CN113667507B - Device for supercritical water and oxygen collaborative pyrolysis of L-shaped columnar organic rock and use method - Google Patents

Abstract

The invention relates to an L-shaped columnar organic rock supercritical water and oxygen synergistic pyrolysis device and a using method, belonging to the technical field of deep unconventional or conventional resource special exploitation; Axial pressure transmission rod, pore pressure application system, oxygen injection system, drainage (salt) system and oil and gas condensation and collection system; the reaction device of the present invention can fully simulate the process of supercritical water in-situ pyrolysis fracturing fractured reservoir, Exploring the mechanism and reaction characteristics of the co-pyrolysis of columnar fracture-bearing organic rocks by supercritical water and oxygen can ensure that the pyrolysis environment of the fracture-bearing rocks is a supercritical environment, and can be heated in stages, which can realize the supercritical decomposition of organic rocks in different regions. The critical water-oxygen pyrolysis reaction allows real-time and efficient separation of oil, gas and water. Oxygen is injected into the pyrolyzed sample through the oxygen injection system. The oxygen flows slowly in the horizontal section, ensuring sufficient reaction with organic rocks and greatly reducing the risk of explosion.

Description

Device and method for co-pyrolysis of L-shaped columnar organic rock with supercritical water and oxygen

technical field

The invention belongs to the technical field of special exploitation of deep unconventional or conventional resources, and in particular relates to a device and a use method for the synergistic pyrolysis of L-shaped columnar organic rock with supercritical water and oxygen.

Background technique

China is very rich in organic-rich rocks (coal, oil shale, etc.). my country's national conditions are poor oil and less gas, and the pyrolysis of organic rocks can form oil and gas products, which is of great significance for alleviating the current oil shortage in my country. The resource reserves of different burial depths are also different. For the ore seam with a shallow burial depth of 500m or more, it can be mined by underground mining or in-situ mining. In-situ mining directly injects high-temperature fluid (>550°C) into the heat injection well. After the organic matter is fully pyrolyzed, the fluid The product can then be drained from the production well. However, for deep-buried ore seams, it is extremely difficult to mine well, and there are serious potential safety hazards. However, in-situ mining is extremely serious due to the transmission of high-temperature fluids in the long-distance wellbore, and the injection of atmospheric or low-pressure high-temperature fluids is not feasible. Supercritical water has the advantages of both liquid and gas, and also has good mass transfer and heat transfer properties. These characteristics make supercritical water often used as an excellent reaction medium. When water is at its critical point (374.3 °C, 22.05MPa) high temperature and high pressure state is called supercritical water, and the overburden stress of the deep buried ore layer is very high, which creates a high pressure environment for the fluid, and its critical temperature (374.3℃) is also much lower than The fluid temperature (550°C) required for the pyrolysis of shallowly buried ore layers, so that the heat dissipation of the wellbore has little effect on the effective pyrolysis of the ore layers. It can be seen that supercritical water in situ pyrolysis of deeply buried ore layers is a particularly feasible solution.

Existing patents in this field include CN 112299546 A, CN 112680246 A, etc., but the existing supercritical water reactors are all cylindrical thick-walled cylindrical structures with a single structure, and their main shortcomings are as follows:

1. The sample cannot be stress loaded, and the supercritical hydropyrolysis reaction under the stress condition of the original rock cannot be realized;

2. Unable to achieve graded heating;

3. The oil, gas and water are completely mixed and cannot be separated simultaneously and in real time;

4. After the oxygen is input into the kettle, it rises vertically rapidly, and it mixes with the pyrolysis gas generated at the top of the cylindrical reactor, resulting in the risk of explosion.

SUMMARY OF THE INVENTION

The invention overcomes the deficiencies of the prior art, proposes a device and a method of using the L-shaped columnar organic rock supercritical water and oxygen co-pyrolysis, and solves the problem that the organic rock supercritical water-oxygen reaction device cannot be loaded, cannot be heated in stages, and is easy to explode, etc. question.

In order to achieve the above objects, the present invention is achieved through the following technical solutions.

L-shaped columnar organic rock supercritical water and oxygen co-pyrolysis device, including parallel connection of L-shaped reactor, supercritical water generation system, axial pressure transmission rod, pore pressure application system, oxygen injection system, drainage (salt) system and oil and gas condensation and collection systems;

The parallel-connected L-type reactor includes a straight-tube reactor and an L-type reactor, and the two parallel-connected positions are provided with a gasket, the area of the straight-tube reactor is a supercritical water-oxygen reaction zone, and the straight-tube reactor is The position close to the gasket is provided with a snap ring, and the snap ring is provided with a porous plate. Wrapped with insulation,

The axial pressure transmission rod is arranged in the straight cylinder reactor and is connected by a first flange, and one end of the axial pressure transmission rod arranged in the straight cylinder reaction kettle is provided with a groove, and the concave The area between the tank and the porous plate constitutes a supercritical water-oxygen reaction zone, the supercritical water-oxygen reaction zone is filled with a pyrolysis sample, and a packing is arranged between the pyrolysis sample and the straight-tube reaction kettle, The area between the perforated plate and the side of the horizontal side of the L-type reactor is a high temperature oil and water area, and the side of the longitudinal side of the L-type reactor is a low temperature gas area;

The bottom of the L-shaped reaction kettle of the high temperature oil-water zone is provided with a drainage (salt) hole, which is connected with the drainage (salt) system, and the straight-tube reaction kettle is provided with a second thermoelectric power at the position close to the perforated plate. Coupled and pressure sensors, the drainage (salt) system includes a second back pressure valve, a valve, a second heat exchanger and a water tank;

One side of the axial transmission rod is provided with a supercritical water injection cavity, which is connected with the supercritical water generation system, and the other side is provided with an air inlet cavity, which is connected with the oxygen injection system. A water circulation cooling chamber is arranged on the pressure transfer rod; the supercritical water generation system includes a water pump, a first one-way valve, a supercritical water generator and a third one-way valve, which are used to pass the supercritical water when the pyrolysis sample is short of water. The water injection chamber injects water into the pyrolysis sample; the oxygen injection system includes an oxygen cylinder and a second one-way valve, which is used to inject oxygen into the pyrolysis sample through the air inlet chamber after the pyrolysis sample begins to produce oil and gas products;

The L-shaped reaction kettle is provided with a hole flush with the axis of the straight-tube reaction kettle, and is connected with the pore pressure application system, above the connection position between the pore pressure application system and the L-shaped reaction kettle A liquid level gauge is provided, and the bottom of the liquid level gauge is flush with the corner position of the L-shaped reaction kettle, the middle and upper part of the L-shaped reaction kettle is provided with a third thermocouple, and the top is provided with a second flange, so The second flange is provided with a safety valve, the oil and gas condensation and collection system includes a gas-water condensation collection device and an oil-water condensation collection device, and the gas-water condensation collection device includes a first back pressure valve, a first heat exchanger and a gas-water separation device, the oil-water condensation collection device includes a third back pressure valve, a third heat exchanger and an oil tank, the second flange is provided with a hole, and communicates with the gas-water condensation collection device, so the The oil-water condensation collection device is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low temperature gas zone; the kettle body of the L-shaped reaction kettle in the low temperature gas zone is provided with a multi-stage water circulation cooling cavity, and the pore pressure exerts The system includes a nitrogen gas cylinder, a pressure gauge and a fourth one-way valve, which is used to inject pore pressure into the parallel-connected L-shaped reactor before the pyrolysis test is carried out.

Further, a snap ring is welded at a position close to the gasket inside the straight-tube reactor.

Further, the length of the supercritical water-oxygen reaction zone is 200mm～500mm, and it is divided into zone I, zone II and zone III for heating. During the pyrolysis process, zone I has the highest temperature, first as the pyrolysis zone, zone II and Zone III is used as a preheating zone; after oxygen injection, zone I is used as an oxidation exothermic zone, zone II is used as a pyrolysis zone, and zone III is used as a preheating zone; after the completion of pyrolysis in zone II, it is used as an oxidation exothermic zone, and zone III is used as a pyrolysis zone .

Further, the pyrolysis sample is a columnar organic rock with cracks, and the outer diameter is smaller than the inner diameter of the straight-tube reactor.

Further, the void pressure is greater than 22.05MPa.

Further, the horizontal pipeline connecting the third back pressure valve and the kettle body of the L-shaped reaction kettle is higher than the bottom end of the liquid level gauge.

The beneficial effects of the present invention relative to the prior art are as follows.

The present invention can fully simulate the process of supercritical water in-situ pyrolysis fracturing fractured reservoirs by designing a reaction device for the co-pyrolysis of L-shaped columnar organic rock with supercritical water and oxygen, and explores the co-pyrolysis of supercritical water and oxygen in columnar cracks containing cracks. The mechanism and reaction characteristics of organic rocks can provide theoretical basis for field practice. Has the following advantages:

1. It can ensure that the pyrolysis environment where the fractured rock is located is a supercritical environment;

2. It can be heated in stages, and can realize the supercritical hydro-oxygen pyrolysis reaction of organic rocks in sub-regions;

3. Oxygen is injected into the pyrolyzed sample through the oxygen injection system. The supercritical water reaction zone is placed horizontally, and the oxygen flows slowly in the horizontal section to ensure sufficient reaction with the organic rock and greatly reduce the risk of explosion;

4. Oil, gas and water can be separated efficiently in real time.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings:

Fig. 1 is the structural representation of the reaction device of the present invention;

Fig. 2 is the schematic diagram of the partition principle structure of the reaction device of the present invention;

Figure 3 is a front view of the axial pressure transmission rod;

Figure 4 is a side view of the axial pressure transmission rod;

In the figure: 1-water pump; 2-first check valve; 3-axial pressure transmission rod; 4-gasket; 5-second check valve; 6-oxygen cylinder; 7-water circulation cooling chamber; 8-first 1 flange; 9—packing; 10—insulation layer; 11—second thermocouple; 12—pressure sensor; 13—supercritical water generator; 14—retaining ring; 15—perforated plate; 16—third thermocouple ; 17—safety valve; 18—first heat exchanger; 19—gas-water separation device; 20—liquid level gauge; 21—second flange; 22—second heat exchanger; 23—water tank; 24—fourth thermocouple; 25—fifth thermocouple; 26—sixth thermocouple; 27—supercritical water injection chamber; 28—intake chamber; 29—first back pressure valve; 30—second back pressure valve; 31—heat Solution sample; 32—valve; 33—third one-way valve; 34—straight cylinder reactor; 35—L-type reactor; 36—fourth one-way valve; 37—pressure gauge; 38—nitrogen cylinder; 39—groove 40—the third back pressure valve; 41—the third heat exchanger; 42—the oil tank; 43—the multistage water circulation cooling chamber; 44—the supercritical water-oxygen reaction zone; 45—the high temperature oil and water zone; 47—gas-water interface; 48—I area; 49—II area; 50—III area.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the protection scope is not limited by this.

L-shaped columnar organic rock supercritical water and oxygen co-pyrolysis device, including parallel connection of L-shaped reactor, supercritical water generation system, axial pressure transmission rod 3, pore pressure application system, oxygen injection system, drainage (salt) systems and oil and gas condensation and collection systems;

The parallel connection of the L-type reactor includes the straight-tube reactor 34 and the L-type reactor 35, and the two parallel positions are provided with a gasket 4, and the area of the straight-tube reactor 34 is the supercritical water-oxygen reaction zone 44. The position close to the gasket 4 inside is provided with a snap ring 14, a porous plate 15 is arranged on the snap ring 14, and a fourth thermocouple 24, a fifth thermocouple 25, and a sixth thermocouple 26 are connected to the kettle body of the straight-tube reactor 34. , and the outer surface is wrapped with a thermal insulation layer 10,

The axial pressure transmission rod 3 is arranged in the straight cylinder reactor 34 and is connected through the first flange 8, and one end of the axial pressure transmission rod 3 arranged in the straight cylinder reaction kettle 34 is provided with a groove 39, and the groove 39 is connected with the porous The area between the plates 15 constitutes a supercritical water-oxygen reaction zone 44. The supercritical water-oxygen reaction zone 44 is filled with a pyrolysis sample 31, and a packing 9 is arranged between the pyrolysis sample 31 and the straight-tube reactor 34. The area between the lateral sides of the L-shaped reaction kettle 35 is a high temperature oil-water zone 45, and the longitudinal side of the L-shaped reaction kettle 35 is a low temperature gas zone 46;

The bottom of the L-shaped reactor 35 of the high-temperature oil-water zone 45 is provided with a drainage (salt) hole, and is connected with the drainage (salt) system, and the straight-tube reactor 34 is provided with a second thermocouple 11 at a position close to the perforated plate 15. and the pressure sensor 12, the drainage (salt) system includes a second back pressure valve 30, a valve 32, a second heat exchanger 22 and a water tank 23;

One side of the axial transmission rod is provided with a supercritical water injection cavity 27, which is connected with the supercritical water generation system, and the other side is provided with an air intake cavity 28, which is connected with the oxygen injection system. The axial pressure transmission rod 3 is provided with There is a water circulation cooling chamber 7; the supercritical water generation system includes a water pump 1, a first one-way valve 2, a supercritical water generator 13 and a third one-way valve 33, which are used to pass the supercritical water when the pyrolysis sample 31 is short of water. The injection chamber 27 injects water into the pyrolysis sample 31; the oxygen injection system includes an oxygen cylinder 6 and a second one-way valve 5 for injecting oxygen into the pyrolysis sample 31 through the air inlet chamber 28 after the pyrolysis sample 31 begins to produce oil and gas products;

The L-type reactor 35 is provided with a hole at the level of the axis of the straight-tube reactor 34, and is connected with the pore pressure application system, and a liquid level gauge 20 is provided above the connection position between the pore pressure application system and the L-type reactor 35, And the bottom of the liquid level gauge 20 is flush with the corner position of the L-type reactor 35, the middle and upper part of the L-type reactor 35 is provided with a third thermocouple 16, the top is provided with a second flange 21, and the second flange 21 is provided with a third thermocouple 16. A safety valve 17 is provided. The oil and gas condensation and collection system includes a gas-water condensation collection device and an oil-water condensation collection device. The gas-water condensation collection device includes a first back pressure valve 29, a first heat exchanger 18 and a gas-water separation device 19. The collection device includes a third back pressure valve 40, a third heat exchanger 41 and an oil tank 42. The second flange 21 is provided with holes and communicated with the gas-water condensation collection device. The oil-water condensation collection device is located in the low-temperature gas zone 46. The lower part of the still body of the L-type reaction still 35; the still body of the L-type reaction still 35 in the low temperature gas zone 46 is provided with a multi-stage water circulation cooling chamber 437, and the pore pressure application system includes a nitrogen bottle 38, a pressure gauge 37 and a fourth unit. The valve 36 is used to inject pore pressure into the interior of the parallel-connected L-shaped reactor 35 before the pyrolysis test is carried out.

Further, a snap ring 14 is welded inside the straight-tube reactor 34 at a position close to the gasket 4 .

Further, the length of the supercritical water-oxygen reaction zone 44 is 200mm to 500mm, which is divided into zone I 48, zone II 4948 and zone III 504948 for subsection heating. During the pyrolysis process, zone I 48 has the highest temperature, which is first used as a pyrolysis zone. , II zone 4948 and III zone 504948 are used as preheating zone; after oxygen injection, I zone 48 is used as oxidation exothermic zone, II zone 4948 is used as pyrolysis zone, III zone 504948 is used as preheating zone; II zone 4948 is used as oxidation zone after pyrolysis is completed Exothermic zone, zone III 504948 as the pyrolysis zone.

Further, the pyrolysis sample 31 is a columnar organic rock with cracks, and the outer diameter is smaller than the inner diameter of the straight-tube reactor 34 .

Further, the void pressure is greater than 22.05MPa.

Further, the horizontal pipeline connecting the third back pressure valve 40 with the kettle body of the L-shaped reactor 35 is higher than the bottom end of the liquid level gauge 20 .

Example 1

When the burial depth of the ore bed is 900m and the heat injection temperature is 400°C, the specific operation steps of the reaction device of the present invention are as follows:

1. The perforated plate 15 is placed on the snap ring 14 of the straight-tube reactor 34, and the columnar crack-containing organic rock is filled and placed, and the high-temperature-resistant packing 9 is tightly filled in the gap between the pyrolysis sample 31 and the straight-tube reactor 34;

2. Fix the high temperature and high pressure first flange 8, squeeze the packing (9) through the groove 39 at the bottom of the axial pressure transmission rod 3, and apply a pressure of 23.4MPa to the block sample;

3. Connect the straight-tube reactor 34, the L-type reactor 35, the drainage (salt) system and the oil and gas condensing system with the collection system, and set up the first back pressure valve 29, the second back pressure valve 30 and the third back pressure valve that are resistant to high temperature The pressure of 33 is 23.4MPa, and the pressure of safety valve 17 is set to 30MPa;

4. The pore pressure of 23.4MPa is injected into the high temperature and high pressure parallel reaction kettle through the pore pressure application system;

5. Wrap the thermal insulation layer 10 on the outer layer of the straight-tube reactor 34, and connect with the supercritical water generation system and the oxygen injection system at the same time, and pass circulating water into the water circulation cooling chamber 7 and the multi-stage water circulation cooling chamber 43;

6. Prepare supercritical water with a pressure of 23.4MPa and a temperature of 400°C by the supercritical water generator 13, and inject it into the pyrolysis sample 31. During the heating process of the sample, observe whether there is any gas product at the outlet of the gas-water separation device 19. When there is continuous production of gaseous products, stop injecting supercritical water after a period of time, make full use of the return water in the L-type reactor 35 to supplement the sample with water, and inject oxygen into the sample through the oxygen injection system to make the oxygen and supercritical water. The pyrolysis carbon residue in zone I of the critical water-oxygen reaction zone reacts and releases heat, thereby serving as the heat source for the pyrolysis of the sample in zone II, while monitoring the second thermocouple 11, the third thermocouple 16, the fourth thermocouple 24, the fifth thermocouple The temperature change of the thermocouple 25 and the sixth thermocouple 26 can reasonably reduce the preparation temperature of the supercritical water generator according to the temperature change;

7. The injection of supercritical water and the injection of oxygen are performed alternately. When the steam-water interface is within the visible range, the oil and water are collected by the oil-water condensation collecting device, and the collected oil and water are in the oil tank 42. When the steam-water interface is too low, the Supercritical water is injected into the sample 31, so that the steam-water interface is always kept in the observable section of the liquid level gauge 20;

8. When the outlet of the gas-water separation device 19 cannot produce gas and the gas-water interface of the liquid level gauge 20 has no oil layer, the test is stopped, and the high temperature and high pressure valve 32 is opened to discharge sewage and salt. After the temperature of the parallel-connected high-temperature and high-pressure reactors is lowered to room temperature, the straight-tube reactor 34 and the L-shaped reactor 35 are split, and the pyrolysis sample 31 is taken out, and the test is completed.

Example 2

When the burial depth of the ore bed is 1200m and the heat injection temperature is 380°C, the specific operation steps of the reaction device of the present invention are as follows:

1. Place the perforated plate 15 on the snap ring 14 of the straight-tube reactor 34, place the columnar crack-containing organic rock 31 on the perforated plate 15, and at the same time tightly fill the pyrolysis sample 31 and the straight-tube reactor 34 with the high temperature resistant packing. gap;

2. Fix the high temperature and high pressure first flange 8, squeeze the packing 9 through the groove 39 at the bottom of the axial pressure transmission rod 3, and apply a pressure of 30MPa to the block sample;

3. Connect the straight-tube reactor 34, the L-type reactor 35, the drainage (salt) system and the oil and gas condensing system with the collection system, and set up the first back pressure valve 29, the second back pressure valve 30 and the third back pressure valve that are resistant to high temperature The pressure of 33 is 30MPa, and the pressure of safety valve 17 is set to 35MPa;

4. The pore pressure of 30MPa is injected into the parallel high temperature and high pressure reactor through the pore pressure application system;

5. Wrap the thermal insulation layer 10 on the outer layer of the straight-tube reactor 34, and connect with the supercritical water generation system and the oxygen injection system at the same time, and pass circulating water into the water circulation cooling chamber 7 and the multi-stage water circulation cooling chamber 43;

6. Prepare supercritical water with a pressure of 30MPa and a temperature of 380°C by the supercritical water generator 13, and inject it into the pyrolysis sample 31. During the heating process of the sample, observe whether there is gas product output at the outlet of the gas-water separation device 19. , when there is continuous production of gaseous products, stop injecting supercritical water after a period of time, make full use of the backwater in the L-type reactor 35 to supplement the sample with water, and inject oxygen into the sample through the oxygen injection system to make the oxygen and supercritical water. The pyrolysis carbon residue in zone I of the water-oxygen reaction zone reacts and releases heat, thereby serving as the heat source for the pyrolysis of the sample in zone II, while monitoring the second thermocouple 11, the third thermocouple 16, the fourth thermocouple 24, and the fifth thermocouple. The temperature change of the couple 25 and the sixth thermocouple 26 can reasonably reduce the preparation temperature of the supercritical water generator according to the temperature change;

7. The injection of supercritical water and the injection of oxygen are performed alternately. When the steam-water interface is within the visible range, the oil and water are collected by the oil-water condensation collecting device, and the collected oil and water are in the oil tank 42. When the steam-water interface is too low, the Supercritical water is injected into the sample 31, so that the steam-water interface is always kept in the observable section of the liquid level gauge 20;

8. When the outlet of the gas-water separation device 19 cannot produce gas and the gas-water interface of the liquid level gauge 20 has no oil layer, the test is stopped, and the high temperature and high pressure valve 32 is opened to discharge sewage and salt. After the temperature of the parallel-connected high-temperature and high-pressure reactors is lowered to room temperature, the straight-tube reactor 34 and the L-shaped reactor 35 are split, and the pyrolysis sample 31 is taken out, and the test is completed.

The invention can realize the grading reaction of supercritical water, and is used to simulate the process and characteristics of supercritical water in-situ high-efficiency pyrolysis and fracturing of fractured organic rocks and real-time oil and gas production. It needs to be greater than 374.3 ° C. During the specific operation, the pressure, temperature and other parameters of the reaction device are adaptively adjusted according to the depth of the mine and the heat injection temperature. Among them, the first back pressure valve 29 and the second back pressure valve 30 , The set pressure of the third back pressure valve 33 should be higher than 22.05MPa.

The above content is a further detailed description of the present invention in combination with the specific preferred embodiments, and it cannot be considered that the specific embodiments of the present invention are limited to this. Below, some simple deductions or substitutions can also be made, all of which should be regarded as belonging to the invention and the scope of patent protection determined by the submitted claims.

Claims (7)

1. the device of L-type columnar organic rock supercritical water and oxygen synergistic pyrolysis, is characterized in that, comprises parallel connection L-type reactor, supercritical water generation system, axial pressure transmission rod, pore pressure application system, oxygen injection system , Drainage and salt discharge system and oil and gas condensation and collection system; The parallel-connected L-type reactor includes a straight-tube reactor and an L-type reactor, and a gasket is provided at the position where the two are connected in parallel. The area of the straight-tube reactor is a supercritical water-oxygen reaction zone, and the supercritical water-oxygen The reaction zone is divided into zone I, zone II and zone III. During the pyrolysis process, zone I has the highest temperature, which is first used as a pyrolysis zone, and zone II and zone III are used as preheating zones; after oxygen injection, zone I is used as an oxidation exothermic zone , the II zone is used as the pyrolysis zone, and the III zone is used as the preheating zone; after the completion of the pyrolysis in the II zone, it is used as the oxidation exothermic zone, and the III zone is used as the pyrolysis zone; the interior of the straight-tube reactor is provided with a snap ring near the gasket , the snap ring is provided with a perforated plate, the kettle body of the straight-tube reaction kettle is connected with a fourth thermocouple, a fifth thermocouple, and a sixth thermocouple, and the outer surface is wrapped with a thermal insulation layer, The axial pressure transmission rod is arranged in the straight cylinder reactor and is connected by a first flange, and one end of the axial pressure transmission rod arranged in the straight cylinder reaction kettle is provided with a groove, and the concave The area between the tank and the porous plate constitutes a supercritical water-oxygen reaction zone, the supercritical water-oxygen reaction zone is filled with a pyrolysis sample, and a packing is arranged between the pyrolysis sample and the straight-tube reaction kettle, The area between the perforated plate and the side of the horizontal side of the L-type reactor is a high temperature oil and water area, and the side of the longitudinal side of the L-type reactor is a low temperature gas area; The bottom of the L-shaped reaction kettle of the high temperature oil and water area is provided with a drainage and salt discharge hole, and is connected with the drainage and salt discharge system, and the position of the straight-tube reaction kettle close to the porous plate is provided with a second thermocouple and a pressure sensor, the drainage and salt discharge system includes a second back pressure valve, a valve, a second heat exchanger and a water tank; One side of the axial pressure transmission rod is provided with a supercritical water injection cavity, which is connected with the supercritical water generation system, and the other side is provided with an air inlet cavity, which is connected with the oxygen injection system. A water circulation cooling chamber is arranged on the pressure transfer rod; the supercritical water generation system includes a water pump, a first check valve, a supercritical water generator and a third check valve, which are used to pass the supercritical water when the pyrolysis sample is short of water. The critical water injection chamber injects water into the pyrolysis sample; the oxygen injection system includes an oxygen cylinder and a second one-way valve, which is used to inject oxygen into the pyrolysis sample through the air inlet chamber after the pyrolysis sample begins to produce oil and gas products; The L-shaped reaction kettle is provided with a hole flush with the axis of the straight-tube reaction kettle, and is connected with the pore pressure application system, above the connection position between the pore pressure application system and the L-shaped reaction kettle A liquid level gauge is provided, and the bottom of the liquid level gauge is flush with the corner position of the L-shaped reaction kettle, the middle and upper part of the L-shaped reaction kettle is provided with a third thermocouple, and the top is provided with a second flange, so The second flange is provided with a safety valve, the oil and gas condensation and collection system includes a gas-water condensation collection device and an oil-water condensation collection device, and the gas-water condensation collection device includes a first back pressure valve, a first heat exchanger and a gas-water separation device, the oil-water condensation collection device includes a third back pressure valve, a third heat exchanger and an oil tank, the second flange is provided with a hole, and communicates with the gas-water condensation collection device, so the The oil-water condensation collection device is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low temperature gas zone; the kettle body of the L-shaped reaction kettle in the low temperature gas zone is provided with a multi-stage water circulation cooling cavity, and the pore pressure exerts The system includes a nitrogen gas cylinder, a pressure gauge and a fourth one-way valve, which is used to inject pore pressure into the parallel-connected L-shaped reactor before the pyrolysis test is carried out. 2 . The device for co-pyrolysis of L-shaped columnar organic rock with supercritical water and oxygen according to claim 1 , wherein a snap ring is welded inside the straight-tube reactor near the gasket. 3 . 3. The device for co-pyrolysis of L-shaped columnar organic rock supercritical water and oxygen according to claim 1, wherein the length of the supercritical water-oxygen reaction zone is 200mm～500mm. 4. the device of L-type columnar organic rock supercritical water and oxygen synergistic pyrolysis according to claim 1, is characterized in that, described pyrolysis sample is the columnar organic rock containing cracks, and the outer diameter is less than the still of straight cylinder reactor body diameter. 5 . The device for co-pyrolysis of L-shaped columnar organic rock with supercritical water and oxygen according to claim 1 , wherein the pore pressure is greater than 22.05 MPa. 6 . 6. the device of L-type columnar organic rock supercritical water and oxygen synergistic pyrolysis according to claim 1, is characterized in that, the level that described 3rd back pressure valve is connected with the still body of described L-type reactor The line is above the bottom end of the level gauge. 7. according to the using method of the arbitrary described device of claim 1～6, it is characterized in that, operating step is: (1) Place a perforated plate on the retaining ring of the straight-tube reactor, and fill the pyrolysis sample, and at the same time tightly fill the packing in the gap between the pyrolysis sample and the straight-tube reactor; (2) Fix the first flange, squeeze the packing through the groove at the bottom of the axial pressure transmission rod, and apply pressure to the sample; (3) Connect the straight-tube reaction kettle, the L-shaped reaction kettle, the drainage and salt discharge system and the oil and gas condensing system to the collection system, and set the pressure of the first back pressure valve, the second back pressure valve, the third back pressure valve and the pressure of the safety valve; (4) The pore pressure is injected into the high temperature and high pressure parallel reactor through the pore pressure application system; (5) Wrap the insulation layer on the outer layer of the straight-tube reactor, and connect it with the supercritical water generation system and the oxygen injection system at the same time, and pass the circulating water into the water circulation cooling chamber and the multi-stage water circulation cooling chamber; (6) Prepare supercritical water through a supercritical water generator, inject it into the pyrolysis sample, and observe whether there is gas product output at the outlet of the gas-water separation device during the heating process of the sample. After a period of time, stop injecting supercritical water, make full use of the backwater in the L-type reactor to replenish the sample with water, inject oxygen into the sample through the oxygen injection system, and monitor the second thermocouple, the third thermocouple, the fourth thermocouple, and the fourth thermocouple. The temperature change of the thermocouple, the fifth thermocouple and the sixth thermocouple can reasonably reduce the preparation temperature of the supercritical water generator according to the temperature change; (7) Alternately perform supercritical water injection and oxygen injection. When the steam-water interface is within the visible range, collect oil and water through the oil-water condensation collection device. When the steam-water interface is too low, inject supercritical water into the sample; (8) When the outlet of the gas-water separation device cannot produce gas and there is no oil layer at the gas-water interface of the liquid level gauge, the test is stopped, the valve is opened, and the sewage and salt are discharged; (9) The temperature of the L-type reactor to be connected in parallel is lowered to room temperature, the straight-tube reactor and the L-type reactor are separated, and the pyrolysis sample is taken out, and the test is completed.

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