Ocean carbon storage sealing performance testing device

Abstract

The utility model discloses a marine carbon storage sealing performance testing device, and relates to the field of carbon storage sealing performance testing, the marine carbon storage sealing performance testing device comprises a storage tank, the top end of the storage tank is provided with a pair of discharge ports, the two discharge ports are respectively communicated with a discharge pipe and a return pipe, and the interiors of the two discharge ports are provided with adjusting mechanisms; the other end of the discharging pipe is communicated with the input end of a carbon dioxide pump, the output end of the carbon dioxide pump is communicated with a three-way valve, one outlet of the three-way valve is communicated with the other end of the backflow pipe, and the other outlet of the three-way valve is communicated with a feeding pipe. According to the device, the pressure of the return pipe, the pressure of the discharging pipe, the pressure of the feeding pipe and the pressure of the storage tank are detected through the two first pressure sensors, the pressure of the pressure gauge and the pressure of the second pressure sensor respectively, so that whether leakage exists at the positions or not is judged, and then the stability and the sealing performance of the pipeline are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of carbon storage sealing performance testing, and particularly to a marine carbon storage sealing performance testing device. Background Art

[0002] With the continuous exploitation of traditional energy sources such as oil and natural gas, some old oil and gas fields have entered the middle and late stages of development. Especially for some low-permeability oil reservoirs, the recovery rate of traditional exploitation methods is generally not higher than 25%. Therefore, improving the recovery rate has become the choice of most oil companies at home and abroad. At present, the methods for improving the recovery rate at home and abroad include thermal methods, chemical methods, gas injection methods, and microbial methods, etc. Their oil displacement mechanisms are mainly to reduce the mobility ratio and interfacial tension between the displacement fluid and crude oil, so as to improve the displacement sweep range and oil washing efficiency.

[0003] Among them, the carbon dioxide flooding technology is to inject carbon dioxide into the oil reservoir to improve the oil recovery rate. The International Energy Agency evaluates that the resources suitable for carbon dioxide flooding development in the world are about 300 billion - 600 billion barrels. Since carbon dioxide is a gas with high solubility in both oil and water, when it dissolves in crude oil in large quantities, it can cause the volume of crude oil to expand, the viscosity to decrease, and can also reduce the interfacial tension between oil and water. Compared with other oil displacement technologies, carbon dioxide flooding has the advantages of a large applicable range, low oil displacement cost, and significant improvement in oil recovery rate. This technology can not only meet the needs of oil field development, but also solve the problem of carbon dioxide sequestration and protect the atmospheric environment.

[0004] In actual use, carbon dioxide needs to use a pipeline system to be transported from the ground to the injection point of the subsea oil field. These pipelines need to be strictly designed and tested to ensure stability and sealing performance under high pressure and changing environments. Based on this, this solution provides a marine carbon storage sealing performance testing device to solve the above-mentioned problems. Summary of the Utility Model

[0005] To solve the above technical problems, a marine carbon storage sealing performance testing device is provided, and this technical solution solves the problems proposed in the above background art.

[0006] To achieve the above purposes, the technical solution adopted by the utility model is as follows:

[0007] An ocean carbon storage airtightness testing device includes a storage tank. A feed inlet is provided at the lower end of the storage tank, and a pair of discharge outlets are provided at the top of the storage tank. The two discharge outlets are respectively communicated with a discharge pipe and a return pipe, and adjusting mechanisms are arranged inside the two discharge outlets. A control valve is fixedly installed on the surface of the discharge pipe. The other end of the discharge pipe is communicated with the input end of a carbon dioxide pump. The output end of the carbon dioxide pump is communicated with the inlet of a three-way valve through a connecting pipe. One outlet of the three-way valve is communicated with the other end of the return pipe. A return valve is fixedly installed on the surface of the return pipe. The other outlet of the three-way valve is communicated with a feeding pipe. A pressure gauge, a one-way valve, a main valve and a flowmeter are sequentially installed on the surface of the feeding pipe.

[0008] Preferably, a pair of discharge channels are fixedly connected inside the storage tank, and the two discharge channels are respectively arranged directly below the two discharge outlets.

[0009] Preferably, the adjusting mechanism includes a motor and a threaded rod. The motor is fixedly installed at the top of the discharge outlet. The output end of the motor penetrates into the inside of the discharge outlet and is fixedly connected with the threaded rod. A sealing bearing is arranged at the connection between the motor and the discharge outlet. A sleeve is threadedly connected to the surface of the threaded rod. The lower end of the sleeve extends into the inside of the discharge channel and is fixedly connected with a sealing piston. The outer side end of the sealing piston is slidably connected with the inner wall of the discharge channel.

[0010] Preferably, a first pressure sensor is fixedly installed on the upper side of the surface of the sleeve, and a limiting rod is fixedly connected to the lower side of the surface of the sleeve. The other end of the limiting rod is slidably connected with a limiting groove formed on the inner wall of the discharge outlet.

[0011] Preferably, a second pressure sensor is fixedly installed below the top plate of the storage tank, and the second pressure sensor is located between the two discharge channels.

[0012] Compared with the prior art, the present utility model provides an ocean carbon storage airtightness testing device, which has the following

[0013] Advantages:

[0014] 1. The utility model drives a carbon dioxide pump to extract liquid carbon dioxide through a discharge pipe. Subsequently, the reflux valve is opened and the main valve is closed, so that the liquid carbon dioxide is transported into the reflux pipe and the feeding pipe, and flows back to the storage tank through the reflux pipe. When the pressure in the pipe reaches a certain level, two adjusting mechanisms are started. The motor drives the threaded rod to rotate, and the rotation of the threaded rod drives the sleeve to move, so that the sleeve drives the sealing piston to move towards the discharge channel, thereby sealing the two discharge channels, and closing the control valve and the reflux valve. Subsequently, the pressure of the reflux pipe, the discharge pipe, the feeding pipe and the storage tank is detected by two first pressure sensors, a pressure gauge and a second pressure sensor respectively, so as to judge whether there is leakage at this position, and further ensure the stability and sealing performance of the device under high pressure and changing environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 is a schematic diagram of the structure of the adjusting mechanism in the utility model.

[0017] The reference numerals in the figure are:

[0018] 1. Storage tank; 101. Discharge channel; 2. Discharge port; 3. Feed port; 4. Adjusting mechanism; 401. Motor; 402. Threaded rod; 403. Sleeve; 404. First pressure sensor; 405. Sealing piston; 406. Limiting rod; 5. Discharge pipe; 501. Control valve; 6. Reflux pipe; 601. Reflux valve; 7. Carbon dioxide pump; 8. Three-way valve; 9. Second pressure sensor; 10. Pressure gauge; 11. Check valve; 12. Main valve; 13. Flowmeter; 14. Feeding pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0020] Refer to Figure 1As shown in the figure, an ocean carbon storage sealing test device includes a storage tank 1. A feed inlet 3 is provided at the lower end of the storage tank 1, and a pair of discharge outlets 2 are provided at the top of the storage tank 1. The two discharge outlets 2 are respectively communicated with a discharge pipe 5 and a reflux pipe 6, and adjustment mechanisms 4 are arranged inside both of the two discharge outlets 2. A control valve 501 is fixedly installed on the surface of the discharge pipe 5. The other end of the discharge pipe 5 is communicated with the input end of a carbon dioxide pump 7. The output end of the carbon dioxide pump 7 is communicated with the inlet of a three-way valve 8 through a connecting pipe. One outlet of the three-way valve 8 is communicated with the other end of the reflux pipe 6. A reflux valve 601 is fixedly installed on the surface of the reflux pipe 6. The other outlet of the three-way valve 8 is communicated with a feed pipe 14. A pressure gauge 10, a check valve 11, a main valve 12, and a flowmeter 13 are successively installed on the surface of the feed pipe 14. This device drives the carbon dioxide pump 7 to extract liquid carbon dioxide through the discharge pipe 5. Subsequently, the reflux valve 601 is opened and the main valve 12 is closed, so that the liquid carbon dioxide is transported into the reflux pipe 6 and the feed pipe 14 and flows back into the storage tank 1 through the reflux pipe 6. When the pressure in the pipe reaches a certain level, the two adjustment mechanisms 4 are started to seal the two discharge channels 101, and the control valve 501 and the reflux valve 601 are closed. Subsequently, the pressure of the reflux pipe 6, the discharge pipe 5, the feed pipe 14, and the storage tank 1 is respectively detected by two first pressure sensors 404, the pressure gauge 10, and a second pressure sensor 9, so as to judge whether there is leakage at this position, and further ensure the stability and sealing performance of the device under high pressure and changing environments.

[0021] Specifically, in this embodiment, a pair of discharge channels 101 are fixedly connected inside the storage tank 1, and the two discharge channels 101 are respectively arranged directly below the two discharge outlets 2.

[0022] Specifically, in this embodiment, the adjustment mechanism 4 includes a motor 401 and a threaded rod 402. The motor 401 is fixedly installed at the top of the discharge outlet 2. The output end of the motor 401 penetrates into the inside of the discharge outlet 2 and is fixedly connected with the threaded rod 402. A sealing bearing is arranged at the connection between the motor 401 and the discharge outlet 2. A sleeve 403 is threadedly connected to the surface of the threaded rod 402. The lower end of the sleeve 403 extends into the inside of the discharge channel 101 and is fixedly connected with a sealing piston 405. The outer side end of the sealing piston 405 is slidably connected with the inner wall of the discharge channel 101. The adjustment mechanism 4 drives the threaded rod 402 to rotate through the motor 401. Then, the rotation of the threaded rod 402 drives the sleeve 403 to move, and the movement of the sleeve 403 drives the sealing piston 405 to move. When the sealing piston 405 moves into the discharge channel 101, the discharge channel 101 is blocked and sealed. After the sealing is completed, it is detected by the first pressure sensor 404, and whether there is leakage is judged through the pressure change.

[0023] Specifically, in this embodiment, a first pressure sensor 404 is fixedly installed on the upper side of the surface of the sleeve 403. A limiting rod 406 is fixedly connected to the lower side of the surface of the sleeve 403. The other end of the limiting rod 406 is slidably connected to a limiting groove formed on the inner wall of the discharge port 2. During the movement of the sleeve 403, the sleeve 403 is limited and guided by the limiting rod 405, so that it moves along a predetermined trajectory, avoiding deviation, which may cause a gap in the sealing piston 405 and result in sealing failure.

[0024] Specifically, in this embodiment, a second pressure sensor 9 is fixedly installed on the lower side of the top plate of the storage tank 1. The second pressure sensor 9 is located between the two discharge channels 101. In this device, the two first pressure sensors 404, the second pressure sensor 9, and the pressure gauge can all use sensors that can achieve this function in the prior art without limitation. They all judge whether there is leakage in the pipeline or the storage tank through pressure changes.

[0025] The working principle of the present utility model is as follows: This device drives the carbon dioxide pump 7 to pump liquid carbon dioxide out through the discharge pipe 5. Subsequently, the return valve 601 is opened and the main valve 12 is closed, so that the liquid carbon dioxide is transported into the return pipe 6 and the feeding pipe 14, and returns to the storage tank 1 through the return pipe 6. When the pressure in the pipe reaches a certain level, two adjusting mechanisms 4 are started: The adjusting mechanism 4 drives the threaded rod 402 to rotate through the motor 401. Then, the rotation of the threaded rod 402 drives the sleeve 403 to move. The movement of the sleeve 403 further drives the sealing piston 405 to move. When the sealing piston 405 moves to the discharge channel 101, the discharge channel 101 is blocked and sealed. After the sealing is completed, the control valve 501 and the return valve 601 are closed. Subsequently, the two first pressure sensors 404, the pressure gauge 10, and the second pressure sensor 9 are used to detect the pressure of the return pipe 6, the discharge pipe 5, the feeding pipe 14, and the storage tank 1 respectively, so as to judge whether there is leakage at this position, thereby ensuring the stability and sealing performance of the device under high pressure and changing environments.

[0026] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection required by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A marine carbon storage sealing test device, characterized in that: The invention comprises a storage tank (1), wherein a feed port (3) is arranged at the lower end of the storage tank (1), and a pair of discharge ports (2) are arranged at the top end of the storage tank (1), wherein the two discharge ports (2) are respectively connected to a discharge pipe (5) and a return pipe (6), and an adjustment mechanism (4) is arranged inside the two discharge ports (2), a control valve (501) is fixedly installed on the surface of the discharge pipe (5), and the other end of the discharge pipe (5) is connected to the input end of a carbon dioxide pump (7), and the The output end of the carbon dioxide pump (7) is connected to the inlet of the three-way valve (8) through a connecting pipe, one of the outlets of the three-way valve (8) is connected to the other end of the reflux pipe (6), a reflux valve (601) is fixedly installed on the surface of the reflux pipe (6), and the other outlet of the three-way valve (8) is connected to the feed pipe (14), and a pressure gauge (10), a one-way valve (11), a main valve (12) and a flow meter (13) are installed on the surface of the feed pipe (14) in sequence.

2. The marine carbon storage sealing test device according to claim 1, characterized in that: A pair of discharge channels (101) are fixedly connected inside the storage tank (1), and the two discharge channels (101) are respectively arranged at the lower ends of the two discharge ports (2).

3. The marine carbon storage sealing test device according to claim 1, characterized in that: The adjusting mechanism (4) comprises a motor (401) and a threaded rod (402); the motor (401) is fixedly mounted at the top of the discharge port (2); the output end of the motor (401) passes through the interior of the feed port (2) and is fixedly connected to the threaded rod (402); a sealing bearing is provided at the connection between the motor (401) and the discharge port (2); a sleeve (403) is threadedly connected to the surface of the threaded rod (402); the lower end of the sleeve (403) extends into the interior of the feed port (101) and is fixedly connected to a sealing piston (405); the outer end of the sealing piston (405) is slidably connected to the inner wall of the discharge channel (101).

4. The marine carbon storage sealing test device according to claim 3, characterized in that: A first pressure sensor (404) is fixedly mounted on the upper surface of the sleeve (403), and a limiting rod (406) is fixedly connected to the lower surface of the sleeve (403), and the other end of the limiting rod (406) is slidably connected to a limiting groove provided on the inner wall of the discharge port (2).

5. The marine carbon storage sealing test device according to claim 1, characterized in that: A second pressure sensor (9) is fixedly mounted on the lower side of the top plate of the storage tank (1), and the second pressure sensor (9) is located between the two discharge channels (101).

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