An integrated device for gas pressure relief and purification in the interlayer of lined pipe

Abstract

The utility model belongs to the field of trenchless pipeline repair, and specifically relates to an integrated device for gas pressure relief and purification in the interlayer of a lined pipeline, which includes a first electric valve, a second electric valve, a first pressure gauge, a second pressure gauge, an electric balancing valve, an electric emergency pressure relief valve and a gas purification device; wherein the first electric valve and the second electric valve are arranged at intervals; the first pressure gauge is connected to the first electric valve through a first air pipe, and the second pressure gauge is connected to the second electric valve through a second air pipe; the electric balancing valve is connected between the first air pipe and the second air pipe, the electric emergency pressure relief valve is connected to the second air pipe, and the gas purification device is connected to the outlet of the emergency pressure relief valve. The utility model can integrate balanced pressure, emergency pressure relief, gas purification and remote control, and avoid the occurrence of bulging and collapse of the liner pipe and the discharge of harmful gases to pollute the environment.

Description

Technical Field

[0001] The utility model belongs to the field of trenchless pipeline repair, and in particular relates to an integrated device for decompression and purification of interlayer gas in a liner pipeline. Background Art

[0002] The corrosion environment in oil and gas pipelines is complex. As the service time increases, metal pipelines will fail due to corrosion and perforation, which not only causes oil and gas leakage and affects normal production, but also brings safety and environmental risks. The replacement of the entire pipeline with severe corrosion is not only costly and time-consuming, but also restricted by pipeline laying restrictions such as buildings or waters. Therefore, in actual production, low-cost, efficient and environmentally friendly pipeline lining repair technology (the lining pipe is generally made of thermoplastic materials such as HDPE or HTPO) is usually used to repair damaged pipelines. Pipeline lining repair technology, also known as pipeline trenchless repair technology, refers to the multi-stage equal-diameter compression of the lining pipe with the same outer diameter as the inner diameter of the metal pipe to be repaired, and the lining pipe with a smaller outer diameter is pulled into the old metal pipe through a traction device. Finally, it is restored to its original shape by heating, pressurizing or natural recovery, so that the lining pipe fits tightly with the metal pipe to be repaired, thereby repairing the metal pipe.

[0003] However, some problems have also arisen during the use of pipeline lining repair technology. When the gathering and transportation pipeline is working at full load, in a high temperature and high pressure environment, the gas molecules accelerate and hit the inner lining pipe wall, and the gas penetration into the interlayer between the inner lining pipe and the metal pipe will occur, and the gas penetration reaches a state of equilibrium when the pressure in the interlayer is equal to the pressure in the pipeline. However, when the pipeline conveying medium is depressurized or transportation production is stopped, the pressure in the pipeline drops, the pressure in the interlayer is greater than the pressure in the pipeline, and the interlayer gas pressure exerts radial pressure on the inner lining pipe, causing the inner lining pipe to bulge or collapse, the inner lining pipe to fail, and the pipeline to be blocked, affecting the normal transportation of oil and gas and even causing safety accidents.

[0004] The existing device for eliminating the interlayer gas pressure between the inner liner pipe and the metal pipe is shown in a steel pipe inner liner repair joint connection structure disclosed in the Chinese patent document with the authorization announcement number CN218564743U, which includes a pipeline, a connection structure and an inner liner pipe. The pipeline is connected to the inner liner pipe, and a gas detection and processing device is provided at the end of the pipeline; the gas detection and processing device includes an exhaust valve and a gas purification device; the two sections of the interlayer are connected through an air guide channel, and finally the gas is uniformly discharged from the pipeline to relieve the pressure of the interlayer gas, and the pressure relief is processed by the gas detection and processing device to produce toxic small molecule gas. However, this device can only detect the gas pressure in the interlayer, but cannot monitor the pressure difference between the pipeline and the interlayer during decompression or shutdown in real time, and thus cannot effectively judge whether to open the exhaust valve for pressure relief according to the actual situation. In severe cases, it will still cause the inner liner pipe to bulge and collapse. Moreover, when this device is used for pressure relief, the interlayer gas needs to be completely discharged, which will produce a large amount of harmful gas that needs to be purified, increasing the purification cost.

[0005] The existing device for eliminating the pressure of the interlayer gas between the liner pipe and the metal pipe is also shown in a device and installation method for eliminating the negative pressure of the liner non-metallic pipe disclosed in the Chinese patent document with the authorization announcement number CN114427633B, which includes a pipeline, a connecting pipeline, an upper clamp, an inner liner pipe, a support pipe, a lower clamp, and a check valve structure; the pipeline is fixedly connected to the connecting pipeline, and the upper and lower clamps are installed on the connecting pipeline; the outer wall of the inner liner pipe contacts the inner wall of the pipeline and the connecting pipeline, and the support pipe is installed on the inner wall of the inner liner pipe; a check valve structure is arranged inside the upper clamp; the check valve structure is connected to the inside of the pipeline in one way and connected to the joint between the inner liner pipe and the connecting pipeline in the other way, and the fluid that has leaked between the metal pipeline and the inner liner pipe flows back to the inside of the pipeline through the check valve structure to achieve the pressure relief of the interlayer gas. However, when the pressure difference is too large, this method cannot achieve pressure balance between the interlayer and the pipeline in a short time, and the inner liner pipe still has the possibility of bulging and collapse. In addition, this method does not provide an emergency pressure relief valve. When the check valve opens abnormally, not only will the interlayer gas pressure continue to rise and collapse, but also because no gas purification device is provided, the interlayer gas pressure will continue to rise and leak harmful gases to the outside, polluting the environment and harming the human body. Utility Model Content

[0006] The utility model provides an integrated device for relieving and purifying the interlayer gas pressure of a liner pipe, so as to solve the technical problems of bulging and collapse of the liner pipe and discharge of harmful gases that pollute the environment in the above-mentioned existing devices for eliminating the interlayer gas pressure between the liner pipe and the metal pipe.

[0007] In order to solve the above problems, the utility model provides an integrated device for gas pressure relief and purification in the interlayer of a lined pipe, which adopts the following technical solutions:

[0008] The integrated device for pressure relief and purification of gas in the interlayer of a lined pipe comprises: a first electric valve, used for sealing at a reserved hole installed on the inner liner pipe; a second electric valve, arranged at an interval from the first electric valve, used for sealing at a reserved hole installed in a medium pipe; a first pressure gauge, connected to the first electric valve through a first air pipe, so as to detect the pressure of the gas in the inner liner pipe when the first electric valve is opened; a second pressure gauge, connected to the second electric valve through a second air pipe, so as to detect the pressure of the gas in the interlayer formed by the inner liner pipe and the medium pipe when the second electric valve is opened; an electric balancing valve, connected between the first air pipe and the second air pipe, used for balancing the gas pressure in the inner liner pipe and the interlayer; an electric emergency pressure relief valve, connected to the second air pipe; a gas purification device, connected to the outlet of the emergency pressure relief valve, used for purifying the gas discharged from the interlayer.

[0009] Furthermore, the first electric valve and the second electric valve are both needle valves.

[0010] Furthermore, an electric emergency pressure relief valve is arranged downstream of the electric balancing valve.

[0011] Furthermore, the first air pipe and the second air pipe are metal pipes.

[0012] Furthermore, the first pressure gauge and the second pressure gauge are both remote pressure gauges.

[0013] The beneficial effects of the utility model are:

[0014] When the utility model is used in a specific application, the integrated device for gas pressure relief and purification in the interlayer of a lined pipe can be externally connected to a remote control system to realize remote control.

[0015] When it is detected that the air pressure in the interlayer is different from the air pressure in the liner, the balancing valve is used to balance the air pressure in the interlayer and the liner. When the pressure difference is too large and the balancing valve cannot achieve pressure balance between the interlayer and the liner in a short time, or when the balancing valve fails / malfunctions, the electric emergency pressure relief valve is activated through the remote control system, and the released gas is processed by the gas purification device to become environmentally friendly and harmless gas that can be discharged.

[0016] The utility model is a diversified device integrating pressure balance, emergency pressure relief, gas purification and remote control. It not only solves the problem of pressure difference between the air pressure in the interlayer and the air pressure in the liner pipe caused by pipeline pressure fluctuation or displacement change during normal operation of the pipeline; it also solves the problem that when the pipeline stops transporting, the air pressure in the liner pipe is instantly zero, and the pressure difference between the air pressure in the interlayer and the air pressure in the liner pipe is too large, and the interlayer gas pressure needs to be relieved in a short time; it also solves the problem of environmental pollution caused by harmful gases released by pressure relief and high gas purification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 This is a schematic diagram of the installation of an integrated gas pressure relief and purification device for the interlayer of a lined pipe.

[0019] Description of reference numerals:

[0020] 1. Lining pipe; 2. Medium pipeline; 3. First reserved hole; 4. Second reserved hole; 5. First electric valve; 6. Second electric valve; 7. First air pipe; 8. Second air pipe; 9. First pressure gauge; 10. Second pressure gauge; 11. Electric balancing valve; 12. Electric emergency pressure relief valve; 13. Gas purification device; 14. Interlayer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] Various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0023] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0024] The utility model provides an embodiment of the integrated device for gas pressure relief and purification in the interlayer of the lined pipe:

[0025] like Figure 1 As shown, the integrated device for gas pressure relief and purification in the interlayer of the lined pipe is used to be installed at the pipe section of the medium pipeline 2 that has been repaired by the interlayer liner pipe 1, and includes a first electric valve 5, a second electric valve 6, a first pressure gauge 9, a second pressure gauge 10, an electric balancing valve 11, an electric emergency pressure relief valve 12 and a gas purification device 13.

[0026] In this embodiment, the first electric valve 5 and the second electric valve 6 used are needle valves. Of course, in other embodiments, devices such as ball valves and slide valves that can control the flow or stop of fluid media can also be used; the first pressure gauge 9 and the second pressure gauge 10 used are both remote pressure gauges. The first electric valve 5, the second electric valve 6, the first pressure gauge 9, the second pressure gauge 10, the electric balance valve 11 and the emergency pressure relief valve are all connected to the computer remote control system, which can remotely monitor the air pressure in the medium pipeline 2 and the interlayer 14, and remotely control the opening or closing of the electric balance valve 11 and the emergency pressure relief valve.

[0027] The medium pipeline 2 is a metal pipeline, and the liner pipe 1 is made of HDPE high-density polyethylene. The medium pipeline 2 is repaired by the liner pipe 1. The liner pipe 1 is tightly attached to the medium pipeline 2, and a gap interlayer 14 exists between the liner pipe 1 and the medium pipeline 2.

[0028] A first reserved hole 3 is provided on the medium pipeline 2, and the first reserved hole 3 passes through the interlayer 14 between the medium pipeline 2 and the inner liner 1. The first electric valve 5 is installed at the first reserved hole 3 and sealed. The first electric valve 5 is connected to the first pressure gauge 9 through the first air pipe 7, so that the first pressure gauge 9 is connected to the air pressure in the inner liner 1, thereby realizing real-time monitoring of the air pressure in the inner liner 1.

[0029] A second reserved hole 4 is provided on the medium pipeline 2 near the first reserved hole 3. The second reserved hole 4 is provided above the interlayer 14 between the medium pipeline 2 and the inner liner 1. The second electric valve 6 is installed at the second reserved hole 4 and sealed. The second electric valve 6 is connected to the second pressure gauge 10 through the second air pipe 8, so that the second pressure gauge 10 is connected to the air pressure in the interlayer 14 between the medium pipeline 2 and the inner liner 1, thereby realizing real-time monitoring of the air pressure in the interlayer 14. The first air pipe 7 and the second air pipe 8 in this embodiment are both metal pipes. Of course, non-metal pipes can also be used in other embodiments.

[0030] The electric balancing valve 11 is connected between the first air pipe 7 and the second air pipe 8, and the electric emergency pressure relief valve 12 is connected to the second air pipe 8 and is located downstream of the electric balancing valve 11. Of course, in other embodiments, the electric emergency pressure relief valve 12 can also be located upstream of the electric balancing valve 11.

[0031] The gas purification device 13 is connected to the outlet of the emergency pressure relief valve and is used to purify the gas discharged from the interlayer 14. In this embodiment, the gas purification device 13 is a common air purification device in the prior art, which can eliminate gases such as carbon dioxide, carbon monoxide, methane, and hydrogen sulfide. Its specific structure and working principle will not be described in detail here.

[0032] After the medium pipeline 2 is repaired and the integrated gas pressure relief and purification device for the inner liner interlayer of the utility model is installed, the first electric valve 5, the second electric valve 6, the electric balancing valve 11 and the electric emergency pressure relief valve 12 are all in a closed state. After the inner liner 1 has been running for a period of time, the first electric valve 5 and the second electric valve 6 are opened through the remote control system, and the first pressure gauge 9 and the second pressure gauge 10 can respectively monitor the air pressure in the inner liner 1 and the air pressure in the interlayer 14 in real time.

[0033] When the air pressure in the interlayer 14 is higher than the air pressure in the medium pipeline 2, the electric balancing valve 11 automatically opens, and the gas in the interlayer 14 will flow back to the inner liner pipe 1 through the electric balancing valve 11 because its air pressure is higher than the air pressure in the medium pipeline 2. The reflux of this part of gas can achieve the purpose of decompression of the gas in the interlayer 14. It is different from the method in the prior art that this part of gas needs to be purified and discharged out of the device to achieve decompression of the gas in the interlayer 14, thereby reducing the cost of gas purification.

[0034] When it is detected that the air pressure in the interlayer 14 is higher than the air pressure in the inner liner 1, and the pressure difference between the two reaches the preset value for opening the emergency pressure relief valve set in the remote control system, since the pressure difference between the air pressure in the interlayer 14 and the air pressure in the inner liner 1 is too large at this time, the electric balancing valve 11 cannot complete the pressure relief of the interlayer 14 in a short time, then when the electric balancing valve 11 is opened, the electric emergency pressure relief valve 12 is automatically opened, and a part of the gas in the high-pressure interlayer 14 flows back into the inner liner 1 through the electric balancing valve 11, and a part of the gas passes through the electric emergency pressure relief valve 12 and enters the gas purification device 13 to be treated as harmless gas and then discharged out of the device. In this way, when the pressure difference between the air pressure in the interlayer 14 and the air pressure in the inner liner 1 is too large, the gas in the interlayer 14 can be depressurized in a relatively short time, thereby eliminating the possibility of bulging or collapse of the inner liner 1 due to the excessive pressure difference between the air pressure in the interlayer 14 and the air pressure in the inner liner 1 and the inability to complete the pressure relief in a short time. In addition, when the remote control system detects an abnormal change in the air pressure difference between the air pressure in the inner liner pipe 1 and the air pressure in the interlayer 14, and the electric balancing valve 11 fails or fails, the electric emergency pressure relief valve 12 automatically opens, and the gas in the interlayer 14 passes through the electric emergency pressure relief valve 12, is processed into harmless gas by the gas purification device 13, and is discharged out of the device, thereby achieving pressure relief of the gas in the interlayer 14 when the electric balancing valve 11 fails or fails.

[0035] When it is detected that the air pressure in the interlayer 14 is balanced with the air pressure in the inner liner pipe 1 and there is substantially no air pressure difference between the two, the electric balancing valve 11 and the electric emergency pressure relief valve 12 are automatically restored to the closed state.

[0036] The utility model is a diversified device integrating pressure balance, emergency pressure relief, gas purification and remote control. It not only solves the problem of pressure difference between the air pressure in the interlayer 14 and the air pressure in the inner liner pipe 1 caused by pipeline pressure fluctuation or displacement change during normal operation of the pipeline; it also solves the problem that when the pipeline stops transporting, the air pressure in the inner liner pipe 1 is instantly zero, and the pressure difference between the air pressure in the interlayer 14 and the air pressure in the inner liner pipe 1 is too large, and the gas pressure in the interlayer 14 needs to be relieved in a short time; it also solves the problem of environmental pollution caused by harmful gases released by pressure relief and high gas purification cost.

Claims

1. An integrated device for gas pressure relief and purification in the interlayer of a lined pipe, characterized in that: include: The first electric valve is used for sealing the reserved hole installed on the inner liner pipe; The second electric valve is arranged at a distance from the first electric valve and is used for sealing and installing at a reserved hole of the medium pipeline; a first pressure gauge connected to the first electric valve through a first air pipe to detect the pressure of the gas in the liner pipe when the first electric valve is opened; a second pressure gauge connected to the second electric valve through a second air pipe to detect the pressure of the gas in the interlayer formed by the liner pipe and the medium pipeline when the second electric valve is opened; An electric balancing valve, connected between the first gas pipe and the second gas pipe, for balancing the gas pressure of the liner pipe and the interlayer; An electric emergency pressure relief valve connected to the second air pipe; A gas purification device is connected to the outlet of the emergency pressure relief valve and is used for purifying the gas discharged from the interlayer.

2. The integrated device for gas pressure relief and purification in the interlayer of a lined pipe according to claim 1 is characterized in that: The first electric valve and the second electric valve are both needle valves.

3. The integrated device for gas pressure relief and purification in the interlayer of a lined pipe according to claim 1, characterized in that: The electric emergency pressure relief valve is arranged downstream of the electric balancing valve.

4. The integrated device for gas pressure relief and purification in the interlayer of a lined pipe according to claim 1 or 3, characterized in that: The first air pipe and the second air pipe are metal pipes and have excellent corrosion resistance.

5. The integrated device for gas pressure relief and purification in the interlayer of a lined pipe according to claim 1, characterized in that: The first pressure gauge and the second pressure gauge are both remote pressure gauges.

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