A shale gas generating device capable of preventing instant spouting of high-pressure valve and a method of using the same

Abstract

The application discloses a shale gas generating device capable of preventing instant spouting of a high-pressure valve and a use method thereof, which comprises a horizontal base, a fixing frame is fixedly installed at the top of the horizontal base, a supporting frame is fixedly installed at the top of the horizontal base and located at the back of the fixing frame, a placing plate is slidably connected to the inner wall of the supporting frame, a reaction cylinder is fixedly installed at the top of the placing plate, a copper conduit is fixedly installed at the outer surface of the reaction cylinder, a system pressure gauge is fixedly installed at the outer surface of the copper conduit, and an adapter is fixedly installed at the tail end of the copper conduit. The sleeve joint of the adapter and the measuring cylinder is connected through the plug-in pipe, the position of the through hole on the plug-in pipe corresponds to the butt joint of the adapter and the measuring cylinder, when the butt joint leaks gas when the gas output is impacted, the excessive gas pressure causes the sealing film to break, so that the gas enters the collecting bin along with the broken sealing film, the collecting bin is enlarged, and then the gas is collected.

Description

Technical Field

[0001] This invention relates to the field of shale gas generation technology, specifically to a shale gas generation device and its usage method that can prevent instantaneous ejection from high-pressure valves. Background Technology

[0002] Under geological conditions, the system in which shale generates and expels hydrocarbons changes with the evolution of its burial history. During deep burial, shale hydrocarbon generation occurs in a closed system, with the generated hydrocarbons mainly stored in the shale strata. However, during strata uplift, some oil and gas in the shale layers may leak, and shale hydrocarbon generation occurs in a semi-open system. Shale may transform between closed and semi-open systems during hydrocarbon generation. Currently, shale hydrocarbon generation simulation experimental devices either use a closed system, such as a closed system based on gold tubes or quartz / glass tubes, or a semi-open system.

[0003] Patent document CN109100259A discloses a shale gas generation and analysis device, comprising: "a generation and collection module and a control and processing module; the generation and collection module includes a reaction vessel, an oil-gas separator, a gas collection tank, a first pipeline, and a second pipeline; a temperature sensor is installed inside the reaction vessel, and a heating jacket is installed outside the reaction vessel; the reaction vessel is connected to the oil-gas separator through the first pipeline, a first pressure sensor is installed on the first pipeline, and two high-pressure valves are connected in series on the first pipeline, the two high-pressure valves being located between the first pressure sensor and the oil-gas separator; there is a gap between the two high-pressure valves; the oil-gas separator is connected to one end of the second pipeline, and the other end of the second pipeline is connected to several gas distribution pipes, the end of each gas distribution pipe being connected to a gas collection tank; a second pressure sensor is installed on the second pipeline; a low-pressure valve is installed on each gas distribution pipe; the control and processing module includes a control module, a data analysis module, and a display module; the control module is connected to the heating jacket for controlling the heating time and heating temperature of the heating jacket; the data analysis module is connected to the first pressure sensor and the second pipeline." The system includes a force sensor, a second pressure sensor, and a temperature sensor, used to acquire gas pressure information collected by the first and second pressure sensors and reactor temperature information acquired by the temperature sensor, which are then analyzed. A display module connected to the data analysis module displays the gas pressure information and reactor temperature information. Furthermore, the system uses a control module to control the heating jacket to heat the sample in the reactor using an air bath, allowing for precise temperature control and obtaining desorption gas pressure data of core samples under different geological temperature conditions. There is no upper limit to the heating temperature, avoiding the problem of temperature limits in traditional water bath heating. Simultaneously, it acquires gas pressure information through a pressure sensor and then calculates the desorption gas content and other characteristics of the core sample through the data analysis module, resulting in accurate and reliable data. Moreover, it connects the generation, storage, and desorption processes of shale gas in a closed system, thus linking shale gas composition, shale reservoir characteristics, and shale gas desorption processes, providing good research integrity. It is also easy to operate, as the gas is always protected during transfer, eliminating problems such as sample contamination due to improper sample transfer.

[0004] Patent document CN105604881A discloses a shale gas extraction device, comprising: "an electromagnetic coil and a magnetic field controller are installed inside its protective shell; a foot is fixed to the lower side of the outer surface of the protective shell; the electromagnetic coil is fixed to the lower side of the outer surface of the pressurization shell, and the lower end of the pressurization shell is fixed to the lower end inside the protective shell; a tubular shaft-type outlet valve, an inlet valve, a power spring, and a magnetic piston are installed inside the pressurization shell; the lower end of the tubular shaft-type outlet valve passes through the central hole at the upper end of the pressurization shell and then through the power spring and the magnetic piston; the inlet valve is installed on the annular inner step at the inner end of the inlet hole and cooperates with the transverse surface of the annular inner step to seal or open the channel for shale gas to enter. The shale gas extraction device has a compact structure, small size, high power, strong power, high efficiency in extracting shale gas, and low power consumption."

[0005] However, when the above-mentioned device is in use, the gas valve structure is an important gas emission structure in the device. When the gas valve is opened, since its main function is to output gas, when the gas valve releases the high-pressure gas in the device instantly, it will impact the output pipe structure connected to it, which can easily lead to accidental gas leakage. Therefore, there is a lack of suitable protective structure. Summary of the Invention

[0006] The purpose of this invention is to provide a shale gas generation device and its usage method that can prevent instantaneous ejection of high-pressure valves, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a shale gas generation device and its method of use that can prevent instantaneous ejection of high-pressure valves, comprising a horizontal base, a fixing frame fixedly installed on the top of the horizontal base, a support frame fixedly installed on the top of the horizontal base, and the support frame being located on the back of the fixing frame.

[0008] A placement plate is slidably connected to the inner wall of the support frame. A reaction cylinder is fixedly installed on the top of the placement plate. A copper conduit is fixedly installed on the outer surface of the reaction cylinder. A system pressure gauge is fixedly installed on the outer surface of the copper conduit. An adapter is fixedly installed at the tail end of the copper conduit. Gas valves are provided on the outer surface of the copper conduit between the system pressure gauge and the adapter, and at the tail end of the adapter. A positioning ring is sleeved on the outer surface of the copper conduit. A positioning rod is fixedly installed at the bottom of the positioning ring. A sliding rod is slidably connected inside the positioning rod. Limit clamps are fixedly installed on the bottom of the front of both the positioning rod and the sliding rod. The bottoms of the two sets of gas valves on the copper conduit are each sleeved with... The rubber tube has a limit rod installed on the top of the horizontal base, and the limit rod is located on the back of the vacuum pump. Two sets of snap rings are fixedly installed on the outer surface of the limit rod. A measuring cylinder is snapped into the inside of the snap ring, and the top of the measuring cylinder is connected to an adapter. A connector is sleeved on the outer surface of the adapter, and the top of the measuring cylinder is inserted into the inside of the connector. A connecting tube is fixedly installed on the outer surface of the connector. A sealing membrane is installed on the inner wall of the connecting tube. A collection chamber is provided on the outer side of the sealing membrane. A through hole is opened inside the connector, and the through hole communicates with the sealing membrane. A limit groove is opened on the outer surface of the connecting tube, and the collection chamber is located inside the limit groove.

[0009] In some possible implementations, a jack is fixedly mounted on the top of the horizontal base, and the jack is located directly below the support frame.

[0010] In some possible implementations, a vacuum pump is fixedly mounted on the top of the horizontal base, and the vacuum pump is located on the back of the support frame, with the tail end of the rubber tube connected to the top of the vacuum pump.

[0011] In some possible implementations, a connecting rod is mounted on the top of the horizontal base, a connecting ring is sleeved on the outer surface of the connecting rod, a liquid collector is snapped into the inside of the connecting ring, and a pressure reducing valve is fixedly mounted on the top of the outer surface of the copper conduit.

[0012] In some possible implementations, a connecting pipe is fixedly installed at the bottom of the measuring cylinder, and the tail end of the connecting pipe is connected to the bottom of the liquid collector.

[0013] In some possible implementations, control bolts are threaded through both sides of the limiting clamp, and a positioning clamp is rotatably connected to the front end of the control bolt. A limiting slider is provided on the outer surface of the positioning clamp, and the limiting slider is slidably connected to the inner wall of the limiting clamp.

[0014] In some possible implementations, a connecting plate is fixedly installed on the inner wall of the fixing frame, a high-sensitivity temperature controller is fixedly installed on the top of the connecting plate, and an electric furnace is provided on the outer surface of the reaction cylinder.

[0015] In some possible implementations, a power block is fixedly installed inside the connecting tube, the output end of the power block is electrically connected to an electric heating element, and the electric heating element is interconnected with the through hole. A power line is provided on the outer surface of the power block, and a sealing cap is threadedly connected to the outer surface of the collection chamber.

[0016] In some possible implementations, the method for preventing instantaneous injection of high-pressure valves is as follows:

[0017] Step S1: The jack on the horizontal base can apply external pressure to the system. It has high sensitivity, large range, and good constant pressure effect. The measuring cylinder inside the snap ring is connected to the adapter. The measuring cylinder is used to calibrate the gas content and collect the gas. A pressure reducing valve is fixedly installed on the top of the outer surface of the copper conduit. The pressure reducing valve can be set to a certain pressure value. If the pressure is exceeded, the gas will be released to the outside, which protects the system and can adjust the internal pressure of the system. A connecting pipe is fixedly installed at the bottom of the measuring cylinder. The connecting pipe is used for drainage and gas collection. A connecting plate is fixedly installed on the inner wall of the fixed frame. The high-sensitivity temperature controller has good temperature control and constant temperature effect. An electric furnace is set on the outer surface of the reaction cylinder. The use of the electric furnace is used to heat the system quickly.

[0018] Step S2: When the device is generating shale gas, the rubber tube and the gas valve at the gas outlet will be connected and installed. The positioning ring on the sliding copper guide tube will then drive the positioning rod to slide. The sliding rod can be adjusted inside the positioning rod, and the positions of the positioning rod and the sliding rod can be adjusted. In use, the distance between the limiting clamp and the rubber tube can be adjusted by the sliding property of the positioning ring.

[0019] Step S3: When in use, the limiting clamp can be slid close to the rubber tube. By sliding the positioning ring and adjusting the sliding between the sliding rod and the positioning rod, the limiting clamp can be sleeved on the outer surface of the rubber tube. By rotating the control bolt, the rotation between the control bolt and the positioning clamp can be pushed to clamp the rubber tube.

[0020] Step S4: The position of the through hole on the connector corresponds to the joint between the adapter and the measuring cylinder. When the gas output is impacted and gas leakage occurs at the joint, the excessive gas pressure causes the sealing membrane to rupture, allowing the gas to enter the collection chamber along with the ruptured sealing membrane. This causes the collection chamber to expand, thereby collecting the gas.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention uses a connecting pipe to connect the measuring cylinder and the adapter. The position of the through hole on the connecting pipe corresponds to the docking point of the adapter and the measuring cylinder. When gas output is impacted and gas leakage occurs at the docking point, the excessive gas pressure causes the sealing membrane to rupture, allowing gas to enter the collection chamber with the rupture of the sealing membrane, thereby amplifying the collection chamber and collecting the gas.

[0023] This invention uses a power block to drive the heating element to maintain the heat of the gas flowing through the through hole and the liquid in the gas, preventing cooling blockage at the through hole and maintaining its efficient unblocking function. Furthermore, the material collected inside can be collected and utilized by rotating the sealing cover to open it. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the positioning ring structure of the present invention;

[0026] Figure 3 This is a side view of the copper conduit structure of the present invention;

[0027] Figure 4 This is a cross-sectional schematic diagram of the positioning rod structure of the present invention;

[0028] Figure 5 This is a cross-sectional schematic diagram of the insertion tube structure of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0030] Figure 7 This is a cross-sectional schematic diagram of the limiting clamp structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the collection chamber structure of the present invention;

[0032] The components are as follows: 1-Horizontal base, 2-Fixing frame, 3-Support frame, 4-Placement plate, 5-Reaction cylinder, 6-Copper conduit, 7-System pressure gauge, 8-Adapter, 9-Gas valve, 10-Positioning ring, 11-Positioning rod, 12-Sliding rod, 13-Limiting clamp, 14-Rubber tube, 15-Insertion pipe, 16-Connecting pipe, 17-Sealing membrane, 18-Collection chamber, 19-Through hole, 20-Limiting groove, 21-Jack, 22-Vacuum pump, 23-Limiting rod, 24-Snap-fit ​​ring, 25-Measuring cylinder, 26-Connecting rod, 27-Connecting ring, 28-Liquid collector, 29-Pressure reducing valve, 30-Connecting pipe, 31-Control bolt, 32-Positioning clamp, 33-Limiting slider, 34-Connecting plate, 35-Temperature controller, 36-Electric furnace, 37-Power supply block, 38-Electric heating element, 39-Power cord, 40-Sealing cover. Detailed Implementation

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 :

[0035] A shale gas generation device and its method of use that prevents instantaneous high-pressure valve ejection include a horizontal base 1, a fixing frame 2 fixedly mounted on the top of the horizontal base 1, a support frame 3 fixedly mounted on the top of the horizontal base 1, and the support frame 3 located behind the fixing frame 2. A placement plate 4 is slidably connected to the inner wall of the support frame 3. A reaction cylinder 5 is fixedly mounted on the top of the placement plate 4. A copper conduit 6 is fixedly mounted on the outer surface of the reaction cylinder 5. A system pressure gauge 7 is fixedly mounted on the outer surface of the copper conduit 6. An adapter 8 is fixedly mounted at the tail end of the copper conduit 6. The outer surface of the copper conduit 6 is located between the system pressure gauge 7 and the adapter 8, and between the adapter 8 and the system pressure gauge 7. Gas valves 9 are provided at the tail end of the copper conduit 6. A positioning ring 10 is sleeved on the outer surface of the copper conduit 6. A positioning rod 11 is fixedly installed at the bottom of the positioning ring 10. A sliding rod 12 is slidably connected inside the positioning rod 11. Limiting clamps 13 are fixedly installed at the bottom of the front of the positioning rod 11 and the sliding rod 12. Rubber tubes 14 are sleeved at the bottom of the two sets of gas valves 9 on the copper conduit 6. Insertion tubes 15 are sleeved on the outer surface of the two sets of gas valves 9 on the copper conduit 6. The top of the rubber tube 14 is inserted into the inside of the insertion tube 15. A limiting groove 20 is opened on the outer surface of the connecting tube 16. The collection chamber 18 is located inside the limiting groove 20.

[0036] When the device is generating shale gas, the positioning ring 10 on the sliding copper conduit 6 can be slidable, which in turn drives the positioning rod 11 to slide. The sliding rod 12 can be slidably adjusted inside the positioning rod 11, and the positions of the positioning rod 11 and the sliding rod 12 can be slid. After the rubber tube 14 is installed and connected to the gas valve 9, the limiting clamp 13 is sleeved on the outer surface of the rubber tube 14. After the measuring cylinder 25 and the adapter 8 are sleeved and installed, the position of the through hole 19 on the insertion pipe 15 corresponds to the docking point of the adapter 8 and the measuring cylinder 25, and they are sleeved and reinforced to increase the stability after the two are sleeved, thereby avoiding accidental gas leakage. When gas leakage occurs at the docking point, the excessive gas pressure causes the sealing membrane 17 to rupture, so that the gas enters the collection chamber 18 with the rupture of the sealing membrane 17, driving the expansion of the collection chamber 18, and thus playing a role in collecting accidental gas leakage.

[0037] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 :

[0038] A shale gas generating device and its method of use that can prevent instantaneous ejection of high-pressure valves are disclosed. A connecting pipe 16 is fixedly installed on the outer surface of the insertion pipe 15. A sealing membrane 17 is installed on the inner wall of the connecting pipe 16. A collection chamber 18 is provided on the outer side of the sealing membrane 17. A through hole 19 is opened inside the insertion pipe 15, and the through hole 19 and the sealing membrane 17 are interconnected. Control bolts 31 are threaded through and connected to both sides of the limiting clamp 13. A positioning clamp 32 is rotatably connected to the front end of the control bolt 31. A limiting slider 33 is provided on the outer surface of the positioning clamp 32, and the limiting slider 33 is slidably connected to the inner wall of the limiting clamp 13.

[0039] By sliding the positioning ring 10 and adjusting the sliding between the sliding rod 12 and the positioning rod 11, the limiting clamp 13 is sleeved on the outer surface of the rubber tube 14. By rotating the control bolt 31, the positioning clamp 32 can be pushed by the control bolt 31 and the positioning clamp 32 under the assistance of the sliding of the limiting slider 33, thus clamping the rubber tube 14.

[0040] Please see Figure 1 , Figure 3 and Figure 4 :

[0041] A shale gas generation device and its usage method are disclosed, which can prevent instantaneous leakage of high-pressure valves. A jack 21 is fixedly installed on the top of a horizontal base 1, and the jack 21 is located directly below a support frame 3. A vacuum pump 22 is fixedly installed on the top of the horizontal base 1, and the vacuum pump 22 is located on the back of the support frame 3. The tail end of a rubber tube 14 is connected to the top of the vacuum pump 22. A limit rod 23 is installed on the top of the horizontal base 1, and the limit rod 23 is located on the back of the vacuum pump 22. Two sets of snap-fit ​​rings 24 are fixedly installed on the outer surface of the limit rod 23. A measuring cylinder 25 is snapped into the inside of the snap-fit ​​ring 24, and the top of the measuring cylinder 25 is connected to an adapter 8. A connecting rod 26 is installed on the top of the horizontal base 1. A connecting ring 27 is sleeved on the outer surface of the connecting rod 26, and a liquid collector is snapped into the inside of the connecting ring 27. The liquid collector 28 has a high-sensitivity pressure reducing valve 29 fixedly installed on the top of the outer surface of the copper conduit 6. The bottom of the measuring cylinder 25 has a connecting pipe 30 fixedly installed, and the tail end of the connecting pipe 30 is connected to the bottom of the liquid collector 28. The inner wall of the fixing frame 2 has a connecting plate 34 fixedly installed, and the top of the connecting plate 34 has a high-sensitivity temperature controller 35 fixedly installed. The outer surface of the reaction cylinder 5 is provided with an electric furnace 36. The inside of the connecting pipe 16 is fixedly installed with a power block 37. The output end of the power block 37 is electrically connected to an electric heating element 38, and the electric heating element 38 is interconnected with the through hole 19. The outer surface of the power block 37 is provided with a power cord 39. The outer surface of the collection chamber 18 is threadedly connected with a sealing cap 40. The outer surface of the connecting pipe 16 has a limiting groove 20, and the collection chamber 18 is located inside the limiting groove 20.

[0042] The through hole 19 is surrounded by electric heating elements 38 at the top and bottom. With the power supply block 37 and power cord 39 connected to an external power source, the power supply block 37 drives the electric heating elements 38 to heat the through hole 19, thus keeping the gas and liquid in the gas input into the collection chamber 18 in a heated state. This prevents the through hole 19 from cooling and becoming blocked, maintaining its efficient unblocking function. The material collected inside the collection chamber 18 can be collected and reused by rotating the sealing cover 40.

[0043] The working principle is as follows: The positioning ring 10 on the sliding copper conduit 6 drives the positioning rod 11 to slide. The sliding rod 12 can be adjusted within the positioning rod 11, thus allowing the positioning rod 11 and the sliding rod 12 to slide. During use, the distance between the limiting clamp 13 and the rubber tube 14 is adjusted by the sliding of the positioning ring 10. The limiting clamp 13 can be slid closer to the rubber tube 14 during use. After the rubber tube 14 is installed and connected to the gas valve 9, the rubber tube 14 is snapped into the inside of the insertion pipe 15. Through the sliding of the positioning ring 10 and the sliding adjustment between the sliding rod 12 and the positioning rod 11, the rotation of the control bolt 31, with the assistance of the sliding of the limiting slider 33, allows the rotation between the control bolt 31 and the positioning clamp 32 to be pushed. This allows for the clamping of the rubber tube 14. When the device is generating shale gas, the adapter 8 and the measuring cylinder 25 are connected by a sleeve. The position of the through hole 19 on the insertion tube 15 corresponds to the joint between the adapter 8 and the measuring cylinder 25. The sleeve connection increases the stability of the connection. By increasing the stability of the connection, the impact of gas impact on the connection can be reduced when gas output is impacted. Gas impact can cause the connection to loosen, which can easily lead to accidental gas leakage. By increasing the stability of the connection, accidental gas leakage can be avoided. When gas leakage occurs at the joint, the excessive gas pressure causes the sealing membrane 17 to rupture, allowing the gas to enter the collection chamber 18 with the rupture of the sealing membrane 17. This causes the collection chamber 18 to expand, thereby collecting the accidental gas leakage.

[0044] Example 1:

[0045] (1) Simulate the generation of shale gas in a closed system. After the system is evacuated, all valves are closed to make the system a closed system. Under certain pressure conditions (100 MPa), the temperature is rapidly raised to 600℃ and kept constant for 24 hours so that the shale reaches a high maturity stage (Ro = 4-5).

[0046] (2) The temperature is reduced to 250℃ in a closed system to achieve the conditions at the maximum burial depth of shale. The pressure at this time represents the pressure of free gas in shale at the maximum burial depth, PMax.

[0047] (3) Open the rightmost valve in the system to release a certain amount of gas through pressure reducing valve 29, bringing the pressure back to the current pressure condition (50 MPa). The amount of gas released represents the amount of shale gas discharged during the geological uplift process, based on:

[0048] P1V=n1 RT1(250℃,PMax);

[0049] P2V=n2RT2 (100℃, 50Mpa);

[0050] Assuming the system volume V remains constant before and after the simulation, the hydrocarbon expulsion efficiency of shale can be calculated using the above two equations:

[0051]

[0052] (4) Simulation of the complete analytical process of shale in a semi-closed system:

[0053] After the system stabilizes under the current burial conditions (100℃, 50MPa), open the rightmost valve and the gas collection device, maintain 100℃, and detect the full analysis process of shale, that is, the relationship between the shale desorption gas content and time. When the gas content is stable, it represents the content of residual gas in the shale, that is, the amount of residual resources in the shale.

[0054] (5) Simulated recoverable shale resources under hydraulic fracturing:

[0055] By adding a certain amount of system pressure again (by applying external pressure through jack 21), the change in the content of discharged shale gas with external pressure is determined, that is, the maximum recoverable reserves in the remaining shale under the current burial depth conditions are determined.

[0056] Example 2:

[0057] (1) Simulate the generation of shale gas in a closed system. After the system is evacuated, all valves are closed to make the system a closed system. Under certain pressure conditions (100 MPa), the temperature is rapidly raised to 600℃ and kept constant for 24 hours so that the shale reaches a high maturity stage (Ro = 4-5).

[0058] (2) The temperature is reduced to 250℃ in a closed system to achieve the conditions at the maximum burial depth of shale. The pressure at this time represents the pressure of free gas in shale at the maximum burial depth, PMax.

[0059] (3) Open the rightmost valve of the system to release a certain amount of gas through pressure reducing valve 29, so that the pressure reaches the current pressure conditions (greater than 50 MPa). The amount of gas released represents the amount of shale gas discharged during the geological uplift process, according to:

[0060] P1V=n1 RT1(250℃,PMax);

[0061] P2V=n2RT2 (100℃, 50Mpa);

[0062] Assuming the system volume V remains constant before and after the simulation, the hydrocarbon expulsion efficiency of shale can be calculated using the above two equations:

[0063]

[0064] (4) Simulation of the complete analytical process of shale in a semi-closed system:

[0065] After the system stabilizes under the current burial conditions (100℃, 50MPa), open the rightmost valve and the gas collection device, maintain 100℃, and detect the full analysis process of shale, that is, the relationship between the shale desorption gas content and time. When the gas content is stable, it represents the content of residual gas in the shale, that is, the amount of residual resources in the shale.

[0066] (5) Simulated recoverable shale resources under hydraulic fracturing:

[0067] By adding a certain amount of system pressure again (by applying external pressure through jack 21), the change in the content of discharged shale gas with external pressure is determined, that is, the maximum recoverable reserves in the remaining shale under the current burial depth conditions are determined.

[0068] Example 3:

[0069] (1) Simulate the generation of shale gas in a closed system. After the system is evacuated, all valves are closed to make the system a closed system. Under certain pressure conditions (100 MPa), the temperature is rapidly raised to 600℃ and kept constant for 24 hours so that the shale reaches a high maturity stage (Ro = 4-5).

[0070] (2) The temperature is reduced to 250℃ in a closed system to achieve the conditions at the maximum burial depth of shale. The pressure at this time represents the pressure of free gas in shale at the maximum burial depth, PMax.

[0071] (3) Open the rightmost valve of the system to release a certain amount of gas through pressure reducing valve 29, so that the pressure reaches the current pressure conditions (less than 50 MPa). The amount of gas released represents the amount of shale gas discharged during the geological uplift process, according to:

[0072] P1V=n1 RT1(250℃,PMax);

[0073] P2V=n2RT2 (100℃, 50Mpa);

[0074] Assuming the system volume V remains constant before and after the simulation, the hydrocarbon expulsion efficiency of shale can be calculated using the above two equations:

[0075]

[0076] (4) Simulation of the complete analytical process of shale in a semi-closed system:

[0077] After the system stabilizes under the current burial conditions (100℃, 50MPa), open the rightmost valve and the gas collection device, maintain 100℃, and detect the full analysis process of shale, that is, the relationship between the shale desorption gas content and time. When the gas content is stable, it represents the content of residual gas in the shale, that is, the amount of residual resources in the shale.

[0078] (5) Simulated recoverable shale resources under hydraulic fracturing:

[0079] By adding a certain amount of system pressure again (by applying external pressure through jack 21), the change in the content of discharged shale gas with external pressure is determined, that is, the maximum recoverable reserves in the remaining shale under the current burial depth conditions are determined.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0081] The present invention is not limited to the specific embodiments described above.

[0082] This invention extends to any new feature or combination thereof disclosed in this specification, as well as any new method or process step or combination thereof disclosed herein.

Claims

1. A shale gas generation device that prevents instantaneous ejection from high-pressure valves, comprising a horizontal base, characterized in that: A fixing frame is fixedly installed on the top of the horizontal base, and a support frame is fixedly installed on the top of the horizontal base, with the support frame located on the back of the fixing frame. A placement plate is slidably connected to the inner wall of the support frame, a reaction cylinder is fixedly installed on the top of the placement plate, and a copper conduit is fixedly installed on the outer surface of the reaction cylinder. A system pressure gauge is fixedly installed on the outer surface of the copper conduit, and an adapter is fixedly installed at the tail end of the copper conduit. Gas valves are provided on the outer surface of the copper conduit between the system pressure gauge and the adapter, and at the tail end of the adapter. A positioning ring is sleeved on the outer surface of the copper conduit, and a positioning rod is fixedly installed at the bottom of the positioning ring. The positioning rod is internally slidably connected to a sliding rod, and limit clamps are fixedly installed on the bottom of the front of both the positioning rod and the sliding rod. The bottom of the two sets of gas valves on the copper conduit is fitted with rubber tubes. A limit rod is installed on the top of the horizontal base, and the limit rod is located on the back of the vacuum pump. Two sets of snap rings are fixedly installed on the outer surface of the limit rod. The measuring cylinder is snapped into the inside of the snap ring, and the top of the measuring cylinder is connected to the adapter. The outer surface of the adapter is fitted with a connector tube, and the top of the measuring cylinder is inserted into the inside of the connector tube. A connecting tube is fixedly installed on the outer surface of the insertion tube, a sealing membrane is installed on the inner wall of the connecting tube, and a collection chamber is provided on the outer side of the sealing membrane. The insertion tube has a through hole inside, and the through hole communicates with the sealing membrane. The outer surface of the connecting tube has a limiting groove, and the collection chamber is located inside the limiting groove.

2. The shale gas generation device according to claim 1, which can prevent instantaneous injection of high-pressure valves, is characterized in that: A jack is fixedly installed on the top of the horizontal base, and the jack is located directly below the support frame.

3. A shale gas generation device for preventing instantaneous high-pressure valve ejection according to claim 1, characterized in that: A vacuum pump is fixedly installed on the top of the horizontal base, and the vacuum pump is located on the back of the support frame, with the tail end of the rubber tube connected to the top of the vacuum pump.

4. A shale gas generation device according to claim 1 that can prevent instantaneous injection of high-pressure valves, characterized in that: A connecting rod is installed on the top of the horizontal base, a connecting ring is sleeved on the outer surface of the connecting rod, a liquid collector is snapped into the inside of the connecting ring, and a pressure reducing valve is fixedly installed on the top of the outer surface of the copper conduit.

5. A shale gas generation device according to claim 1 that can prevent instantaneous injection of high-pressure valves, characterized in that: A connecting pipe is fixedly installed at the bottom of the measuring cylinder, and the tail end of the connecting pipe is connected to the bottom of the liquid collector.

6. A shale gas generation device according to claim 1 that can prevent instantaneous injection of high-pressure valves, characterized in that: Both sides of the limiting clamp are threaded with control bolts, and the front end of the control bolt is rotatably connected to a positioning clamp. The outer surface of the positioning clamp is provided with a limiting slider, and the limiting slider is slidably connected to the inner wall of the limiting clamp.

7. A shale gas generation device for preventing instantaneous high-pressure valve ejection according to claim 1, characterized in that: A connecting plate is fixedly installed on the inner wall of the fixed frame, a temperature controller is fixedly installed on the top of the connecting plate, and an electric furnace is provided on the outer surface of the reaction cylinder.

8. A shale gas generation device according to claim 1 that can prevent instantaneous injection of high-pressure valves, characterized in that: A power supply block is fixedly installed inside the connecting tube. The output end of the power supply block is electrically connected to an electric heating element, and the electric heating element is interconnected with the through hole. The outer surface of the power block is provided with a power cord, and the outer surface of the collection chamber is threaded with a sealing cap.

9. A method of using a shale gas generation device that prevents instantaneous high-pressure valve injection according to any one of claims 1-8, characterized in that, The method to prevent instantaneous spraying from the high-pressure valve is as follows: Step S1: The jack on the horizontal base can apply external pressure to the system. The measuring cylinder inside the snap ring is connected to the adapter. The measuring cylinder is used to calibrate the gas content and collect the gas. A pressure reducing valve is fixedly installed on the top of the outer surface of the copper conduit. The pressure reducing valve has a set pressure value. When the pressure value is exceeded, the valve releases gas to the outside, which protects the system and can also adjust the internal pressure of the system. The bottom of the measuring cylinder is equipped with a connecting pipe for draining and collecting gas. A connecting plate is fixedly installed on the inner wall of the fixing frame. An electric furnace is installed on the outer surface of the reaction cylinder. The electric furnace is used to heat the system and can heat it quickly. Step S2: When the device is generating shale gas, after the rubber tube is connected to the gas valve at the gas outlet, the positioning ring on the sliding copper guide tube is installed, which in turn drives the positioning rod to slide. The positioning rod slides and adjusts the sliding rod, and then the positions of the positioning rod and the sliding rod are slid. In use, the distance between the limiting clamp and the rubber tube is adjusted by the sliding property of the positioning ring. Step S3: In use, slide the limiting clamp close to the rubber tube. By sliding the positioning ring and adjusting the sliding between the sliding rod and the positioning rod, the limiting clamp is fitted onto the outer surface of the rubber tube. By rotating the control bolt, the rotation between the control bolt and the positioning clamp is controlled, and the positioning clamp is pushed to clamp the rubber tube. Step S4: The position of the through hole on the connector corresponds to the joint between the adapter and the measuring cylinder. When the gas output is impacted, gas leakage occurs at the joint. The excessive gas pressure causes the sealing membrane to rupture, allowing the gas to enter the collection chamber along with the ruptured sealing membrane. This causes the collection chamber to expand and collect the gas.

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