A natural gas production wellhead throttling pressure reducing device

Abstract

The utility model belongs to natural gas exploitation equipment technical field especially is a kind of natural gas exploitation wellhead throttling pressure reducing device, including valve body, gas pipe, deslagging pipe, connecting flange, installation shell, filter cartridge, valve core, fixed screw rod, screw sleeve, adjusting assembly and sealing limiting assembly;The gas pipe is fixedly installed on valve body and is perpendicular to the axis of valve body, the quantity of connecting flange is two and is fixedly installed respectively in the air inlet end of valve body and the one end of gas pipe away from valve body, control valve is provided on the deslagging pipe, and the deslagging pipe is communicated with valve body and is fixedly installed in the bottom of valve body;Sealing limiting assembly is arranged on installation shell, and installation shell is detachably sealed and installed on valve body by sealing limiting assembly and is coaxially arranged with gas pipe.The utility model design is reasonable, and it has the advantages of impurity filtration, accurate throttling, convenient deslagging, reliable sealing function and easy disassembly.

Description

Technical Field

[0001] This utility model relates to the field of natural gas extraction equipment technology, and in particular to a throttling and pressure-reducing device for natural gas extraction wellheads. Background Technology

[0002] During natural gas extraction, the natural gas output from the wellhead typically has a high pressure (up to 10-30 MPa), which needs to be adjusted to a pressure (0.4-4 MPa) suitable for downstream pipelines or equipment before transportation via a throttling and pressure-reducing device. Existing wellhead throttling and pressure-reducing devices have several shortcomings in practical applications: First, natural gas often contains solid impurities (such as sand particles) and droplets, which easily adhere to the surface of throttling components (such as valve cores and valve seats), leading to blockage or wear of the throttling channel, reducing throttling accuracy, and affecting pressure regulation stability. Second, some devices lack efficient slag removal structures; after impurities accumulate, the entire device needs to be disassembled for cleaning, which is cumbersome, results in long downtime, and increases maintenance costs. Third, most devices rely on manual adjustment of the valve core position, making it difficult to respond to wellhead pressure fluctuations in real time, failing to ensure that the outlet pressure remains stable within the set range, and exhibiting poor adaptability.

[0003] Therefore, this utility model proposes a throttling and pressure-reducing device for natural gas extraction wellheads to solve the above problems.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings mentioned in the background art and to propose a throttling and pressure-reducing device for natural gas extraction wellheads.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a natural gas wellhead throttling and pressure reduction device, comprising a valve body, a gas outlet pipe, a slag discharge pipe, a connecting flange, a mounting shell, a filter cylinder, a valve core, a fixing screw, a screw sleeve, an adjusting assembly, and a sealing and limiting assembly;

[0007] The air outlet pipe is fixedly installed on the valve body and perpendicular to the axis of the valve body. There are two connecting flanges, which are respectively fixedly installed at the air inlet end of the valve body and the end of the air outlet pipe away from the valve body. A control valve is provided on the slag discharge pipe, and the slag discharge pipe is connected to the valve body and fixedly installed at the bottom of the valve body.

[0008] The sealing and limiting assembly is mounted on the mounting shell, and the mounting shell is detachably and sealingly mounted on the valve body and coaxially arranged with the air outlet pipe via the sealing and limiting assembly. The filter cartridge is fixedly mounted on one end of the mounting shell near the air outlet pipe and is in movable sealing contact with the inner wall of the valve body. A sealing plate and a partition plate are fixedly mounted inside the mounting shell. The fixing screw is axially slidably mounted on the sealing plate. The valve core is fixedly mounted on one end of the fixing screw and is in movable sealing contact with the inner wall of the air outlet pipe. The threaded sleeve is threadedly mounted on the fixing screw and is rotatably connected to the partition plate. The adjusting assembly is mounted on the partition plate and connected to the threaded sleeve, and is used to drive the threaded sleeve to rotate to adjust the axial position of the fixing screw.

[0009] Preferably, the adjustment assembly includes a servo motor, a worm gear, and a worm wheel. The servo motor is fixedly installed on the side of the partition away from the valve body. The worm gear is axially fixedly installed on the output shaft of the servo motor. The worm wheel is fixedly sleeved on the threaded sleeve, and the worm gear meshes with the worm wheel.

[0010] Preferably, the sealing plate has a sliding hole, the fixing screw passes through the sliding hole, a guide block is fixedly installed on the inner wall of the sliding hole, and a guide opening is provided on the fixing screw, with the guide block and the inner side wall of the guide opening in a sealed sliding contact.

[0011] Preferably, the sealing and limiting assembly includes an installation ring and a sealing ring. An installation port coaxially arranged with the air outlet is provided on one side of the valve body. An annular sealing groove is provided on the valve body with the installation port as the center. An installation ring is fixedly installed on the outer side of the installation shell. A sealing ring is fixedly installed on the side of the installation ring near the valve body and is sealed and engaged in the annular sealing groove. The installation ring is installed on the valve body by bolts.

[0012] Preferably, the filter cartridge is made of a corrosion-resistant alloy material, and the surface of the filter cartridge is uniformly distributed with micron-sized filter pores.

[0013] Preferably, the end of the valve core has a tapered structure and forms an annular throttling channel with the inner wall of the air outlet pipe.

[0014] Preferably, the sealing ring is made of fluororubber and has a trapezoidal cross-section.

[0015] Preferably, the middle section of the valve body is arranged in a horizontal hollow cylindrical shape, the inner wall of the valve body near the slag discharge pipe is set in a reduced diameter manner, and the feed inlet of the slag discharge pipe is located at the lowest point of the bottom inner wall of the valve body.

[0016] Preferably, an annular groove is provided on the inner wall of the valve body near the air outlet pipe, and the filter cartridge is snapped into the annular groove on the side away from the mounting shell.

[0017] Preferably, multiple pressure sensors for real-time monitoring of natural gas pressure are fixedly installed on the side of the sealing plate near the valve core, and the servo motor and multiple pressure sensors are all connected to an external control system via wires.

[0018] The beneficial effects of this utility model are:

[0019] This invention achieves efficient throttling and pressure reduction at the natural gas wellhead by incorporating a valve body, gas outlet pipe, slag discharge pipe, mounting shell, filter cartridge, valve core, fixing screw, screw sleeve, adjusting assembly, and sealing limit assembly. The filter cartridge effectively intercepts solid impurities and droplets in the natural gas, preventing them from affecting the throttling accuracy. The adjusting assembly allows for adjustment of the valve core position as needed, changing the cross-sectional area of ​​the annular throttling channel formed by the valve core and the inner wall of the gas outlet pipe, thereby precisely regulating the natural gas pressure. The pressure sensor monitors the pressure signal in real time and feeds it back to the external control system, working in conjunction with the adjusting assembly to automatically adjust the valve core position, ensuring the pressure remains stable within the set range.

[0020] The sealing and limiting components effectively ensure the sealing of the connection between the mounting shell and the valve body, while also facilitating disassembly and assembly. In addition, the horizontal hollow cylindrical design in the middle section of the valve body and the bottom diameter reduction structure facilitate the installation and positioning of the filter cartridge and the collection of impurities to the slag discharge pipe for discharge.

[0021] This utility model has a reasonable overall structural design, is easy to operate, has high throttling accuracy, good sealing performance, and long service life, and can effectively meet the throttling and pressure reduction requirements of natural gas wellheads. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of a natural gas wellhead throttling and pressure-reducing device proposed in this utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0025] Figure 3 for Figure 2 Front view structural diagram;

[0026] Figure 4 This is a partial three-dimensional structural schematic diagram of the present invention;

[0027] Figure 5 This is a schematic diagram of the valve core, fixing screw, screw sleeve and adjusting assembly components proposed in this utility model;

[0028] Figure 6 This is a cross-sectional structural diagram of the valve body portion proposed in this utility model.

[0029] In the diagram: 1. Valve body; 11. Air outlet pipe; 12. Connecting flange; 13. Slag discharge pipe; 2. Mounting shell; 201. Mounting ring; 202. Sealing ring; 21. Filter cartridge; 22. Sealing plate; 23. Partition plate; 3. Valve core; 31. Fixing screw; 311. Guide block; 32. Screw sleeve; 33. Servo motor; 34. Worm gear; 35. Worm wheel; 4. Pressure sensor. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] Reference Figure 1-6 A natural gas wellhead throttling and pressure reduction device includes a valve body 1, a gas outlet pipe 11, a slag discharge pipe 13, a mounting shell 2, a filter cartridge 21, a valve core 3, a connecting flange 12, a fixing screw 31, and a screw sleeve 32.

[0032] The air outlet pipe 11 is fixedly installed on the valve body 1 and perpendicular to the axis of the valve body 1. Two connecting flanges 12 are fixedly installed at the air inlet end of the valve body 1 and the end of the air outlet pipe 11 furthest from the valve body 1, respectively. A control valve is installed on the slag discharge pipe 13, which is connected to the valve body 1 and fixedly installed at the bottom of the valve body 1. To facilitate the installation and positioning of the filter cartridge 21, and to allow the filtered impurities to move automatically to the feed inlet of the slag discharge pipe 13, the middle section of the valve body 1 is arranged in a horizontally hollow cylindrical shape. The inner wall of the valve body 1 near the slag discharge pipe 13 is designed with a reduced diameter, and the inlet of the slag discharge pipe 13 is located at the lowest point of the inner wall of the bottom of the valve body 1. In order to provide support for the filter cartridge 21 and further enhance the sealing performance between the filter cartridge 21 and the inner wall of the valve body 1, and to prevent unfiltered natural gas from flowing directly into the gas outlet pipe 11 from the edge gap of the filter cartridge 21, an annular groove is provided on the inner wall of the valve body 1 near the gas outlet pipe 11. The filter cartridge 21 is snapped into the annular groove on the side away from the mounting shell 2.

[0033] A mounting port coaxially aligned with the gas outlet pipe 11 is provided on one side of the valve body 1. An annular sealing groove is provided on the valve body 1 with the mounting port as the center. A mounting ring 201 is fixedly installed on the outer side of the mounting shell 2. A sealing ring 202 is fixedly installed on the side of the mounting ring 201 near the valve body 1 and is sealed and snapped into the annular sealing groove. The mounting ring 201 is installed on the valve body 1 by bolts, which facilitates the disassembly and assembly of the mounting shell 2 and ensures the sealing effect when the mounting shell 2 is installed on the valve body 1. The sealing ring 202 is made of fluororubber and has a trapezoidal cross-section, which has good elasticity and aging resistance. It can also fit tightly against the inner wall of the annular sealing groove, thereby effectively preventing natural gas from leaking from the connection between the mounting shell 2 and the valve body 1.

[0034] The filter cartridge 21 is fixedly installed on the end of the mounting housing 2 near the outlet pipe 11 and makes movable sealing contact with the inner wall of the valve body 1. To effectively intercept solid impurities and droplets in the natural gas and prevent impurities from entering the valve core 3 area and affecting the throttling accuracy, the filter cartridge 21 is made of corrosion-resistant alloy material, such as Hastelloy, Monel alloy, or double-sided stainless steel. The surface of the filter cartridge 21 has uniformly distributed micron-level filter pores. A sealing plate 22 and a partition plate 23 are fixedly installed inside the mounting housing 2. A fixing screw 31 is axially slidably installed on the sealing plate 22. The valve core 3 is fixed... The screw sleeve 32 is fixedly installed at one end of the fixed screw 31 and is in movable sealing contact with the inner wall of the air outlet pipe 11. The screw sleeve 32 is threadedly installed on the fixed screw 31 and is rotatably connected to the partition plate 23. The servo motor 33 is fixedly installed on the side of the partition plate 23 away from the valve body 1. The worm gear 34 is axially fixedly installed on the output shaft of the servo motor 33. The worm gear 34 is fixedly sleeved on the screw sleeve 32 and the worm gear 35 meshes with the worm gear 35. The screw sleeve 32 can be controlled to rotate as needed, so that the position of the valve core 3 can be adjusted with the cooperation of the fixed screw 31.

[0035] In this embodiment, in order to ensure that the fixing screw 31 does not rotate, so that the position of the valve body 1 can be adjusted when the screw sleeve 32 rotates, a sliding hole is provided on the sealing plate 22, the fixing screw 31 passes through the sliding hole, a guide block 311 is fixedly installed on the inner wall of the sliding hole, a guide opening is provided on the fixing screw 31, and the guide block 311 and the inner side wall of the guide opening are in sealed sliding contact.

[0036] In this embodiment, the end of the valve core 3 is tapered and forms an annular throttling channel with the inner wall of the gas outlet pipe 11. That is, when the fixed screw 31 drives the valve core 3 to move axially, the cross-sectional area of ​​the annular channel changes, thereby achieving precise regulation of the natural gas pressure.

[0037] In this embodiment, a plurality of pressure sensors 4 for real-time monitoring of natural gas pressure are fixedly installed on the side of the sealing plate 22 near the valve core 3. The servo motor 33 and the plurality of pressure sensors 4 are connected to an external control system through wires, which can receive the real-time pressure signal fed back by the pressure sensors 4, realize the automatic adjustment of the position of the valve core 3, and ensure that the pressure of natural gas is stable within the set range during the throttling and pressure reduction process.

[0038] The threaded connection between the screw sleeve 32 and the fixed screw 31 is based on the state setting of the threaded sealing connection disclosed in the existing known technology, which can prevent natural gas from overflowing back to the servo motor 33 side. At the same time, the selection of the servo motor 33 should meet the basic explosion-proof requirements.

[0039] The circuits, electronic components, and module mechanisms involved all employ existing technologies, which can be fully implemented by those skilled in the art, and need no further explanation. The content protected by this application does not involve any improvement to the software, circuits, or methods.

[0040] Working principle: When in use, first connect the gas inlet end of the valve body 1 to the gas pipeline of the natural gas wellhead through the connecting flange 12, and connect the end of the gas outlet pipe 11 to the downstream gas-using equipment or transmission pipeline, and ensure the sealing performance of each connection part. Then open the control valve on the slag discharge pipe 13, check whether the slag discharge channel is unobstructed, and then close the control valve.

[0041] Then, the power supply to the servo motor 33 and pressure sensor 4 is turned on, and the external control system enters the standby state. When natural gas enters from the inlet end of the valve body 1, it first flows through the horizontal hollow cylindrical area in the middle section of the valve body 1 and flows towards the filter cartridge 21. When the natural gas passes through the micron-level filter holes on the surface of the filter cartridge 21, the solid impurities and liquid droplets are intercepted on the outside of the filter cartridge 21. The filtered natural gas enters the interior of the filter cartridge 21 and flows to the outlet pipe 11. At this time, the pressure sensor 4 monitors the natural gas pressure at the front end of the valve core 3 in real time and transmits the signal to the external control system. The control system drives the servo motor 33 to operate according to the set target pressure value. The output shaft of the servo motor 33 drives the worm gear 34 to rotate. The worm gear 34 meshes with the worm wheel 35 to drive the screw sleeve 32 to rotate on the partition plate 23. Since the fixed screw 31 is limited by the guide block 311 and the sliding hole on the sealing plate 22, it cannot rotate with the screw sleeve 32. Therefore, the rotation of the screw sleeve 32 is converted into the axial movement of the fixed screw 31, which in turn drives the valve core 3 to move along the axis of the outlet pipe 11.

[0042] When the valve core 3 moves away from the gas inlet direction of the gas outlet pipe 11, the cross-sectional area of ​​the annular throttling channel formed by the conical end of the valve core 3 and the inner wall of the gas outlet pipe 11 increases, the natural gas flow resistance decreases, and the pressure drop decreases. Conversely, when the valve core 3 moves closer to the gas inlet direction of the gas outlet pipe 11, the cross-sectional area of ​​the annular channel decreases, the flow resistance increases, and the pressure drop increases, thereby achieving precise regulation of natural gas pressure.

[0043] During long-term use, impurities trapped on the outside of the filter cartridge 21 gradually accumulate. The control valve on the slag discharge pipe 13 can be opened periodically, and under the guidance of the narrowed inner wall, the impurities will be discharged from the slag discharge pipe 13 at the bottom of the valve body 1, thus preventing impurities from clogging and affecting the normal operation of the device. If the filter cartridge 21 or valve core 3 needs to be maintained or replaced, the bolts on the mounting ring 201 can be unscrewed, and the mounting shell 2, along with the filter cartridge 21, valve core 3, and other components, can be removed from the valve body 1. After the maintenance is completed, the mounting ring 201 can be fixed to the valve body 1 by the locking engagement of the sealing ring 202 with the annular sealing groove and bolts to restore the device to use.

[0044] The above provides a detailed description of a natural gas wellhead throttling and pressure-reducing device provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A natural gas wellhead throttling and pressure-reducing device, characterized in that, Includes valve body (1), air outlet pipe (11), slag discharge pipe (13), mounting shell (2), filter cartridge (21), connecting flange (12), valve core (3), fixing screw (31), screw sleeve (32), adjustment assembly and sealing limit assembly; The air outlet pipe (11) is fixedly installed on the valve body (1) and perpendicular to the axis of the valve body (1). There are two connecting flanges (12), which are respectively fixedly installed at the air inlet end of the valve body (1) and the end of the air outlet pipe (11) away from the valve body (1). A control valve is provided on the slag discharge pipe (13), and the slag discharge pipe (13) is connected to the valve body (1) and fixedly installed at the bottom of the valve body (1). The sealing and limiting assembly is set on the mounting shell (2), and the mounting shell (2) is detachably and sealed on the valve body (1) and coaxially arranged with the air outlet pipe (11) through the sealing and limiting assembly. The filter cartridge (21) is fixedly installed on one end of the mounting shell (2) near the air outlet pipe (11) and is in movable sealing contact with the inner wall of the valve body (1). The mounting shell (2) is fixedly installed with a sealing plate (22) and a partition plate (23). The fixing screw (31) is axially slidably installed on the sealing plate (22). The valve core (3) is fixedly installed on one end of the fixing screw (31) and is in movable sealing contact with the inner wall of the air outlet pipe (11). The screw sleeve (32) is threadedly installed on the fixing screw (31) and rotatably connected to the partition plate (23). The adjusting assembly is set on the partition plate (23) and connected to the screw sleeve (32) for driving the screw sleeve (32) to rotate to adjust the axial position of the fixing screw (31).

2. The natural gas wellhead throttling and pressure reduction device according to claim 1, characterized in that: The adjustment assembly includes a servo motor (33), a worm (34) and a worm wheel (35). The servo motor (33) is fixedly installed on the side of the partition (23) away from the valve body (1). The worm (34) is axially fixedly installed on the output shaft of the servo motor (33). The worm wheel (35) is fixedly sleeved on the screw sleeve (32), and the worm (34) meshes with the worm wheel (35).

3. The natural gas wellhead throttling and pressure reduction device according to claim 1, characterized in that: The sealing plate (22) has a sliding hole, the fixing screw (31) passes through the sliding hole, and a guide block (311) is fixedly installed on the inner wall of the sliding hole. The fixing screw (31) has a guide opening, and the guide block (311) and the inner wall of the guide opening are in sealed sliding contact.

4. The natural gas wellhead throttling and pressure reduction device according to claim 1, characterized in that: The sealing and limiting assembly includes an installation ring (201) and a sealing ring (202). A mounting port coaxially arranged with the air outlet pipe (11) is provided on one side of the valve body (1). An annular sealing groove is provided on the valve body (1) with the installation port as the center. An installation ring (201) is fixedly installed on the outside of the mounting shell (2). A sealing ring (202) is fixedly installed on the side of the installation ring (201) near the valve body (1) and is sealed and snapped into the annular sealing groove. The installation ring (201) is installed on the valve body (1) by bolts.

5. A natural gas wellhead throttling and pressure-reducing device according to claim 1, characterized in that: The filter cartridge (21) is made of corrosion-resistant alloy material, and micron-sized filter pores are evenly distributed on the surface of the filter cartridge (21).

6. The natural gas wellhead throttling and pressure reduction device according to claim 1, characterized in that: The end of the valve core (3) is tapered and forms an annular throttling channel with the inner wall of the air outlet pipe (11).

7. A natural gas wellhead throttling and pressure-reducing device according to claim 4, characterized in that: The sealing ring (202) is made of fluororubber and has a trapezoidal cross-section.

8. A natural gas wellhead throttling and pressure-reducing device according to claim 1, characterized in that: The middle section of the valve body (1) is arranged in a horizontal hollow cylindrical shape. The inner wall of the valve body (1) near the slag discharge pipe (13) is set in a reduced diameter manner, and the feed inlet of the slag discharge pipe (13) is located at the lowest point of the bottom inner wall of the valve body (1).

9. A natural gas wellhead throttling and pressure-reducing device according to claim 1, characterized in that: The valve body (1) has an annular groove on the inner wall of the side near the air outlet pipe (11), and the filter cartridge (21) is snapped into the annular groove on the side away from the mounting shell (2).

10. A natural gas wellhead throttling and pressure-reducing device according to claim 2, characterized in that: The sealing plate (22) is fixedly installed with multiple pressure sensors (4) for real-time monitoring of natural gas pressure on the side near the valve core (3), and the servo motor (33) and multiple pressure sensors (4) are connected to the external control system through wires.

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