Oil discharge system

Abstract

The utility model discloses an oil discharge system, relates to the technical field of oil product pipelines, and is used for solving the problem that the working oil pumping efficiency of an oil pumping unit is poor when the internal pressure of a blocked section pipeline is smaller than the external pressure. The oil discharge system comprises an oil pumping mechanism and an air pressure balancing device. And the oil pumping mechanism is arranged at the oil discharge end of the oil product pipeline. The air pressure balancing device is installed at the two-inch balancing hole of the oil product pipeline, and external air can enter the oil product pipeline. The oil discharge system is used for oil discharge of a plugging section of an oil product pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil pipeline, and in particular to an oil draining system. BACKGROUND

[0002] The oil pipeline refers to a pipeline for transporting refined oil and crude oil, which plays an important role in energy transportation.

[0003] When the oil pipeline has welding openings and other quality defects or needs to be changed, plugging work needs to be performed to replace the new pipeline or connect the new pipeline with the old pipeline. After the plugging work of the oil pipeline is completed, the oil in the internal pipeline of the plugging section needs to be drained to reach the fire operation condition, and an oil pumping machine is usually used to pump out the oil in the internal pipeline of the plugging section.

[0004] However, the oil pumping machine relies on air pressure to pump out the oil in the internal pipeline of the plugging section, and when the internal pressure of the plugging section pipeline is less than the external pressure, the oil pumping efficiency of the oil pumping machine is poor, prolonging the operation time of the plugging section pipeline. CONTENT OF THE INVENTION

[0005] The present application provides an oil draining system to solve the problem of poor oil pumping efficiency of the oil pumping machine when the internal pressure of the plugging section pipeline is less than the external pressure.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The present application provides an oil draining system, which comprises an oil pumping mechanism and an air pressure balancing device. The oil pumping mechanism is arranged at the oil draining end of the oil pipeline. The air pressure balancing device is installed at the two-inch balancing hole of the oil pipeline, and can allow external gas to enter the internal pipeline.

[0008] According to the above technical means, the oil draining system provided by the present application is arranged at the oil draining end of the oil pipeline, and the oil pipeline provides a mounting position for the oil pumping mechanism. The air pressure balancing device is installed at the two-inch balancing hole of the oil pipeline, and the oil pipeline provides a mounting position for the air pressure balancing device. The air pressure balancing device can allow external gas to be sucked into the internal pipeline. When the oil pipeline in the plugging section needs to be drained, the oil pumping mechanism is installed at the oil draining end of the oil pipeline, and the oil in the internal pipeline can be pumped out. When the internal pressure of the oil pipeline is less than the external pressure, the external gas can enter the internal pipeline through the pressure balancing device to avoid the formation of negative pressure in the internal pipeline.

[0009] In some embodiments, the air pressure balancing device comprises a balancing body and a one-way valve. The internal pipeline of the balancing body forms a flow channel, and a first opening and a second opening are arranged in the flow channel. The first opening is used to communicate with the opening of the oil pipeline. The one-way valve is arranged at the second opening and is used to allow external gas to flow into the flow channel.

[0010] According to the above technical means, when the internal pressure of the oil pipeline is greater than the external pressure, the one-way valve can prevent the oil from leaking out of the gas pressure balancing device; when the internal pressure of the oil pipeline is less than the external pressure, the one-way valve can ensure that the external gas enters the internal part of the oil pipeline, balance the internal and external pressures of the oil pipeline, and improve the oil discharge efficiency of the oil discharge mechanism.

[0011] In some embodiments, the balancing body further has a third opening and a fourth opening communicated with the flow channel. The gas pressure balancing device further comprises a first pressure valve and a second pressure valve. The first pressure valve is arranged at the third opening and is used for detecting the positive pressure value of the internal part of the oil pipeline relative to the external part and discharging the pressure in the gas pressure balancing device. The second pressure valve is arranged at the fourth opening and is used for detecting the negative pressure value of the internal part of the oil pipeline relative to the external part.

[0012] According to the above technical means, the first pressure valve can detect the positive pressure value of the internal part of the oil pipeline relative to the external part, and the pressure value of the internal part of the oil pipeline can be confirmed by observing the first pressure valve when the internal pressure of the oil pipeline is greater than the external pressure. The second pressure valve can detect the negative pressure value of the internal part of the oil pipeline relative to the external part, and the one-way valve can be opened in time to allow the gas to enter when the internal pressure of the oil pipeline is less than the external pressure by observing the second pressure valve.

[0013] In some embodiments, the balancing body is a four-way valve.

[0014] According to the above technical means, the four-way valve has excellent sealing performance, long service life, small size, light weight, simple structure, and convenient maintenance, and is suitable for the environment of oil pipeline plugging operation.

[0015] In some embodiments, the oil discharge mechanism comprises a connecting flange and an oil pumping device. The connecting flange is installed at the oil discharge end of the oil pipeline, and the connecting flange has a connecting hole. The oil pumping device is arranged at the connecting hole and is used for pumping the oil in the oil pipeline.

[0016] According to the above technical means, the oil pumping device is connected to the oil discharge end of the oil pipeline through the connecting flange. The flange has strong sealing performance, a wide pressure bearing range, good stability, convenient maintenance, and is convenient to install and disassemble, and is suitable for the environment of oil pipeline plugging operation.

[0017] In some embodiments, the connecting hole comprises a first connecting hole. The oil pumping device comprises an oil pumping machine, and the oil pumping machine is arranged at the first connecting hole.

[0018] According to the above technical means, the oil pumping machine is installed at the first connecting hole, and the connecting flange provides an installation position for the oil pumping machine. The oil pumping machine enters the internal part of the oil pipeline through the first connecting hole and can pump the oil in the internal part of the oil pipeline.

[0019] In some embodiments, the pumping unit comprises a body, a telescopic pipe and a feeding pipe. The body is arranged at the first connecting hole. The telescopic pipe is a hollow mechanism and can be extended into the oil product pipeline through the first connecting hole. The feeding pipe can control the telescopic pipe to extend or retract.

[0020] According to the above technical means, the length of the telescopic pipe extending into the oil product pipeline can be controlled through the feeding pipe. When the oil level inside the oil product pipeline decreases, the telescopic pipe can be adjusted in time to ensure that the pumping unit can directly contact the oil product, thereby improving the working efficiency of the pumping unit.

[0021] In some embodiments, the connecting hole further comprises a second connecting hole. The pumping unit further comprises a draining pipe, one end of the draining pipe being connected to the second connecting hole.

[0022] According to the above technical means, the connecting flange can connect the pumping unit and the draining pipe, and the oil product in the oil product pipeline can be drained through the pumping unit and the draining pipe. When the pressure in the oil product pipeline is relatively high, the oil can be drained through the draining pipe by using the pressure in the pipeline. When the pressure in the oil product pipeline is close to the external pressure, the draining effect of the draining pipe is not good, and the pumping unit can be used to drain the oil.

[0023] In some embodiments, the connecting flange further comprises a third connecting hole. The third connecting hole is connected to an inflation pipe of a separation air bag used for plugging in the oil product pipeline.

[0024] According to the above technical means, when the plugging effect of the oil product pipeline is not ideal, the leakage amount at the plugging position per unit time is large, and the oil accumulated in the separation air bag needs to be pumped out in time to avoid that the separation air bag is displaced due to too much oil accumulated in the separation air bag, thereby causing the plugging effect to be not ideal. The third connecting hole provided on the connecting flange can make the separation air bag pressure stabilization and pipeline oil draining be performed at the same time in a closed state of the oil product pipeline.

[0025] In some embodiments, the oil draining system further comprises a sewage pressure relief valve. The sewage pressure relief valve is in communication with the pumping mechanism and the air pressure balancing device, and can drain the oil in the pumping mechanism and the air pressure balancing device.

[0026] According to the above technical means, the sewage pressure relief valve can effectively prevent the equipment from being damaged due to overpressure, and ensure the safety and stability of the production process. At the same time, after the oil draining system completes the oil pumping work inside the oil product pipeline, the sewage pressure relief valve can be used to remove the residual oil in the pumping mechanism and the air pressure balancing device, thereby avoiding that the residual oil in the pumping mechanism and the air pressure balancing device leaks to the outside and pollutes the environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of an oil draining system according to an embodiment of the present application;

[0028] Figure 2 A structure schematic diagram of a connecting flange provided by an embodiment of the present application;

[0029] Figure 3 A structure schematic diagram of a connecting flange provided by an embodiment of the present application;

[0030] Figure 4 A structure schematic diagram of a balancing device provided by an embodiment of the present application;

[0031] Figure 5 A structure schematic diagram of a pumping unit provided by an embodiment of the present application.

[0032] Reference signs:

[0033] 100 - oil discharge system; 1 - pumping unit; 11 - connecting flange; 12 - connecting hole; 121 - first connecting hole; 122 - second connecting hole; 13 - pumping device; 131 - pumping unit; 1311 - feeding pipe; 1312 - telescopic pipe; 1313 - body; 1314 - seventh connecting hole; 132 - oil discharge pipe; 14 - third connecting hole; 16 - fourth connecting hole; 17 - fifth connecting hole; 18 - protruding part; 19 - connecting part; 191 - first connecting part; 192 - second connecting part; 110 - sixth connecting hole; 2 - pneumatic balancing device; 21 - balancing main body; 22 - flow-through passage; 23 - first opening; 24 - second opening; 25 - one-way valve; 26 - third opening; 27 - fourth opening; 28 - first pressure valve; 29 - second pressure valve; 210 - shut-off valve; 3 - pressure relief and blowdown valve; 200 - oil pipeline; 201 - two-inch balancing hole; 202 - isolation air bag. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", "center" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] The terms "first", "second", etc. are used only for the purpose of description and do not connote or imply any relative importance or imply an ordering of the elements. Thus, features with "first", "second" designations can be present in either an explicit or an implicit manner.

[0037] In the description of the present application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this document is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist together, and B exists alone. In addition, "at least one" means one or more, and "multiple" means two or more.

[0038] In the embodiments of the present application, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0039] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0040] The embodiments of the present application provide an oil drainage system, such as Figure 1 as shown, Figure 1 A structural schematic diagram of an oil drainage system 100 provided by the embodiments of the present application is shown, which includes an oil pumping mechanism 1 and a gas pressure balancing device 2. The oil pumping mechanism 1 is arranged at the oil drainage end of an oil pipeline 200. The gas pressure balancing device 2 is installed at a two-inch balancing hole 201 of the oil pipeline 200, which can make external gas enter the inside of the oil pipeline 200.

[0041] Based on the above technical means, this embodiment provides an oil drainage system 100. An oil extraction mechanism 1 is installed at the oil drainage end of an oil pipeline 200, with the oil pipeline 200 providing the installation position for the oil extraction mechanism 1. A pressure balancing device 2 is installed at a two-inch balance hole 201 in the oil pipeline 200, with the oil pipeline 200 providing the installation position for the pressure balancing device 2. The pressure balancing device 2 allows external gas to be drawn into the interior of the oil pipeline 200. When oil drainage is required in the blocked section of the oil pipeline 200, the oil extraction mechanism 1 is installed at the oil drainage end of the oil pipeline 200 to extract the oil from inside the oil pipeline 200. When the pressure inside the oil pipeline 200 is lower than the external pressure, the pressure balancing device 2 allows external gas to enter the interior of the oil pipeline 200, preventing negative pressure from forming inside the oil pipeline 200.

[0042] In some embodiments, such as Figure 4 As shown, the pressure balancing device 2 includes a balancing body 21 and a one-way valve 25. The interior of the balancing body 21 forms a flow channel 22, and has a first opening 23 and a second opening 24 communicating with the flow channel 22. The first opening 23 is used to connect with the oil pipeline 200 (…). Figure 1 The opening is connected to the passageway 22. A one-way valve 25 is located at the second opening 24 to allow external gas to flow into the passageway 22.

[0043] Based on the above technical means, when the internal pressure of the oil pipeline 200 is greater than the external pressure, the one-way valve 25 can prevent oil from leaking from the pressure balancing device 2 to the outside; when the internal pressure of the oil pipeline 200 is less than the external pressure, the one-way valve 25 can ensure that external gas enters the oil pipeline 200 through the one-way valve 25, balance the internal and external pressures of the oil pipeline 200, and improve the oil discharge efficiency of the pumping mechanism 1.

[0044] Of course, the pressure balancing device 2 may not include the balancing body 21. The one-way valve 25 is directly installed at the first opening 23, which allows external gas to flow into the oil pipeline 200.

[0045] For example, the one-way valve 25 includes a hydraulically controlled one-way valve, a check valve, a swing check valve, a lift check valve, etc. The main function of the one-way valve 25 is to limit oil leakage inside the oil pipeline 200, and at the same time, when the pressure inside the oil pipeline 200 is lower than the external pressure, it allows external gas to enter the oil pipeline 200 through the one-way valve 25.

[0046] In some embodiments, such as Figure 4 As shown, the balancing body 21 also has a third opening 26 and a fourth opening 27 communicating with the flow channel 22. The pressure balancing device 2 also includes a first pressure valve 28 and a second pressure valve 29. The first pressure valve 28 is located at the third opening 26 and is used to detect the oil pipeline 200 ( Figure 1) and pressure relief in the pressure equalization device 2. The second pressure valve 29 is arranged at the fourth opening 27 for detecting the positive pressure value of the oil product pipeline 200 relative to the outside.

[0047] According to the above technical means, the first pressure valve 28 can detect the positive pressure value of the oil product pipeline 200 relative to the outside, and when the air pressure inside the oil product pipeline 200 is greater than the external pressure, the observation of the first pressure valve 28 can confirm the pressure value inside the oil product pipeline 200. The second pressure valve 29 can detect the negative pressure value of the oil product pipeline 200 relative to the outside, and by observing the second pressure valve 29, when the internal pressure of the oil product pipeline 200 is less than the external pressure, the one-way valve 25 can be opened in time.

[0048] For example, the detection range of the second pressure valve 29 can be set to -0.1-0.5MPa.

[0049] For example, a cut-off valve 210 is further arranged between the first pressure valve 28 and the second pressure valve 29 and the balance body 21, which can cut off the communication of the first pressure valve 28 and the second pressure valve 29 and the flow passage 22, and facilitate maintenance and replacement when the first pressure valve 28 and the second pressure valve 29 are damaged.

[0050] In some embodiments, the balance body 21 is a four-way valve.

[0051] According to the above technical means, the four-way valve has excellent sealing performance, long service life, small size, light weight, simple structure, and convenient maintenance, and is suitable for the environment of oil product pipeline 200 plugging operation.

[0052] For example, the four-way valve can be a pressure balance four-way, which is a special pipe connecting device, usually used in occasions that need to absorb the displacement and pressure thrust generated in the pipeline system. The pressure balance four-way realizes pressure balance by designing a special corrugated pipe structure, thereby reducing the requirement for fixed supports and improving the safety and reliability of the system.

[0053] In some embodiments, as shown in Figure 1 The oil pumping mechanism 1 includes a connecting flange 11 and an oil pumping device 13. The connecting flange 11 is installed at the oil discharging end of the oil product pipeline 200, and a connecting hole 12 is formed on the connecting flange 11. Figure 2 The oil pumping device 13 is arranged at the connecting hole 12 for pumping oil in the oil product pipeline 200.

[0054] According to the above technical means, the oil pumping mechanism 1 is connected to the oil discharging end of the oil product pipeline 200 through the connecting flange 11. The flange has strong sealing performance, wide pressure bearing range, good stability, convenient maintenance, and is easy to install and disassemble, and is suitable for the environment of oil product pipeline 200 plugging operation.

[0055] Exemplarily, the oil discharge end of the oil product pipeline 200 is a clamp valve on the oil product pipeline 200. When the oil product pipeline 200 needs to be blocked for replacement of a new pipeline section or connection of a new pipeline with an old pipeline, pipeline opening needs to be performed first. The clamp valve installed during the pipeline opening is connected with the inside of the oil product pipeline 200, and the pipeline can be discharged through the clamp valve after the opening is completed.

[0056] Exemplarily, the connecting flange 11 can be connected with the oil discharge end of the oil product pipeline 200 through bolts, and a plurality of sixth connecting holes 110 are formed on the connecting flange 11. The bolt connection structure is simple, reliable, fast in construction, and convenient to assemble and disassemble. It can be understood that, in order to ensure the sealing of the connection between the connecting flange 11 and the oil discharge end of the oil product pipeline 200, a metal graphite winding gasket is arranged at the connection between the connecting flange 11 and the oil discharge end of the oil product pipeline 200. The metal graphite winding gasket is resistant to high temperature and high pressure, corrosion resistant, has excellent sealing performance, good resilience, wide application range, and is easy to install, and can achieve good sealing effect without high fastening force.

[0057] Exemplarily, in order to facilitate the installation and transportation of the connecting flange 11, as shown in Figure 2 , a plurality of fourth connecting holes 16 are formed on the connecting flange 11. The fourth connecting holes 16 can be used for hoisting the connecting flange 11.

[0058] Exemplarily, in order to ensure the sealing of the connecting flange 11 and the oil product pipeline 200, as shown in Figure 3 , the connecting flange 11 is further provided with a protruding portion 18, and the protruding portion 18 faces the oil product pipeline 200. It can be understood that the size of the protruding portion 18 is determined according to the size of the oil discharge end of the oil product pipeline 200.

[0059] Exemplarily, the height of the protruding portion 18 is 3 mm.

[0060] In some embodiments, as shown in Figure 1 and Figure 2 , the connecting hole 12 includes a first connecting hole 121. The oil pumping device 13 includes an oil pumping machine 131, and the oil pumping machine 131 is arranged at the first connecting hole 121.

[0061] According to the above technical means, the oil pumping machine 131 is installed at the first connecting hole 121, and the connecting flange 11 provides a mounting position for the oil pumping machine 131. The oil pumping machine 131 enters the inside of the oil product pipeline through the first connecting hole 121, and can pump the oil in the inside of the oil product pipeline 200.

[0062] It can be understood that a high-pressure valve should be arranged at the first connecting hole 121, which is used to isolate the oil in the inside of the oil product pipeline 200 from the outside, so as to facilitate the installation and replacement of the oil pumping machine 131 and other operations.

[0063] Exemplarily, the first connecting hole 121 is also provided with a quick connection mechanism for quick connection with the oil pumping machine 131 to accelerate the oil discharging speed during the plugging operation of the oil product pipeline 200. The quick connection mechanism includes threaded connection, clamping, screw thread short circuit and other quick connection modes.

[0064] Exemplarily, the diameter of the first connecting hole 121 can be 3 inches, and the oil pumping machine 131 performs oil pumping operation through the 3-inch first connecting hole 121. By setting the 3-inch first connecting hole 121 for oil pumping, compared with oil pumping through the existing two-inch balance hole 201 on the oil product pipeline 200, the speed of the oil pumping machine 131 for pumping oil can be greatly improved.

[0065] In some embodiments, as shown in Figure 5 The oil pumping machine 131 includes a feeding pipe 1311, a telescopic pipe 1312 and a machine body 1313. The machine body 1313 is arranged at the first connecting hole 121 Figure 2 The telescopic pipe 1312 is a hollow mechanism and can be at least partially inserted into the oil product pipeline 200 Figure 1 The feeding pipe 1311 can control the telescopic pipe 1312 to extend and retract.

[0066] According to the above technical means, the length of the telescopic pipe 1312 inserted into the oil product pipeline 200 can be controlled through the feeding pipe 1311. When the oil level inside the oil product pipeline 200 decreases, the telescopic pipe 1312 can be adjusted in time to ensure that the oil pumping machine 131 can directly contact the oil, thereby improving the working efficiency of the oil pumping machine 131.

[0067] It can be understood that the functions of the telescopic pipe 1312 and the feeding pipe 1311 are to adjust the telescopic pipe 1312 to make the oil pumping machine 131 directly contact the oil when the oil level inside the oil product pipeline 200 decreases. The structure of the telescopic pipe 1312 and the feeding pipe 1311 can be replaced by structures such as sliding chute, connecting rod and telescopic arm which can achieve the same effect.

[0068] Exemplarily, the top of the feeding pipe 1311 is also provided with a seventh connecting hole 1314, and the seventh connecting hole 1314 can be connected with an oil discharging pipe 132 to guide the oil pumped out by the oil pumping machine 131 into a storage container.

[0069] Exemplarily, the machine body 1313 is also provided with a mounting port, and a pressure gauge can be connected to the oil pumping machine 131 through the mounting port. By setting the pressure gauge, the pressure in the pipeline can be detected, and the pressure of the plugging section pipeline can be observed in cooperation with the first pressure valve 28 and the second pressure valve 29.

[0070] In some embodiments, as shown in Figure 1 and Figure 2As shown, the connecting hole 12 further comprises a second connecting hole 122. The oil pumping device 13 further comprises an oil discharging pipe 132, one end of which is connected to the second connecting hole 122.

[0071] According to the above technical means, the connecting flange 11 can connect the oil pumping device 131 and the oil discharging pipe 132, and the oil in the oil product pipeline 200 can be discharged through the oil pumping device 131 and the oil discharging pipe 132. When the pressure in the oil product pipeline 200 is too large, the residual pressure in the pipeline can be used to directly discharge the oil through the oil discharging pipe 132. When the pressure in the oil product pipeline 200 is close to the external pressure, the oil discharging effect of the oil discharging pipe 132 is not good, and at this time the oil pumping device 131 can be used for oil discharging.

[0072] It can be understood that a high-pressure valve should be provided at the second connecting hole 122, which is used to isolate the oil in the oil product pipeline 200 from the outside, facilitating the installation, replacement and other operations of the oil discharging pipe 132.

[0073] Exemplarily, the second connecting hole 122 is also provided with a quick connecting mechanism for quick connection with the oil discharging pipe 132, so as to speed up the oil discharging speed of the oil product pipeline 200 plugging operation. The quick connecting mechanism includes threaded connection, clamping, screw short circuit and other quick connection modes.

[0074] Exemplarily, the oil discharging pipe 132 comprises an oil discharging soft pipe and an oil discharging hard pipe. When the oil discharging pipe 132 is used for oil discharging, the oil discharging soft pipe should be preferred, and under the same conditions, the flow resistance generated by the oil discharging soft pipe is smaller than that generated by the oil discharging hard pipe, and the flow speed of the oil in the oil discharging soft pipe is higher than that in the oil discharging hard pipe, so that the oil discharging speed can be improved. It can be understood that the oil discharging soft pipe needs to have the characteristics of oil resistance, pressure resistance and corrosion resistance, and materials such as rubber hose, PVC hose and polyurethane hose can be selected. It can be understood that the oil discharging pipe 132 connected to the oil pumping device body 1313 preferably selects the oil discharging soft pipe.

[0075] Of course, when the pressure in the oil product pipeline 200 is too large and the oil discharging soft pipe cannot meet the safety pressure requirement of the oil discharging operation, in order to ensure that the oil will not burst through the oil discharging pipe 132, the oil discharging pipe 132 can select the oil discharging hard pipe. The oil discharging hard pipe can be made of metal material, such as galvanized steel pipe. The galvanized steel pipe has good corrosion resistance and can resist the corrosion of oil, and at the same time, the strength and rigidity are sufficient to withstand oil pressure and mechanical stress. Of course, the oil discharging hard pipe can also use stainless steel pipe, copper pipe, titanium alloy pipe, aluminum alloy pipe and other materials.

[0076] Exemplarily, the diameter of the second connecting hole 122 is 2 inches. The size of the commonly used oil discharging pipe 132 in pipeline plugging operation is at most 2 inches, and the second connecting hole 122 with a diameter of 2 inches can maximize the guarantee of the oil discharging speed, and at the same time, the existing oil discharging pipe 132 can be directly used.

[0077] As shown in Figure 3 The first connecting hole 121 and the second connecting hole 122 are further provided with a connecting part 19. The first connecting part 191 is arranged on the first connecting hole, and the second connecting part 192 is arranged on the second connecting hole. Through the connecting part 19, the installation of the oil pumping device 13 is facilitated.

[0078] In some embodiments, as shown in Figure 1 and Figure 2 The connecting flange 11 is further provided with a third connecting hole 14. The third connecting hole 14 is connected with the inflation pipe of the isolation air bag 202 used for plugging in the oil product pipeline 200.

[0079] According to the above technical means, when the plugging effect of the oil product pipeline 200 is not ideal, the leakage amount at the plugging position per unit time is large, and the oil accumulated at the isolation air bag 202 needs to be pumped out at regular intervals to avoid excessive accumulation of oil at the isolation air bag 202, which causes displacement of the isolation air bag 202 and leads to an unsatisfactory plugging effect. By arranging the third connecting hole 14 on the connecting flange 11, the stable pressure of the isolation air bag 202 and the oil pipeline can be simultaneously performed in a closed state.

[0080] It can be understood that a high-pressure valve should be arranged at the third connecting hole 14, which is used to isolate the oil in the oil product pipeline 200 from the outside, and facilitates the installation, replacement and other operations of the oil pumping device.

[0081] Exemplarily, the third connecting hole 14 is further provided with a quick connecting mechanism for quick connection with the inflation pipe of the isolation air bag 202, which can speed up the construction speed of the oil product pipeline 200 plugging operation. The quick connecting mechanism includes threaded connection, clamping, screw thread short circuit and other quick connection modes.

[0082] Exemplarily, as shown in Figure 1 and Figure 2 The connecting flange 11 is further provided with a fifth connecting hole 17, and the fifth connecting hole 17 is used for installing a liquid level meter. Through the liquid level meter, the height of the oil in the oil product pipeline 200 can be observed without opening the clamp valve for confirmation.

[0083] In some embodiments, as shown in Figure 4 and Figure 5 The oil discharging system 100 further comprises a blowdown pressure relief valve 3. The blowdown pressure relief valve 3 is in communication with the oil pumping mechanism 1 and the air pressure balancing device 2, respectively, and can discharge the oil in the oil pumping mechanism 1 and the air pressure balancing device 2.

[0084] According to the above technical means, the blow-off pressure relief valve 3 is arranged, which can effectively prevent the equipment from being damaged due to overpressure, and ensure the safety and stability of the production process. At the same time, after the oil pipeline 200 inside the oil discharge system is completed, the oil remaining in the oil pumping mechanism 1 and the air pressure balancing device 2 can be removed through the blow-off pressure relief valve 3, so as to avoid the oil remaining in the oil pumping mechanism 1 and the air pressure balancing device 2 from leaking to the outside and polluting the environment.

[0085] Of course, the blow-off pressure relief valve 3 can have two sets, which are respectively communicated with the oil pumping mechanism 1 and the air pressure balancing device 2.

[0086] For example, the blow-off pressure relief valve 3 includes a spring relief valve, a pilot relief valve, a lever relief valve, etc.

[0087] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil draining system for draining oil during a plugging operation of an oil product pipeline, characterized in that The application relates to an oil pumping mechanism and a gas pressure balancing device. The oil pumping mechanism is arranged at the oil discharging end of the oil pipeline. The gas pressure balancing device is arranged at the balance hole of the oil pipeline and can make external gas enter the internal part of the oil pipeline. The gas pressure balancing device comprises a balance main body, a first opening and a second opening arranged on the balance main body, a one-way valve arranged at the second opening and used for making external gas flow into the flow channel.

2. The oil drainage system of claim 1, wherein, The balance main body further comprises a third opening and a fourth opening arranged on the balance main body. The gas pressure balancing device further comprises a first pressure valve arranged at the third opening and used for detecting the positive pressure value of the internal part of the oil pipeline relative to the external part and discharging the pressure in the gas pressure balancing device. The gas pressure balancing device further comprises a second pressure valve arranged at the fourth opening and used for detecting the negative pressure value of the internal part of the oil pipeline relative to the external part.

3. The oil drainage system of claim 2, wherein, The balance main body is a four-way valve. The oil pumping mechanism comprises a connecting flange arranged at the oil discharging end of the oil pipeline, a connecting hole arranged on the connecting flange and an oil pumping device arranged at the connecting hole and used for pumping oil in the oil pipeline. The connecting hole comprises a first connecting hole.

4. The oil drainage system of claim 2, wherein, The oil pumping device comprises an oil pumping machine arranged at the first connecting hole.

5. The oil drainage system of claim 1, wherein, The oil pumping machine comprises a machine body arranged at the first connecting hole, a telescopic pipe which is a hollow mechanism and can at least partially extend into the oil pipeline through the first connecting hole and a feeding pipe used for controlling the telescopic pipe. The connecting hole further comprises a second connecting hole. The oil pumping device further comprises an oil discharging pipe connected to the second connecting hole.

6. The oil drainage system of claim 5, wherein, The connecting flange further comprises a third connecting hole. The third connecting hole is connected to the inflation pipe of the isolation air bag used for plugging in the oil pipeline.

7. The oil drainage system of claim 6, wherein, The oil discharging system further comprises a sewage pressure relief valve communicated with the oil pumping mechanism and the gas pressure balancing device and used for discharging oil in the oil pumping mechanism and the gas pressure balancing device. ​ ​ ​ 8. The oil drainage system of claim 6, wherein, ​ ​ 9. The oil drainage system of claim 8, wherein, ​ 10. The oil drainage system of claim 1, wherein, ​ ​

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