Shale gas generation device capable of preventing instant spraying of high-pressure valve and use method of shale gas generation device

Abstract

The shale gas generation device 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 on the back face of the fixing frame, and a placing plate is slidably connected to the inner wall of the supporting frame; a reaction cylinder is fixedly mounted at the top of the placement plate, a copper guide pipe is fixedly mounted on the outer surface of the reaction cylinder, a system pressure gauge is fixedly mounted on the outer surface of the copper guide pipe, and an adapter is fixedly mounted at the tail end of the copper guide pipe. The connecting position of the measuring cylinder and the adapter is sleeved through the inserting pipe, the position of the through hole in the inserting pipe corresponds to the butt joint position of the adapter and the measuring cylinder, and when impact occurs during gas output, gas leakage occurs at the butt joint position, and the air pressure is too large, the sealing film is broken, so that gas enters the collecting bin along with the breakage of the sealing film; and the collection bin is driven to be amplified, so that the gas is collected.

Description

Technical Field

[0001] The present invention relates to the technical field of shale gas generation, and in particular to a shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve and a use method thereof. Background Art

[0002] Under geological conditions, the system in which shale is located during the process of hydrocarbon generation and expulsion will change with the evolution of burial history. During the deep burial of the formation, shale hydrocarbon generation is in a closed system, and the generated hydrocarbons are mainly stored in the shale formation. During the uplift of the formation, some oil and gas in the shale layer will leak, and the hydrocarbon generation of shale is in a semi-open system. Shale may transform between a closed system and a semi-open system during the process of hydrocarbon generation. At present, for shale hydrocarbon generation simulation experimental devices, either a closed system is used, such as a closed system based on a gold tube, a closed system of a quartz tube / glass tube, or a semi-open system is used.

[0003] Patent document: CN109100259A, discloses a shale gas generation analysis device, including "including a generation and collection module, a control and processing module; the generation and collection module includes a reactor, an oil and gas separator, a gas collection tank, a first pipeline, and a second pipeline; a temperature sensor is arranged in the reactor, a heating jacket is arranged outside the reactor, the reactor is connected to the oil and gas separator through the first pipeline, a first pressure sensor is arranged on the first pipeline, two high-pressure valves are arranged in series on the first pipeline, and the two high-pressure valves are located between the first pressure sensor and the oil and gas separator; there is a distance between the two high-pressure valves; the oil and gas separator is connected to one end of the second pipeline, and the other end of the second pipeline is connected to a plurality of gas distribution pipes, and each terminal of the gas distribution pipe is connected to one of the gas collection tanks; a second pressure sensor is arranged on the second pipeline; each gas distribution pipe is provided with a low-pressure valve; 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 force sensor, the second pressure sensor and the temperature sensor are used to obtain the air pressure information collected by the first pressure sensor and the second pressure sensor and the reactor temperature information obtained by the temperature sensor for data analysis; the display module is connected to the data analysis module to display the air pressure information and the reactor temperature information," and "it uses the control module to control the heating sleeve to heat the sample in the reactor in an air bath, which can accurately control the temperature of the reactor and obtain the desorption air pressure data of the core sample under different geological temperature conditions, and there is no upper limit on the heating temperature, avoiding the problem of the upper limit of the temperature in traditional water bath heating; at the same time, it obtains the pressure information of the gas through the pressure sensor, and then calculates the characteristics of the desorption gas content and other characteristics of the core sample through the data analysis module, and the data results are accurate and reliable; in addition, it connects the generation, storage and desorption processes of shale gas in a closed system in series, so that the shale gas composition, shale reservoir characteristics and shale gas desorption process are interrelated, and the research has good integrity, and the operation is convenient. The gas is always protected during the transfer process, and there is no problem of sample contamination caused by improper sample transfer. ";

[0004] Patent document: CN105604881A, discloses a shale gas extraction device, including "an electromagnetic coil and a magnetic field controller are installed in its protective shell, and a tripod is fixed on the lower side of the outer side of the protective shell; the electromagnetic coil is fixed on the lower side of the outer side of the supercharged shell, and the lower end of the supercharged shell is fixed on the lower end of the protective shell; a pipe shaft type air outlet valve, an air intake valve, a power spring, and a magnetic piston are installed in the supercharged shell, and the lower end of the pipe shaft type air outlet valve passes through the center hole at the upper end of the supercharged shell and then passes through the power spring and the magnetic piston, and the air intake valve is installed on the annular inner step at the inner end of the air intake hole and cooperates with the cross 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 discharge structure in the device, and when the gas valve is opened, since its main function is to output the gas, when the gas valve instantly releases the high-pressure gas in the device, it will impact the output pipe structure connected to it, which may easily lead to accidental leakage of gas. Therefore, there is a lack of suitable protective structure. Summary of the invention

[0006] The object of the present invention is to provide a shale gas generation device and a method of using the device, which can prevent instantaneous blowout of a high-pressure valve, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve and a method of using the same, comprising a horizontal base, a fixing frame fixedly mounted on the top of the horizontal base, a supporting frame fixedly mounted on the top of the horizontal base, and the supporting frame is located on the back of the fixing frame;

[0008] The inner wall of the support frame is slidably connected with a placement plate, a reaction tube is fixedly installed on the top of the placement plate, a copper conduit is fixedly installed on the outer surface of the reaction tube, a system pressure gauge is fixedly installed on the outer surface of the copper conduit, a conversion joint is fixedly installed on the tail end of the copper conduit, a gas valve is arranged on the outer surface of the copper conduit between the system pressure gauge and the conversion joint and on the tail end of the conversion joint, a positioning ring is sleeved on the outer surface of the copper conduit, a positioning rod is fixedly installed on the bottom of the positioning ring, a sliding rod is slidably connected inside the positioning rod, a limiting clamp is fixedly installed on the bottom of the front of the positioning rod and the sliding rod, and the bottoms of the two groups of gas valves on the copper conduit are sleeved with A rubber tube, 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 clamping rings are fixedly installed on the outer surface of the limit rod, a measuring cylinder is clamped inside the clamping ring, and the top of the measuring cylinder is connected to the adapter, a plug-in tube is sleeved on the outer surface of the adapter, and the top of the measuring cylinder is plugged into the inside of the plug-in tube, a connecting tube is fixedly installed on the outer surface of the plug-in tube, a sealing film is installed on the inner wall of the connecting tube, a collection bin is arranged on the outside of the sealing film, a through hole is opened inside the plug-in tube, and the through hole and the sealing film are interconnected, a limit groove is opened on the outer surface of the connecting tube, and the collection bin is located inside the limit groove.

[0009] In some possible implementations, a jack is fixedly installed 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, the vacuum pump is located on the back of the support frame, and the tail end of the rubber tube is connected to the top of the vacuum pump.

[0011] In some possible implementations, 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 clamped inside the connecting ring, and a pressure reducing valve is fixedly installed on the top of the outer surface of the copper conduit.

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

[0013] In some possible embodiments, both sides of the limit clamp are threadedly connected with control bolts, the front end of the control bolt is rotatably connected to the positioning clamp, the outer surface of the positioning clamp is provided with a limit slider, and the limit slider is slidably connected to the inner wall of the limit clamp.

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

[0015] In some possible embodiments, a power block is fixedly installed inside the connecting tube, the output end of the power block is electrically connected to an electric heating plate, and the electric heating plate and the through hole are interconnected, a power cord is provided on the outer surface of the power block, and a sealing cover is threadedly connected to the outer surface of the collection bin.

[0016] In some possible implementations, the method for preventing instantaneous spraying of a high pressure valve is as follows:

[0017] Step S1, the jack on the horizontal base can apply external pressure to the system, which has high sensitivity, a large range and good constant pressure effect. The measuring cylinder in the clamping ring is connected to the adapter, and 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 set a certain pressure value. When the pressure exceeds the pressure, the gas is 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 to drain water and collect gas. 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 effects. An electric heating furnace is arranged on the outer surface of the reaction cylinder. The use of the electric heating furnace plays a heating role and can quickly heat the system.

[0018] Step S2, when the device is generating shale gas, the rubber tube and the gas valve at the gas outlet are sleeved and installed, and the positioning ring on the copper conduit can be slid to drive the positioning rod to slide, and the sliding rod can be slidably adjusted inside the positioning rod, and then the positions of the positioning rod and the sliding rod can be slid, and the distance between the limit clamp and the rubber tube is adjusted by the sliding property of the positioning ring during use;

[0019] Step S3, when in use, the limit clamp can be slid close to the rubber tube, and the limit clamp can be sleeved on the outer surface of the rubber tube by sliding the positioning ring and adjusting the sliding rod and the positioning rod. The positioning clamp can be pushed to clamp the rubber tube by rotating the control bolt and the rotation between the control bolt and the positioning clamp;

[0020] Step S4, the position of the through hole on the plug-in tube 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 may cause the sealing film to rupture, thereby allowing the gas to enter the collection chamber as the sealing film ruptures, driving the collection chamber to expand and then collect the gas.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention sleeves the connection between the measuring cylinder and the adapter through the plug-in tube, and the position of the through hole on the plug-in tube corresponds to the docking point of the adapter and the measuring cylinder. When the gas output is impacted and the gas leaks at the docking point, the excessive gas pressure causes the sealing film to rupture, so that the gas enters the collection chamber with the rupture of the sealing film, drives the enlargement of the collection chamber, and then collects the gas.

[0023] The present invention drives the heating work of the electric heating plate through the power block, thereby keeping the gas flowing through the through hole and the liquid in the gas in a heated state, preventing cooling blockage at the through hole, maintaining its efficient dredging effect, and can open the sealing cover by rotating it to collect and utilize the materials collected inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

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

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

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

[0028] Figure 5 It is a cross-sectional schematic diagram of the plug-in tube structure of the present invention;

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

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

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

[0032] Among them: 1-horizontal base, 2-fixed frame, 3-support frame, 4-placing 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-plug tube, 16-connecting tube, 17-sealing film, 18-collection chamber, 19-through hole, 20-limiting groove, 21-jack, 22-vacuum pump, 23-limiting rod, 24-clamping ring, 25-measuring cylinder, 26-connecting rod, 27-connecting ring, 28-liquid collector, 29-pressure reducing valve, 30-connecting pipeline, 31-control bolt, 32-positioning clamp, 33-limiting slider, 34-connecting plate, 35-temperature controller, 36-electric heating furnace, 37-power block, 38-electric heating plate, 39-power cord, 40-sealing cover. DETAILED DESCRIPTION

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 :

[0035] A shale gas generating device capable of preventing instantaneous blowout of a high-pressure valve and a method for using the same, comprising a horizontal base 1, a fixing frame 2 being fixedly installed on the top of the horizontal base 1, a supporting frame 3 being fixedly installed on the top of the horizontal base 1, and the supporting frame 3 being located on the back of the fixing frame 2, a placing plate 4 being slidably connected to the inner wall of the supporting frame 3, a reaction tube 5 being fixedly installed on the top of the placing plate 4, a copper conduit 6 being fixedly installed on the outer surface of the reaction tube 5, a system pressure gauge 7 being fixedly installed on the outer surface of the copper conduit 6, a switching joint 8 being fixedly installed on the tail end of the copper conduit 6, the outer surface of the copper conduit 6 being located between the system pressure gauge 7 and the switching joint 8, and the switching joint 8 The tail end of each of the copper conduits 6 is provided with a gas valve 9, 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, and a limiting clamp 13 is fixedly installed at the bottom of the front of the positioning rod 11 and the sliding rod 12, a rubber tube 14 is sleeved on the bottom of the two groups of gas valves 9 on the copper conduit 6, a plug-in tube 15 is sleeved on the outer surface of the two groups of gas valves 9 on the copper conduit 6, and the top of the rubber tube 14 is plugged into the inside of the plug-in tube 15, a limiting groove 20 is provided on the outer surface of the connecting tube 16, and the collection bin 18 is located inside the limiting groove 20;

[0036] When the device is performing shale gas generation work, the positioning ring 10 on the sliding copper conduit 6 can be driven to position and slide the positioning rod 11. The sliding rod 12 can be slidably adjusted in the positioning rod 11, and then 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 limit 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 plug-in tube 15 corresponds to the joint between the adapter 8 and the measuring cylinder 25. The sleeve is reinforced to increase the stability of the sleeve connection between the two, thereby avoiding accidental leakage of gas. When gas leakage occurs at the joint, the excessive air pressure causes the sealing film 17 to rupture, so that the gas enters the collection chamber 18 with the rupture of the sealing film 17, driving the enlargement of the collection chamber 18, and then collecting the accidental leakage of gas.

[0037] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 :

[0038] A shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve and a method for using the same, wherein a connection pipe 16 is fixedly mounted on the outer surface of the plug-in pipe 15, a sealing film 17 is mounted on the inner wall of the connection pipe 16, a collection chamber 18 is arranged on the outer side of the sealing film 17, a through hole 19 is opened inside the plug-in pipe 15, and the through hole 19 and the sealing film 17 are mutually connected, both sides of the limit clamp 13 are threadedly connected with control bolts 31, the front end of the control bolt 31 is rotatably connected with a positioning clamp 32, a limit slider 33 is arranged on the outer surface of the positioning clamp 32, and the limit slider 33 is slidably connected to the inner wall of the limit 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, with the assistance of the sliding property of the limiting slider 33, the rotation between the control bolt 31 and the positioning clamp 32 can be controlled, so that the positioning clamp 32 can be pushed, thereby being used to clamp the rubber tube 14.

[0040] See also Figure 1 , Figure 3 and Figure 4 :

[0041] A shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve and a method for using the same, wherein a jack 21 is fixedly mounted on the top of the horizontal base 1, and the jack 21 is located directly below a support frame 3, a vacuum pump 22 is fixedly mounted on the top of the horizontal base 1, and the vacuum pump 22 is located on the back of the support frame 3, and the tail end of a rubber tube 14 is connected to the top of the vacuum pump 22, a limiting rod 23 is mounted on the top of the horizontal base 1, and the limiting rod 23 is located on the back of the vacuum pump 22, two groups of clamping rings 24 are fixedly mounted on the outer surface of the limiting rod 23, a measuring cylinder 25 is clamped inside the clamping ring 24, and the top of the measuring cylinder 25 is connected to an adapter 8, a connecting rod 26 is mounted 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 collecting ring 27 is clamped inside the connecting ring 27 The collector 28, a high-sensitivity pressure reducing valve 29 is fixedly installed on the top of the outer surface of the copper conduit 6, a connecting pipe 30 is fixedly installed on the bottom of the measuring cylinder 25, and the tail end of the connecting pipe 30 is connected to the bottom of the liquid collector 28, a connecting plate 34 is fixedly installed on the inner wall of the fixing frame 2, and a high-sensitivity temperature controller 35 is fixedly installed on the top of the connecting plate 34, an electric heating furnace 36 is arranged on the outer surface of the reaction cylinder 5, a power block 37 is fixedly installed inside the connecting pipe 16, an output end of the power block 37 is electrically connected to an electric heating plate 38, and the electric heating plate 38 and the through hole 19 are connected to each other, a power line 39 is arranged on the outer surface of the power block 37, and a sealing cover 40 is threadedly connected to the outer surface of the collection bin 18; a limiting groove 20 is provided on the outer surface of the connecting pipe 16, and the collection bin 18 is located inside the limiting groove 20;

[0042] The through hole 19 is wrapped by an electric heating plate 38 above and below. Through the arrangement of a power block 37 and a power cord 39, after the power cord 39 is connected to an external power source, the power block 37 drives the electric heating plate 38 to heat the through hole 19, thereby acting as a heating seat to keep the gas input into the collection chamber 18 and the liquid in the gas in a heated state, thereby preventing cooling blockage at the through hole 19 and maintaining its efficient dredging effect. The collection chamber 18 can be opened by rotating the sealing cover 40 and then the materials collected inside it can be collected and utilized.

[0043] The working principle is as follows: the positioning ring 10 on the slidable copper conduit 6 can then drive the positioning rod 11 to slide in a positioning manner, the sliding rod 12 can be slidably adjusted inside the positioning rod 11, and then the positions of the positioning rod 11 and the sliding rod 12 can be slid. When in use, the distance between the limit clamp 13 and the rubber tube 14 can be adjusted by the sliding property of the positioning ring 10. When in use, the limit clamp 13 can be slid close to the rubber tube 14. After the rubber tube 14 is installed and connected to the gas valve 9, the rubber tube 14 is clamped into the inside of the plug-in tube 15. Through the sliding of the positioning ring 10 and the sliding adjustment between the sliding rod 12 and the positioning rod 11, the control bolt 31 can be rotated, so that with the auxiliary effect of the sliding property of the limit slider 33, the rotation between the control bolt 31 and the positioning clamp 32 can be controlled, thereby pushing the positioning clamp 32. , so that it can be used to clamp the rubber tube 14. When the device is performing shale gas generation work, the adapter 8 and the measuring cylinder 25 will be sleeved and installed. The position of the through hole 19 on the plug-in tube 15 corresponds to the joint between the adapter 8 and the measuring cylinder 25. The sleeve wrapping increases the stability of the two after the sleeve connection. By increasing the stability of the connection, when the gas output is impacted, the impact of the gas impact on the connection can be reduced. The impact of the gas will cause the loosening of the connection, and the loosening will easily cause the accidental leakage of the gas. By increasing the stability of the connection, the accidental leakage of the gas can be avoided. When the gas leaks at the joint, the excessive gas pressure causes the sealing film 17 to rupture, so that the gas enters the collection chamber 18 with the rupture of the sealing film 17, driving the enlargement of the collection chamber 18, and then collecting the accidental leakage of the gas.

[0044] Embodiment 1:

[0045] (1) To 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 °C and kept constant for 24 hours to make the shale reach a high maturity stage (Ro = 4-5);

[0046] (2) Lowering the temperature to 250°C in a closed system to reach the condition at the maximum burial depth of shale. The pressure at this time represents the pressure PMax of shale free gas at the maximum burial depth;

[0047] (3) Open the valve on the far right of the system and release a certain amount of gas through the pressure reducing valve 29 to make the pressure reach the current pressure condition (50Mpa). The amount of released gas represents the amount of shale gas discharged during the geological uplift process, according to:

[0048] P1V=n1 RT1(250℃,PMax);

[0049] P2V=n2RT2 (100℃, 50Mpa);

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

[0051]

[0052] (4) Full analytical process simulation of shale in semi-closed system:

[0053] After the system is stable under the current burial conditions (100°C, 50Mpa), open the rightmost valve of the system and the exhaust gas collection device, maintain 100°C, and detect the full analysis process of shale, that is, the relationship between the shale analysis gas content and time. When the gas content is stable, it represents the residual gas content of shale, that is, the residual resource amount of shale;

[0054] (5) Recoverable shale resources under simulated fracturing:

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

[0056] Embodiment 2:

[0057] (1) To 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 °C and kept constant for 24 hours to make the shale reach a high maturity stage (Ro = 4-5);

[0058] (2) Lowering the temperature to 250°C in a closed system to reach the condition at the maximum burial depth of shale. The pressure at this time represents the pressure PMax of shale free gas at the maximum burial depth;

[0059] (3) Open the rightmost valve of the system and release a certain amount of gas through the pressure reducing valve 29 to make the pressure reach the current pressure condition (greater than 50Mpa). The amount of released gas 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 that the volume V of the system remains unchanged before and after the simulation, the hydrocarbon expulsion efficiency of shale can be calculated based on the above two equations:

[0063]

[0064] (4) Full analytical process simulation of shale in semi-closed system:

[0065] After the system is stable under the current burial conditions (100°C, 50Mpa), open the rightmost valve of the system and the exhaust gas collection device, maintain 100°C, and detect the full analysis process of shale, that is, the relationship between the shale analysis gas content and time. When the gas content is stable, it represents the residual gas content of shale, that is, the residual resource amount of shale;

[0066] (5) Recoverable shale resources under simulated fracturing:

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

[0068] Embodiment three:

[0069] (1) To 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 °C and kept constant for 24 hours to make the shale reach a high maturity stage (Ro = 4-5);

[0070] (2) Lowering the temperature to 250°C in a closed system to reach the condition at the maximum burial depth of shale. The pressure at this time represents the pressure PMax of shale free gas at the maximum burial depth;

[0071] (3) Open the rightmost valve of the system and release a certain amount of gas through the pressure reducing valve 29 to make the pressure reach the current pressure condition (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 that the volume V of the system remains unchanged before and after the simulation, the hydrocarbon expulsion efficiency of shale can be calculated based on the above two equations:

[0075]

[0076] (4) Full analytical process simulation of shale in semi-closed system:

[0077] After the system is stable under the current burial conditions (100°C, 50Mpa), open the rightmost valve of the system and the exhaust gas collection device, maintain 100°C, and detect the full analysis process of shale, that is, the relationship between the shale analysis gas content and time. When the gas content is stable, it represents the residual gas content of shale, that is, the residual resource amount of shale;

[0078] (5) Recoverable shale resources under simulated fracturing:

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

[0080] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, 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 above-mentioned specific embodiments.

[0082] The present invention extends to any new features or any new combination disclosed in this specification, and any new method or process steps or any new combination disclosed.

Claims

1. A shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve, comprising a horizontal base, characterized in that: A fixing frame is fixedly installed on the top of the horizontal base, a supporting frame is fixedly installed on the top of the horizontal base, and the supporting frame is located on the back of the fixing frame; The inner wall of the support frame is slidably connected with a placement plate, 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, a conversion joint is fixedly installed on the tail end of the copper conduit, a gas valve is arranged on the outer surface of the copper conduit between the system pressure gauge and the conversion joint and on the tail end of the conversion joint, a positioning ring is sleeved on the outer surface of the copper conduit, and a positioning rod is fixedly installed on the bottom of the positioning ring; The interior of the positioning rod is slidably connected to a sliding rod, and the bottom of the front of the positioning rod and the sliding rod are fixedly installed with a limit clamp; The bottoms of the two groups of gas valves on the copper conduit are sleeved 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, and two groups of clamping rings are fixedly installed on the outer surface of the limit rod; The inside of the clamping ring is clamped with a measuring cylinder, and the top of the measuring cylinder is connected to the adapter. The outer surface of the adapter is sleeved with a plug-in tube, and the top of the measuring cylinder is plugged into the inside of the plug-in tube. A connecting tube is fixedly installed on the outer surface of the plug tube, a sealing film is installed on the inner wall of the connecting tube, and a collection chamber is arranged on the outer side of the sealing film; A through hole is provided inside the plug-in tube, and the through hole and the sealing film are interconnected. A limiting groove is provided on the outer surface of the connecting tube, and the collection bin is located inside the limiting groove.

2. A shale gas generating device capable of preventing instantaneous blowout of a high pressure valve according to claim 1, characterized in that: A jack is fixedly installed on the top of the horizontal base, and the jack is located just below the support frame.

3. A shale gas generating device capable of preventing instantaneous blowout of a high pressure valve 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, and the tail end of the rubber tube is connected to the top of the vacuum pump.

4. A shale gas generating device capable of preventing instantaneous blowout of a high pressure valve according to claim 1, 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 clamped inside the connecting ring, and a pressure reducing valve is fixedly installed on the top of the outer surface of the copper conduit.

5. The shale gas generating device capable of preventing instantaneous blowout of a high-pressure valve according to claim 1, characterized in that: A communication pipe is fixedly installed at the bottom of the measuring cylinder, and the tail end of the communication pipe is connected to the bottom of the liquid collector.

6. The shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve according to claim 1, characterized in that: Both sides of the limit clamp are threadedly connected with control bolts, the front end of the control bolt is rotatably connected with the positioning clamp, the outer surface of the positioning clamp is provided with a limit slider, and the limit slider is slidably connected to the inner wall of the limit clamp.

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

8. The shale gas generation device capable of preventing instantaneous blowout of a high-pressure valve according to claim 1 is characterized in that: A power block is fixedly installed inside the connection tube, an output end of the power block is electrically connected to an electric heating plate, and the electric heating plate and the through hole are interconnected; The outer surface of the power block is provided with a power line, and the outer surface of the collection bin is threadedly connected with a sealing cover.

9. A method for using a shale gas generating device capable of preventing instantaneous blowout of a high-pressure valve according to any one of claims 1 to 8, characterized in that: The method to prevent instantaneous spraying of high pressure valve is as follows: Step S1: The jack on the horizontal base can apply external pressure to the system, and the measuring cylinder in the clamping ring is connected to the adapter, and 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 is set to a pressure value. When the pressure value is exceeded, the valve releases air to the outside, which protects the system and can adjust the internal pressure of the system. A connecting pipe for draining water and collecting gas is installed at the bottom of the measuring cylinder, a connecting plate is fixedly installed on the inner wall of the fixed frame, and an electric heating furnace is arranged on the outer surface of the reaction cylinder. The use of the electric heating furnace plays a heating role and can quickly heat the system; Step S2: When the device is generating shale gas, for the gas valve at the gas outlet, after the rubber tube and the gas valve are sleeved and installed, the positioning ring on the sliding copper tube is slid, and then the positioning rod is driven to slide, and the positioning rod slides and adjusts the sliding rod, and then the positions of the positioning rod and the sliding rod are slid, and when in use, the distance between the limit clamp and the rubber tube is adjusted by the sliding property of the positioning ring; Step S3: When in use, the limit clamp is slid close to the rubber tube, and the limit clamp is sleeved on the outer surface of the rubber tube by sliding the positioning ring and adjusting the sliding rod and the positioning rod. The positioning clamp is pushed to clamp the rubber tube by rotating the control bolt and the rotation between the control bolt and the positioning clamp. Step S4: The position of the through hole on the plug-in tube 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 film to rupture, allowing the gas to enter the collection chamber as the sealing film ruptures, driving the collection chamber to expand and collect the gas.

Images