Pressure reducing valve group for sulfur-containing natural gas conveying pipeline, pipeline system and well site
By setting up root valves and bypass pipelines in the pressure reducing valve group of sulfur-containing natural gas delivery pipelines to control the flow and exhaust of natural gas, the problem of gas dissipation during safety valve maintenance or dismantling is solved, and construction safety and resource utilization efficiency are improved.
Patent Information
- Application Number
- CN202421943761.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-08-12
AI Technical Summary
During the maintenance or dismantling of safety valves of sulfur-containing natural gas transmission pipelines, the prior art is difficult to effectively control gas dissipation, which increases the risk of personnel poisoning and high-pressure airflow injury, and requires frequent shutdown and emptiation, affecting production and resource utilization.
A pressure reducing valve group is designed, including a root valve, an upstream valve, a first bypass valve and a safety valve. By setting the root valve between the main pipe, the venting pipe and the bypass pipe, the flow of sulfur-containing natural gas is controlled, and the root valve is closed and the gas is exhausted through the bypass pipe to ensure the reduction of gas dissipation during the maintenance or dismantling of the safety valve.
It effectively reduces the risk of evacuation of sulfur-containing natural gas, improves construction safety, reduces resource waste caused by shutdown and venting, and ensures the continuity and safety of natural gas supply.
Smart Images
Figure CN222836684U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of natural gas pipelines, in particular to a pressure reducing valve group, a pipeline system and a well site used for a sulfur-containing natural gas transmission pipeline. Background Art
[0002] In order to ensure the safe operation of natural gas pipelines and pressure vessels during the process of natural gas extraction and transportation, safety control devices are designed and installed on pressure pipelines and pressure vessels. The most commonly used method is to set up safety valves to release natural gas so that when the station is under maintenance or an accident occurs, the gas supply to the downstream will not be interrupted, thereby ensuring the continuity and safety of the natural gas supply.
[0003] In the prior art, the safety valve is arranged in the venting pipeline, and there is a gate valve upstream and downstream of the safety valve, which is used to isolate the upstream and downstream processes when the safety valve is inspected or disassembled. The venting pipeline also includes a bypass pipeline, which is used to connect the upstream of the gate valve upstream of the safety valve and the downstream of the gate valve downstream of the safety valve. The bypass pipeline is also provided with a bypass gate valve and a bypass stop valve. During normal production, the safety valve is in a closed state, the gate valves upstream and downstream of the safety valve are in an open state, and the bypass gate valve and the bypass stop valve are in a closed state; when the safety set pressure is exceeded in the main pipeline or pressure vessel, the safety valve automatically opens to release the excess gas into the closed venting system through the venting pipeline to ensure the safety of the main pipeline and the container.
[0004] When inspecting or disassembling the safety valve of a conventional natural gas gathering and transmission pipeline, it is only necessary to close the upstream and downstream gate valves of the safety valve, open the bypass gate valve and stop valve, allow the natural gas to flow to the venting system through the bypass pipeline, then disassemble the safety valve, reinstall it after verification, and then open the upstream and downstream gate valves.
[0005] When the safety valve of the sour natural gas transmission pipeline is inspected or disassembled, the following problems will occur when using the existing technology: after closing the upstream and downstream gate valves of the safety valve, the sour natural gas still exists in the pipeline between the upstream and downstream gate valves of the safety valve. At this time, disassembling the safety valve will increase the probability of sour natural gas escaping and cause the risk of poisoning. Moreover, when the gas pressure in the pipeline between the upstream and downstream gate valves of the safety valve is high, there is a risk of high-pressure airflow injuring people when disassembling the safety valve. Therefore, it is often necessary to close and vent the well station and related process pipelines before carrying out maintenance work, which not only affects the stable production of the gas well, but also causes a large amount of resource waste. Utility Model Content
[0006] The utility model aims to overcome the problem in the prior art that when the safety valve of a sour natural gas transmission pipeline is inspected or disassembled, the safety valve is disassembled after closing the upstream and downstream gate valves of the safety valve, which increases the probability of sour natural gas escaping and causes the risk of personnel poisoning. A pressure reducing valve group, pipeline and well site for a sour natural gas transmission pipeline are provided.
[0007] In a first aspect, the utility model provides a pressure reducing valve group for a sour natural gas transmission pipeline, comprising a root valve, wherein the root valve is arranged in a venting pipeline, and a main pipeline can be respectively connected to the venting pipeline and a bypass pipeline through the root valve, and the venting pipeline and the bypass pipeline are both connected to a venting system, an upstream valve is arranged between the root valve and the venting system, a safety valve is arranged between the upstream valve and the venting system, the upstream valve and the safety valve are both arranged in the venting pipeline, the bypass pipeline is provided with a first bypass valve, and the first bypass valve is arranged between the root valve and the venting system, and closing the root valve can prevent sour natural gas from entering the venting pipeline and the bypass pipeline from the main pipeline respectively.
[0008] During normal production, the root valve and the upstream valve are in the open state, and the first bypass valve and the safety valve are in the closed state. When the pressure in the venting pipeline reaches the set threshold of the safety valve, the safety valve automatically opens to allow the sour natural gas to enter the venting system through the venting pipeline until the pressure in the venting pipeline is less than the set threshold of the safety valve. The safety valve automatically closes to prevent the sour natural gas from moving from the main pipeline to the venting system.
[0009] When the safety valve needs to be disassembled or overhauled, first close the root valve to prevent the sour natural gas from moving from the main pipeline to the vent pipeline and the bypass pipeline respectively, then open the first bypass valve to discharge the sour natural gas in the vent pipeline to the vent system through the bypass pipeline until the gas pressure in the vent pipeline and the bypass pipeline is balanced, then close the upstream valve and then disassemble or overhaul the safety valve, which can reduce the probability of sour natural gas escaping and improve the safety of construction.
[0010] By arranging the root valve between the main pipeline and the vent pipeline, and between the main pipeline and the bypass pipeline, the movement of sour natural gas from the main pipeline to the vent pipeline and the bypass pipeline can be controlled simultaneously. When the equipment downstream of the root valve is overhauled, the root valve can be closed to prevent the movement of natural gas from the main pipeline to the vent pipeline and the bypass pipeline, respectively, thereby reducing the possibility of sour natural gas spilling out and improving the safety of construction. By arranging the upstream valve between the root valve and the safety valve, when the root valve is not closed tightly and causes leakage, the upstream valve can timely block the sour natural gas flowing to the vent pipeline, thereby improving the reliability of the valve group. By arranging the first bypass valve, and opening it when the safety valve is overhauled, the sour natural gas in the vent pipeline between the upstream valve and the root valve is output to the vent system through the bypass pipeline, thereby reducing the possibility of sour natural gas leaking through the upstream valve and improving the safety of construction when overhauling the safety valve.
[0011] Preferably, a downstream valve is further provided between the safety valve and the venting system.
[0012] During normal production operations, the upstream valve and the downstream valve are in the open state. When the safety valve needs to be inspected and disassembled, the downstream valve is also closed when the upstream valve is closed. By setting the downstream valve and closing the downstream valve when inspecting the safety valve, the risk of sour natural gas backflow due to pressure changes in the venting system or other pipeline parts can be reduced, that is, the risk of sour natural gas flowing from the downstream valve to the safety valve is reduced, thereby improving the safety of construction; at the same time, by setting the downstream valve and closing the downstream valve when inspecting the safety valve, the probability of different media mixing at the safety valve can be reduced, thereby improving the safety of the valve group.
[0013] Preferably, a second bypass valve is further provided between the first bypass valve and the venting system.
[0014] During normal production operations, the first bypass valve and the second bypass valve are in a closed state. When the safety valve needs to be inspected and disassembled, the second bypass valve is also opened when the first bypass valve is opened. By setting the second bypass valve, the gas pressure in the bypass pipeline can be adjusted more accurately and flexibly; at the same time, the probability of different media mixing at the first bypass valve can be reduced, thereby improving the safety of the valve group.
[0015] Preferably, the tripping pressure of the safety valve is between 9.6 MPa and 40 MPa. Depending on the design pressure of the pipeline, the tripping pressure of the safety valve can be kept consistent with the design pressure.
[0016] Preferably, the root valve, the upstream valve, the downstream valve and the first bypass valve are all gate valves.
[0017] By setting the above valve as a gate valve, since the medium through hole inside the gate valve is directly connected to the pipeline, the sour natural gas does not change its flow direction when flowing through, so the flow resistance is small. When opening and closing, the movement direction of the valve plate is perpendicular to the flow direction of the sour natural gas, and the flow resistance of the sour natural gas is also small, which is convenient for operation and improves the convenience and reliability of the valve group.
[0018] Preferably, the root valve may also be configured as a ball valve.
[0019] Preferably, the second bypass valve is a stop valve.
[0020] By setting the second bypass valve as a stop valve, the stop valve can provide good sealing performance in the fully closed state, reducing the risk of leakage of sour natural gas, and the stop valve can be designed to withstand higher working pressures, thereby improving the safety of the valve group.
[0021] In the second aspect, the utility model provides a pipeline system, which is equipped with a pressure reducing valve group for a sour natural gas transmission pipeline, and can inspect and repair the safety valve under the normal production state of sour natural gas, thereby reducing the possibility of sour natural gas spillage and improving the safety of construction when inspecting the safety valve.
[0022] In a third aspect, the utility model provides a well site, which adopts the above-mentioned pipeline system, reduces the probability of needing to shut down the well site to inspect and repair the safety valve of the sulfur-containing natural gas transmission pipeline, and reduces the large amount of resource waste caused by the inspection and disassembly of the safety valve.
[0023] Compared with the prior art, the utility model has the following beneficial effects:
[0024] 1. The utility model provides a pressure reducing valve group for a sour natural gas transmission pipeline. By arranging the root valve between the main pipeline and the vent pipeline, and between the main pipeline and the bypass pipeline, the sour natural gas can be controlled to move from the main pipeline to the vent pipeline and the bypass pipeline respectively. When the equipment downstream of the root valve is inspected and repaired, the root valve can be closed to prevent the natural gas from moving from the main pipeline to the vent pipeline and the bypass pipeline respectively, thereby reducing the possibility of sour natural gas spilling out and improving the safety of construction.
[0025] 2. The utility model provides a pipeline system, which is provided with a pressure reducing valve group for a sour natural gas transmission pipeline, so that the safety valve can be inspected and repaired under the normal production state of sour natural gas, thereby reducing the possibility of sour natural gas spillage and improving the safety of construction when inspecting the safety valve.
[0026] 3. The utility model provides a well site, which adopts the above-mentioned pipeline system, reduces the probability of needing to shut down the well site to inspect and repair the safety valve of the sulfur-containing natural gas transmission pipeline, and reduces the large amount of resource waste caused by the inspection and disassembly of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a schematic diagram of the pipeline structure of the utility model.
[0028] 1-root valve, 2-upstream valve, 3-first bypass valve, 4-safety valve, 5-downstream valve, 6-second bypass valve, 7-main pipeline inlet, 8-main pipeline outlet, 9-venting system inlet, 10-venting pipeline, 11-bypass pipeline. DETAILED DESCRIPTION
[0029] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.
[0030] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the expression terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present utility model.
[0031] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.
[0032] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.
[0033] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.
[0034] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.
[0035] Example 1
[0036] As attached Figure 1 As shown, this embodiment provides a pressure reducing valve group for a sour natural gas transmission pipeline, including a root valve 1, wherein the root valve 1 is arranged in a venting pipeline, and the main pipeline can be respectively connected to the venting pipeline and the bypass pipeline through the root valve 1, and the venting pipeline and the bypass pipeline are both connected to the venting system, an upstream valve 2 is arranged between the root valve 1 and the venting system, a safety valve 4 is arranged between the upstream valve 2 and the venting system, and the upstream valve 2 and the safety valve 4 are both arranged in the venting pipeline, and the bypass pipeline is provided with a first bypass valve 3, and the first bypass valve 3 is arranged between the root valve 1 and the venting system, and closing the root valve 1 can prevent the sour natural gas from entering the venting pipeline and the bypass pipeline from the main pipeline respectively.
[0037] During normal production, the root valve 1 and the upstream valve 2 are in the open state, the first bypass valve 3 and the safety valve 4 are in the closed state, and the sour natural gas flows to the main pipeline outlet 8 through the main pipeline inlet 7. When the pressure in the venting pipeline 10 reaches the set threshold of the safety valve 4, the safety valve 4 automatically opens to discharge the sour natural gas through the venting pipeline 10 to the venting system inlet 9 until the pressure in the venting pipeline 10 is less than the set threshold of the safety valve 4. The safety valve 4 automatically closes to prevent the sour natural gas from moving from the main pipeline to the venting system inlet 9.
[0038] When the safety valve 4 needs to be disassembled or overhauled, the root valve 1 and the upstream valve 2 are first closed to prevent the sour natural gas from moving from the main pipeline inlet 7 to the venting pipeline 10 and the bypass pipeline 11 respectively, and then the first bypass valve 3 is opened to discharge the sour natural gas in the venting pipeline 10 to the venting system inlet 9 through the bypass pipeline 11 until the gas pressure in the venting pipeline 10 is balanced with that in the bypass pipeline 11, and then the upstream valve 2 is closed, and then the safety valve 4 is disassembled or overhauled, which can reduce the probability of sour natural gas escaping and improve the safety of construction.
[0039] By arranging the root valve 1 between the main pipeline and the venting pipeline 10 and between the main pipeline and the bypass pipeline 11, the movement of sour natural gas from the main pipeline to the venting pipeline 10 and the bypass pipeline 11 can be controlled at the same time. When the equipment downstream of the root valve 1 is overhauled, the root valve 1 can be closed to prevent the movement of natural gas from the main pipeline to the venting pipeline 10 and the bypass pipeline 11, thereby reducing the possibility of sour natural gas spilling out and improving the safety of construction. By arranging the upstream valve 2 between the root valve 1 and the safety valve 4, when the root valve 1 is not closed tightly and causes leakage, the upstream valve 2 can timely block the sour natural gas flowing to the venting pipeline 10, thereby improving the reliability of the valve group. By arranging the first bypass valve 3, and opening it when the safety valve 4 is overhauled, the sour natural gas in the venting pipeline 10 between the upstream valve 2 and the root valve 1 is output to the venting system inlet 9 through the bypass pipeline 11, thereby reducing the possibility of sour natural gas leaking through the upstream valve 2 and improving the safety of construction when overhauling the safety valve 4.
[0040] Furthermore, a downstream valve 5 is provided between the safety valve 4 and the venting system inlet 9 .
[0041] During normal production operations, the upstream valve 2 and the downstream valve 5 are in the open state. When the safety valve 4 needs to be inspected and disassembled, the downstream valve 5 is also closed when the upstream valve 2 is closed. By setting the downstream valve 5 and closing the downstream valve 5 when inspecting the safety valve 4, the risk of sour natural gas backflow due to pressure changes in the venting system or other pipeline parts can be reduced, that is, the risk of sour natural gas flowing from the downstream valve 5 to the safety valve 4 is reduced, thereby improving the safety of construction; at the same time, by setting the downstream valve 5 and closing the downstream valve 5 when inspecting the safety valve 4, the probability of different media mixing at the safety valve 4 can be reduced, thereby improving the safety of the valve group.
[0042] Furthermore, a second bypass valve 6 is provided between the first bypass valve 3 and the venting system inlet 9 .
[0043] During normal production operations, the first bypass valve 3 and the second bypass valve 6 are in a closed state. When the safety valve 4 needs to be inspected and disassembled, the second bypass valve 6 is also opened when the first bypass valve 3 is opened. By setting the second bypass valve 6, the gas pressure in the bypass pipeline 11 can be adjusted more accurately and flexibly; at the same time, the probability of different media mixing at the first bypass valve 3 can be reduced, thereby improving the safety of the valve group.
[0044] Furthermore, the trip pressure of the safety valve is set to 9.6 MPa.
[0045] Furthermore, the root valve 1 , the upstream valve 2 , the downstream valve 5 and the first bypass valve 3 are all gate valves.
[0046] By setting the above valve as a gate valve, since the medium through hole inside the gate valve is directly connected to the pipeline, the sour natural gas does not change its flow direction when flowing through, so the flow resistance is small. When opening and closing, the movement direction of the valve plate is perpendicular to the flow direction of the sour natural gas, and the flow resistance of the sour natural gas is also small, which is convenient for operation and improves the convenience and reliability of the valve group.
[0047] Furthermore, those skilled in the art may also configure the root valve 1 as a ball valve.
[0048] Furthermore, the second bypass valve 6 is a stop valve.
[0049] By setting the second bypass valve 6 as a stop valve, the stop valve can provide good sealing performance in the fully closed state, reducing the risk of leakage of sour natural gas, and the stop valve can be designed to withstand higher working pressures, thereby improving the safety of the valve group.
[0050] Example 2
[0051] This embodiment provides a pipeline system, which is provided with a pressure reducing valve group for a sour natural gas transmission pipeline, and can inspect and repair the safety valve 4 under the condition of normal production of sour natural gas, thereby reducing the possibility of sour natural gas spillage and improving the safety of the construction when inspecting the safety valve 4.
[0052] Example 3
[0053] This embodiment provides a well site, which adopts the above-mentioned pipeline system, reduces the probability of needing to shut down the well site to overhaul the safety valve 4 of the sulfur-containing natural gas transmission pipeline, and reduces the large amount of resource waste caused by the overhaul and disassembly of the safety valve 4.
[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A pressure reducing valve group for a sour natural gas transmission pipeline, characterized in that: The invention comprises a root valve (1), wherein the root valve (1) is arranged on a venting pipeline, and a main pipeline can be respectively connected to the venting pipeline and the bypass pipeline through the root valve (1), and the venting pipeline and the bypass pipeline are both connected to a venting system, an upstream valve (2) is arranged between the root valve (1) and the venting system, and a safety valve (4) is arranged between the upstream valve (2) and the venting system, and the upstream valve (2) and the safety valve (4) are both arranged on the venting pipeline, and the bypass pipeline is provided with a first bypass valve (3), and the first bypass valve (3) is arranged between the root valve (1) and the venting system, and closing the root valve (1) can prevent the sour natural gas from entering the venting pipeline and the bypass pipeline from the main pipeline.
2. The pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 1, characterized in that: A downstream valve (5) is also provided between the safety valve (4) and the venting system.
3. The pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 2, characterized in that: A second bypass valve (6) is also provided between the first bypass valve (3) and the venting system.
4. A pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 3, characterized in that: The tripping pressure of the safety valve (4) is between 9.6 MPa and 40 MPa.
5. A pressure reducing valve assembly for a sour natural gas transmission pipeline according to any one of claims 1 to 4, characterized in that: The root valve (1) is a gate valve.
6. The pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 5, characterized in that: The first bypass valve (3) is a gate valve.
7. The pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 2, characterized in that: The upstream valve (2) and the downstream valve (5) are both gate valves.
8. The pressure reducing valve assembly for a sour natural gas transmission pipeline according to claim 3, characterized in that: The second bypass valve (6) is a stop valve.
9. A pipeline system, characterized in that: A pressure reducing valve group for a sour natural gas transmission pipeline is provided as described in any one of claims 1 to 8.
10. A well site, characterized in that: A piping system as claimed in claim 9 is used.