CN215927733U - Plunger and well head gas production system - Google Patents

Abstract

The application discloses a plunger and a wellhead gas production system, wherein an axially extending long hole is formed in the plunger, a first liquid inlet channel communicated with the long hole is formed in one end of the plunger, and an atomizing channel communicated with the long hole is radially formed in the plunger; a plugging piece is arranged in the long hole and is in sliding sealing fit with the inner wall of the long hole; the blocking piece is configured to be capable of moving from the balance state to the atomization state under the action of pressure, so that the liquid in the long hole is sprayed out of the atomization channel. The utility model provides a plunger during operation in the well, can be in the pressure effect down the up-and-down motion of well in order to discharge ponding in the well, the ponding of plunger below can get into the plunger top through atomizing channel to the well head is released by the plunger, has improved the drainage work efficiency of plunger.

Description

Plunger and well head gas production system

Technical Field

The application relates to the technical field of oil and gas exploitation, in particular to a plunger and a wellhead gas production system.

Background

In the production process of a natural gas well, formation water is produced frequently, the gas production rate is reduced gradually along with the continuous reduction of formation pressure, and when the gas production rate is lower than the critical liquid carrying flow rate of the gas well, gas cannot carry all produced water out of a shaft, so that shaft effusion is caused, and the normal production of the gas well is influenced.

In order to solve the problems of low gas well yield and difficult liquid carrying, a plunger gas lift drainage gas production process is adopted in the gas field in sequence to improve the production efficiency, improve the gas well yield and avoid ineffective consumption of gas. The plunger gas lift realizes drainage by using a plunger which freely moves in the well, and the plunger is lifted under the pressure action in the well, so that accumulated water in the well is pushed out of the well.

However, the existing plunger can only push accumulated water above the plunger out of the well, more accumulated water still remains below the plunger, and the problem of low working efficiency of one-time drainage of plunger lifting exists.

SUMMERY OF THE UTILITY MODEL

It is an object of the embodiment of the application to provide a plunger and a wellhead gas production system.

According to a first aspect of the application, a plunger is provided, wherein an axially extending long hole is formed in the plunger, a first liquid inlet channel communicated with the long hole is formed in one end of the plunger, and an atomizing channel communicated with the long hole is radially formed in the plunger; a plugging piece is arranged in the long hole and is in sliding sealing fit with the inner wall of the long hole, a groove body is formed in the outer surface of the plunger, the atomizing channel is communicated with the groove body in the outer surface of the plunger, the plugging piece is in a balanced state when being positioned between the first liquid inlet channel and the atomizing channel, and the plugging piece is in an atomizing state when being positioned between the atomizing channel and one end, far away from the first liquid inlet channel, of the long hole; the closure is configured to: the liquid atomizing device can move from the equilibrium state to the atomizing state under the action of pressure, so that the liquid in the long hole is sprayed out of the atomizing channel.

Optionally, the plunger includes fixed connection's drainage pole and feed liquor pole, slot hole partly is located in the drainage pole, another part is located in the feed liquor pole, first feed liquor channel sets up the drain pole one end is kept away from of feed liquor pole, the atomizing passageway sets up on the drainage pole.

Optionally, the liquid discharge rod and the liquid inlet rod are detachably and fixedly connected and sealed through a sealing structure.

Optionally, feed liquor pole one end grafting cooperation is in the flowing back pole one end, radially wear to be equipped with holding screw on the flowing back pole, holding screw supports tightly the lateral wall of feed liquor pole.

Optionally, a first limit step is formed at the joint of the long hole and the first liquid inlet channel, and the first limit step limits the plugging piece from being separated from the long hole; the plunger is kept away from first inlet channel one end and is provided with the second inlet channel, the second inlet channel with the slot hole intercommunication, and intercommunication department forms the spacing step of second, the spacing step restriction of second the shutoff piece breaks away from the slot hole.

Optionally, the nebulization channel is provided in plurality and distributed over the same cross section of the plunger, or over different cross sections of the plunger.

Optionally, the outer surface of the plunger is provided with a plurality of annular grooves, and the annular grooves are distributed at intervals along the axial direction of the plunger.

Optionally, the plunger outer surface is provided with a plurality of chutes, and a plurality of the chutes spirally extend around the plunger axis in the same direction.

Optionally, one end of the plunger, which is far away from the first liquid inlet channel, is provided with a matching part in clamping fit with the plunger catching device.

According to a second aspect of the application, the wellhead gas production system comprises a wellhead gas production tree, a plunger capture device installed at the top end of the wellhead gas production tree, and a plunger; the plunger can be captured by the plunger capture device when moving upward from the well into the wellhead gas production tree.

The utility model provides a beneficial effect lies in, the plunger is at the well during operation in the gas production well, up-and-down motion under the pressure effect in the well, ponding discharge in the well, the shutoff piece of plunger changes between balanced state and atomizing state under the pressure effect in the well, when the shutoff piece is located balanced state, can separate the ponding of plunger top and below, along with the output of groundwater, shaft bottom pressure crescent, the shutoff piece moves to atomizing state from balanced state, make the first inlet channel and the atomizing channel intercommunication of plunger, the ponding of plunger below can be through atomizing channel blowout, and reach the plunger top, the well head is released by the plunger, thereby improve the drainage work efficiency of plunger.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of the overall configuration of a wellhead gas production system provided by the present application;

FIG. 2 is a schematic view of the overall construction of the plunger provided herein;

FIG. 3 is a cross-sectional view of one embodiment of a plunger provided herein;

fig. 4 is a cross-sectional view of another embodiment of a plunger as provided herein.

The one-to-one correspondence between component names and reference numbers in fig. 1-4 is as follows: 100. a plunger; 101. a long hole; 102. a first liquid inlet channel; 103. an atomizing channel; 104. a first limit step; 105. a second liquid inlet channel; 106. a second limit step; 110. a blocking member; 120. a liquid draining rod; 130. A liquid inlet rod; 140. tightening the screw; 107. an annular groove; 108. a chute; 109. a fitting portion; 200. a plunger capture device; 210. a catching head; 300. and (4) a gas production tree at the wellhead.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The present application provides a wellhead gas production system, as shown in fig. 1, comprising a wellhead gas production tree 300, a plunger capture device 200, and a plunger 100.

The wellhead gas production tree is a wellhead device used for switching on and off a well, adjusting pressure, gas flow, circulating killing well and other operations in natural gas production operation, is connected with gas well oil, a casing and ground process equipment and plays a very important role, and the wellhead gas production tree refers to a part above an oil pipe head in the wellhead device. It should be noted that the specific structure and the working principle of the wellhead gas production tree are the same as those in the prior art, and those skilled in the art can completely implement the wellhead gas production tree based on the prior art, so that the detailed description is omitted here.

The plunger is arranged in the well and can move up and down by utilizing the self energy in the well, when the plunger is lifted upwards, the accumulated water above the plunger can be pushed out of the well mouth, and the accumulated water can be discharged from the well mouth gas production tree so as to reduce the influence of the accumulated water on the gas production efficiency.

The plunger catching device is used for being matched with a wellhead gas production tree, and when the plunger moves upwards to the wellhead gas production tree from the inside of the well, the plunger catching device can grab the plunger at a proper time and then completely take out the plunger from the gas production well. It should be noted that the term "appropriate timing" as used herein refers to the periodic replacement of a heavily worn plunger or the like, and is determined empirically by those skilled in the art depending on the actual application.

The specific structure and the working principle of the wellhead gas production system are described in detail by taking a specific embodiment as an example in combination with the attached drawings of the specification.

The attached drawings 2 and 3 in the description are schematic diagrams of a plunger of a wellhead gas production system, as shown in the figure, an axially extending long hole 101 is formed in the plunger 100, a first liquid inlet channel 102 is formed in one end of the plunger 100, the first liquid inlet channel 102 is communicated with the long hole 101, an atomizing channel 103 is radially formed in the side wall of the plunger 100, and the atomizing channel 103 is communicated with the long hole 101; the plunger 100 is provided with a blocking piece 110 inside, and the blocking piece 110 is in sliding sealing fit with the inner wall of the long hole 101 and can freely move along the long hole 101 under the action of external force. The outer surface of the plunger 100 may be provided with a groove, and the atomization passage 103 is communicated with the groove on the outer surface of the plunger 100.

The block piece 110 may be a sphere, cylinder or other structure capable of sliding and sealing engagement with the inner wall of the elongated hole 101, which has a balanced state and an atomized state. In an equilibrium state, the blocking piece 110 is positioned between the first liquid inlet channel 102 and the atomizing channel 103, and at the moment, the first liquid inlet channel 102 and the atomizing channel 103 are separated by the blocking piece 110. In the atomizing state, the blocking piece 110 is located between the atomizing channel 103 and one end of the long hole 101, which is far away from the first liquid inlet channel 102, and at the moment, the first liquid inlet channel 102 is communicated with the atomizing channel 103. The closure 110 is configured to: can move from a balanced state to an atomizing state under the action of external pressure, so that the gas and the liquid in the long hole 101 are sprayed out of the atomizing channel 103. When the plunger 100 works in a well, accumulated water and gas are arranged below the plunger 100, the gas below the plunger 100 can carry part of liquid into the first liquid inlet channel 102, then the liquid is sprayed out of the atomizing channel 103 in a mist shape under the action of pressure difference and enters the upper part of the plunger 100, and the liquid is pushed out of a well mouth by the plunger 100, so that the drainage efficiency of the plunger 100 is improved.

The atomizing channel 103 is arranged at the upper part of the plunger 100, and the pressure difference between the inside and the outside of the upper part of the plunger 100 is larger, so that larger pressure can be provided for the gas and the liquid in the long hole 101, and the liquid can be sprayed in a mist shape. In particular, the nebulization channel 103 may be provided at one third of the axial dimension of the plunger 100.

When the plunger 100 works, the plunger moves along the inner wall of the well, water accumulated in the well is separated above the plunger 100 and below the plunger 100, and part of gas such as natural gas generated in the well is also reserved below the plunger 100. The first inlet channel 102 of the plunger 100 faces to the bottom of the well, so that water and gas below the plunger 100 can enter the first inlet channel 102 of the plunger 100, and the blocking piece 110 is subjected to the pressure of the water above the plunger 100 and the pressure of the water and gas below the plunger 100. When the block piece 110 is in the equilibrium state, the first liquid inlet passage 102 and the atomizing passage 103 can be partitioned, thereby partitioning accumulated water above and below the plunger 100. When the plunger 100 moves from a balanced state to an atomization state under the action of pressure, the first liquid inlet channel 102 of the plunger 100 can be communicated with the atomization channel 103, and accumulated water and gas below the plunger 100 are discharged to the upper side of the plunger 100 through the first liquid inlet channel 102, the long hole 101 and the atomization channel 103.

In order to restrain the block piece 110 in the long hole 101 of the plunger 100, a first limit step 104 may be formed at a junction of the long hole 101 and the first intake passage 102 to prevent the block piece 110 from escaping from the long hole 101 into the first intake passage 102. The first limiting step 104 can be formed by setting the radial dimension of the first liquid inlet channel 102 to be smaller than the dimension of the long hole 101, so that the first liquid inlet channel 102 and the long hole 101 form a stepped hole, and the first limiting step 104 is formed; a flange protruding radially inward may be provided between the first liquid inlet passage 102 and the long hole 101, and a first limit step 104 may be formed on a side of the flange facing the long hole 101.

The plunger 100 can be provided with a second liquid inlet channel 105 at one end far away from the first liquid inlet channel 102, the second liquid inlet channel 105 is communicated with the long hole 101, and accumulated water entering the long hole 101 from the second liquid inlet channel 105 can balance the pressure at the upper end and the lower end of the plugging piece 110. When the pressure of the accumulated water above the plunger 100 and the weight of the block piece 110 are greater than the pressure of the gas, accumulated water below the plunger 100 and the friction force experienced by the block piece 110, the block piece 110 can move from the atomized state to the equilibrium state.

In order to prevent the blocking piece 110 from escaping from the elongated hole 101 and entering the second inlet channel 105, a second limit step 106 may be provided at the junction of the second inlet channel 105 and the elongated hole 101. In one embodiment, the second inlet channel 105 and the long hole 101 may be machined as stepped holes, so that the radial dimension of the second inlet channel 105 is smaller than the radial dimension of the long hole 101, thereby forming a second limit step 106. In another embodiment, a flange protruding radially inward is provided between the second liquid inlet channel 105 and the long hole 101, and a side of the flange facing the long hole 101 is provided with a second limit step 106.

The plunger 100 may be provided in a split configuration to facilitate manufacturing and installation of the closure 110. For example, the plunger 100 may include several tube segments that are axially connected; alternatively, the plunger 100 may include several arcuate tube walls that are radially connected. In this embodiment, the plunger 100 is a split structure with several axially connected tube segments. Specifically, the plunger 100 comprises a liquid discharge rod 120 and a liquid inlet rod 130, the liquid discharge rod 120 and the liquid inlet rod 130 are coaxially and fixedly connected, one part of the long hole 101 is positioned in the liquid discharge rod 120, the other part of the long hole 101 is positioned in the liquid inlet rod 130, and the diameters of the two parts of the long hole 101 are equal. The first liquid inlet channel 102 is arranged at one end of the liquid inlet rod 130 far away from the liquid discharge rod 120, and the atomizing channel 103 is arranged on the liquid discharge rod 120.

The liquid inlet rod 130 and the liquid outlet rod 120 may be detachably fixed, and the connection manner includes, but is not limited to, a threaded connection, a screw fixation connection, welding, and the like. The junction of the liquid discharge rod 120 and the liquid inlet rod 130 can be further provided with a sealing structure which can be a sealing ring and the like, so that leakage of a gap between the liquid discharge rod 120 and the liquid inlet rod 130 is prevented.

In this embodiment, the liquid discharging rod 120 and the liquid inlet rod 130 are connected by inserting and are fixed by a set screw 140. Specifically, the link processing of flowing back pole 120 has the spliced eye, the aperture of spliced eye is greater than the aperture of slot hole 101, the one end processing of liquid inlet rod 130 is the grafting end of pegging graft with the spliced eye cooperation of flowing back pole 120, a plurality of screw holes have radially been seted up on the link of flowing back pole 120, a plurality of screw hole evenly distributed, set screw 140 all wears to be equipped with in every screw hole, set screw 140's tip can support the lateral wall of tightly advancing liquid inlet rod 130 grafting end, thereby strengthen being connected between liquid inlet rod 130 and the flowing back pole 120. In other embodiments, the insertion end of the liquid inlet rod 130 may be provided with an external thread, and the insertion hole of the liquid outlet rod 120 may be provided with an internal thread matching with the insertion end of the liquid inlet rod 130, which are connected by a thread. Set screw 140 may be a slotted flat end set screw that can not protrude beyond the threaded hole. Of course, the insertion connection between the liquid discharging rod 120 and the liquid inlet rod 130 may be achieved by inserting one end of the liquid discharging rod 120 into one end of the liquid inlet rod 130 or by screwing, and forming a threaded hole in the liquid inlet rod 130 in the radial direction, and forming a set screw 140 in the threaded hole, the end of which abuts against the side wall of the liquid discharging rod 120, to strengthen the connection.

One or at least two atomizing channels 103 on the plunger 100 can be provided, and the aperture of the atomizing channel 103 is much smaller than that of the first liquid inlet channel 102, when the plugging piece 110 moves upwards under the action of pressure to an atomizing state, the liquid in the long hole 101 can be sprayed in an atomized manner from the atomizing channel 103 with a smaller aperture. Specifically, the atomizing channels 103 are all disposed on the liquid discharge rod 120 of the plunger 100, and a distance is left between the atomizing channels 103 and the end of the liquid discharge rod 120 where the second liquid inlet channel 105 is located, so as to accommodate the plugging member 110. The at least two nebulization channels 103 can be arranged on the same cross section of the plunger 100 or can be arranged on different cross sections of the plunger 100.

In the embodiment in which the atomizing channels 103 are located on the same cross-section of the plunger 100, as shown in fig. 3, when the block piece 110 crosses the cross-section of the plurality of atomizing channels 103, the switching between the equilibrium state and the atomizing state can be achieved, and all the atomizing channels 103 are simultaneously communicated with the first liquid inlet channel 102. The plurality of atomization passages 103 can be evenly distributed on the cross section of the plunger 100, for example, four atomization passages 103 are provided, and the atomization passages are uniformly distributed on the same cross section of the plunger 100.

In embodiments in which the nebulization channel 103 is provided on different cross-sections of the plunger 100, as illustrated in fig. 4, the transition between the equilibrium state and the nebulization state can be effected when the block piece 110 passes over the nebulization channel 103 closest to the first inlet channel 102. When the plugging piece 110 crosses the atomizing channel 103 closest to the first liquid inlet channel 102 under the action of pressure, the atomizing channel 103 is communicated with the first liquid inlet channel 102 for spraying, when the pressure of accumulated water and gas below the plunger 100 is further increased, the plugging piece 110 can continue to move upwards to cross other atomizing channels 103, and other atomizing channels 103 are connected with the first liquid inlet channel 102, so that the drainage efficiency is improved.

The outer surface of the plunger 100 can be provided with a plurality of annular grooves 107, a gap is formed between each annular groove 107 and the inner wall of the gas production well, each annular groove 107 is used as a groove body opened on the outer surface of the plunger 100, and the atomizing channel 103 can be communicated with each annular groove 107. A plurality of annular grooves 107 may be evenly spaced axially along the plunger 100. Specifically, the annular groove 107 may be provided on the outer surfaces of the liquid discharge rod 120 and the liquid inlet rod 130 of the plunger 100, and the annular groove 107 may be provided obliquely such that an obtuse angle is formed between the side wall of the annular groove 107 close to the first liquid inlet passage 102 and the bottom of the annular groove 107, and an acute angle is formed between the side wall of the annular groove 107 close to the second liquid inlet passage 105 and the bottom of the annular groove 107. Gas such as natural gas below the plunger 100 can enter the annular groove 107, the annular groove 107 can increase the force bearing area with the gas, and the gas can provide larger lifting force for the plunger 100, so that the lifting efficiency of the plunger 100 is improved.

The outer surface of the plunger 100 may be provided with a plurality of angled slots 108, the angled slots 108 forming a gap with the inner wall of the gas production well. The plurality of angled slots 108 may be evenly spaced on the outer surface of the plunger 100, and the plurality of angled slots 108 may extend helically in the same direction about the axis of the plunger 100. Specifically, the chute 108 may be provided on an outer surface of the intake rod 130 and extend to an end of the first intake passage 102 of the intake rod 130. Gas, such as natural gas, below the plunger 100 can enter the plurality of chutes 108, causing the plunger 100 to rotate about its axis during the lifting process. After the gas recovery well works for a period of time, paraffin or other waxy materials can be accumulated on the well wall to generate resistance to the plunger, and impurities such as paraffin on the well wall can be scraped in the rotating process of the plunger 100, so that the plunger 100 can smoothly run in the well.

The plunger 100 may have both annular grooves 107 and angled grooves 108 on its outer surface. When the plunger 100 is operated in the well, the first inlet channel 102 faces downwards, and the second inlet channel 105 faces upwards, and for the convenience of this document, the part of the plunger 100 relatively close to the first inlet channel 102 is defined as the lower part, and the part of the plunger 100 relatively close to the second inlet channel 105 is defined as the upper part, based on the posture of the plunger 100 when operated. A plurality of chutes 108 are arranged at the lower part of the first liquid inlet channel 102, a plurality of annular grooves 107 are arranged at the upper part of the plunger 100, and the annular groove 107 positioned at the lowest part is communicated with the plurality of chutes 108, and gas below the plunger 100 can enter the annular groove 107 through the chutes 108.

The boundary between the upper and lower portions of the plunger 100 is not specifically limited. In one embodiment, the annular groove 107 is disposed at an end of the tapping rod 120 distal from the intake rod 130, and the plurality of chutes 108 are disposed on the intake rod 130 of the plunger 100 and extend to the tapping rod 120. In another embodiment, a plurality of annular grooves 107 are formed on the draining rod 120 and extend to the liquid inlet rod 130, and a plurality of chutes 108 are formed at an end of the liquid inlet rod 130 far from the draining rod 120. In yet another embodiment, the annular grooves 107 are provided only on the tapping rod 120 and the chutes 108 are provided only on the tapping rod 130.

The end of the plunger 100 away from the first inlet channel 102 is provided with an engaging portion 109 that engages with the plunger catch device 200, and when the plunger 100 moves into the wellhead gas production tree 300 and reaches the plunger catch device 200, the plunger catch device 200 can catch the engaging portion 109 of the plunger 100. The specific structure and operation principle of the plunger capture device 200 can be directly realized by the prior art, and the skilled person can fully realize the prior art. The present embodiment will be described in detail below with reference to the specific structure and the principle of the engagement between the engagement portion 109 of the plunger 100 and the plunger capture device 200.

The plunger 100 tapers in diameter to a conical surface near one end of the mating portion 109, the mating portion 109 being a flange formed at the end of the plunger 100. The plunger catching device 200 has a catching head 210 for catching the plunger 100, the catching head 210 has at least two elastic arms elastically expandable in a radial direction by an external force, and the lower ends of the elastic arms are provided with hook portions protruding inward in the radial direction and engageable with the engagement portions 109 of the plunger 100. When the plunger 100 reaches the plunger catching device 200, the engagement portion 109 of the plunger 100 can be squeezed between the elastic arms of the catching head 210, and the hook portion at the lower end of the elastic arm can be caught at the bottom of the engagement portion 109, thereby catching the plunger 100.

The well head gas production system of this application implements the principle as follows: when the plunger 100 works in the well, due to the pressure change above and below the plunger 100, the plunger 100 moves up and down in the well, and accumulated water in the well is pushed out of the well mouth by the plunger 100 and is discharged through the gas production tree 300 of the well mouth; plunger 100's shutoff piece 110 is because pressure variation changes between balanced state and atomizing state, when shutoff piece 110 is located balanced state, can separate plunger 100 top and ponding of below, along with the output of groundwater, bottom hole pressure crescent, shutoff piece 110 moves to atomizing state from balanced state, make plunger 100's first inlet channel 102 and atomizing channel 103 intercommunication, the ponding of plunger 100 below can be through atomizing channel 103 blowout, and reach plunger 100 top, the well head is released by plunger 100, thereby improve plunger 100's drainage work efficiency.

The application also provides a plunger 100, the plunger 100 is the plunger 100 in the wellhead gas production system for draining accumulated water in a gas production well, and the specific structure and principle of the plunger are not repeated herein.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the application is defined by the appended claims.

Claims (10)

1. The plunger is characterized in that an axially extending long hole (101) is formed in the plunger (100), a first liquid inlet channel (102) communicated with the long hole (101) is formed in one end of the plunger (100), and an atomizing channel (103) communicated with the long hole (101) is radially formed in the plunger (100); a plugging piece (110) is arranged in the long hole (101), the plugging piece (110) is in sliding sealing fit with the inner wall of the long hole (101), a groove body is formed in the outer surface of the plunger (100), the atomizing channel (103) is communicated with the groove body in the outer surface of the plunger (100), the plugging piece (110) is in a balanced state when positioned between the first liquid inlet channel (102) and the atomizing channel (103), and the plugging piece (110) is in an atomizing state when positioned between the atomizing channel (103) and one end, far away from the first liquid inlet channel (102), of the long hole (101);

the closure (110) is configured to: can move from the equilibrium state to the atomization state under the action of pressure, so that the liquid in the long hole (101) is sprayed out of the atomization channel (103).

2. The plunger according to claim 1, characterized in that the plunger (100) comprises a fixedly connected liquid discharging rod (120) and a liquid inlet rod (130), one part of the long hole (101) is positioned in the liquid discharging rod (120), the other part of the long hole is positioned in the liquid inlet rod (130), the first liquid inlet channel (102) is arranged at one end of the liquid inlet rod (130) far away from the liquid discharging rod (120), and the atomizing channel (103) is arranged on the liquid discharging rod (120).

3. The plunger of claim 2, wherein the liquid discharge rod (120) and the liquid inlet rod (130) are detachably and fixedly connected and sealed by a sealing structure.

4. The plunger piston according to claim 3, characterized in that one end of the liquid inlet rod (130) is inserted into one end of the liquid discharge rod (120), a set screw (140) radially penetrates through the liquid discharge rod (120), and the set screw (140) abuts against the side wall of the liquid inlet rod (130).

5. The plunger according to any one of claims 1-4, wherein the junction of the slot (101) and the first inlet channel (102) forms a first limit step (104), and the first limit step (104) limits the block piece (110) from separating from the slot (101); the plunger (100) keep away from first inlet channel (102) one end and be provided with second inlet channel (105), second inlet channel (105) with slot hole (101) intercommunication, and intercommunication department forms spacing step of second (106), spacing step of second (106) restriction shutoff piece (110) break away from slot hole (101).

6. Plunger according to any of claims 1-4, characterized in that the nebulization channel (103) is provided in plurality and distributed over the same cross section of the plunger (100) or over different cross sections of the plunger (100).

7. The plunger according to any one of claims 1-4, wherein the outer surface of the plunger (100) is provided with a plurality of annular grooves (107), the annular grooves (107) being axially spaced along the plunger (100).

8. The plunger of any one of claims 1-4, wherein the plunger (100) is provided with a plurality of angled grooves (108) on the outer surface, the angled grooves (108) extending helically in the same direction about the axis of the plunger (100).

9. Plunger according to any of claims 1-4, characterised in that the end of the plunger (100) remote from the first inlet channel (102) is provided with an engagement portion (109) for snap-fit engagement with a plunger catch.

10. A wellhead gas production system, comprising a wellhead gas production tree (300), a plunger capture device (200) mounted on top of the wellhead gas production tree (300), and a plunger (100) according to any one of claims 1 to 9; the plunger (100) is capturable by the plunger capture device (200) when moving up from the well into a wellhead gas production tree (300).

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