A rock layer simulation test device for alternative injection and production in a depleted gas reservoir gas storage

Abstract

The present invention relates to the technical field of gas storage reservoirs, and particularly to a rock formation simulation test device for alternative injection and production in depleted gas reservoir gas storage reservoirs, including a fixed test stand, and a sample storage rack is rotatably connected in the middle of the fixed test stand. It further includes: storage sleeves, and a plurality of storage sleeves are evenly arranged in a circumferential manner around the middle of the sample storage rack. By adopting the modular designed unit test cylinders, the present invention can simultaneously test multiple core samples, greatly improving the test efficiency. At the same time, it also realizes the function of continuous testing, effectively shortening the test cycle. When it is necessary to simulate the long-term injection and production process, the waiting time can be significantly reduced, and more test data can be obtained within the same time period.

Description

Technical Field

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

[0002] With the development of the global economy and the adjustment of the energy structure, natural gas, as a clean and efficient energy source, has a continuously growing demand. To meet the increasing demand for natural gas and to address seasonal or sudden supply-demand imbalances, underground gas storage reservoirs have become important natural gas storage facilities. Due to their natural geological structure and good sealing performance, depleted gas reservoirs are regarded as ideal types of underground gas storage reservoirs. During the process of using depleted gas reservoirs as gas storage reservoirs, alternate injection and production is one of the common operation modes. However, during the alternate injection and production process, that is, when injecting and producing natural gas frequently, the physical and mechanical properties of the reservoir will change, which directly affects the long-term stability and safety of the gas storage reservoir.

[0003] For the research on alternate injection and production of depleted gas reservoir gas storage reservoirs, a special rock layer simulation test device is needed to conduct experiments to test and evaluate the physical and mechanical properties of the reservoir during the process of repeatedly injecting and extracting natural gas, in order to ensure the safety and reliability of the gas storage reservoir. However, during the current simulation tests, the interval time for injecting and extracting natural gas in real gas storage reservoirs is relatively long. Because gas storage reservoirs are mainly used to balance the seasonal supply-demand differences of natural gas, therefore, a complete injection and production cycle of a gas storage reservoir is relatively long, often reaching several months or even a year, resulting in a long test cycle. And generally, the pipelines of the current test equipment are of a pre-set fixed connection structure, with only one core test position set. However, in reality, to ensure the representativeness and reliability of the data, a large number of samples are usually required for testing. So, when conducting tests, it is very time-consuming, and multiple test equipment need to be used simultaneously to obtain the required sample size within the unit test time. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a rock layer simulation test device for alternate injection and production in depleted gas reservoir gas storage reservoirs, so as to solve the problem that when conducting alternate injection and production simulation tests on core samples currently, the pipelines of the equipment are fixed, and only one core sample can be tested simultaneously. When data of multiple samples need to be obtained, they must be tested one by one, resulting in an excessively long test cycle.

[0005] For the above purposes, the present invention provides a rock layer simulation test device for alternative injection and production in an exhausted gas reservoir gas storage, including a fixed test rack, the fixed test rack is rotationally connected to a sample storage rack, and further 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 circular shape around the middle of the sample storage rack. Both the upper and lower ends of the unit test cylinder are provided with filling ports, and a core test chamber is arranged inside the unit test cylinder; a port sealing cover is arranged in the middle of the filling port, a central delivery pipe is arranged at the center of the port sealing cover, and the outer end of the central delivery pipe is connected to an injection-production port; a delivery check valve is arranged in the middle of the injection-production port, a conical communication port is arranged inside the delivery check valve, a conical valve core is slidably fitted in the middle of the conical communication port, and a sealing spring is connected to the middle of the conical valve core; a lifting guide frame is arranged at the center of the fixed test rack, unit injection-production frames are symmetrically and vertically slidably connected to both the upper and lower sides of the lifting guide frame, an injection-production delivery pipe is connected to the middle of the unit injection-production frame, an injection-production interface is arranged at the outer end of the injection-production delivery pipe, the injection-production interface is cooperatively arranged with the injection-production port, a switch pressing rod is connected to the middle of the injection-production interface, and the other end of the injection-production delivery pipe is connected to a booster delivery pump.

[0006] A closed thread is arranged around the inner side surface of the filling port, a connecting thread is arranged around the outer side surface of the port sealing cover, and the port sealing cover is detachably connected to the filling port through the connecting thread and the closed thread.

[0007] A spiral guide groove is arranged in the middle of the side wall of the storage sleeve, a spiral guide block is arranged in the middle of the outer wall of the unit test cylinder, the spiral guide groove is cooperatively arranged with the spiral guide block, a locking card slot is arranged in the middle of the spiral guide block, an elastic locking block is horizontally slidably arranged in the middle of the spiral guide groove, the elastic locking block is cooperatively arranged with the locking card slot, and 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 at the top of the outer wall of the unit test cylinder, a reading and writing contact is arranged at the top of the inner wall of the storage sleeve, and the storage contact is cooperatively arranged with the reading and writing contact.

[0009] A confining pressure interlayer is arranged around the middle of the side wall of the unit test cylinder, a flexible spacer is arranged between the confining pressure interlayer and the core test chamber, a confining pressure pressurizing port is arranged at the top of the confining pressure interlayer, a delivery check valve is also arranged in the middle of the confining pressure pressurizing port, a confining pressure interface is correspondingly connected to the middle of the unit injection-production frame, the confining pressure interface is correspondingly arranged with the confining pressure pressurizing port, and a switch pressing rod is arranged in the middle of the confining pressure interface.

[0010] An axial pressure clamping plate is arranged on the inner side of the port sealing cover. A connecting conveying pipe is connected and arranged at the center of the axial pressure clamping plate. The outer end of the connecting conveying pipe is nested and slidably arranged inside the central conveying pipe. A sliding sealing ring is arranged around the edge of the axial pressure clamping plate. An axial pressure port is connected and arranged through the middle of the port sealing cover. A conveying one-way valve is also arranged in the middle of the axial pressure port. An axial pressure interface is correspondingly connected and arranged in the middle of the unit injection-production frame. The axial pressure interface and the axial pressure port are correspondingly arranged with each other. A switch push rod is arranged in the middle of the axial pressure interface. Hydraulic conveying pumps and hydraulic pressure gauges are independently connected and arranged at the outer ends of the confining pressure interface and the axial pressure interface.

[0011] A central guide sleeve is arranged at the center of the lifting guide frame. A lifting screw rod is connected and arranged in the middle of the central guide sleeve. A screw rod motor is connected to the shaft end of the lifting screw rod. Central connecting columns are symmetrically nested and slidably arranged on the upper and lower sides inside the central guide sleeve. A lifting screw sleeve is arranged at the center of the central connecting column. The central connecting column is connected to the lifting screw rod through the lifting screw sleeve. The lifting screw rod drives the symmetrically arranged central connecting columns on the upper and lower sides to move synchronously and reversely through the lifting screw sleeve.

[0012] Two unit injection-production frames are connected and arranged on the central connecting column. A rotating connecting ring is arranged at one end of the unit injection-production frame close to the central connecting column. The unit injection-production frame is rotationally connected to the central connecting column through the rotating connecting ring. When the unit injection-production frame rotates along the central connecting column through the rotating connecting ring, it sequentially passes through a plurality of unit test cylinders loaded on the sample storage rack.

[0013] An adjusting gear ring is arranged around the middle of the rotating connecting ring. An adjusting gear is meshed and connected to the outer side of the adjusting gear ring. An adjusting motor is connected to the shaft end of the adjusting gear. The adjusting motor is fixedly connected to the central connecting column.

[0014] Advantages of the present invention: By adopting the modular designed unit test cylinders, the present invention can simultaneously test multiple core samples, greatly improving the test efficiency. The multiple unit test cylinders can be independently tested. And the sample storage rack can drive the unit test cylinders loaded thereon to sequentially pass between the unit injection-production frames. The unit injection-production frame is docked with the unit test cylinders through the lifting mechanism, realizing the function of continuous testing, effectively shortening the test cycle. Especially when it is necessary to simulate the long-term injection-production process, it can significantly reduce the waiting time, which means that more test data can be obtained within the same time period and the time required for testing is reduced. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0016] Figure 1 Schematic diagram of the front structure of the embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the bottom structure of the embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the fixed test stand of the embodiment of the present invention;

[0019] Figure 4 Schematic diagram of the structure of the sample storage rack of the embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the structure of the central connecting column of the embodiment of the present invention;

[0021] Figure 6 Schematic diagram of the structure of the storage sleeve of the embodiment of the present invention;

[0022] Figure 7 Schematic diagram of the structure of the unit test cylinder of the embodiment of the present invention;

[0023] Figure 8 Schematic diagram of the internal structure of the unit test cylinder of the embodiment of the present invention;

[0024] Figure 9 Schematic diagram of the structure of the port sealing cover of the embodiment of the present invention;

[0025] Figure 10 Schematic diagram of the structure of the unit injection and production rack of the embodiment of the present invention.

[0026] The labels in the figure are:

[0027] 1. Fixed test stand; 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. Reading and writing contact; 2. Unit test cylinder; 201. Spiral guide block; 202. Locking card slot; 203. Filling port; 204. Sealing thread; 205. Core test chamber; 206. Confining pressure interlayer; 207. Flexible spacer sleeve; 208. Confining pressure pressurizing 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 pressurizing port; 4. Delivery check valve; 401. Conical communication 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. Central guide sleeve; 602. Lifting screw; 603. Screw motor; 604. Central 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 flowmeter; 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. Boosting delivery pump; 901. Injection and production three-way valve; 902. Connecting delivery pipe; 903. Storage tank. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with specific embodiments.

[0029] As Figure 1-10As shown in the figure, a rock layer simulation test device for alternating injection and production in a depleted gas reservoir storage includes a fixed test stand 1. A sample storage rack 103 is rotatably connected in the middle of the fixed test stand 1. It also includes: a storage sleeve 105 and a unit test cylinder 2 that is nested, slidable and detachable inside the storage sleeve 105. A plurality of storage sleeves 105 are evenly arranged in a circular shape around the middle of the sample storage rack 103. The sample storage rack 103 loads and sets a plurality of unit test cylinders 2 through the storage sleeves 105 at the same time. Filling ports 203 are provided 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 to the middle of the filling port 203. The filling port 203 is kept closed through the port sealing cover 3. A central delivery pipe 302 is provided at the center of the port sealing cover 3. The outer end of the central delivery pipe 302 is connected with an injection-production port 303. A delivery check valve 4 is connected to the middle of the injection-production port 303. A conical communication port 401 is arranged inside the delivery check valve 4. A conical valve core 402 is slidably fitted inside the conical communication port 401. A sealing spring 403 is connected to the middle of the conical valve core 402. A lifting guide frame 6 is connected to the center of the fixed test stand 1. Unit injection-production frames 7 are symmetrically and vertically slidably connected to the upper and lower sides of the lifting guide frame 6. An injection-production delivery pipe 703 is connected to the middle of the unit injection-production frame 7. An injection-production interface 8 is arranged at the outer end of the injection-production delivery pipe 703. The injection-production interface 8 and the injection-production port 303 are cooperatively arranged. A switch top pressure rod 803 is connected to the middle of the injection-production interface 8. The other end of the injection-production delivery pipe 703 is connected with a booster delivery pump 9.

[0030] In this embodiment, the device adopts a modularized unit test cylinder 2, and the sample storage rack 103 can load and set multiple unit test cylinders 2 through the storage sleeve 105 at the same time, enabling the testing of multiple core samples simultaneously, greatly improving the testing 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 a closed internal testing environment. When conducting tests, the rotating motor 102 drives the rotating gear ring 104 surrounding the outside of the sample storage rack 103 through the rotating gear 101 connected to the shaft end, thereby driving the rotation of the sample storage rack 103. At this time, the sample storage rack 103 can drive the unit test cylinders 2 loaded thereon to rotate synchronously and pass successively between the upper and lower symmetrically arranged unit injection and production racks 7, and can move up and down. At this time, the unit injection and production rack 7 can approach the top and bottom of the corresponding unit test cylinder 2, so that the injection and production ports 303 on the central delivery pipe 302 are connected to the injection and production interfaces 8. At this time, the booster delivery pump 9 can deliver stored natural gas into the unit test cylinder 2 from the central delivery pipe 302 at the top and extract the gas and moisture therein from the central delivery pipe 302 at the bottom. Moreover, a pressure gauge 704 and a flowmeter 705 for injection and production are connected to the injection and production delivery pipe 703 to adjust according to the detected data records, realizing the storage of natural gas, or extracting the natural gas stored in the core in the unit test cylinder 2 from the central delivery pipe 302 at the top, and injecting water from the central delivery pipe 302 at the bottom at the same time to achieve gas drive, so as to simulate the process of injecting and extracting natural gas in a depleted gas reservoir storage. And since a delivery check valve 4 is correspondingly arranged in the middle of the injection and production port 303, the delivery check valve 4 realizes one-way input through the conical valve core 402 being embedded in the conical communication port 401. And a switch top pressure rod 803 is connected 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, the switch top pressure rod 803 also synchronously presses the conical valve core 402, so that the conical valve core 402 disengages and opens the conical communication port 401, facilitating the reverse output of the internal water and gas, and at the same time facilitating the realization of 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 upper and lower symmetrically arranged unit injection and production racks 7 through the rotation of the sample storage rack 103, thus realizing the function of continuous testing, effectively shortening the testing 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] As Figure 6-7As shown in the figure, a sealing thread 204 is circumferentially arranged on the inner side of the filling port 203 of the device of the present invention, and a connecting thread 301 is circumferentially arranged on the outer side of the port sealing cover 3. The port sealing cover 3 is detachably connected to the filling port 203 through the connecting thread 301 and the sealing thread 204, so as to quickly open and close the filling port 203 for loading and unloading the core. At the same time, the unit test cylinder 2 is nested, slidably and detachably arranged inside the storage sleeve 105. When loading, the spiral guiding groove 106 and the spiral guiding block 201 are arranged in cooperation with each other, which is convenient for positioning and buffering when the unit test cylinder 2 is slidably installed from top to bottom. And when the unit test cylinder 2 is slidably and fitted in place, the elastic locking block 107 can be inserted into the locking slot 202 to lock the unit test cylinder 2. By driving the elastic locking block 107 to disengage from the locking slot 202 through the unlocking lever 108, the unit test cylinder 2 can be unlocked and disassembled, so as to facilitate the loading and unloading of the unit test cylinder 2 to realize the testing of more core samples, which is beneficial to improving the testing efficiency. And a storage chip 209 is installed in the middle of the unit test cylinder 2, a storage contact 210 is arranged at the top of the outer wall of the unit test cylinder 2, and a reading and writing contact 109 is arranged at the top of the inner wall of the storage sleeve 105. The storage contact 210 and the reading and writing contact 109 are arranged in cooperation with each other. Thus, when the unit test cylinder 2 is fitted and installed into the storage sleeve 105, the storage contact 210 and the reading and writing contact 109 are in contact and connected with each other, and the storage chip 209 is connected to the control computer set in the device through the storage contact 210 and the reading and writing contact 109. And each detection device and power device of the device are controlled by the control computer. Through the control computer, various values of the unit test cylinder 2, such as pressure, stored 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 reinstalled into the storage sleeve 105, the unit test cylinder 2 can be tested and operated according to the data, which is beneficial to improving the convenience and accuracy of the simulation test.

[0032] As Figure 8-10As shown in the figure, 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 sandwich layer 206 is arranged around the middle of the side wall of the unit test cylinder 2. A flexible spacer sleeve 207 is arranged between the confining pressure sandwich layer 206 and the core test chamber 205. A confining pressure pressurizing port 208 is arranged at the top end of the confining pressure sandwich layer 206. 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 pressurizing port 208 are correspondingly connected to each other, and the conveying check valve 4 arranged in the middle of the confining pressure pressurizing port 208 is opened by the switch pressing 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 conveying pump 804 and the hydraulic pressure gauge 805. At the same time, an axial pressure clamping plate 5 is arranged inside the port sealing cover 3. A connecting conveying pipe 502 is connected at the center of the axial pressure clamping plate 5. The outer end of the connecting conveying pipe 502 is nested and slidably arranged inside the central conveying pipe 302. A sliding sealing ring 501 is arranged around the edge of the axial pressure clamping plate 5 to facilitate keeping it closed. An axial pressurizing port 304 is connected through the middle of the port sealing cover 3. A conveying check valve 4 is also arranged in the middle of the axial pressurizing port 304. Thus, when it is lifted and lowered to be correspondingly connected with the unit test cylinder 2, the axial pressure interface 802 and the axial pressurizing port 304 are correspondingly connected to each other, and the conveying check valve 4 arranged in the middle of the axial pressurizing port is opened by the switch pressing 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 conveying pump 804 and the hydraulic pressure gauge 805, thereby realizing the adjustment of the pressure. Thus, 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 to be carried out within the same test cycle, enhancing the flexibility of the test.

[0033] As Figure 4-5 shown, a central guide sleeve 601 is arranged at the center of the lifting guide frame 6 of the device. A lifting screw rod 602 is connected in the middle of the central guide sleeve 601. A screw rod motor 603 is connected to the shaft end of the lifting screw rod 602. Central connecting columns 604 are symmetrically nested and slidably arranged on the upper and lower sides inside 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. The lifting screw rod 602 drives the symmetrically arranged central connecting columns 604 on the upper and lower sides to move synchronously and reversely through the lifting screw sleeve 605. Two unit injection and production frames 7 are connected to the central connecting column 604, and thus the unit injection and production frames 7 can be driven to move synchronously to realize the adjustment and injection / production of the unit test cylinder 2.

[0034] As Figure 4-5 and Figure 10As shown, two unit injection and production frames 7 are connected to the central connection column 604 of the device. A linkage structure is arranged between the two unit injection and production frames 7. A injection-production three-way valve 901 is arranged between the injection-production delivery pipe 703 and the booster delivery pump 9. The injection-production delivery pipe 703 and the booster delivery pump 9 are connected to each other through the injection-production three-way valve 901. The other end of the injection-production three-way valve 901 is connected with a connecting delivery pipe 902. The outer end of the connecting delivery pipe 902 is connected with a storage tank 903. Natural gas and water can be respectively stored in the storage tanks 903 connected to the upper and lower unit injection and production frames 7. The pipes connected to the injection-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 up-and-down and rotational adjustment of the unit injection and production frame 7. Thus, by controlling and adjusting the injection-production three-way valve 901, the injection-production delivery pipe 703 in the middle of any one of the unit injection and production frames 7 can be interconnected with the storage tank 903 through two injection-production three-way valves 901 and the booster delivery pump 9, facilitating the booster delivery pump 9 to transport 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 frame 7, or to pump out the natural gas or water stored in the unit test cylinder 2 and store it in the storage tank 903 to realize the injection and production work of the corresponding unit test cylinder 2. At the same time, the injection-production delivery pipes 703 in the middle of the two unit injection and production frames 7 can be connected to each other through two injection-production three-way valves 901 and the booster delivery pump 9. At this time, while pumping out the natural gas or water stored in the unit test cylinder 2 connected to one unit injection and production frame 7, it can be synchronously pumped and pressured into the unit test cylinder 2 connected to the other unit injection and production frame 7 to realize the synchronous injection and production of a pair of unit test cylinders 2, which is beneficial to further shortening the experimental period.

[0035] As Figure 4-5 shown, a rotary connection ring 701 is arranged at one end of the unit injection and production frame 7 of the device close to the central connection column 604. The unit injection and production frame 7 is rotationally connected to the central connection column 604 through the rotary connection ring 701. When the unit injection and production frame 7 rotates along the central connection column 604 through the rotary connection ring 701, it sequentially passes through a plurality of unit test cylinders 2 loaded on the sample storage rack 103. An adjustment gear ring 702 is arranged around the middle of the rotary connection ring 701. An adjustment gear 606 is meshed and connected to the outside of the adjustment gear ring 702. The shaft end of the adjustment gear 606 is connected with an adjustment motor 607. The adjustment motor 607 is fixedly connected to the central connection column 604. Thus, the adjustment motor 607 can drive the rotary connection ring 701 to rotate through the adjustment gear 606 and the adjustment gear ring 702, and then drive the unit injection and production frame 7 to move to adjust the relative position and angle of the two unit injection and production frames 7, realize the synchronous linkage adjustment operation of any two unit test cylinders 2, and further facilitate the adjustment of the test steps and cycle, which is beneficial to improving the flexibility of the experiment.

[0036] In use, first connect the corresponding pipelines of the device. Then, fill the corresponding core samples 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 and install the unit test cylinder 2. When the unit test cylinder 2 is slid and fitted in place, the elastic locking block 107 can be inserted into the locking slot 202 to lock the unit test cylinder 2. When the unit test cylinder 2 is slid and fitted in place, the elastic locking block 107 can be inserted into the locking slot 202 to lock the unit test cylinder 2. When conducting a test, the rotating motor 102 drives the rotating gear ring 104 surrounding the outside of the sample storage rack 103 through the rotating gear 101 connected to the shaft end, thereby driving the rotation of the sample storage rack 103. At this time, the sample storage rack 103 can drive the unit test cylinder 2 loaded thereon to rotate synchronously and successively pass between the unit injection and production racks 7 symmetrically arranged up and down. Then, the central connecting column 604 is connected to the lifting screw 602 through the lifting nut 605. The lifting screw 602 drives the central connecting columns 604 symmetrically arranged on the upper and lower sides to move synchronously and in opposite directions through the lifting nut 605. Two unit injection and production racks 7 are connected to the central connecting column 604, so that the unit injection and production racks 7 can be driven to move synchronously. At this time, the unit injection and production racks 7 can approach the top and bottom of the corresponding unit test cylinder 2, so that the injection and production ports 303 on the central delivery pipe 302 are connected to the injection and production interfaces 8. 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, so that the conical valve core 402 is disengaged to open the conical communication port 401, thereby facilitating the reverse output of the internal water and gas. At this time, the booster delivery pump 9 conveys stored natural gas into the unit test cylinder 2 from the central delivery pipe 302 at the top and pumps out the gas and water from it through the central delivery pipe 302 at the bottom to achieve the storage of natural gas, or pumps out the natural gas stored in the core in the unit test cylinder 2 from the central delivery pipe 302 at the top, and injects water from the central delivery pipe 302 at the bottom at the same time to achieve gas drive, so as to simulate the process of injecting and extracting natural gas in a depleted gas reservoir in the formation. After a unit test cylinder 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, so that the conical valve core 402 is disengaged to open the conical communication port 401, thereby facilitating the reverse output of the internal water and gas. Move back in the reverse direction, separate the injection and production port 303 from the injection and production interface 8, and then through the rotation of the sample storage rack 103, move the next unit test cylinder 2 between the unit injection and production racks 7 symmetrically arranged up and down, thus realizing continuous testing.

[0037] The discussion of any of the above embodiments is merely 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 shall be included within the scope of protection of the present invention.

Claims

1. A rock formation simulation test device for alternating injection and production in an exhausted gas reservoir gas storage, comprising a fixed test rack (1), the fixed test rack (1) being rotatably connected to a sample storage rack (103), characterized in that, It further includes: A storage sleeve (105) and a unit test cylinder (2) nested and slidably arranged inside the storage sleeve (105). A plurality of storage sleeves (105) are evenly arranged in a circular shape around the middle of the sample storage rack (103). Both the upper and lower ends of the unit test cylinder (2) are provided with filling ports (203), and a core test chamber (205) is arranged inside the unit test cylinder (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), and the outer end of the central delivery pipe (302) is connected with an injection and production port (303); a delivery check valve (4) is arranged in the middle of the injection and production port (303), a conical communication port (401) is arranged inside the delivery check valve (4), a conical valve core (402) is slidably fitted in the middle of the conical communication port (401), and a sealing spring (403) is connected in the middle of the conical valve core (402); a lifting guide frame (6) is arranged at the center of the fixed test frame (1), unit injection and production frames (7) are symmetrically and vertically slidably connected to both the upper and lower sides of the lifting guide frame (6), an injection and production delivery pipe (703) is connected in the middle of the unit injection and production frame (7), an injection and production interface (8) is arranged at the outer end of the injection and production delivery pipe (703), the injection and production interface (8) and the injection and production port (303) are cooperatively arranged, a switch pressing rod (803) is connected in the middle of the injection and production interface (8), and the other end of the injection and production delivery pipe (703) is connected with a booster delivery pump (9).

2. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir gas storage described in claim 1, wherein A closed thread (204) is arranged around the inner side surface of the filling port (203), a connecting thread (301) is arranged around the outer side surface of the port sealing cover (3), and the port sealing cover (3) is detachably connected to the filling port (203) through the connecting thread (301) and the closed thread (204).

3. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir gas storage reservoir according to claim 1, wherein 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 cooperatively arranged, a locking card slot (202) is arranged in the middle of the spiral guide block (201), an elastic locking block (107) is horizontally slidably arranged in the middle of the spiral guide groove (106), the elastic locking block (107) and the locking card slot (202) are cooperatively arranged, 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 alternative injection and production in a depleted gas reservoir gas storage as claimed in claim 1, wherein A storage chip (209) is installed in the middle of the unit test cylinder (2), a storage contact (210) is arranged at the top of the outer wall of the unit test cylinder (2), a reading and writing contact (109) is arranged at the top of the inner wall of the storage sleeve (105), and the storage contact (210) and the reading and writing contact (109) are cooperatively arranged.

5. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir storage described in claim 1, characterized in that, An intermediate portion of the side wall of the unit test cylinder (2) is provided with a confining pressure interlayer (206) in a surrounding manner. A flexible spacer sleeve (207) is provided between the confining pressure interlayer (206) and the core test chamber (205). The top end of the confining pressure interlayer (206) is provided with a confining pressure pressurizing port (208). A conveying check valve (4) is provided in the middle of the confining pressure pressurizing port (208). A confining pressure interface (801) is correspondingly connected and arranged in the middle of the unit injection and production frame (7). The confining pressure interface (801) and the confining pressure pressurizing port (208) are correspondingly arranged with each other. A switch pressing rod (803) is provided in the middle of the confining pressure interface (801).

6. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir storage described in claim 5, characterized in that, An axial pressure clamping plate (5) is provided inside the port sealing cover (3). A connecting conveying pipe (502) is connected and arranged at the center of the axial pressure clamping plate (5). The outer end of the connecting conveying pipe (502) is nested and slidably arranged inside the central conveying pipe (302). A sliding sealing ring (501) is provided in a surrounding manner at the edge of the axial pressure clamping plate (5). An axial pressure pressurizing port (304) is connected and arranged through the middle of the port sealing cover (3). A conveying check valve (4) is also provided in the middle of the axial pressure pressurizing port (304). An axial pressure interface (802) is correspondingly connected and arranged in the middle of the unit injection and production frame (7). The axial pressure interface (802) and the axial pressure pressurizing port (304) are correspondingly arranged with each other. A switch pressing rod (803) is provided in the middle of the axial pressure interface (802). Hydraulic conveying pumps (804) and hydraulic pressure gauges (805) are independently connected and arranged at the outer ends of the confining pressure interface (801) and the axial pressure interface (802).

7. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir gas storage as claimed in claim 1, wherein, A central guide sleeve (601) is provided at the center of the lifting guide frame (6). A lifting screw rod (602) is connected and arranged in the middle of the central guide sleeve (601). A screw rod motor (603) is connected to the shaft end of the lifting screw rod (602). Central connecting columns (604) are symmetrically nested and slidably arranged on the upper and lower sides inside the central guide sleeve (601). 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 rod (602) through the lifting screw sleeve (605). The lifting screw rod (602) drives the symmetrically arranged central connecting columns (604) on the upper and lower sides to move synchronously and in opposite directions through the lifting screw sleeve (605).

8. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir gas storage as claimed in claim 7, wherein Two unit injection and production frames (7) are connected and arranged on the central connecting column (604). A rotating connecting ring (701) is provided at one end of the unit injection and production frame (7) close to the central connecting column (604). The unit injection and production frame (7) is rotationally connected to the central connecting column (604) through the rotating connecting ring (701). When the unit injection and production frame (7) rotates along the central connecting column (604) through the rotating connecting ring (701), it sequentially passes through a plurality of unit test cylinders (2) loaded and arranged on the sample storage rack (103).

9. The rock formation simulation test device for alternative injection and production in a depleted gas reservoir gas storage described in claim 8, characterized in that, An adjustment gear ring (702) is disposed around the middle of the rotary connection ring (701). An adjustment gear (606) is meshed and connected to the outer side of the adjustment gear ring (702). The shaft end of the adjustment gear (606) is connected with an adjustment motor (607), and the adjustment motor (607) is fixedly connected to the central connection column (604).

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