WO2021082224A1

WO2021082224A1 - Natural gas hydrate mineral fracturing experiment device

Info

Publication number: WO2021082224A1
Application number: PCT/CN2019/126577
Authority: WO
Inventors: 李栋梁; 姚远欣; 梁德青
Original assignee: 中国科学院广州能源研究所
Priority date: 2019-10-28
Filing date: 2019-12-19
Publication date: 2021-05-06
Also published as: CN110927358A; CN110927358B

Abstract

A natural gas hydrate mineral fracturing experiment device, comprising a support (1) and a reactor (2) disposed on the support (1) for synthesizing a sample and performing fracturing transformation on the sample. The reactor (2) is provided with a sample synthesis system (3), a permeability testing system (4), and a data acquisition and control system (6). A hydraulic fracturing system (5) used for performing the fracturing transformation is further disposed in the reactor (2). The device can synthesize natural gas hydrate sediments in situ under high-pressure and low-temperature conditions, perform fracturing experiments on the sediments, and measure the permeability thereof, thereby expanding the application range of existing experimental testing devices. In addition, the device can reasonably simulate reservoir ground stress and temperature and pressure conditions, can relatively completely restore conventional hydraulic fracturing operation steps such as liquid injection, fracturing, and propping agent addition, and can also measure changes in reservoir permeability before and after the fracturing and under different fracturing conditions and observe the fracturing effect.

Description

Fracturing experimental device for natural gas hydrate deposit

Technical field

The invention relates to a fracturing experiment device for natural gas hydrate deposits. The device is a device that can synthesize natural gas hydrate deposits in situ under high pressure and low temperature conditions, perform fracturing experiments on the deposits, and measure the permeability .

Background technique

Natural gas hydrate is an ice-like solid formed by alkanes (such as methane, ethane, etc.) and water under certain high pressure and low temperature conditions. It is commonly known as combustible ice and is widely distributed below the surface of the tundra and under the seabed of the continental margin. In the sediment. The global reserves of natural gas hydrate are huge, equivalent to 210.5 billion tons of oil equivalent, which is twice the total carbon content of conventional fossil energy in the world, and is regarded as an important alternative energy source after the oil age.

In the process of natural gas hydrate development, after the hydrate is decomposed by mining methods such as pressure reduction, heat injection, and chemical injection, the permeability of the reservoir will directly affect the flow rate of gas and water between the pores after the hydrate is decomposed. This in turn affects the efficiency of gas production and recovery, so increasing the permeability of the reservoir is of great significance to the commercial exploitation of natural gas hydrates.

The hydraulic fracturing stimulation technology in the reservoir reconstruction technology has been widely used in the oil and gas industry, which can greatly increase the permeability of oil and gas reservoirs and realize the increase in oil and gas production in low-permeability and ultra-low-permeability oil and gas fields. Since the low permeability of natural gas hydrate reservoirs is similar to that of low-permeability gas fields such as shale gas fields, in order to increase the production of natural gas in natural gas hydrate deposits, some studies are currently exploring the use of hydraulic fracturing to increase the permeability of hydrate reservoirs. However, there are few existing simulation experiments for hydraulic fracturing of gas hydrate sediments, and there is a lack of experimental devices that can simulate the complete hydraulic fracturing process and can measure changes in reservoir permeability after fracturing. The inability to simulate the real in-situ stress and reservoir temperature and pressure conditions restricts the development of hydraulic fracturing stimulation technology for natural gas hydrate deposits. The permeability of natural gas hydrate deposits under conventional storage conditions is very low, which is not conducive to natural gas production. Therefore, an experimental device is required to simulate the use of hydraulic fracturing to reconstruct the gas hydrate deposits to produce high-permeability fracturing channels. Improve reservoir permeability.

Summary of the invention

Aiming at the shortcomings of the prior art, the present invention provides a fracturing experimental device for natural gas hydrate deposits.

In order to achieve the above objective, the technical solution of the present invention is:

A fracturing experiment device for natural gas hydrate deposits, comprising a support and a reactor set on the support for synthesizing samples and fracturing and reforming them, and the reactor is provided with a sample synthesis system, a permeability testing system, and data An acquisition and control system. The reactor is also provided with a hydraulic fracturing system for fracturing reformation.

Further, the reactor includes a reactor cylinder and a reactor end cover arranged at one end of the reactor cylinder, the reactor cylinder is used to place a sample of hydrate sediment, and the sample synthesis system is arranged in the reactor. The end of the cylinder is far away from the end cover of the reactor, the space between the sample synthesis system, the reactor cylinder and the end cover of the reactor forms an inner cavity, and a second is arranged between the end cover of the reactor and the hydrate sediment sample. A water-permeable plate, and a second water-permeable plate is arranged between the sample synthesis system and the hydrate sediment sample.

Further, the sample synthesis system includes a piston that abuts against the second water-permeable plate, a sealing plug arranged at an end of the reactor cylinder away from the end cover of the reactor, and a side of the reactor cylinder connected between the piston and the sealing plug. The manual booster pump on the wall is provided with a booster valve between the manual booster pump and the reactor cylinder.

Further, the permeability test system includes a first gas pipeline connected to the inner cavity of one end of the reactor end cover, a first constant pressure system connected to the first gas pipeline, and one end connected to the sample synthesis system A second gas pipeline in the inner cavity, a second constant pressure system connected to the second gas pipeline, and a flow meter connected to the second constant pressure system, the first gas pipeline is provided with a first valve, so The second gas pipeline is provided with a second valve, the first constant pressure system and the first gas pipeline support are provided with a constant pressure valve, the flow meter is connected with a flow valve, the first constant pressure system and A differential pressure sensor is connected between the second constant pressure system, and the differential pressure sensor and the flow meter are both connected to the data acquisition and control system.

Further, the permeability test system is also connected with an evacuation system and a gas cylinder for supplying gas to the reaction and providing gas for testing the permeability, and the evacuation system and the gas cylinder are both connected to the first gas pipeline, so A vacuum valve is arranged between the vacuum system and the first gas pipeline, and an air supply valve is arranged between the gas cylinder and the first gas pipeline.

Further, the hydraulic fracturing system includes a hydraulic jet tube connected from the side wall of the reactor barrel to the inner cavity, and a fracturing pump system connected with the hydraulic jet tube. The outlet direction of the hydraulic jet tube is the same as that of the reactor. The axial directions of the reactor are consistent, the water jet pipe is provided with a sanding device, and a fracturing valve is provided between the sanding device and the side wall of the reactor cylinder.

Further, the data acquisition and control system includes a computer and a temperature sensor and a pressure sensor connected to the computer, the temperature sensor is arranged on the end cover of the reactor to collect temperature parameter data inside the cavity, and the pressure sensor is connected It is set on the sample synthesis system, permeability testing system and hydraulic fracturing system to collect the pressure parameter data of each system.

Further, it also includes a photographic lighting system arranged on the side wall at the corresponding position of the inner cavity of the reactor barrel, and the photographic lighting system includes a side wall of the reactor barrel for observing the internal condition of the inner cavity. The sapphire tube and the camera and illuminating lamp connected to the reactor tube body, the lens of the camera is directly facing the sapphire tube, so as to observe the internal situation of the inner cavity.

Compared with the prior art, the present invention has the following advantages:

The invention can synthesize natural gas hydrate deposits in situ under high-pressure and low-temperature conditions, perform fracturing experiments on the deposits, and measure the permeability, which expands the scope of use of existing experimental testing devices and improves the accuracy of experimental testing And convenience. The design of this application supports in-situ synthesis of hydrate sediment samples, can reasonably simulate reservoir stress and temperature and pressure conditions, and can more completely restore conventional hydraulic fracturing steps such as fluid injection, fracturing, and proppant addition. It can also measure the changes in reservoir permeability before and after fracturing and under different fracturing conditions and observe the fracturing effect, which has a certain guiding role in the study of the fracturing mechanism of gas hydrate sediments and the changes in reservoir permeability before and after fracturing. .

Description of the drawings

Figure 1 is a schematic diagram of the overall connection structure of the fracturing experimental device for natural gas hydrate deposits;

Fig. 2 is an enlarged schematic diagram of the connection structure of the permeability test system of part A in Fig. 1;

Description of Reference Signs: 1. Support; 2. Reactor; 21. Reactor cylinder; 22. Reactor end cover; 23. Hydrate sediment sample; 24. Second permeable plate; 25. First permeable plate; 3. Sample synthesis system; 31. Piston; 32. Seal plug; 33. Manual booster pump; 34. Pressure booster valve; 4. Permeability test system; 41. First gas pipeline; 411. First valve; 42 , The second gas pipeline; 421, the second valve; 43, the first constant pressure system; 431, the constant pressure valve; 44, the second constant pressure system; 45, the differential pressure sensor; 46, the vacuum system; 461, the pumping Vacuum valve; 47. Gas cylinder; 471. Gas supply valve; 5. Hydraulic fracturing system; 51. Hydraulic jet tube; 52. Fracturing pump system; 53, Sand adding device; 54, Fracturing valve; 6. Data acquisition And control system; 61, computer; 62, temperature sensor; 63, pressure sensor; 7, photographic lighting system; 71, camera; 72, lighting; 73, sapphire tube.

Detailed ways

In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, an experimental device for fracturing a natural gas hydrate deposit includes a support 1 and a reactor 2 set on the support 1 for synthesizing samples and fracturing them. The reactor 2 is equipped with a sample synthesis System 3, permeability test system 4, photographic lighting system 7 and data acquisition and control system 6. The reactor 2 is also provided with a hydraulic fracturing system 5 for fracturing reformation.

The structure of the reactor 2 includes a reactor barrel 21 and a reactor end cover 22 arranged at one end of the reactor barrel 21. The reactor barrel 21 is a cylindrical cylindrical structure and is vertically fixed on the support 1. The reactor The end cap 22 is arranged on the top of the reactor cylinder 21, and the reactor cylinder 21 is used to place a hydrate sediment sample 23. The reactor end cover 22 and the reactor cylinder 21 are fixedly connected by bolts, and the reactor cylinder 21 and the support 1 are fixedly connected by nuts and bolts to ensure that the reactor cylinder 21 is in the process of synthesizing samples and conducting permeability tests. And it can be kept fixed during hydraulic fracturing. Wheels are added to the bottom of the bracket 1 to facilitate the overall movement. In order to improve the stability of the device during use, the wheels can be equipped with brakes to avoid slippage.

The sample synthesis system 3 includes a piston 31 slidably arranged inside the reactor cylinder 21, a sealing plug 32 sealingly arranged at the bottom of the reactor cylinder 21, a manual booster pump 33, and a reactor cylinder between the piston 31 and the sealing plug 32 The internal space of the body 21 forms a closed space. The manual booster pump 33 is connected to the sealed space. The piston 31 moves upwards when pressurizing, and the piston 31 moves downwards when depressurizing. The manual booster pump 33 and the reactor cylinder 21 are connected with each other. A booster valve 34 is also provided.

The internal space between the piston 31, the reactor cylinder 21 and the reactor end cover 22 forms an inner cavity, which is used to place the hydrate deposit sample 23 of the synthetic hydrate deposit, and the reactor end cover 22 and the hydrate deposit A first water-permeable plate 25 is provided between the sample 23 and a second water-permeable plate 24 is provided between the piston 31 and the hydrate deposit sample 23. The permeability of the first permeable plate 25 and the second permeable plate 24 is much higher than that of the hydrate sediment, which can well block the sediment and gravel from entering the pipeline and effectively transmit the axial pressure.

As shown in Figure 2, the permeability test system 4 includes a first gas pipeline 41 connected to the inner cavity of one end of the reactor end cover 22, a first constant pressure system 43 connected to the first gas pipeline 41, and a connection The second gas pipeline 42 in the inner cavity at one end of the sample synthesis system 3, the second constant pressure system 44 connected to the second gas pipeline 42 and the flow meter connected to the second constant pressure system 44, the first constant pressure The system 43 and the second constant pressure system 44 are used to adjust the internal pressure values at both ends of the reactor 2, and the flow meter is used for permeability testing to record the flow rate to calculate the sediment permeability. The first gas pipeline 41 is provided with a first valve 411, and the second gas pipeline 42 is provided with a second valve 421. Both the first valve 411 and the second valve 421 are used to control the sealing of the internal space of the reactor 2. A constant pressure system 43 and the first gas pipeline 41 are provided with a constant pressure valve 431, the flow meter is connected with a flow valve, and a differential pressure sensor 45 is connected between the first constant pressure system 43 and the second constant pressure system 44, The differential pressure sensor 45 is used to reflect the pressure difference between the top and the bottom of the reactor 2. The differential pressure sensor 45 and the flow meter are both connected to the data acquisition and control system 6 to facilitate overall data monitoring and testing.

The permeability testing system 4 is also connected to a vacuuming system 46 and a gas cylinder 47 for supplying gas to the reaction and providing gas for testing the permeability. The gas provided by the gas cylinder 47 is a supersaturated gas (such as methane), and the vacuuming system 46 Both the gas cylinder and the gas cylinder 47 are connected to the first gas pipeline 41, a vacuum valve 461 is provided between the vacuum system 46 and the first gas pipeline 41, and a gas supply valve is provided between the gas cylinder 47 and the first gas pipeline 41 471. The vacuum system 46 is used to extract the air inside the reactor 2 and then use the gas cylinder 47 to supply air to the inside of the reactor 2 to ensure the purity of the gas inside and exhaust the interference of other gases.

As shown in Figure 1, the hydraulic fracturing system 5 is arranged on the side of the reactor barrel 21, which includes a hydraulic jet tube 51 connected from the side wall of the reactor barrel 21 to the inner cavity and connected with the hydraulic jet tube 51 The fracturing pump system 52 is equipped with a sand adding device 53 on the hydraulic jet tube 51. The fracturing pump system 52 sets the fracturing fluid and proppant into the hydrate sediment through the hydraulic jet tube 51 at high pressure. The hydraulic jet tube The outlet direction of 51 should be consistent with the axial direction of the reactor 2, and a fracturing valve 54 is provided between the sand adding device 53 and the side wall of the reactor cylinder 21.

The photographic lighting system 7 is arranged on the side wall at the corresponding position of the inner cavity of the reactor cylinder 21, which includes a sapphire cylinder 73 arranged on the side wall of the reactor cylinder 21 for observing the internal conditions of the inner cavity and connected to the reaction The camera 71 and the illuminating lamp 72 on the cylinder 21, the side wall of the reactor cylinder 21 at the end is directly replaced by the sapphire cylinder 73, and the sapphire cylinder 73 is fixed to the reactor 2 with bolts and nuts to make it It is fixed at the corresponding position to better observe the internal situation. The lens of the camera 71 is facing the sapphire tube 73 to observe and record the internal situation of the inner cavity.

The data acquisition and control system 6 includes a computer 61 and a temperature sensor 62 and a pressure sensor 63 connected to the computer 61. The temperature sensor 62 is arranged on the end cover 22 of the reactor to collect temperature parameter data inside the cavity. The pressure sensor 63 is connected and arranged On the sample synthesis system 3, the permeability test system 4 and the hydraulic fracturing system 5, the pressure parameter data of each system is collected. At the same time, the computer 61 is also connected with the differential pressure sensor 45 and the flow meter, which can photograph the test process in the whole process to record the pressure. Fracturing fracture changes and fracturing effects during the fracturing process.

The specific experimental steps of this device are divided into the following 6 steps:

(1) Sample loading

Before testing, tighten the bolts fixing the sapphire cylinder 73, remove the bolts outside the reactor end cover 22, remove the reactor end cover 22, and install the second permeable plate 24 at the bottom of the reactor 2. Cover the hole of the hydraulic jet tube 51 with a thin rubber film to prevent sediment sand from entering the hydraulic jet tube 51, and then put a hydrate sediment sample 23 with a certain moisture content into the inner cavity, pile up and install the reactor 2 The upper first water-permeable plate 25 is covered with the reactor end cap 22 and the bolts are tightened. The data acquisition and control system and the computer 61 start to monitor the reaction process.

(2) Sample synthesis

In order to eliminate the interference of residual air in the device, close the constant pressure valve 431, the air supply valve 471, the fracturing valve 54, the boost valve 34, and the second valve 421, connect the vacuum system 46 to the first air pipeline 41, and open the vacuum pump. The vacuum system 46, the first valve 411 and the vacuum valve 461 start to vacuum the device, and the vacuum is completed after about 15 minutes; after the vacuum is completed, the vacuum system 46 and the vacuum valve 461 are closed. Open the gas supply valve 471, the constant pressure valve 431 and the constant pressure system, connect the gas cylinder 47 to inject supersaturated gas (such as methane), and maintain a certain pore pressure. Then open the booster valve 34, and use the manual pressure regulating pump to push the piston 31 to apply a certain axial pressure to the hydrate deposit sample 23 to form the hydrate deposit sample 23, and reduce the temperature in the reactor 2 to 1°C, etc. After the pressure is equalized, turn on the constant temperature bath.

(3) Permeability test of hydrate sediment before fracturing

After the reaction is completed, close the gas supply valve 471, the booster valve 34 and the first valve 411, pre-cool the hydrate deposits for a period of time, open the first valve 411, the second valve 421, the flow meter and the flow valve, and open the supply valve. The gas valve 471 pumps a certain pressure of gas into the reactor 2, and then simultaneously opens the first constant pressure system 43, the second constant pressure system 44 and the valves located at both ends of the reactor 2, and opens the differential pressure sensor 45. By observing the differential pressure The sensor 45 constantly adjusts the constant pressure at both ends of the reactor 2 so that the upper end of the reactor 2 is always greater than the lower end of the reactor 2 by a certain stable pressure value, and the gas percolation experiment is performed. When the exhaust flow rate displayed by the flowmeter is stable, the average flow rate is calculated , Used to calculate sediment permeability.

(4) Hydraulic fracturing test

After the permeability test is over, close the gas cylinder 47, the gas supply valve 471, the flow meter, the flow valve, the second valve 421, and the first valve 411. When the pressure at both ends of the reactor 2 is equal again, turn on the illumination lamp 72 and the camera 71. Open the fracturing valve 54 connected to the fracturing pump system 52, and then quickly open the fracturing pump system 52 and the sanding device 53 to control the sanding rate, and the fracturing pump system 52 will discharge the colored fracturing fluid and proppant at a certain pressure Into the hydraulic jet tube 51, the high-pressure liquid jet from the hydraulic jet tube 51 breaks through the thin rubber film and impacts the hydrate sediment sample 23, fracturing the hydrate sediment sample 23 out of cracks, and the camera 71 records in front of the sapphire tube 73 After the fracturing process, the fracturing operation is stopped, and the valve and the fracturing pump system 52 are closed.

(5) Permeability test of hydrate sediment after fracturing

After the fracturing test is completed, open the valve of the gas cylinder 47 to pump a certain pressure of gas into the reactor 2, open the flow meter valve, and then open the constant pressure system at both ends of the reactor 2 at the same time, and constantly adjust the constant pressure at both ends by observing the differential pressure sensor 45. The upper end of the reactor 2 is always higher than the lower end of the reactor 2 by a certain stable pressure value. The gas percolation experiment is carried out. At first, part of the fracturing fluid will be discharged. When the exhaust flow of the flowmeter is stable, the average flow rate is calculated to calculate the deposition.物Permeability.

After the fracturing test is completed, open the first valve 411, the second valve 421, the flow meter and the flow valve, and open the gas supply valve 471 to pump a certain pressure of gas into the reactor 2, and then open the first two ends of the reactor 2 at the same time. Constant pressure system 43, second constant pressure system 44, constant pressure valve 431 and second valve 421, open the differential pressure sensor 45, and constantly adjust the constant pressure at both ends of the reactor 2 by observing the differential pressure sensor 45 to make the upper end of the reactor 2 Always a certain stable pressure value greater than the lower end of the reactor 2 for gas percolation experiments. At first, part of the fracturing fluid will be discharged. When the exhaust flow of the flow meter is stable, the average flow rate is measured to calculate the sediment permeability.

(6) Change the temperature and pressure conditions

Change the temperature or pressure of the sediment and fracturing fluid, and proceed to the next round of testing.

The above are all the specific use steps of this device. The invention can synthesize natural gas hydrate deposits in situ under high pressure and low temperature conditions, perform fracturing experiments on the deposits, and measure the permeability, which expands the existing experimental test devices. The range of use improves the accuracy and convenience of experimental testing. The design of this application supports the in-situ synthesis of hydrate sediment sample 23, can reasonably simulate the reservoir stress and temperature and pressure conditions, and can more completely restore the conventional hydraulic fracturing operation steps such as fluid injection, fracturing, and proppant addition. It can also measure the changes in reservoir permeability before and after fracturing and under different fracturing conditions and observe the fracturing effect. It provides certain guidance for the study of the fracturing mechanism of gas hydrate sediments and the changes in reservoir permeability before and after fracturing. effect.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement them accordingly, and should not limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention should be covered by the protection scope of the present invention.

Claims

An experimental device for fracturing a natural gas hydrate deposit, which is characterized by comprising a support (1) and a reactor (2) arranged on the support (1) for synthesizing samples and fracturing them. (2) A sample synthesis system (3), a permeability test system (4), and a data acquisition and control system (6) are provided on the reactor (2). The reactor (2) is also provided with hydraulic pressure for fracturing reformation. Split system (5).
The fracturing experimental device for natural gas hydrate deposits according to claim 1, characterized in that: the reactor (2) comprises a reactor cylinder (21) and a reactor end arranged at one end of the reactor cylinder (21) A cover (22) for placing a hydrate sediment sample (23) in the reactor cylinder (21), and the sample synthesis system (3) is arranged on the reactor cylinder (21) away from the reactor end cover ( 22), the space between the sample synthesis system (3), the reactor cylinder (21) and the reactor end cover (22) forms an inner cavity, and the reactor end cover (22) is deposited with hydrate A first permeable plate (25) is arranged between the sample (23), and a second permeable plate (24) is arranged between the sample synthesis system (3) and the hydrate sediment sample (23).
The natural gas hydrate deposit fracturing experiment device according to claim 2, characterized in that: the sample synthesis system (3) comprises a piston (31) that is opposed to the second permeable plate (24), and is arranged in the reactor cylinder (21) Manual pressurization on the sealing plug (32) at the end away from the end cover (22) of the reactor and the side wall of the reactor cylinder (21) connected between the piston (31) and the sealing plug (32) A pump (33), a boost valve (34) is arranged between the manual booster pump (33) and the reactor cylinder (21).
The natural gas hydrate deposit fracturing experiment device according to claim 2, characterized in that: the permeability test system (4) comprises a first gas transmission in the inner cavity connected to one end of the reactor end cover (22) The pipeline (41), the first constant pressure system (43) connected to the first gas pipeline (41), the second gas pipeline (42) in the cavity connected to one end of the sample synthesis system (3), and the A second constant pressure system (44) connected to the second gas pipeline (42) and a flow meter connected to the second constant pressure system (44), the first gas pipeline (41) is provided with a first valve (411) ), the second gas pipeline (42) is provided with a second valve (421), the first constant pressure system (43) and the first gas pipeline (41) bracket (1) are provided with a constant pressure valve (431), the flow meter is connected with a flow valve, and a differential pressure sensor (45) is connected between the first constant pressure system (43) and the second constant pressure system (44), the differential pressure sensor (45) ) And the flow meter are both connected to the data acquisition and control system (6).
The natural gas hydrate deposit fracturing experiment device according to claim 4, characterized in that: the permeability test system (4) is also connected with a vacuum system (46) and used to supply gas to the reaction and provide test permeability The gas cylinder (47) of the gas, the vacuum system (46) and the gas cylinder (47) are both connected to the first gas pipeline (41), and the vacuum system (46) is connected to the first gas pipeline (41). A vacuum valve (461) is arranged between ), and an air supply valve (471) is arranged between the gas cylinder (47) and the first gas pipeline (41).
The fracturing experimental device for natural gas hydrate deposits according to claim 2, characterized in that: the hydraulic fracturing system (5) comprises a hydraulic jet pipe connected from the side wall of the reactor cylinder (21) to the inner cavity (51) and a fracturing pump system (52) connected with a hydraulic jet tube (51), the outlet direction of the hydraulic jet tube (51) is consistent with the axial direction of the reactor (2), and the hydraulic jet tube (51) ) Is provided with a sanding device (53), and a fracturing valve (54) is provided between the sanding device (53) and the side wall of the reactor cylinder (21).
The natural gas hydrate deposit fracturing experiment device according to claim 2, characterized in that: the data acquisition and control system (6) comprises a computer (61) and a temperature sensor (62) connected to the computer (61) and pressure Sensor (63), the temperature sensor (62) is arranged on the end cover (22) of the reactor to collect temperature parameter data inside the cavity, and the pressure sensor (63) is connected to the sample synthesis system (3), The permeability testing system (4) and the hydraulic fracturing system (5) are used to collect the pressure parameter data of each system.
The natural gas hydrate deposit fracturing experiment device according to claim 2, characterized in that it further comprises a photographic lighting system (7) arranged on the side wall at the corresponding position of the inner cavity of the reactor cylinder (21), so The photographic lighting system (7) includes a sapphire cylinder (73) arranged on the side wall of the reactor cylinder (21) for observing the conditions inside the cavity and a camera (71) connected to the reactor cylinder (21) And an illuminating lamp (72), the lens of the camera (71) is directly facing the sapphire tube (73) to observe the internal situation of the inner cavity.