Single well pipeline, gathering trunk line hydrogen sulfide sealing automatic monitoring device

Abstract

The utility model discloses a single well pipeline, hydrogen sulfide closed automatic monitoring device of oil gathering trunk line, including detection casing, the detection casing top sets up linear drive arrangement, the detection casing inside sets up sealing device, sealing device is connected to the output shaft of linear drive arrangement, the detection casing is divided into air cavity, detection cavity by sealing device, the detection casing sets up exhaust port in air cavity, the detection casing sets up gas guide port in detection cavity, the detection casing sets up detection mouth, and the detection mouth is communicated with air cavity or detection cavity under the control of sealing device, and the gas guide port is connected gas -liquid separation collection device. The utility model will collect the gas in the pipeline, measure the hydrogen sulfide content in natural gas, and push the measurement gas back to the original flow after measuring, and the hydrogen sulfide gas that escapes a little is absorbed through the hydrogen sulfide removing agent, which fundamentally eliminates the environmental air pollution.

Description

Technical Field

[0001] This utility model relates to the field of petroleum detection technology, specifically a closed automatic monitoring device for hydrogen sulfide in single-well pipelines and oil gathering trunk lines. Background Technology

[0002] Hydrogen sulfide is a highly toxic and corrosive gas, widely present in gas fields and associated gases from oil extraction. It accelerates the corrosion of production equipment; concentrations exceeding 10 mg / m³ can significantly reduce its concentration. 3 This poses a health hazard to oil and gas processing operators, with concentrations exceeding 1000 mg / m³. 3 Contact with hydrogen sulfide can cause acute poisoning within seconds. Therefore, it is crucial to accurately monitor the hydrogen sulfide content in natural gas at all times during natural gas production sites and to perform appropriate operations based on the content to ensure personal safety and equipment operation. According to the SN / T2943-2011 "Hydrogen Sulfide Sampling and Testing Procedure," the hydrogen sulfide content in pipeline natural gas is detected using the glass tube coloring method. During measurement, the natural gas is vented at the pipeline testing point, and the test tube is placed at the front end of a negative pressure gas sampler to draw in natural gas. The reagent inside the test tube reacts with the hydrogen sulfide, and the hydrogen sulfide content is read. However, natural gas is flammable and explosive. Venting during the testing process causes combustible gases to escape into the atmosphere, causing air pollution and posing safety hazards at the production site. The test tube is a disposable glass container, resulting in resource waste. Furthermore, air can easily be introduced into the negative pressure gas sampler during gas extraction, affecting the accuracy of the test. In actual production sampling operations, to ensure the health of operators, two operators wearing positive pressure air respirators need to work together, making the operation complex and reducing the timeliness of the test.

[0003] Announcement No. CN220647892U discloses a gas collection pipeline for easy gas detection, including a connecting pipe. A diversion pipe is fixedly connected to the middle of the upper end of the connecting pipe. A valve is fixedly connected to the middle of the outer surface of the diversion pipe. A collection mechanism is fixedly connected to the upper right end of the connecting pipe. Support seats are fixedly connected to the left and right outer surfaces of the connecting pipe. A support box is fixedly connected between the lower ends of the two support seats. Sealing mechanisms are installed at the left and right ends of the connecting pipe. Gas pipelines are installed on the opposite sides of the two sealing mechanisms.

[0004] This existing technology is used in natural gas pipelines and cannot be used for hydrogen sulfide measurement in oil pipelines.

[0005] Announcement No. CN108487906B discloses a closed-loop sampling and detection device and method for hydrogen sulfide at the wellhead of an oil well. The device consists of two parts: a sampling assembly and a detection assembly. The detection assembly is installed on the upper part of the sampling assembly. The sampling assembly includes a flow section, a sampling guide pipe, a sampling valve, a sampling tube, a lower connector of the sampler, a spring, a cone valve cone, and a cone valve seat. The detection assembly includes a quick connector, a cone valve top rod, a colorimetric tube connector, a rubber hose, a colorimetric tube, a sampling pump barrel, a piston, a rubber stopper, a piston guide rod, and a handwheel.

[0006] The existing technology requires manual installation of the testing assembly, manual installation and removal of the colorimetric tubes, and residual hydrogen chloride gas can affect the health of the operators.

[0007] Publication No. CN214174103U discloses a protective cap for a corrosion monitoring probe in an associated gas system, comprising a protective cap body, a flow guide hole, and a plug. The protective cap body is a stepped metal cylinder with an internal thread at the upper end for connection to the probe rod, and uniformly symmetrical flow guide holes in the upper middle part. The plug is a metal cylinder welded to the lower circumference of the protective cap body. The gaseous test medium can flow through the flow guide hole to the probe, while the liquid test medium formed from wet hydrogen sulfide is stored in the lower part of the protective cap. The probe can simultaneously measure the corrosion of both the gaseous test medium and the liquid test medium formed from wet hydrogen sulfide.

[0008] The probes in this existing technology need to be in contact with the medium for a long time, which reduces their service life.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the existing technology and solve at least one of the technical problems mentioned in the background technology, this utility model provides an automatic monitoring device for hydrogen sulfide sealing of single-well pipelines and oil gathering trunk lines.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] An automatic hydrogen sulfide monitoring device for single-well pipelines and oil gathering trunk lines includes a detection housing, a linear drive device at the top of the detection housing, a sealing device inside the detection housing, an output shaft of the linear drive device connected to the sealing device, and the sealing device dividing the detection housing into an air chamber and a detection chamber. The detection housing has an exhaust port in the air chamber, an air guide port in the detection chamber, and a detection port, which, under the control of the sealing device, communicates with either the air chamber or the detection chamber. The air guide port is connected to a gas-liquid separation and collection device.

[0013] Furthermore, the sealing device is a piston, which seals against the inner wall of the detection housing, and the linear drive device is an electric push rod, with the piston connected to the push rod end of the electric push rod.

[0014] Furthermore, the detection port is connected to a detection tube, the port of the detection tube is connected to a gas detector, the gas detector is a hydrogen sulfide gas detector, the probe of the gas detector is located in the detection tube, and the gas detector is equipped with a data display table.

[0015] Furthermore, the exhaust port is connected to a venting dosing device, which includes a dosing pipe and an exhaust pipe. The dosing pipe is connected to the exhaust port, and the exhaust pipe is connected to the dosing pipe. The dosing pipe is filled with a hydrogen sulfide removal agent.

[0016] Furthermore, a retaining ring is provided at one end of the dosing pipe near the exhaust port, and a filter screen is placed on the retaining ring to prevent the hydrogen sulfide removal agent from falling into the detection housing.

[0017] Furthermore, the separation and collection device includes a gas collection pipe;

[0018] Specifically, an oil inlet valve is provided at one end of the gas collecting pipe, an oil outlet valve is provided at the other end of the gas collecting pipe, and a connection port is provided at the upper end of the gas collecting pipe wall, which is connected to the detection housing;

[0019] Specifically, a ball-blocking mechanism is provided on the bottom surface of the detection housing around the air inlet, and a float is provided inside the ball-blocking mechanism. After the float floats up, it can sit on the air inlet and seal the air inlet.

[0020] Specifically, a pressure sensor is installed on the wall of the gas collecting pipe to measure the pressure of the gas collecting pipe.

[0021] Furthermore, the bottom surface of the detection housing is a conical surface, and the air inlet is located at the top of the conical surface.

[0022] Furthermore, the ball-blocking mechanism is a mesh cylinder, which is connected to the lower end face of the detection housing and is located on the outer periphery of the air inlet.

[0023] Furthermore, the ball-blocking mechanism comprises at least three rods evenly distributed circumferentially around the air inlet. The distance between the rods is less than the diameter of the float. The upper end of each rod is connected to the lower end face of the detection housing, and the lower end of each rod is connected to a stop rod, or the distance between the lower end of the rod and the air collecting pipe is less than the radius of the float.

[0024] Furthermore, it also includes a programmable controller, wherein the oil inlet valve and the oil outlet valve are both electric valves, and the programmable controller is electrically connected to the oil inlet valve, the oil outlet valve, the linear drive device, the pressure sensor, and the gas detector.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. This utility model collects gas from pipelines and measures the hydrogen sulfide content in natural gas. After measurement, the measured gas is returned to the original process. For the small amount of hydrogen sulfide gas that escapes, it is absorbed by hydrogen sulfide removal agents, thus fundamentally eliminating environmental air pollution. This utility model can monitor the hydrogen sulfide content in oil and gas pipelines at any time, achieving full automation, full enclosure, and zero emissions, reducing safety risks, reducing labor intensity, and achieving green and efficient production.

[0027] 2. The gas detector of this utility model is in contact with air in standby mode, which avoids the aging of the detection probe in the gas detector and improves the service life of the gas detector.

[0028] 3. This utility model uses a linear drive device, a sealing device, a control valve, and a pressure transmitter to control the pressure of the gas being detected, enabling the gas detector to operate within the optimal pressure range. It detects hydrogen sulfide at constant temperature and pressure, resulting in more accurate hydrogen sulfide detection values. The hydrogen sulfide value at room temperature can be calculated from the numerical values.

[0029] 4. This utility model uses a float ball to prevent oil and water in the pipeline from entering the detection device, thereby achieving the concentration of dissolved gas.

[0030] 5. This utility model achieves automated gas detection and generates data curves through a programmable controller. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a closed automatic monitoring device for hydrogen sulfide in a single-well pipeline and oil gathering trunk line according to this utility model.

[0032] In the diagram: 1. Main pipe; 2. Gas collection pipe; 3. Detection housing; 31. Exhaust port; 32. Air guide port; 33. Detection port; 4. Linear drive device; 5. Sealing device; 6. Oil inlet valve; 7. Oil outlet valve; 8. Ball baffle mechanism; 9. Float ball; 10. Pressure sensor; 11. Gas detector; 12. Dosing pipe; 13. Exhaust pipe; 14. Air chamber A; 5. Detection chamber B. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1 This utility model provides an automatic monitoring device for hydrogen sulfide in a single-well pipeline and oil gathering trunk line, comprising a detection housing 3, a linear drive device 4 installed on the top of the detection housing 3, the output shaft of the linear drive device 4 inserted into the detection housing 3, and a sealing device 5 connected to the end of the output shaft of the linear drive device 4. The sealing device 5 divides the detection housing 3 into an air chamber A and a detection chamber B. The detection housing 3 has an exhaust port 31 in the air chamber A and an air guide port 33 in the detection chamber B. The detection housing 3 has a detection port 32, which is connected to the air chamber A or the detection chamber B under the control of the sealing device 5. The air guide port 33 is connected to a separation and collection device for gas-liquid separation.

[0035] Furthermore, the separation and collection device includes a gas collecting pipe 2, with an oil inlet valve 6 at one end and an oil outlet valve 7 at the other end. A connection port is provided at the upper end of the gas collecting pipe 2, which is connected to the detection housing 3. A ball-blocking mechanism 8 is provided on the bottom surface of the detection housing 3 around the gas inlet 33. A float ball 9 is provided inside the ball-blocking mechanism 8. The float ball 9 has a density greater than that of dissolved gas and a density less than that of oil and water. After the float ball 9 floats up, it can sit on the gas inlet 33, sealing the gas inlet 33 and preventing oil and water from entering the monitoring device. A pressure sensor 10 is provided on the wall of the gas collecting pipe 2 for measuring the pressure of the gas collecting pipe 2.

[0036] Specifically, the oil inlet valve 6 and the oil outlet valve 7 are used to connect with the main pipeline 1.

[0037] Specifically, the gas collecting pipe 2 is made of a thickened material resistant to hydrogen sulfide corrosion.

[0038] Specifically, the bottom surface of the detection housing 3 is a conical surface, and the air inlet 33 is located at the top of the conical surface, which improves the sealing effect of the float 9 on the air inlet 33.

[0039] Specifically, the detection housing 3 is connected to the gas collecting pipe 2, the gas collecting pipe 2 to the oil inlet valve 6, the gas collecting pipe 2 to the oil outlet valve 7, the oil inlet valve 6 to the main pipeline 1, and the oil outlet valve 7 to the main pipeline 1, all via flanges and bolts, and sealed with gaskets.

[0040] Preferably, the ball-blocking mechanism 8 is a mesh cylinder, and the lower end face of the detection housing 3 is provided with a threaded groove on the outer periphery of the air inlet 33. The upper end of the mesh cylinder is connected to the threaded groove by a thread.

[0041] In another preferred embodiment, the ball-blocking mechanism 8 consists of at least three rods evenly distributed circumferentially around the air inlet 33. The distance between the rods is less than the diameter of the float 9. The upper end of the rod is connected to the lower end face of the detection housing 3 by a threaded head or welding. The lower end of the rod is connected to a stop rod, or the distance between the lower end of the rod and the air collecting pipe 2 is less than the radius of the float 9.

[0042] Furthermore, the detection port 32 is connected to the detection tube 34, and the port of the detection tube 34 is connected to the gas detector 11. The gas detector 11 is a hydrogen sulfide gas detector, and the probe of the gas detector 11 is located in the detection tube 34. The gas detector 11 is equipped with a data display table to facilitate the operator to read the hydrogen sulfide gas content.

[0043] Furthermore, the sealing device 5 is a piston, which seals against the inner wall of the detection housing 3, and the linear drive device 4 is an electric push rod, with the piston connected to the push rod end of the electric push rod.

[0044] Furthermore, the exhaust port is connected to a venting dosing device, which includes a dosing pipe 12 and an exhaust pipe 13. The dosing pipe 12 is connected to the exhaust port, and the exhaust pipe 13 is connected to the dosing pipe 12. The dosing pipe 12 is filled with a hydrogen sulfide removal agent.

[0045] Specifically, a baffle ring is provided at one end of the dosing pipe 12 near the exhaust port, and a filter screen is placed on the baffle ring to prevent the hydrogen sulfide removal agent from falling into the detection housing 3.

[0046] Specifically, the dosing tube 12 is connected to the detection housing 3 by threads or welding.

[0047] Furthermore, it also includes a programmable controller. The oil inlet valve 6 and the oil outlet valve 7 are both electric valves. The programmable controller is electrically connected to the oil inlet valve 6, the oil outlet valve 7, the linear drive device 4, the pressure sensor 10, and the gas detector 11 to realize automated detection.

[0048] Operating procedures for an automatic hydrogen sulfide sealing monitoring device for single-well pipelines and oil gathering trunk lines:

[0049] S1. Connect the oil inlet valve 6 and the oil outlet valve 7 to the main pipeline 1, so that the gas collection pipe 2 and the detection housing 3 are located above the main pipeline 1, the oil inlet valve 6 and the oil outlet valve 7 are in the normally open state, and the oil and gas are automatically collected in the gas collection pipe 2.

[0050] Oil and water will first enter the gas collecting pipe 2. At this time, the float ball 9 will float up and block the gas inlet 33 to prevent oil and water from entering the detection chamber B. When there is enough dissolved gas in the gas collecting pipe 2, the float ball 9 will move down and open the gas inlet 33.

[0051] S2. When performing hydrogen sulfide detection, the pressure of the gas in detection chamber B is equal to the pressure of the production process and is higher than atmospheric pressure. It needs to be depressurized to reach normal pressure to meet the requirements of the detection conditions.

[0052] The programmable controller closes the inlet valve 6 and outlet valve 7. The pressure sensor 10 collects the pressure in the detection chamber B. The linear drive device 4 drives the sealing device 5 upward. The sealing device 5 moves between the detection hole and the exhaust port. The pressure in the detection chamber B and the linear drive device 4 are interlocked. When the pressure reaches atmospheric pressure, which is about 0.1 MPa, the linear drive device 4 stops moving. The gas detector 11 enters the optimal working gas pressure, measures the accurate hydrogen sulfide content, and transmits it to the programmable controller to form a data curve.

[0053] S3. After the test is completed, the linear drive device 4 causes the sealing device 5 to move downward, compressing the detection chamber B. When the sealing device 5 moves to its original position, the oil inlet valve 6, the oil outlet valve 7, the main pipeline 1 and the gas collection pipe 2 are connected, and the gas in the detection chamber B returns to the production process. The small amount of hydrogen sulfide remaining in the detection tube 34 escapes into the air chamber A and is absorbed by the hydrogen sulfide removal agent in the venting and dosing device.

[0054] S4. The overall heating of the casing prevents oil and water from freezing and blockage, making it more adaptable to cold environments and ensuring the stability of the equipment.

[0055] This invention allows the gas detector to remain exposed to air for extended periods, preventing probe aging and improving the accuracy of hydrogen sulfide detection values. Furthermore, this invention generates no waste liquid or gas during hydrogen sulfide detection, and the constant temperature and pressure operation ensures more accurate readings.

[0056] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0057] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines, comprising a detection housing, characterized in that, A linear drive device is provided on the top of the detection housing, and a sealing device is provided inside the detection housing. The output shaft of the linear drive device is connected to the sealing device, and the sealing device divides the detection housing into an air cavity and a detection cavity. The detection housing has an exhaust port in the air cavity, an air guide port in the detection cavity, and a detection port. The detection port is connected to the air cavity or the detection cavity under the control of a sealing device, and the air guide port is connected to a gas-liquid separation and collection device.

2. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 1, characterized in that, The sealing device is a piston, which seals against the inner wall of the detection housing. The linear drive device is an electric push rod, and the piston is connected to the push rod end of the electric push rod.

3. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 2, characterized in that, The detection port is connected to the detection tube, and the port of the detection tube is connected to the gas detector, which is a hydrogen sulfide gas detector. The probe of the gas detector is located in the detection tube, and the gas detector is equipped with a data display table.

4. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 1, characterized in that, The exhaust port is connected to the venting and dosing device, which includes a dosing pipe and an exhaust pipe. The dosing pipe is connected to the exhaust port, and the exhaust pipe is connected to the dosing pipe. The dosing pipe is filled with a hydrogen sulfide removal agent.

5. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 4, characterized in that, A baffle ring is installed at one end of the dosing pipe near the exhaust port. A filter screen is placed on the baffle ring to prevent the hydrogen sulfide removal agent from falling into the detection housing.

6. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 3, characterized in that, The separation and collection device includes a gas collection pipe; An oil inlet valve is provided at one end of the gas collecting pipe, an oil outlet valve is provided at the other end of the gas collecting pipe, and a connection port is provided at the upper end of the gas collecting pipe wall, which is connected to the detection housing; The bottom surface of the detection housing is provided with a ball-blocking mechanism on the outer periphery of the air inlet. A float ball is provided inside the ball-blocking mechanism. After the float ball floats up, it can sit on the air inlet and seal the air inlet. The gas collecting pipe wall is equipped with a pressure sensor for measuring the gas collecting pipe pressure.

7. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 6, characterized in that, The bottom surface of the detection housing is a conical surface, and the air inlet is located at the top of the conical surface.

8. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 6, characterized in that, The ball-blocking mechanism is a mesh cylinder, which is connected to the lower end face of the detection housing and is located on the outer periphery of the air inlet.

9. The automatic monitoring device for hydrogen sulfide sealing in single-well pipelines and oil gathering trunk lines according to claim 6, characterized in that, The ball-blocking mechanism consists of at least three rods evenly distributed circumferentially around the air inlet. The distance between the rods is less than the diameter of the float. The upper end of each rod is connected to the lower end face of the detection housing, and the lower end of each rod is connected to a stop rod, or the distance between the lower end of the rod and the air collection pipe is less than the radius of the float.

10. The automatic monitoring device for hydrogen sulfide sealing in a single-well pipeline and oil gathering trunk line according to claim 6, characterized in that, It also includes a programmable controller, wherein the oil inlet valve and the oil outlet valve are both electric valves, and the programmable controller is electrically connected to the oil inlet valve, the oil outlet valve, the linear drive device, the pressure sensor, and the gas detector.

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