Dissolved gas extraction device for oil and gas gathering and transportation pipeline

Abstract

The utility model relates to a dissolved gas extraction device for an oil and gas gathering and transportation pipeline. A gas taking bin in the device is connected with a gas storage bin connected with a sampling joint through a stop valve; the two ends of the gas storage bin short section are connected with the gas storage bin lower connector and a gas storage bin shell connected with the gas storage bin upper connector respectively. A piston in the gas taking bin is mounted in a transparent lining pipe II sealed by a lower sealing joint and an upper sealing joint and is connected with a lead screw in a gland through threads; the two ends of a gas taking bin shell provided with a second transparent lining pipe are connected with an oil storage short section and a gland respectively, and a pressure gauge and an exhaust valve are both installed in the oil storage short section provided with an oil storage cavity and a gas channel. Observation windows are arranged in the gas storage bin shell and the gas taking bin shell. The device can effectively improve the operation safety of gas content detection on an oil field production site and the accuracy of detection data, so that the normal operation of gathering and transportation equipment is ensured. And pollution accidents are reduced, the environment is protected, the scale harm to operators is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a tool for extracting dissolved gas in oil wells and gathering and transportation pipelines in the petroleum industry, in particular to a device for extracting dissolved gas in oil and gas gathering and transportation pipelines. Background Art

[0002] In the petroleum industry, the produced fluid from oil wells is prone to produce harmful gases during the closed transportation process, such as hydrogen sulfide gas, which is potentially harmful to the human body and the environment. The concentration of hydrogen sulfide in the produced fluid from oil wells and the transport medium in the gathering and transportation pipelines needs to be tested at any time. On the one hand, preventive and emergency measures can be taken in time to protect personnel and the environment from its harm; on the other hand, through detection, the changes in toxic gases in the fluid transportation process can be understood in real time, and then the transportation process parameters can be adjusted to improve production efficiency; furthermore, the failure of the transportation equipment or the problems in the transportation process can be discovered in time to avoid problems with the quality of the transported products, and improve the production quality of the produced fluid from oil wells and the reliability of crude oil transportation. Therefore, toxic gas detection is a key monitoring measure that is related to the safety of oil production sites and transportation pipelines, and can effectively respond to potential explosion and poisoning risks.

[0003] For safety, workers must wear appropriate protective equipment during the extraction and testing of oil well production fluids and the transport medium in the gathering and transportation pipelines. Personal safety is of vital importance during the entire gas sampling process, and for protection, it includes but is not limited to anti-slip gloves, anti-splash goggles, etc. These protective equipment can effectively reduce health risks caused by accidental injuries and ensure safety during the operation.

[0004] At present, the gas sampling device used is a syringe-shaped semi-open type. The colorimetric tube is installed at the gas sampling port of the sampling pump in the gas sampling device, and the colorimetric tube is inserted into the gas sampling port. The gas sampling port valve is slightly opened to perform gas sampling. This sampling method is bound to cause the dissolved gas in the produced liquid to be discharged into the atmosphere. If the measured gas contains harmful gases such as hydrogen sulfide and carbon monoxide, it will inevitably cause harm to the operator. Therefore, how to achieve full sealing and low error in the extraction process of the dissolved gas in the produced liquid has become the primary problem to be solved.

[0005] After searching, there are several related patent technologies: Authorization announcement number: CN211851833U discloses a hydrogen sulfide sealed sampler for oil wells. The utility model includes a buffer bottle and a gas collection bag. The inlet end of the buffer bottle is connected to the oil well sampling port, and the outlet end of the buffer bottle is connected to the gas collection bag through a rubber tube. The beneficial effect of the utility model is that by setting the buffer bottle to be connected to the oil well sampling port, it is possible to avoid direct discharge of natural gas into the atmosphere and the harm to the operator, ensuring that the operator can scientifically and reasonably perform hydrogen sulfide sampling under safe conditions, meeting the user's use needs.

[0006] However, the above device still has the following defects: the sampling method is single, the detection error of the gas is large, the sampler is mostly made of non-metallic materials, and because it is connected by plug-in, the pressure resistance is low and there is a risk of rupture. When the gas pressure in the produced fluid is high, the sealing of the sampler cannot be guaranteed, and the application range is narrow and can only be used in oil wells.

[0007] Authorization announcement number: CN208459098U discloses a hydrogen sulfide sampling tester, the utility model includes an L-type three-way valve, a handle is provided on the top of the L-type three-way valve, a quick self-closing female joint is provided on one side of the L-type three-way valve, a test port is provided on the other side of the L-type three-way valve, a metal outer tube is provided at the bottom of the L-type three-way valve, a pressure gauge channel is provided in the L-type three-way valve, a positive and negative pressure gauge is provided on the pressure gauge channel, and the positive and negative pressure gauges are located on the outside of the L-type three-way valve, a glass inner tube is provided in the metal outer tube, a sealing gasket is fixedly installed on the inner wall of the top of the metal outer tube, a piston is slidably installed in the glass inner tube, a connecting rod is fixedly installed at the bottom of the piston, and the bottom end of the connecting rod extends to the bottom of the metal outer tube and is fixedly installed with a handle, and a plurality of O-rings are wound around the outside of the piston. The utility model can avoid leakage during the detection process, not waste a little bit of the detected gas, and ensure the safety of the detection personnel and the health of the environment.

[0008] However, the following defects still exist: since the connecting rod used is a push-pull type for gas collection and exhaust, there is a risk of ejection when the pressure is too high, and the quick self-closing female joint does not adopt effective measures to prevent the entry of fluid media, thus affecting its detection effect.

[0009] In summary, although there are many types of manual gas extraction devices currently available, they generally have problems such as high manufacturing costs, complex structures, and proneness to failure. They cannot achieve full sealing and low-error inspection during the gas extraction process, and there is still room for improvement in how to isolate gas and liquid when the gas being detected contains fluid media. Summary of the invention

[0010] The purpose of the utility model is to provide a dissolved gas extraction device for oil and gas gathering and transportation pipelines, improve the defects in the structure of existing manual gas extraction devices, and facilitate the extraction of dissolved gas in the oil field transportation fluid medium. The dissolved gas extraction device can extract gas accurately and perform sealed sampling throughout the entire process. The operational safety of gas content extraction at the oil field production site and the accuracy of detection data can be improved to ensure the normal operation of oil and gas gathering and transportation equipment. The occurrence of pollution accidents can be reduced, and the environment and production equipment can be protected. The harm of dissolved gas in oil well production fluid and dissolved gas in the transportation medium in the gathering and transportation pipeline to operators can be reduced, and work efficiency can be improved.

[0011] To achieve the above-mentioned purpose, the technical solution of the utility model is: a dissolved gas extraction device for oil and gas gathering and transportation pipelines, including a gas extraction bin, in which a piston, a pressure gauge and a transparent inner liner tube 2 are provided, wherein: the gas extraction bin is connected to a gas storage bin connected to a sampling joint via a stop valve; a transparent inner liner tube 1 and a gas storage bin shell are provided in the gas storage bin, and the transparent inner liner tube 1 is installed in the gas storage bin shell; the two ends of the gas storage bin short section are respectively connected to the gas storage bin lower joint and the gas storage bin shell connected to the gas storage bin upper joint; the piston in the gas extraction bin is installed in the transparent inner liner tube 2 sealed by the lower sealing joint and the upper sealing joint and is connected to the lead screw connected to the pressure cover by threads; the two ends of the gas extraction bin shell equipped with the transparent inner liner tube 2 are respectively connected to the oil storage short section and the pressure cover, and the pressure gauge and the exhaust valve are both installed in the oil storage short section provided with an oil storage cavity and a gas channel; observation windows are provided in the gas storage bin shell and the gas extraction bin shell.

[0012] Preferably, both ends of the sealed transparent inner liner tube 1 are sealed by seal 2 and seal 1; seal 1 and seal 2 are both provided with center holes and the outer circles are both stepped outer circles, the large diameter outer circles of seal 1 and seal 2 are consistent with the outer circle of transparent inner liner tube 1 and the small diameter outer circles are equal to or smaller than the inner circle of transparent inner liner tube 1; the small diameter outer circles of seal 1 and seal 2 are installed facing each other at both ends of transparent inner liner tube 1; seal 1 and seal 2 are made of plastic material.

[0013] Preferably, both ends of the outer circle of the air storage bin short section are provided with external threads and can be threadedly connected to the air storage bin lower joint and the air storage bin outer shell respectively; the inner cavity of the air storage bin short section is a non-equal diameter inner cavity, and the middle of the inner cavity of the air storage bin short section is a partition with a flow hole, and the inner diameter of the left side of the partition adjacent to the air storage bin lower joint is larger than the inner diameter of the right side of the partition adjacent to the seal 2, forming an oil storage cavity.

[0014] Preferably, the lower joint of the gas storage bin is a non-equal diameter cylindrical assembly with a center hole and the inner circles at both ends are provided with internal threads, which can be threadedly connected to the sampling joint and the gas storage bin short section respectively; the body of the sampling joint with a center hole is provided with external threads at both ends and can be threadedly connected to the lower joint of the gas storage bin and the sampling valve in the detected pipeline respectively; the outer wall of the middle part of the body of the sampling joint is provided with a wrench square; the two ends of the upper joint of the gas storage bin are provided with internal threads and external threads respectively and can be threadedly connected to the gas storage bin shell and the stop valve respectively.

[0015] Preferably, the gas passage in the inner cavity of the oil storage pup joint is a cross-shaped hole, and the upper hole and the lower hole in the cross-shaped hole are both stepped holes with internal threads, which are respectively connected to the pressure gauge joint and the exhaust valve joint through the threaded holes in the stepped holes and are respectively connected to the pressure gauge and the exhaust valve through the pressure gauge joint and the exhaust valve joint; the left inlet inner cavity of the oil storage pup joint is threadedly connected to the lower joint of the air intake bin and the right outlet outer circle is threadedly connected to the outer shell of the air intake bin; the left inlet inner cavity of the oil storage pup joint is larger than the inner cavity of the right outlet, and an oil storage cavity is formed between the left inlet inner cavity and the lower joint of the air intake bin; wrench squares are provided on both sides of the oil storage pup joint where the pressure gauge and the exhaust valve are not installed.

[0016] Preferably, the lower sealing joint and the upper sealing joint are both made of plastic material and are respectively installed at the two ends of the transparent inner liner tube 2; the outer circle of the lower sealing joint is a stepped outer circle with a sealing ring, and the stepped outer circle is respectively installed in the oil storage short section and the transparent inner liner tube 2 and has an interference fit with the oil storage short section and the transparent inner liner tube 2.

[0017] Preferably, the piston is a cylinder whose outer circle is smaller than the inner circle of the second transparent inner liner tube, and the upper outer circle of the piston is equipped with a sealing ring and forms an interference fit with the second transparent inner liner tube.

[0018] Preferably, a gas extraction scale is provided on the transparent inner lining tube 2 exposed in the observation window of the gas extraction bin shell or on the main body outside the observation window of the gas extraction bin shell, and the outer diameter of the transparent inner lining tube 2 is 1mm-2mm smaller than the inner diameter of the gas extraction bin shell.

[0019] Preferably, the distance between the left end of the gas extraction bin shell and the left window of the observation window is set between 10mm and 15mm; the pressure cover is a cylindrical body and the inner cavity and the center hole are both provided with threads, the threads in the inner cavity of the pressure cover can be connected to the threads of the gas extraction bin shell, and the internal threads in the center hole of the pressure cover can be connected to the external threads of the screw; the center hole of the upper sealing joint is a light hole and the screw can pass through it.

[0020] Preferably, the internal thread in the center hole of the gland and the external thread of the lead screw are both trapezoidal threads, and the right end of the lead screw is connected to the handle; the transparent inner lining tube 1 and the transparent inner lining tube 2 are both glass inner lining tubes; the piston and the lead screw are movably connected.

[0021] Compared with the prior art, the remarkable effects of the present invention are as follows: the present invention can be applied to the detection of dissolved gas in oil wells, oil and gas gathering and transportation pipelines, and gathering and transportation pipelines in the storage tank area of ​​a joint station.

[0022] The rear end of the sampling joint in the utility model is connected to a gas storage bin, which can achieve gas-liquid replacement and form the first barrier during the gas extraction process, and can reduce or avoid the fluid medium from entering the gas extraction bin during the gas extraction process, thereby effectively ensuring the success rate of gas detection and reducing detection errors. The gas storage bin can also reduce the retention time of staff during the gas sample extraction process to ensure the safety of staff. The oil storage cavity provided at the connection between the gas storage bin short section and the lower joint of the gas storage bin forms a second barrier to prevent the fluid medium from entering the gas extraction bin. When a small amount of fluid medium enters the gas storage bin, it can be retained in the oil storage cavity and will not continue to enter the next space.

[0023] The utility model forms an oil storage cavity after the oil storage nipple is connected to the lower joint of the gas extraction bin, which is the third barrier to prevent the fluid medium from entering the gas extraction bin. The oil storage cavity is arranged in both the oil storage nipple and the gas storage bin nipple, thereby ensuring the purity of gas extraction to the greatest extent.

[0024] In addition, the piston propulsion method of the utility model adopts a screw hand-crank type, and a trapezoidal thread is used between the screw and the gland, which has a higher transmission efficiency. In particular, when the air pressure enters the air intake chamber, it will impact the piston, and at this time the screw can effectively prevent the risk of the piston being pushed out.

[0025] As an extraction device for gas detection in the process of gathering and transporting fluid media in oilfields, this device can effectively improve the operational safety of gas content detection at oilfield production sites and the accuracy of detection data, thereby ensuring the normal operation of gathering and transporting equipment. It can reduce the occurrence of pollution accidents, protect the environment, reduce the harm to operators, and improve work efficiency. Since the entire sampling process is sealed and closed, it can prevent the adverse consequences caused by the leakage of harmful gases during the gas extraction process, ensure production safety, and protect the environment.

[0026] In summary, the utility model has significant use effect and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the appearance structure of the utility model

[0029] Figure 2 yes Figure 1 Schematic diagram of the structural analysis of the gas storage tank.

[0030] Figure 3 yes Figure 1 Schematic diagram of the structural analysis of the middle gas chamber.

[0031] In the figure: sampling connector 1; gas storage bin 2, gas storage bin lower connector 2-1, gas storage bin short section 2-2, seal 2-3, transparent liner tube 1 2-4, seal 1 2-5, gas storage bin shell 2-6, gas storage bin upper connector 2-7; stop valve 3; gas collection bin 4, gas collection bin lower connector 4-1, oil storage short section 4-2, gas collection bin shell 4-3, pressure cover 4-4, rocker 4-5, transparent liner tube 2 4-6, lower sealing connector 4-7, piston 4-8, screw 4-9, upper sealing connector 4-10, pressure gauge connector 4-11, pressure gauge 4-12, exhaust valve connector 4-13, exhaust valve 4-14, sealing ring 4-15. DETAILED DESCRIPTION

[0032] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] See also Figures 1 to 3, a dissolved gas extraction device for oil and gas gathering and transportation pipeline, including a gas taking bin 4, in which a piston 4-8, a pressure gauge 4-12 and a transparent liner pipe 4-6 are arranged, wherein: the gas taking bin 4 is connected to a gas storage bin 2 connected to a sampling joint 1 through a stop valve 3; a transparent liner pipe 2-4 and a gas storage bin shell 2-6 are arranged in the gas storage bin 2, and the transparent liner pipe 2-4 is installed in the gas storage bin shell 2-6; two ends of the gas storage bin short section 2-2 are respectively connected to the gas storage bin lower joint 2-1 and the gas storage bin shell 2-6 connected to the gas storage bin upper joint 2-7 -6 connection; the piston 4-8 in the air extraction bin 4 is installed in a transparent liner tube 2-6 sealed by a lower sealing joint 4-7 and an upper sealing joint 4-10 and is connected to a lead screw 4-9 which is threadedly connected to a pressure cap 4-4; the two ends of the air extraction bin housing 4-3 equipped with a transparent liner tube 2-6 are respectively connected to an oil storage nipple 4-2 and a pressure cap 4-4, and a pressure gauge 4-12 and an exhaust valve 4-14 are both installed in an oil storage nipple 4-2 provided with an oil storage cavity and a gas passage; observation windows are provided in both the air storage bin housing 2-6 and the air extraction bin housing 4-3.

[0036] The utility model is provided with a gas storage bin 2 and a gas extraction bin 4 connected by a stop valve 3, and the gas storage bin 2 is connected to the sampling joint 1. The gas storage bin 2 is used to replace the gas sample with liquid in the detected pipeline during the process of taking gas samples, so as to ensure that the gas sample entering the gas extraction bin 4 has a high proportion of gas and a high purity of gas. It can reduce or avoid the fluid medium entering the gas extraction bin 4 during the gas extraction process, thereby effectively ensuring the success rate of gas detection and reducing the detection error. At the same time, sampling using the gas storage bin 2 can also reduce the retention time of the staff during the gas sample extraction process, improve work efficiency, and ensure the safety of the staff.

[0037] The gas collection bin 4 of the utility model is equipped with an oil storage short section 4-2 with an oil storage cavity and a gas channel, and a pressure gauge 4-12 and an exhaust valve 4-14 are installed therein. The oil storage cavity in the oil storage short section 4-2 can further ensure the purity of the gas, and the collected gas can enter the exhaust valve 4-14 through the gas channel. Then, the gas released from the exhaust valve 4-14 is detected by a gas detection colorimetric tube.

[0038] The utility model improves the pushing method of the piston 4-8, and uses a lead screw 4-9 threadedly connected to the gland 4-4 to push the piston 4-8, and pushes the high-purity gas entering the transparent inner liner tube 4-6 into the exhaust valve 14 and the gas detection colorimetric tube through the piston 4-8. It overcomes the defect of the prior art that when the piston is operated by a push rod, the gas enters the gas extraction chamber and forms an impact on the piston, and effectively prevents the risk of the piston 4-8 being pushed out. While ensuring the safety of the workers' operation and improving the work efficiency, it also guarantees the purity of the gas extraction to the greatest extent.

[0039] The dissolved gas extraction device is used as an extraction device for gas detection during the gathering and transportation of oilfield fluid media. The entire process of taking gas samples is in a fully closed state, which can effectively improve the operational safety of gas content detection at the oilfield production site and the accuracy of detection data, ensure the normal operation of gathering and transportation equipment, reduce the occurrence of pollution accidents and equipment losses, protect the environment, reduce harm to operators, and improve work efficiency. It ensures production safety and protects the environment, and has significant use effects and application value.

[0040] Based on the above embodiment 1, the utility model also has the following embodiments:

[0041] A preferred embodiment: both ends of the sealed transparent inner liner tube 2-4 are sealed by a seal 2-3 and a seal 2-5; both the seal 2-5 and the seal 2-3 are provided with a central hole and the outer circle is a stepped outer circle, the large diameter outer circle of the seal 2-5 and the seal 2-3 is consistent with the outer circle of the transparent inner liner tube 2-4 and the small diameter outer circle is equal to or smaller than the inner circle of the transparent inner liner tube 2-4; the small diameter outer circles of the seal 2-5 and the seal 2-3 are installed facing each other at both ends of the transparent inner liner tube 2-4; the seal 2-5 and the seal 2-3 are made of plastic material. The seal 2-5 and the seal 2-3 allow gas to pass through them while sealing the transparent inner liner tube 2-4.

[0042] A preferred embodiment: both ends of the outer circle of the gas storage bin short section 2-2 are provided with external threads and can be threadedly connected with the gas storage bin lower joint 2-1 and the gas storage bin shell 2-6 respectively; the inner cavity of the gas storage bin short section 2-2 is a non-equal diameter inner cavity, and the middle of the inner cavity of the gas storage bin short section 2-2 is a partition with a flow hole, and the inner diameter of the left side of the partition adjacent to the gas storage bin lower joint 2-1 is larger than the inner diameter of the right side of the partition adjacent to the seal 2-3, forming an oil storage cavity. The gas storage bin 2 forms the first barrier for the fluid medium to flow into the gas extraction bin 4 during the gas-liquid replacement process, and the oil storage cavity formed by the inner cavity on the right side of the partition in the gas storage bin short section 2-2 becomes the second barrier to prevent the fluid medium from entering the gas extraction bin 4. The function of the oil storage cavity at the connection between the gas storage bin short section 2-2 and the gas storage bin lower joint 2-1 is that when a small amount of fluid medium enters the gas storage bin 2, it can be retained in the oil storage cavity and will not continue to enter the next space.

[0043] A preferred embodiment: the lower joint 2-1 of the gas storage bin is a non-uniform cylindrical assembly with a center hole and the inner circles at both ends are provided with internal threads, which can be threadedly connected to the sampling joint 1 and the gas storage bin short section 2-2 respectively; the body of the sampling joint 1 with a center hole is provided with external threads at both ends and can be threadedly connected to the lower joint 2-1 of the gas storage bin and the sampling valve in the detected pipeline respectively; the outer wall of the middle part of the body of the sampling joint 1 is provided with a wrench square, which is convenient for using tools to connect with the sampling valve in the detected pipeline; the two ends of the upper joint 2-7 of the gas storage bin are provided with internal threads and external threads respectively and can be threadedly connected to the gas storage bin shell 2-6 and the stop valve 3 respectively.

[0044] A preferred embodiment: the gas passage in the inner cavity of the oil storage pup joint 4-2 is a cross-shaped hole, and the upper hole and the lower hole in the cross-shaped hole are both stepped holes with internal threads, which are respectively connected to the pressure gauge joint 4-11 and the exhaust valve joint 4-13 through the threaded holes in the stepped holes and are respectively connected to the pressure gauge 4-12 and the exhaust valve 4-14 through the pressure gauge joint 4-11 and the exhaust valve joint 4-13; the left inlet inner cavity of the oil storage pup joint 4-2 is threadedly connected to the lower joint 4-1 of the air intake bin and the right outlet outer circle is threadedly connected to the air intake bin shell 4-3; the left inlet inner cavity of the oil storage pup joint 4-2 is larger than the inner cavity of the right outlet, and an oil storage cavity is formed between the left inlet inner cavity and the lower joint 4-1 of the air intake bin; wrench squares are provided on both sides of the oil storage pup joint 4-2 where the pressure gauge 4-12 and the exhaust valve 4-14 are not installed, so as to facilitate the connection with the stop valve 3. The oil storage short section 4-2 provided in the gas extraction bin 4 of the utility model is the third barrier to prevent the fluid medium from entering the gas extraction bin 4. The oil storage short section 4-2 is provided with the same oil storage cavity as that in the gas storage bin short section 2-2, which can intercept the fluid medium from entering the transparent inner lining tube 2 4-6, thereby ensuring the purity of gas extraction to the greatest extent.

[0045] A preferred embodiment: the lower sealing joint 4-7 and the upper sealing joint 4-10 are both made of plastic material and are respectively installed at the two ends of the transparent inner liner tube 4-6; the outer circle of the lower sealing joint 4-7 is a stepped outer circle equipped with a sealing ring 4-15, and the stepped outer circle is respectively installed in the oil storage short section 4-2 and the transparent inner liner tube 4-6 and has an interference fit with the oil storage short section 4-2 and the transparent inner liner tube 4-6.

[0046] A preferred embodiment: the piston 4-8 is a cylinder whose outer circle is smaller than the inner circle of the transparent inner liner tube 4-6. The upper outer circle of the piston 4-8 is equipped with a sealing ring and forms an interference fit with the transparent inner liner tube 4-6, so that all the gas entering the transparent inner liner tube 4-6 can be pushed into the exhaust valve 4-14.

[0047] A preferred embodiment: a gas extraction scale is provided on the transparent inner lining tube 4-6 exposed in the observation window of the gas extraction bin shell 4-3 or on the main body outside the observation window of the gas extraction bin shell 4-3, and the outer diameter of the transparent inner lining tube 4-6 is 1mm-2mm smaller than the inner diameter of the gas extraction bin shell 4-3. Figure 1 The gas extraction scale shown in the figure is set on the transparent liner tube 2 4-6.

[0048] A preferred embodiment: the distance between the left end of the gas extraction bin shell 4-3 and the left window of the observation window is set between 10mm and 15mm to ensure the connection of the oil storage short section 4-2 in the gas extraction bin shell 4-3 and the installation of the transparent liner tube 4-6 in the gas extraction bin shell 4-3; the pressure cover 4-4 is a cylindrical body and the inner cavity and the center hole are both provided with threads, the threads in the inner cavity of the pressure cover 4-4 can be threadedly connected to the gas extraction bin shell 4-3, and the internal threads in the center hole of the pressure cover 4-4 can be connected to the external threads of the screw 9; the center hole of the upper sealing joint 4-10 is a light hole and the screw 9 can pass through it.

[0049] A preferred embodiment: the internal thread in the center hole of the gland 4-4 and the external thread of the lead screw 9 are both trapezoidal threads, which have a faster transmission speed. The right end of the lead screw 9 is connected to the crank 4-5. The use of the crank 4-5 makes the operation more convenient. Of course, a force application hole can be processed at the right end of the lead screw 9 and a force application rod can be inserted therein, or a wrench can be used to rotate the lead screw 9 using other tools. The transparent inner liner tube 1 2-4 and the transparent inner liner tube 2 4-6 are both glass inner liner tubes. The piston 4-8 is movably connected to the lead screw 9, and the piston 4-8 and the lead screw 9 can be disassembled. Compared with the inner liner tubes made of other transparent materials, the transparent inner liner tube 1 2-4 and the transparent inner liner tube 2 4-6 made of glass are easier to clean and maintain.

[0050] The method of using the utility model is as follows:

[0051] 1. Before operating this utility model, you must also wear appropriate protective equipment to ensure personal safety during operation.

[0052] 2. Carefully check the various threaded connections in the device to ensure that they are tightly connected and leak-free. Check whether the interior of the device is clean and free of dirt, especially the valves and pores, to ensure that they are clean and fluid. Check whether the air storage bin 2 and the air extraction bin 4 are clean, and confirm whether their sealing performance and various functions are normal.

[0053] 3. Complete gas-liquid replacement in gas storage bin 2:

[0054] 1) First, connect the sampling joint 1, gas storage tank 2, stop valve 3 and the sampling valve in the pipeline to be tested, and make sure they are tightened;

[0055] 2) Open the stop valve 3, let the liquid in the pipeline to be tested fill the gas storage bin 2, and then close the stop valve 3;

[0056] 3) Open the sampling valve in the pipeline to be tested, and the liquid in the gas storage tank 2 enters the pipeline to be tested under the action of gravity and replaces the gas in the pipeline to be tested;

[0057] 4) After all the gas and liquid in the gas storage bin 2 are replaced, close the sampling valve in the pipeline to be tested;

[0058] 5) During the gas-liquid replacement process, attention should be paid to the use of the device at all times to ensure that no large amount of fluid medium enters the gas storage bin 2.

[0059] 4. After the gas-liquid replacement in the gas storage bin 2 is completed, the gas extraction bin 4 is installed on the stop valve 3; at this time, the piston 4-8 should be at the position of the scale "0" on the transparent inner liner 4-6, and the exhaust valve 4-14 is in a closed state;

[0060] 5. Slowly open the stop valve 3 and observe the changes in the pressure gauge 4-12 at any time. After the pressure is balanced with the pressure in the air storage bin 2, slightly open the exhaust valve 4-14 for about 2-3 seconds to exhaust the air in the oil storage nipple 4-2, and then close the exhaust valve 4-14;

[0061] 6. Slowly shake the handle 4-5 to start sampling:

[0062] 1) Always pay attention to the use of the device to ensure that no fluid medium enters the transparent inner lining tube 2 4-6;

[0063] 2) If fluid medium enters, stop sampling immediately and start again from the beginning;

[0064] 3) Rotate the piston 4-8 through the screw 9 to the gas sample volume in the gas sampling scale on the transparent inner liner tube 4-6.

[0065] 7. After completing the sampling, close the stop valve 3, remove the stop valve 3 together with the gas collection bin 4 and transfer them to the detection area, and try to ensure that the stop valve 3 and the gas collection bin 4 are moved in a vertical state.

[0066] 8. Open the exhaust valve 4-14 to make the air pressure in the air taking bin 4 the same as the external air pressure, and then close the exhaust valve 4-14.

[0067] 9. Connect the exhaust valve 4-14 to the gas detection colorimetric tube. After opening the exhaust valve 4-14, slowly shake the handle 4-5 to push all the gas samples in the gas collection chamber 4 into the gas detection colorimetric tube; at the same time, pay attention to the pressure gauge 4-12 to ensure that the gas exhaust channel is successfully established. When the piston 4-8 is pushed to the lower sealing joint 4-7, close the exhaust valve 4-14. At this time, the operation of extracting dissolved gas is completed.

[0068] 10. During the entire operation, be sure to stay alert and ensure safety. For any steps that do not comply with regulations or may cause problems, the operation must be stopped immediately and checked; this device involves the extraction of toxic gases, please operate strictly in accordance with the operating manual to ensure a safe operating environment.

[0069] 11. After the operation is completed, clean all parts of the device to ensure accuracy and safety when used next time; check and tidy up the device to ensure that they are in good working condition for next use.

[0070] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A dissolved gas extraction device for oil and gas gathering and transportation pipelines, comprising a gas extraction chamber, in which a piston, a pressure gauge and a transparent liner are arranged, wherein: The gas extraction bin is connected to the gas storage bin connected to the sampling joint through a stop valve; a transparent inner liner tube 1 and a gas storage bin shell are provided in the gas storage bin, and the transparent inner liner tube 1 is installed in the gas storage bin shell; the two ends of the gas storage bin short section are respectively connected to the gas storage bin lower joint and the gas storage bin shell connected to the gas storage bin upper joint; the piston in the gas extraction bin is installed in the transparent inner liner tube 2 sealed by the lower sealing joint and the upper sealing joint and connected to the lead screw in the gland by threading; the two ends of the gas extraction bin shell equipped with the transparent inner liner tube 2 are respectively connected to the oil storage short section and the gland, and the pressure gauge and the exhaust valve are both installed in the oil storage short section provided with the oil storage cavity and the gas channel; Observation windows are provided in the outer shell of the gas storage bin and the outer shell of the gas extraction bin.

2. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines according to claim 1, characterized in that: The two ends of the sealed transparent inner liner tube 1 are sealed by seal 2 and seal 1; seal 1 and seal 2 are both provided with center holes and the outer circles are both stepped outer circles, the large diameter outer circles of seal 1 and seal 2 are consistent with the outer circle of transparent inner liner tube 1 and the small diameter outer circles are equal to or smaller than the inner circle of transparent inner liner tube 1; the small diameter outer circles of seal 1 and seal 2 are installed facing each other at the two ends of transparent inner liner tube 1; seal 1 and seal 2 are made of plastic material.

3. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 2, characterized in that: Both ends of the outer circle of the air storage bin short section are provided with external threads and can be threadedly connected to the lower joint of the air storage bin and the outer shell of the air storage bin respectively; the inner cavity of the air storage bin short section is a non-equal diameter inner cavity, and the middle of the inner cavity of the air storage bin short section is a partition with a flow hole, and the inner diameter of the left side of the partition adjacent to the lower joint of the air storage bin is larger than the inner diameter of the right side of the partition adjacent to the seal 2, forming an oil storage cavity.

4. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 2, characterized in that: The lower joint of the gas storage bin is a non-uniform cylindrical assembly with a center hole and the inner circles at both ends are provided with internal threads, which can be threadedly connected to the sampling joint and the gas storage bin short section respectively; the body of the sampling joint with a center hole is provided with external threads at both ends and can be threadedly connected to the lower joint of the gas storage bin and the sampling valve in the detected pipeline respectively; the outer wall of the middle part of the body of the sampling joint is provided with a wrench square; the two ends of the upper joint of the gas storage bin are provided with internal threads and external threads respectively and can be threadedly connected to the gas storage bin shell and the stop valve respectively.

5. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 1, characterized in that: The gas passage in the inner cavity of the oil storage pup joint is a cross-shaped hole, and the upper hole and the lower hole in the cross-shaped hole are both stepped holes with internal threads, which are respectively connected to the pressure gauge joint and the exhaust valve joint through the threaded holes in the stepped holes, and are respectively connected to the pressure gauge and the exhaust valve through the pressure gauge joint and the exhaust valve joint; the left inlet inner cavity of the oil storage pup joint is threadedly connected to the lower joint of the air intake bin, and the right outlet outer circle is threadedly connected to the outer shell of the air intake bin; the left inlet inner cavity of the oil storage pup joint is larger than the inner cavity of the right outlet, and an oil storage cavity is formed between the left inlet inner cavity and the lower joint of the air intake bin; wrench squares are provided on both sides of the oil storage pup joint where the pressure gauge and the exhaust valve are not installed.

6. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 5, characterized in that: The lower sealing joint and the upper sealing joint are both made of plastic material and are respectively installed at the two ends of the transparent inner liner tube 2; the outer circle of the lower sealing joint is a stepped outer circle with a sealing ring, and the stepped outer circle is respectively installed in the oil storage short section and the transparent inner liner tube 2 and has an interference fit with the oil storage short section and the transparent inner liner tube 2.

7. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 1, characterized in that: The piston is a cylinder whose outer circle is smaller than the inner circle of the second transparent inner liner tube. A sealing ring is installed on the upper outer circle of the piston and an interference fit is formed between the piston and the second transparent inner liner tube.

8. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 7, characterized in that A gas extraction scale is provided on the transparent inner liner tube 2 exposed in the observation window of the gas extraction bin shell or on the main body outside the observation window of the gas extraction bin shell. The outer diameter of the transparent inner liner tube 2 is 1mm-2mm smaller than the inner diameter of the gas extraction bin shell.

9. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 6, characterized in that: The distance between the left end of the gas extraction bin shell and the left window of the observation window is set between 10mm and 15mm; the pressure cover is a cylindrical body and the inner cavity and the center hole are both provided with threads, the threads in the inner cavity of the pressure cover can be connected with the threads of the gas extraction bin shell, and the internal threads in the center hole of the pressure cover can be connected with the external threads of the screw; the center hole of the upper sealing joint is a light hole and the screw can pass through it.

10. The device for extracting dissolved gas from oil and gas gathering and transportation pipelines as claimed in claim 9, characterized in that: The internal thread in the center hole of the gland and the external thread of the lead screw are both trapezoidal threads, and the right end of the lead screw is connected to the handle; the transparent inner lining tube 1 and the transparent inner lining tube 2 are both glass inner lining tubes; the piston and the lead screw are movably connected.

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