 is connected to an injection port 303; the middle of the injection port 303 is connected to a delivery check valve 4, the interior of the delivery check valve 4 is provided with a conical connecting port 401, the middle of the conical connecting port 401 is slidably provided with a conical valve core 402, and the middle connection of the conical valve core 402 is provided with a sealing spring 403; the center of the fixed test frame 1 is connected to a lifting guide frame 6, and the upper and lower sides of the lifting guide frame 6 are symmetrically vertically slidably connected with unit injection frames 7, and the middle connection of the unit injection frame 7 is provided with an injection delivery pipe 703, and the outer end of the injection delivery pipe 703 is provided with an injection interface 8, and the injection interface 8 and the injection port 303 are mutually coordinated. A switch top pressure rod 803 is provided in the middle connection of the injection interface 8, and the other end of the injection delivery pipe 703 is connected with a booster delivery pump 9.

[0030] In this embodiment, the device adopts a modularly designed unit test cylinder 2, and the sample storage rack 103 is loaded with multiple unit test cylinders 2 through the storage sleeve 105, so that multiple core samples can be tested at the same time, which greatly improves the test efficiency. The unit test cylinder 2 can be filled with corresponding core samples through the filling port 203, and is sealed by the port sealing cover 3 to maintain an internal closed test environment. When testing, the rotating motor 102 drives the rotating gear ring 104 surrounding the outer side of the sample storage rack 103 through the rotating gear 101 connected to the shaft end, thereby driving the sample storage rack 103 to rotate. The sample storage rack 103 can drive the unit test cylinder 2 loaded thereon to rotate synchronously, and pass through the unit injection racks 7 symmetrically arranged up and down in sequence, and can move up and down. At this time, the unit injection rack 7 can be close to the top and bottom of the corresponding unit test cylinder 2, so that the injection port 303 on the central delivery pipe 302 is connected to the injection interface 8. At this time, the booster delivery pump 9 can deliver the stored natural gas from the top central delivery pipe 302 to the unit test cylinder 2, and extract the gas and water from the bottom central delivery pipe 302, and the injection pressure gauge is connected to the injection delivery pipe 703. 704 and the injection and production flowmeter 705 are used to record and adjust according to the detection data to realize the storage of natural gas, or to extract the natural gas stored in the core of the unit test tube 2 from the top central delivery pipe 302, and at the same time, water is injected from the bottom central delivery pipe 302 to realize gas drive, so as to simulate the process of injecting and extracting natural gas in the depleted gas reservoir gas storage. In addition, since a delivery check valve 4 is correspondingly arranged in the middle of the injection and production port 303, the delivery check valve 4 is embedded in the conical connecting port 401 through the conical valve core 402 to realize one-way input, and a switch top pressure rod 803 is arranged in the middle of the injection and production interface 8. When the injection and production interface 8 is connected to the injection and production port 303, When connected to each other, the switch pressing rod 803 also synchronously presses the conical valve core 402 to disengage the conical connecting port 401, thereby facilitating the reverse output of internal water vapor and realizing the self-sealing function. After a unit test cylinder 2 injects or extracts natural gas, the next unit test cylinder 2 can be moved between the unit injection and production racks 7 symmetrically arranged up and down by rotating the sample storage rack 103, thereby realizing the function of continuous testing and effectively shortening the test cycle. Especially when it is necessary to simulate a long-term injection and production process, it can significantly reduce the waiting time and the time required for testing.

[0031] like Figure 6-7As shown, the inner side surface of the filling port 203 of the device of the present invention is surrounded by a closed thread 204, and the outer side surface of the port sealing cover 3 is surrounded by a connecting thread 301. The port sealing cover 3 is detachably connected to the filling port 203 through the connecting thread 301 and the closed thread 204, so as to quickly open and close the filling port 203 and load and unload the core. At the same time, the unit test tube 2 is nested and slidably detachably arranged on the inner side of the storage sleeve 105. When loading, the spiral guide groove 106 and the spiral guide block 201 are matched with each other to facilitate the positioning and buffering of the unit test tube 2 when sliding and installing from top to bottom. When the unit test tube 2 is slidably engaged and installed in place, the elastic locking block 107 can be embedded in the locking groove 202 to lock the unit test tube 2. The unlocking lever 108 drives the elastic locking block 107 to disengage the locking groove 202, so that the unit test tube 2 can be unlocked and disassembled, thereby facilitating the loading and unloading of the unit test tube 2, so as to realize the testing of more core samples, which is beneficial to improving the testing efficiency. rate, and a storage chip 209 is installed in the middle of the unit test cylinder 2, a storage contact 210 is provided on the top of the outer wall of the unit test cylinder 2, and a read-write contact 109 is provided on the top of the inner wall of the storage sleeve 105. The storage contact 210 and the read-write contact 109 are arranged in cooperation with each other, so that when the unit test cylinder 2 is fitted into the storage sleeve 105, the storage contact 210 and the read-write contact 109 are in contact and connected with each other, and the storage chip 209 is connected to the control computer set by the device through the storage contact 210 and the read-write contact 109, and each detection device and power equipment of the device are controlled by the control computer. Through the control computer, various values ​​of the corresponding unit test cylinder 2, such as pressure, storage gas volume, storage time, etc., can be written and stored in the storage chip 209, which is convenient for marking and recording the unit test cylinder 2. When the stored unit test cylinder 2 is reloaded into the storage sleeve 105, the unit test cylinder 2 can be tested and operated according to the data, which is conducive to improving the convenience and accuracy of the simulation test.

[0032] like Figure 8-10As shown, the unit test cylinder 2 of the device of the present invention is correspondingly provided with a confining pressure and axial pressure simulation structure, a confining pressure interlayer 206 is arranged around the middle of the side wall of the unit test cylinder 2, a flexible spacing sleeve 207 is arranged between the confining pressure interlayer 206 and the core test chamber 205, a confining pressure pressurization port 208 is arranged at the top of the confining pressure interlayer 206, and a confining pressure interface 801 is correspondingly connected in the middle of the unit injection and production frame 7. When the unit injection and production frame 7 is lifted and lowered to be correspondingly connected with the unit test cylinder 2, the confining pressure interface 801 and the confining pressure pressurization port 208 are correspondingly connected to each other, and the delivery one-way valve 4 also arranged in the middle of the confining pressure pressurization port 208 is opened by the switch top pressure rod 803 arranged in the middle of the confining pressure interface 801, so as to adjust and control the confining pressure of the corresponding unit test cylinder 2 through the hydraulic delivery pump 804 and the hydraulic pressure gauge 805, and at the same time, an axial pressure clamp 5 is arranged on the inner side of the port sealing cover 3, and a connecting delivery pipe 502 is connected at the center of the axial pressure clamp 5. The outer end of the tube 502 is nested and slidably arranged on the inner side of the central delivery tube 302, and a sliding sealing ring 501 is arranged around the edge of the axial pressure clamp 5 to facilitate maintaining closure. An axial pressure port 304 is arranged through the middle of the port sealing cover 3, and a delivery check valve 4 is also arranged in the middle of the axial pressure port 304. Therefore, when the lifting and lowering are correspondingly connected with the unit test cylinder 2, the axial pressure interface 802 and the axial pressure port 304 are correspondingly connected to each other, and the delivery check valve 4 also arranged in the middle of the axial pressure port is opened by the switch push rod 803 arranged in the middle of the axial pressure interface 802, so as to adjust and control the axial pressure of the corresponding unit test cylinder 2 through the hydraulic delivery pump 804 and the hydraulic pressure gauge 805, thereby realizing pressure adjustment, so that each unit test cylinder 2 can independently simulate the corresponding confining pressure and axial pressure, allowing multiple samples to be tested simultaneously under the same conditions, or tests under different conditions within the same test cycle, thereby enhancing the flexibility of the test.

[0033] like Figure 4-5 As shown, a central guide sleeve 601 is provided at the center of the lifting guide frame 6 of the device, a lifting screw 602 is connected in the middle of the central guide sleeve 601, a screw motor 603 is connected to the axial end of the lifting screw 602, and a central connecting column 604 is symmetrically nested and slidably provided on the upper and lower sides of the inner side of the central guide sleeve 601, and a lifting screw sleeve 605 is provided at the center of the central connecting column 604. The central connecting column 604 is connected to the lifting screw 602 through the lifting screw sleeve 605. The lifting screw 602 drives the central connecting columns 604 symmetrically arranged on the upper and lower sides to move synchronously in the opposite direction through the lifting screw sleeve 605, and two unit injection and extraction frames 7 are connected to the central connecting column 604, which can drive the unit injection and extraction frames 7 to move synchronously, so as to realize the adjustment and injection of the unit test cylinder 2.

[0034] like Figure 4-5 and Fig.10As shown, two unit injection racks 7 are connected and arranged on the central connecting column 604 of the device, and a linkage structure is arranged between the two unit injection racks 7. An injection three-way valve 901 is arranged between the injection and production delivery pipe 703 and the booster delivery pump 9. The injection and production delivery pipe 703 and the booster delivery pump 9 are connected to each other through the injection three-way valve 901. The other end of the injection and production three-way valve 901 is connected and arranged with a connecting delivery pipe 902. The outer end of the connecting delivery pipe 902 is connected and arranged with a storage tank 903. Natural gas and water can be stored in the storage tanks 903 connected and arranged on the unit injection racks 7 on the upper and lower sides respectively. The pipelines connected to the injection and production interface 8, the confining pressure interface 801 and the axial pressure interface 802 are all flexible telescopic hose structures, which are convenient for the unit injection and production racks 7 to be adjusted up and down and rotated, so that any one of the units can be adjusted by controlling and adjusting the injection and production three-way valve 901. The injection and production delivery pipe 703 in the middle of the injection and production rack 7 is interconnected with the storage tank 903 through two injection and production three-way valves 901 and the booster delivery pump 9, so that the booster delivery pump 9 can deliver the natural gas or water stored in the storage tank 903 to the unit test cylinder 2 connected to the corresponding unit injection and production rack 7, or extract the natural gas or water stored in the unit test cylinder 2 and store it in the storage tank 903, so as to realize the injection and production of the corresponding unit test cylinder 2. At the same time, the injection and production delivery pipes 703 in the middle of the two unit injection and production racks 7 can also be interconnected through the two injection and production three-way valves 901 and the booster delivery pump 9. At this time, the natural gas or water stored in the unit test cylinder 2 connected to one unit injection and production rack 7 can be extracted and synchronously pumped and pressed into the unit test cylinder 2 connected to another unit injection and production rack 7, so as to realize the synchronous injection and production of a pair of unit test cylinders 2, which is conducive to further shortening the experimental period.

[0035] like Figure 4-5 As shown, a rotating connection ring 701 is provided at one end of the unit injection rack 7 of the device close to the central connection column 604, and the unit injection rack 7 is rotatably connected to the central connection column 604 through the rotating connection ring 701. When the unit injection rack 7 rotates along the central connection column 604 through the rotating connection ring 701, it passes through multiple unit test cylinders 2 loaded and set on the sample storage rack 103 in sequence. An adjusting tooth ring 702 is arranged around the middle of the rotating connection ring 701, and an adjusting gear 606 is arranged on the outer side of the adjusting tooth ring 702 in meshing connection. An adjusting motor 607 is connected to the shaft end of the adjusting gear 606. The adjusting motor 607 is fixedly connected to the central connection column 604, so that the adjusting motor 607 can drive the rotating connection ring 701 to rotate through the adjusting gear 606 and the adjusting tooth ring 702, thereby driving the unit injection rack 7 to move, so as to adjust the relative position and angle of the two unit injection racks 7, and realize the synchronous linkage adjustment operation of any two unit test cylinders 2, so as to facilitate the adjustment of the test steps and cycles, which is conducive to improving the flexibility of the experiment.

[0036] When in use, first connect the corresponding pipeline of the device, then fill the corresponding core sample through the filling port 203, and screw the port sealing cover 3 into the filling port 203 through the connecting thread 301 and the closing thread 204 to seal it, then slide the unit test tube 2 by the unit test tube 2, and when the unit test tube 2 is slidably fitted into place, the elastic locking block 107 can be embedded in the locking groove 202 to lock the unit test tube 2, and when the unit test tube 2 is slidably fitted into place, the elastic locking block 107 can be embedded in the locking groove 202 to lock the unit test tube 2, and when the test is performed, the rotating motor 102 is rotated by The rotating gear 101 connected to the shaft end drives the rotating gear ring 104 surrounding the outer side of the sample storage rack 103, thereby driving the sample storage rack 103 to rotate. At this time, the sample storage rack 103 can drive the unit test tube 2 loaded thereon to rotate synchronously, and pass through the unit injection racks 7 symmetrically arranged above and below in sequence, and then the central connecting column 604 is connected to the lifting screw 602 through the lifting screw sleeve 605. The lifting screw 602 drives the central connecting columns 604 symmetrically arranged on the upper and lower sides to move synchronously in the opposite direction through the lifting screw sleeve 605. Two unit injection racks 7 are connected to the central connecting column 604, which can drive the unit injection racks 7 to move synchronously. At this time, the unit injection racks 7 can The top and bottom ends of the corresponding unit test tube 2 are close to each other, so that the injection port 303 on the central delivery pipe 302 is connected to the injection interface 8. When the injection interface 8 is connected to the injection port 303, the switch pressing rod 803 also presses the conical valve core 402 synchronously to make the conical valve core 402 disengage from the open conical connecting port 401, so as to facilitate the reverse output of the internal water and gas. At this time, the booster delivery pump 9 delivers the stored natural gas from the top central delivery pipe 302 to the unit test tube 2, and extracts the gas and water from the bottom central delivery pipe 302 to realize the storage of natural gas, or extracts the natural gas stored in the core of the unit test tube 2 from the top central delivery pipe 302. At the same time, water is injected from the central delivery pipe 302 at the bottom to realize gas drive, so as to simulate the process of injecting and extracting natural gas from the gas storage reservoir of the depleted gas reservoir in the formation. After a unit test tube 2 injects or extracts natural gas, when the injection and production interface 8 is connected to the injection and production port 303, the switch pressing rod 803 also presses the conical valve core 402 synchronously to make the conical valve core 402 disengage from the open conical connecting port 401, thereby facilitating the reverse output of internal water and gas, and resetting by reverse movement. The injection and production port 303 is separated from the injection and production interface 8, and then the next unit test tube 2 is moved between the unit injection and production racks 7 symmetrically arranged above and below through the rotation of the sample storage rack 103, thereby realizing continuous testing.

[0037] The discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rock formation simulation test device for alternating injection and production of a depleted gas reservoir, comprising a fixed test frame (1), wherein the fixed test frame (1) is rotatably connected to a sample storage frame (103), characterized in that: Also includes: A storage sleeve (105) and a unit test tube (2) nested and slidably arranged inside the storage sleeve (105); a plurality of storage sleeves (105) are evenly arranged in a circle around the middle of a sample storage rack (103); a filling port (203) is arranged at both the upper and lower ends of the unit test tube (2); a core test chamber (205) is arranged inside the unit test tube (2); a port sealing cover (3) is arranged in the middle of the filling port (203); a central delivery pipe (302) is arranged at the center of the port sealing cover (3); an injection and production port (303) is connected to the outer end of the central delivery pipe (302); a delivery check valve (4) is arranged in the middle of the injection and production port (303); a conical connecting port (401) is arranged inside the delivery check valve (4) A conical valve core (402) is slidably engaged in the middle of the conical connecting port (401), and a sealing spring (403) is connected in the middle of the conical valve core (402); a lifting guide frame (6) is provided at the center of the fixed test frame (1), and a unit injection frame (7) is symmetrically and vertically slidably connected to the upper and lower sides of the lifting guide frame (6), and an injection delivery pipe (703) is connected in the middle of the unit injection frame (7), and an injection interface (8) is provided at the outer end of the injection delivery pipe (703), and the injection interface (8) and the injection port (303) are arranged to cooperate with each other, and a switch top pressure rod (803) is connected in the middle of the injection interface (8), and a booster delivery pump (9) is connected to the other end of the injection delivery pipe (703).

2. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 1 is characterized in that: The inner side surface of the filling port (203) is surrounded by a closed thread (204), and the outer side surface of the port sealing cover (3) is surrounded by a connecting thread (301). The port sealing cover (3) is detachably connected to the filling port (203) via the connecting thread (301) and the closed thread (204).

3. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 1 is characterized in that: A spiral guide groove (106) is arranged in the middle of the side wall of the storage sleeve (105); a spiral guide block (201) is arranged in the middle of the outer wall of the unit test cylinder (2); the spiral guide groove (106) and the spiral guide block (201) are arranged in cooperation with each other; a locking groove (202) is arranged in the middle of the spiral guide block (201); an elastic locking block (107) is arranged in the middle of the spiral guide groove (106) for horizontal sliding; the elastic locking block (107) and the locking groove (202) are arranged in cooperation with each other; and an unlocking lever (108) is connected to the outer end of the elastic locking block (107).

4. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 1 is characterized in that: A storage chip (209) is installed in the middle of the unit test cylinder (2), a storage contact (210) is arranged on the top of the outer wall of the unit test cylinder (2), and a read-write contact (109) is arranged on the top of the inner wall of the storage sleeve (105), and the storage contact (210) and the read-write contact (109) are arranged to cooperate with each other.

5. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 1, characterized in that: A confining pressure interlayer (206) is arranged around the middle of the side wall of the unit test tube (2), a flexible spacer sleeve (207) is arranged between the confining pressure interlayer (206) and the core test chamber (205), a confining pressure pressurization port (208) is arranged at the top of the confining pressure interlayer (206), a delivery check valve (4) is arranged in the middle of the confining pressure pressurization port (208), a confining pressure interface (801) is arranged in the middle of the unit injection and production frame (7), the confining pressure interface (801) and the confining pressure pressurization port (208) are arranged correspondingly to each other, and a switch top pressure rod (803) is arranged in the middle of the confining pressure interface (801).

6. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 5 is characterized in that: An axial pressure clamp (5) is arranged on the inner side of the port sealing cover (3), a connecting delivery pipe (502) is connected to the center of the axial pressure clamp (5), the outer end of the connecting delivery pipe (502) is nested and slidably arranged on the inner side of the central delivery pipe (302), a sliding sealing ring (501) is arranged around the edge of the axial pressure clamp (5), an axial pressure port (304) is connected to the middle of the port sealing cover (3), and the axial pressure port (304) is connected to the inner side of the central delivery pipe (302). ) is also provided in the middle of the unit injection and production frame (7); an axial pressure interface (802) is correspondingly connected in the middle of the unit injection and production frame (7); the axial pressure interface (802) and the axial pressure port (304) are arranged correspondingly to each other; a switch top pressure rod (803) is provided in the middle of the axial pressure interface (802); and the outer ends of the confining pressure interface (801) and the axial pressure interface (802) are independently connected with a hydraulic delivery pump (804) and a hydraulic pressure gauge (805).

7. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 1, characterized in that: A central guide sleeve (601) is arranged at the center of the lifting guide frame (6), a lifting screw rod (602) is connected in the middle of the central guide sleeve (601), a screw motor (603) is connected to the axial end of the lifting screw rod (602), a central connecting column (604) is symmetrically nested and slidably arranged on the upper and lower sides of the inner side of the central guide sleeve (601), a lifting screw sleeve (605) is arranged at the center of the central connecting column (604), the central connecting column (604) is connected to the lifting screw rod (602) through the lifting screw sleeve (605), and the lifting screw rod (602) drives the central connecting columns (604) symmetrically arranged on the upper and lower sides to move synchronously in the opposite direction through the lifting screw sleeve (605).

8. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 7, characterized in that: Two unit injection racks (7) are connected to the central connecting column (604). A rotating connection ring (701) is provided at one end of the unit injection rack (7) close to the central connecting column (604). The unit injection rack (7) is rotatably connected to the central connecting column (604) via the rotating connection ring (701). When the unit injection rack (7) rotates along the central connecting column (604) via the rotating connection ring (701), it passes through a plurality of unit test cylinders (2) loaded and arranged on the sample storage rack (103) in sequence.

9. The rock formation simulation test device for alternating injection and production of a depleted gas reservoir according to claim 8, characterized in that: An adjusting toothed ring (702) is disposed around the middle of the rotating connecting ring (701), an adjusting gear (606) is disposed on the outer side of the adjusting toothed ring (702) in meshing connection, an adjusting motor (607) is connected to the shaft end of the adjusting gear (606), and the adjusting motor (607) is fixedly connected to the central connecting column (604).

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