Shale gas work area wellhead pressure monitoring mechanism

Abstract

The utility model relates to the technical field of natural gas extraction, in particular to a shale gas work area wellhead pressure monitoring mechanism which comprises a first switch valve, a three-way connector, a check valve and a second switch valve which are sequentially connected, the three-way connector is connected with a pressure transmitter, and the first switch valve is connected with an intermediate casing of a gas extraction tree through a first pressure guide pipe. And the second switch valve is communicated with a gas output pipe of the gas production tree through a second pressure guide pipe. A pipeline is established from a technical casing of a gas production tree to a gas production output pipe of the gas production tree, and a wellhead pressure transmitter is led to the ground in one step, so that the real-time performance, integrity and accuracy of data acquisition can be realized, scattered gas can be directly output from the gas production output pipe of the gas production tree when the technical casing is boosted, and the gas production efficiency of the gas production tree is improved. Effective recovery of scattered gas is achieved, environmental pollution is avoided, the technical improvement frequency of a gas production tree in the gas production process is reduced, pipeline laying and maintenance cost is reduced, the service life of equipment is prolonged, and economic benefits are improved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas extraction technology, specifically to a wellhead pressure monitoring device for shale gas production areas. Background Technology

[0002] The wellhead is a key piece of equipment in the gas field development process. It is mainly installed at the wellhead and is used to control and regulate the extraction and transportation of natural gas. The pressure transmitter is a commonly used pressure monitoring device on the wellhead. The continuous and accurate monitoring of the pressure transmitter plays a vital role in the normal production of the gas well. Currently, due to safety, environmental protection, and process operation requirements, the wellhead in existing shale gas fields needs to be set up in a square well pool. The pressure transmitter on the wellhead is also set up in the square well pool. However, the square well pool is prone to water accumulation, especially during the flood season. If the rainwater in the square well pool is not drained in time, the wellhead pressure transmitter will be immersed in water for a long time. When the sealing end of the wellhead pressure transmitter is not tight, rainwater can easily seep into its interior, causing corrosion and damage to the pressure transmitter, shortening its service life, increasing operating costs, and easily leading to data loss, affecting the accuracy and timeliness of data acquisition.

[0003] To overcome the risk of flooding, existing technologies employ a modification to connect the oil pipe to the pressure guide pipe at the surface for pressure tapping. However, the pressure transmitter is placed against the square well pool, which affects the establishment of well site standardization. Furthermore, the long vertical placement of the pressure guide pipe leads to discrepancies between the sampling results and the actual results. In addition, when the gas is pressurized, the pipeline needs to be reinstalled to release scattered gas. This results in the existing gas production tree in the square well pool requiring multiple modifications during the gas production process, leading to high modification costs and construction safety risks. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the need for multiple technical modifications during the production process of existing gas production trees located in square well pools, which result in high costs and construction safety risks. This invention provides a wellhead pressure monitoring mechanism for shale gas production areas.

[0005] This utility model provides a shale gas wellhead pressure monitoring mechanism, including a first switching valve, a three-way connector, a check valve and a second switching valve connected in sequence. The three-way connector is connected to a pressure transmitter. The first switching valve is connected to the technical casing of the gas production tree through a first pressure guide pipe. The second switching valve is connected to the gas production output pipe of the gas production tree through a second pressure guide pipe.

[0006] This utility model discloses a wellhead pressure monitoring mechanism for shale gas production areas. By establishing a pressure monitoring pipeline with a pressure transmitter connecting the technical casing of the gas production tree and the gas output pipe of the gas production tree located above ground, the wellhead pressure transmitter is brought to the surface in one step. This not only enables real-time, complete, and accurate data acquisition, but also allows for the direct output of scattered gas from the gas output pipe of the gas production tree during casing pressurization, achieving effective recovery of scattered gas, avoiding environmental pollution, reducing the number of technical modifications to the gas production tree during the gas production process, lowering pipeline laying and maintenance costs, extending equipment service life, and improving economic benefits.

[0007] Preferably, a flow meter is installed between the second switching valve and the gas output pipe. This allows for monitoring and statistical analysis of the amount of recovered scattered gas, providing data support for precise, data-driven management of gas well production.

[0008] Preferably, the first switching valve and the three-way connector are coaxially and horizontally arranged, while the pressure transmitter, the check valve, and the second switching valve are coaxially and vertically arranged. The second pressure guide pipe includes a short steel pipe section, which is welded to the gas production output pipe of the gas production tree. The vertically arranged pressure transmitter, check valve, and second switching valve have sufficient support strength under the connection of conventional short steel pipe sections, reducing the need for supports and lowering technical modification costs.

[0009] Preferably, the first pressure guiding pipe comprises a seamless steel pipe, one end of which is detachably connected to the technical casing of the gas sampling tree, and the other end is detachably connected to the first switching valve. Seamless steel pipes are smaller in size than conventional short-section steel pipes and can meet the requirements for the recovery and transportation of scattered gas and the testing needs of pressure transmitters.

[0010] Preferably, along the airflow output direction, the first pressure-conducting pipe includes a first horizontal section, a vertical section, and a second horizontal section. The first horizontal section and the vertical section are connected by a first arc-shaped transition section, and the vertical section and the second horizontal section are connected by a second arc-shaped transition section. The first switching valve is disposed in the second horizontal section. The first and second arc-shaped transition sections allow the airflow to smoothly change direction, reducing the impact of sudden changes in direction on pressure and enabling the pressure transmitter to measure accurate pressure values.

[0011] Preferably, the vertical section is provided with at least two limiting fasteners, which are detachably connected to the wall of the square well pool. This ensures the stability of the first pressure guide pipe, allows for installation in a uniform position within different square well pools, facilitates the standardization of the well site, and reduces vibration during use, thereby minimizing the impact on the detection results.

[0012] Preferably, the first pressure-conducting pipe is provided with a heat insulation layer, which at least covers the vertical section and the second horizontal section, and the limiting fastener is secured to the heat insulation layer. The heat insulation layer provides thermal insulation for the first pressure-conducting pipe, preventing ice blockage from forming on it.

[0013] Preferably, the insulation layer includes a heat insulation layer and a waterproof layer, with the waterproof layer disposed on the heat insulation layer. This improves the heat insulation effect of the insulation layer.

[0014] Preferably, the first horizontal section is provided with a slag discharge pipe, which is connected to an adapter, and the adapter is equipped with a sealing element. The slag discharge pipe can remove impurities in the first horizontal section that are not transported upwards along the first pressure-conducting pipe, thus avoiding adverse effects of impurities on the detection results and the pressure transmitter.

[0015] Preferably, the slag discharge pipe connects the first horizontal section and the first arc-shaped transition section. This location is prone to impurity accumulation due to airflow deflection, and slag discharge from this point allows for better cleaning of the first pressure-conducting pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model provides a shale gas wellhead pressure monitoring mechanism. By establishing a pressure monitoring pipeline with a pressure transmitter that connects the technical casing of the gas production tree and the gas production output pipe of the gas production tree located above the ground, the wellhead pressure transmitter can be brought to the ground in one step, which can achieve real-time, complete and accurate data acquisition.

[0018] 2. This utility model provides a shale gas wellhead pressure monitoring mechanism. By establishing a pipeline from the technical casing of the gas production tree to the gas production output pipe of the gas production tree, it is possible to output scattered gas directly from the gas production output pipe of the gas production tree when the technical casing is pressurized, thereby achieving effective recovery of scattered gas and avoiding environmental pollution.

[0019] 3. This utility model provides a shale gas wellhead pressure monitoring mechanism. By establishing a pipeline from the technical casing of the gas production tree to the gas production output pipe of the gas production tree, it can reduce the number of technical modifications to the gas production tree during the gas production process, reduce pipeline laying and maintenance costs, extend equipment service life, and improve economic benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a shale gas wellhead pressure monitoring mechanism in Example 1. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the structure of a shale gas wellhead pressure monitoring mechanism in Example 1. Figure 2 .

[0022] Figure 3 This is the usage status of a shale gas wellhead pressure monitoring device in Example 1. Figure 1 .

[0023] Figure 4 This is the usage status of a shale gas wellhead pressure monitoring device in Example 1. Figure 2 .

[0024] Marked in the image:

[0025] 1-First switching valve, 2-T-connector, 3-Check valve, 4-Second switching valve, 5-Pressure transmitter, 6-First pressure guide pipe, 61-First horizontal section, 62-Vertical section, 63-Second horizontal section, 64-First arc transition section, 65-Second arc transition section, 66-Slag discharge pipe, 67-Adapter, 68-Sealing component, 7-Second pressure guide pipe, 8-Gas production tree, 81-Technical casing, 82-Gas production output pipe, 9-Flow meter, 10-Limit fastener, 20-Square well pool, 30-Insulation layer. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0027] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] Example 1

[0033] like Figure 1 , Figure 3 As shown, a shale gas wellhead pressure monitoring mechanism includes a first switching valve 1, a three-way connector 2, a check valve 3, and a second switching valve 4 connected in sequence. The three-way connector 2 is connected to a pressure transmitter 5. The first switching valve 1 is connected to the technical casing 81 of the gas production tree 8 through a first pressure guide pipe 6. The second switching valve 4 is connected to the gas production output pipe 82 of the gas production tree 8 through a second pressure guide pipe 7.

[0034] The technical casing 81, the first switching valve 1, the tee joint 2, the check valve 3, the second switching valve 4, and the gas output pipe 82 located on the ground form a stable pressure transmission channel, enabling the pressure transmitter 5 to detect the pressure signal drawn from the threaded flange positions on both sides of the technical casing 81. The pressure transmitter 5 is located above the ground and is not affected by water flooding in the square well pool 20. The first switching valve 1 and the second switching valve 4 are used to control the on / off state of the pressure monitoring mechanism pipeline between the technical casing 81 and the gas output pipe 82 of the gas production tree 8. The tee joint 2 is used to connect the first switching valve 1, the check valve 3, and the pressure transmitter 5. The check valve 3 is used to prevent the backflow of normal output gas in the gas output pipe 82 and ensure unidirectional transmission of pressure signals.

[0035] In an optional embodiment, the first switching valve 1 and the three-way connector 2 are arranged horizontally and coaxially, while the pressure transmitter 5, check valve 3, and second switching valve 4 are arranged vertically and coaxially. The second pressure guide pipe 7 includes a short steel pipe section, which is welded to the gas output pipe 82 of the gas production tree 8. The short steel pipe section can be a welded steel pipe with end threads, which can be threaded to the second switching valve 4. The pressure transmitter 5, check valve 3, and second switching valve 4 are connected by a double-threaded pipe joint, so that the vertically connected pressure transmitter 5, check valve 3, and second switching valve 4 have sufficient support strength, and the stability of the structure can be met without the need for additional supports. This reduces the need for raw materials, structural components, and corresponding labor time required for technical modifications, thereby reducing technical modification costs.

[0036] In an optional embodiment, the first switching valve 1 can be a right-angle type, which can directly realize the turning of the first pressure guide pipe 6 from vertical to horizontal, and the second switching valve 4 can be a straight-through type, which can realize the stable connection and support of each structure in the vertical direction.

[0037] In an optional embodiment, the first pressure guiding pipe 6 may include a seamless steel pipe. One end of the first pressure guiding pipe 6 is connected to the technical sleeve 81 of the gas sampling tree 8 by a threaded joint, and the other end is connected to the first switch valve 1 by a threaded joint. The seamless steel pipe may be φ3 / 8, which is smaller than the size of the conventional short steel pipe used for conversion. The use of a seamless steel pipe for the first pressure guiding pipe 6 can reduce the overall cost of the pressure monitoring mechanism and reduce the technical modification cost while meeting the requirements of scattered gas recovery and transportation and pressure transmitter 5 detection.

[0038] In an optional embodiment, along the airflow output direction, the first pressure guide pipe 6 includes a first horizontal section 61, a vertical section 62, and a second horizontal section 63. The first horizontal section 61 and the vertical section 62 are connected by a first arc-shaped transition section 64, and the vertical section 62 and the second horizontal section 63 are connected by a second arc-shaped transition section 65. The first switching valve 1 is located in the second horizontal section 63. In use, the airflow output horizontally from the sleeve can smoothly transition to vertical conveying along the first arc-shaped transition section 64, and then turn to horizontal conveying via the second arc-shaped transition section 65. This helps reduce airflow resistance. The first arc-shaped transition section 64 and the second arc-shaped transition section 65 allow the airflow to smoothly change direction, reducing the impact of sudden changes in direction on pressure, and enabling the pressure transmitter 5 to measure accurate pressure values.

[0039] In one or more implementations, such as Figure 2 As shown, a flow meter 9 can also be installed between the second switching valve 4 and the gas output pipe 82. The flow meter 9 measures the amount of gas recovered from the pressure monitoring mechanism, providing data support for the data-driven and precise management of gas well production.

[0040] In one or more embodiments, the vertical section 62 is provided with at least two limiting fasteners 10. The limiting fasteners 10 are bolted to the pool wall of the square well pool 20, so that the first pressure guiding pipe 6 is set stably, which can meet the requirement of uniform installation in different square well pools 20, meet the standardization of well site establishment, and can limit the first pressure guiding pipe 6 through the limiting fasteners 10 during use, and has a vibration reduction effect, which can reduce the impact of possible vibration on the test results.

[0041] In one or more implementations, such as Figure 4 As shown, the first pressure-conducting pipe 6 may also be provided with a heat insulation layer 30, which at least covers the vertical section 62 and the second horizontal section 63, and the limiting fastener 10 is held in place by the heat insulation layer 30. The heat insulation layer 30 provides heat insulation for the first pressure-conducting pipe 6, preventing ice blockage from forming on the first pressure-conducting pipe 6.

[0042] In an optional embodiment, the insulation layer 30 includes a heat insulation layer and a waterproof layer, with the waterproof layer disposed on top of the heat insulation layer. This can improve the heat insulation effect of the insulation layer 30.

[0043] In optional embodiments, the heat insulation layer may be a cotton layer, a foaming agent layer, or other material structural components with heat insulation effect, and the waterproof layer may be a waterproof material layer such as tin foil or aluminum foil wrapped around the heat insulation layer.

[0044] In one or more implementations, such as Figure 4 As shown, the first horizontal section 61 may also be provided with a slag discharge pipe 66, which is connected to an adapter 67, and the adapter 67 is equipped with a sealing component 68.

[0045] In an optional embodiment, the slag discharge pipe 66 can be connected to a conventional gas storage tank via an adapter 67. The conventional gas storage tank is used to perform internal cleaning and unblocking operations on the pressure monitoring mechanism along the slag discharge pipe 66. When the slag discharge pipe 66 is not in use, it is blocked by a sealing member 68. The slag discharge pipe 66 can remove impurities in the first horizontal section 61 that have not been transported upward along the first pressure guide pipe 6, thus avoiding the adverse effects of impurities on the detection results and the pressure transmitter 5.

[0046] In an optional embodiment, the slag discharge pipe 66 can be connected between the first horizontal section 61 and the first arc-shaped transition section 64, that is, located in front of the starting point of the first arc-shaped transition section 64. This location is prone to impurity accumulation due to the change of airflow. Discharging slag from this location can make the first pressure guide pipe 6 cleaner.

[0047] This embodiment of a shale gas wellhead pressure monitoring mechanism allows for the establishment of a pressure monitoring channel between the technical casing 81 and the pressure transmitter 5 via the first pressure guide pipe 6 during normal production processes by closing the second switch valve 4. When the first switch valve 1 and the second switch valve 4 are opened, the technical casing 81 and the gas production output pipe 82 are connected, and the gas flow is transported along the technical casing 81 to the gas production output pipe 82, achieving accurate pressure detection and recovering scattered gas output from the technical casing 81, avoiding the need to separately establish a venting pipeline. When the first switch valve 1 and the second switch valve 4 are closed simultaneously, maintenance and repair of the pressure transmitter 5 can be performed, avoiding adverse effects on the production process caused by replacing the pressure transmitter 5.

[0048] This embodiment of a shale gas wellhead pressure monitoring mechanism establishes a pressure monitoring pipeline with a pressure transmitter 5 connecting the technical casing 81 of the gas production tree 8 and the gas production output pipe 82 of the gas production tree 8 located above ground. This allows the wellhead pressure transmitter 5 to be brought to the surface in one step, which not only enables real-time, complete, and accurate data acquisition, but also allows scattered gas to be directly output from the gas production output pipe 82 of the gas production tree 8 during casing pressurization, achieving effective recovery of scattered gas, avoiding environmental pollution, reducing the number of technical modifications to the gas production tree 8 during the gas production process, reducing pipeline laying and maintenance costs, extending equipment service life, and improving economic benefits.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wellhead pressure monitoring mechanism for shale gas production areas, characterized in that, The system includes a first switching valve (1), a three-way connector (2), a check valve (3), and a second switching valve (4) connected in sequence. The three-way connector (2) is connected to a pressure transmitter (5). The first switching valve (1) is connected to the technical sleeve (81) of the gas production tree (8) through a first pressure guide pipe (6). The second switching valve (4) is connected to the gas production output pipe (82) of the gas production tree (8) through a second pressure guide pipe (7).

2. The shale gas wellhead pressure monitoring mechanism according to claim 1, characterized in that, A flow meter (9) is provided between the second switching valve (4) and the gas output pipe (82).

3. A shale gas wellhead pressure monitoring mechanism according to claim 2, characterized in that, The first switching valve (1) and the three-way connector (2) are arranged horizontally on the same axis. The pressure transmitter (5), the check valve (3) and the second switching valve (4) are arranged vertically on the same axis. The second pressure guide pipe (7) includes a short section steel pipe, which is welded to the gas output pipe (82) of the gas production tree (8).

4. A shale gas wellhead pressure monitoring mechanism according to claim 3, characterized in that, The first pressure guide pipe (6) includes a seamless steel pipe. One end of the first pressure guide pipe (6) is detachably connected to the technical casing (81) of the gas production tree (8), and the other end is detachably connected to the first switch valve (1).

5. A shale gas wellhead pressure monitoring mechanism according to claim 4, characterized in that, Along the airflow output direction, the first pressure guide pipe (6) includes a first horizontal section (61), a vertical section (62), and a second horizontal section (63). The first horizontal section (61) and the vertical section (62) are connected by a first arc-shaped transition section (64), and the vertical section (62) and the second horizontal section (63) are connected by a second arc-shaped transition section (65). The first switching valve (1) is located in the second horizontal section (63).

6. A shale gas wellhead pressure monitoring mechanism according to claim 5, characterized in that, The vertical section (62) is provided with at least two limiting fasteners (10), which are detachably connected to the pool wall of the square well pool (20).

7. A shale gas wellhead pressure monitoring mechanism according to claim 6, characterized in that, The first pressure guide tube (6) is provided with a heat insulation layer (30), which covers at least the vertical section (62) and the second horizontal section (63), and the limiting fastener (10) is held on the heat insulation layer (30).

8. A shale gas wellhead pressure monitoring mechanism according to claim 7, characterized in that, The insulation layer (30) includes a heat insulation layer and a waterproof layer, with the waterproof layer disposed on the heat insulation layer.

9. A shale gas wellhead pressure monitoring device according to any one of claims 5-8, characterized in that, The first horizontal section (61) is provided with a slag discharge pipe (66), which is connected to an adapter (67), and the adapter (67) is equipped with a sealing element (68).

10. A shale gas wellhead pressure monitoring mechanism according to claim 9, characterized in that, The slag discharge pipe (66) connects the first horizontal section (61) and the first arc-shaped transition section (64).

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