CN113153713A

CN113153713A - Liquid discharge plunger

Info

Publication number: CN113153713A
Application number: CN202110247269.XA
Authority: CN
Inventors: 王磊; 白玉菲; 胡凯; 方松; 李宾; 张廷帅; 张昆山; 徐传龙; 孔润东; 冯占勋; 范青云; 袁兆坤; 王伟; 樊兴盛; 田鸿照; 肖寒; 刘波; 刘骞; 胡庆贺; 杨占伟
Original assignee: China National Petroleum Corp; CNPC Great Wall Drilling Co
Current assignee: China National Petroleum Corp; CNPC Great Wall Drilling Co
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-07-23
Anticipated expiration: 2041-03-05
Also published as: CN113153713B

Abstract

The application provides a flowing back plunger belongs to oil gas field development technical field. This flowing back plunger includes: the plunger comprises a connecting piece, a mounting groove, a plunger body, a plunger firing pin, a damping piece, a fixing ring and a limiting ring; the connecting piece, the mounting groove and the plunger body are arranged in the shaft, a first through hole is formed in the connecting piece, the damping piece, the fixing ring and the limiting ring are arranged in the first through hole, the fixing ring is arranged at the other end of the plunger firing pin, the limiting ring is arranged at the bottom end of the first through hole, and the fixing ring and the limiting ring are connected through the damping piece; in the process that the plunger firing pin collides with the retainer, the damping piece provides elastic force for the fixing ring and is used for buffering the impact force received by the plunger firing pin through the elastic force. Because in the process of the collision of the plunger firing pin and the locking device, the damping piece provides elastic force for the fixing ring, the impact force received by the plunger firing pin can be buffered through the elastic force, the impact force between the plunger body and the plunger firing pin is reduced, the abrasion of the plunger firing pin is reduced, and the service life of the plunger firing pin is prolonged.

Description

Liquid discharge plunger

Technical Field

The application relates to the technical field of oil and gas field development, in particular to a liquid drainage plunger.

Background

In the oil and gas well development process of low pressure low yield, when the gas output of oil and gas well is lower, can form the hydrops of take the altitude in the pit shaft of oil and gas well, and the hydrops in the pit shaft can hinder the output of gas in the oil and gas well, further influences the gas output of oil and gas well, consequently, in the development process of oil and gas well, need discharge the hydrops in the pit shaft. At present, the accumulated liquid in the shaft is generally discharged through a liquid discharge plunger.

In the related art, a liquid discharge plunger includes a plunger body and a plunger striker; wherein, the plunger body and the plunger firing pin are connected through a screw. The plunger body and the plunger firing pin are arranged in a shaft of the oil-gas well, and the outer diameter of the plunger body is matched with the inner wall of the shaft. In the development process of an oil-gas well, the plunger body moves upwards under the upward thrust of gas in the shaft and carries accumulated liquid in the shaft to move upwards so as to discharge the accumulated liquid in the shaft; and in the process that the plunger body moves downwards under the action of gravity, the plunger firing pin is used for colliding with a clamping device in the shaft and reducing the movement speed of the plunger body in the shaft. Furthermore, the accumulated liquid in the shaft can be continuously discharged through the up-and-down movement of the plunger body in the shaft.

However, in the related art, since the plunger body and the plunger rod are connected by the screw, and the screw is hard connected, the stopper and the plunger rod are hard hit during the collision of the plunger rod and the stopper, and the abrasion of the plunger rod is large, so that the service life of the plunger rod in the liquid discharge plunger is short.

Disclosure of Invention

The embodiment of the application provides a flowing back plunger, can improve the life of plunger firing pin. The technical scheme is as follows:

the embodiment of the application provides a flowing back plunger for discharge the hydrops in the pit shaft, the flowing back plunger includes: the plunger comprises a connecting piece, a mounting groove, a plunger body, a plunger firing pin, a damping piece, a fixing ring and a limiting ring;

the connecting piece and the plunger body are arranged in the shaft, a groove is formed in the bottom end of the connecting piece, the mounting groove is formed in the groove, the bottom end of the connecting piece is connected with the top end of the plunger body through the mounting groove, a first through hole is formed in the connecting piece, a second through hole is formed in the bottom of the mounting groove, a third through hole is formed in the plunger body, the first through hole, the second through hole and the third through hole are sequentially communicated, and one end of the plunger firing pin sequentially penetrates through the first through hole, the second through hole and the third through hole;

the damping piece, the fixing ring and the limiting ring are arranged in the first through hole, the fixing ring is arranged at the other end of the plunger firing pin, the limiting ring is arranged at the bottom end of the first through hole, and the fixing ring and the limiting ring are connected through the damping piece;

in the process of discharging the accumulated liquid in the shaft through the liquid discharge plunger, the plunger body is pushed by gas in the shaft to move upwards to carry the accumulated liquid in the shaft to move upwards until the accumulated liquid is discharged, in the process of impacting the plunger firing pin with the locking device, the shock absorption piece provides elastic force for the fixing ring to buffer the impact force received by the plunger firing pin through the elastic force, and the limiting ring is used for limiting the moving distance of the plunger firing pin.

In one possible implementation, the liquid discharge plunger further comprises a positioning block and a positioning groove;

the side wall of the top end of the plunger body is provided with an installation block, the positioning block is arranged at the top end of the installation block, the positioning groove is arranged on the end face of the notch of the installation groove, and the positioning groove is matched with the positioning block;

the bottom of the connecting piece is connected with the top of the plunger body through the mounting groove, and the positioning block is connected with the positioning groove and used for positioning the position of the plunger body in the groove.

In this application embodiment, owing to in the top connection process of passing through mounting groove and plunger body in the bottom of connecting piece, through locating piece and constant head tank, can fix a position the position of plunger body in the recess, avoid the plunger body to take place the skew in the recess, improved the stability of plunger body.

In another possible implementation, the drain plunger further comprises a retaining pin;

a pin groove is formed in the mounting block, and a pin hole is formed in the position, matched with the pin groove, of the groove at the bottom end of the connecting piece;

the fixing pin penetrates through the pin hole to be connected with the pin groove and is used for connecting the connecting piece with the top end of the plunger body.

In this application embodiment, owing to fix the top of connecting piece and plunger body through pinhole and keyway, prevent that the top of plunger body from taking place the skew in the recess, so further improved the stability of plunger body.

In another possible implementation manner, the fixing pin comprises a pin rod and a pin cap, and the pin rod is connected with the pin cap;

the pin rod penetrates through the pin hole to be connected with the pin groove, and the pin cap is used for being connected with the connecting piece.

In this application embodiment, because pin pole and round pin cap are connected, pass the pinhole when being connected with the cotter way at the pin pole, the round pin cap can be connected with the connecting piece, avoids the pin pole to drop from the cotter way, has improved the stability of fixed pin, and then has improved the stability of the top of plunger body in the recess.

In another possible implementation manner, the liquid discharge plunger further comprises a fixing bolt, a bolt groove is formed in the connecting piece, and a bolt hole is formed in the top end of the pin cap;

the fixing bolt penetrates through the bolt hole, is connected with the bolt groove and is used for fixing the pin cap and the connecting piece.

In this application embodiment, because through threaded connection between cap and the connecting piece, through rotatory fixing bolt, can install or dismantle the fixed pin, so improved this flowing back plunger's installation effectiveness.

In another possible implementation manner, the liquid discharge plunger further comprises a sliding block, the sliding block is arranged at one end of the pin rod, and a sliding groove matched with the sliding block is arranged in the pin hole;

during installation of the pin rod, the slider moves along the slide slot for cooperating with the slide slot to locate the position of the pin rod within the pin hole.

In this application embodiment, owing to can the location pin pole in the position of pinhole through slider and spout, avoid the pin pole to take place the skew in the pinhole, improved the stability of pin pole, and then can avoid the pin pole to take place to drop from the pinhole, so improved the stability of this fixed pin.

In another possible implementation, the drain plunger further comprises a guide rod;

the guide rod is arranged on the end face of the top end of the plunger body, and a guide groove matched with the guide rod is formed in the inner wall of the mounting groove;

the bottom end of the connecting piece is connected with the top end of the plunger body through the mounting groove, and the guide rod slides in the guide groove and is used for being matched with the guide groove to position the position of the plunger body in the groove.

In this application embodiment, because the top connection in-process of mounting groove and plunger body is passed through to the bottom at the connecting piece, guide bar and guide way can fix a position the position of plunger body in the recess, avoid the plunger body to take place the skew in the recess, have improved the stability of plunger body.

In another possible implementation, the drain plunger further comprises a first sealing ring;

the first sealing ring is arranged on a notch of the mounting groove and used for sealing a gap between the mounting groove and the plunger body.

In this application embodiment, the first sealing washer can seal the gap between spacing ring and the plunger firing pin, avoids impurity in the pit shaft to get into the third through hole, and then has avoided too much impurity in the third through hole to produce the influence to the motion of plunger firing pin.

In another possible implementation, the drain plunger further comprises a second sealing ring;

the second sealing ring is arranged between the limiting ring and the plunger firing pin and used for sealing a gap between the limiting ring and the plunger firing pin.

In this application embodiment, the second sealing washer can seal the gap between spacing ring and the plunger firing pin, avoids impurity in the pit shaft to get into first through-hole, and then has avoided too much impurity in the first through-hole to produce the influence to the motion of plunger firing pin.

In another possible implementation, the drain plunger further comprises a wear ring; the wear-resistant ring is arranged on the outer side of the fixing ring.

In the embodiment of the application, the wear-resistant ring is arranged on the outer side of the fixing ring, so that the service life of the fixing ring can be prolonged in the process that the plunger firing pin moves along the first through hole, the fixing ring is connected with the other end of the plunger firing pin, the situation that the plunger firing pin is replaced due to abrasion of the fixing ring is avoided, and the service life of the liquid discharge plunger is prolonged.

The technical scheme provided by the embodiment of the application has the following beneficial effects:

the embodiment of the application provides an improved flowing back plunger, because solid fixed ring and spacing ring in the flowing back plunger pass through the damper and connect, and solid fixed ring sets up the other end at the plunger firing pin, the spacing ring sets up the bottom at the through-hole, at plunger firing pin and card ware striking in-process like this, the damper provides elasticity to solid fixed ring, thereby can cushion the impact that the plunger firing pin received through elasticity, for the impact between plunger body and the plunger firing pin, the wearing and tearing of plunger firing pin have been reduced, so the life of plunger firing pin has been prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a drain plug according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a drain plug according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a drain plug according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a fixing bolt provided according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a fixing pin according to an embodiment of the present application.

11 connecting piece

111 pinhole

112 bolt slot

12 mounting groove

121 guide groove

13 plunger body

131 pin slot

132 guide bar

14 plunger firing pin

15 shock-absorbing member

16 fixed ring

17 stop collar

18 positioning block

19 positioning groove

20 fixed pin

201 pin rod

202 pin cap

203 bolt hole

21 fixing bolt

22 slide block

23 chute

24 first seal ring

25 second seal ring

26 wear-resistant ring

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 and 2 are schematic structural views of a liquid discharge plunger provided by the present application. Referring to fig. 1 and 2, the drain plunger includes: the plunger type plunger comprises a connecting piece 11, a mounting groove 12, a plunger body 13, a plunger firing pin 14, a damping piece 15, a fixing ring 16 and a limiting ring 17;

the connecting piece 11 and the plunger body 13 are arranged in a shaft, a groove is formed in the bottom end of the connecting piece 11, the mounting groove 12 is formed in the groove, the bottom end of the connecting piece 11 is connected with the top end of the plunger body 13 through the mounting groove 12, a first through hole is formed in the connecting piece 11, a second through hole is formed in the bottom of the mounting groove 12, a third through hole is formed in the plunger body 13, the first through hole, the second through hole and the third through hole are sequentially communicated, and one end of the plunger firing pin 14 sequentially penetrates through the first through hole, the second through hole and the third through hole;

the damping piece 15, the fixing ring 16 and the limiting ring 17 are arranged in the first through hole, the fixing ring 16 is arranged at the other end of the plunger firing pin 14, the limiting ring 17 is arranged at the bottom end of the first through hole, and the fixing ring 16 and the limiting ring 17 are connected through the damping piece 15;

in the process of discharging the accumulated liquid in the shaft through the liquid discharging plunger, the plunger body 13 is pushed by gas in the shaft to move upwards to carry the accumulated liquid in the shaft to move upwards until the accumulated liquid is discharged, in the process of impacting the plunger firing pin 14 with the locking device, the shock absorption piece 15 provides elastic force for the fixing ring 16 to buffer the impact force applied to the plunger firing pin 14 through the elastic force, and the limiting ring 17 is used for limiting the moving distance of the plunger firing pin 14.

The embodiment of the application provides a liquid discharge plunger, because the fixed ring 16 and the limit ring 17 in the liquid discharge plunger are connected through the shock absorbing member 15, the fixed ring 16 is arranged at the other end of the plunger firing pin 14, and the limit ring 17 is arranged at the bottom end of the through hole, in the process that the plunger firing pin 14 collides with the retainer, the shock absorbing member 15 provides elastic force for the fixed ring 16, so that the impact force applied to the plunger firing pin 14 can be buffered through the elastic force, the impact force between the plunger body 13 and the plunger firing pin 14 is reduced, the abrasion of the plunger firing pin 14 is reduced, and the service life of the plunger firing pin 14 is prolonged.

Introduction of the connecting member 11: the connection 11 is arranged in the wellbore. The bottom of connecting piece 11 is equipped with the recess, and mounting groove 12 sets up in the recess, and the bottom of connecting piece 11 is passed through mounting groove 12 and is connected with the top of plunger body 13. In a possible implementation manner, the groove and the mounting groove 12 are integrally formed, or the groove and the mounting groove 12 are connected by welding. The outer diameter of the coupling 11 matches the inner diameter of the wellbore.

In one possible implementation, the mounting groove 12 is a circular mounting groove 12, the groove is a circular groove, and the inner diameter of the groove matches the outer diameter of the mounting groove 12. And, the groove depth of the groove is greater than that of the mounting groove 12. The top end of the plunger body 13 is connected with the mounting groove 12 in the groove.

In a possible implementation manner, a first through hole is formed in the connecting piece 11, a second through hole is formed in the bottom of the mounting groove 12, a third through hole is formed in the plunger body 13, and the first through hole, the second through hole and the third through hole are sequentially communicated.

The material of the connecting member 11 may be metal, for example, iron, copper, or the like; but also metal alloys such as carbon steel, chrome steel, etc. In the embodiment of the present application, the material of the connecting member 11 is not particularly limited, and may be set and modified as needed. Optionally, the first through hole is disposed in the center of the connecting member 11, the second through hole is disposed in the center of the bottom of the mounting groove 12, and the third through hole is disposed in the center of the plunger body 13. That is, the first through hole, the second through hole and the third through hole are all central through holes.

The inner diameters of the first through hole, the second through hole and the third through hole may be any value between 0.1m and 0.5m, for example, 0.2m, 0.25m, 0.3m, etc.; in the embodiment of the present application, the sizes of the inner diameters of the first through hole, the second through hole, and the third through hole are not particularly limited, and may be set and modified as needed. In one possible implementation, the first through hole, the second through hole, and the third through hole have the same inner diameter, and are matched to the outer diameter of the plunger striker 14.

Introduction of the mounting groove 12: the bottom of connecting piece 11 is equipped with the recess, and mounting groove 12 sets up in the recess, and the bottom of connecting piece 11 is passed through mounting groove 12 and is connected with the top of plunger body 13.

It should be noted that, in the process that the bottom end of the connecting piece 11 is connected with the top end of the plunger body 13 through the mounting groove 12, the mounting groove 12 can position the top end of the plunger body 13, which not only increases the stability of the plunger body 13, but also improves the connection efficiency between the bottom end of the connecting piece 11 and the top end of the plunger body 13.

In a possible implementation manner, with continued reference to fig. 2, a mounting block is disposed on a side wall of the top end of the plunger body 13, the positioning block 18 is disposed at the top end of the mounting block, the positioning groove 19 is disposed on an end surface of the notch of the mounting groove 12, and the positioning groove 19 is matched with the positioning block 18; in the process that the bottom end of the connecting piece 11 is connected with the top end of the plunger body 13 through the mounting groove 12, the positioning block 18 is connected with the positioning groove 19 and used for positioning the position of the plunger body 13 in the groove.

In this application embodiment, because the bottom of connecting piece 11 is passed through mounting groove 12 and is connected the in-process with the top of plunger body 13, through locating piece 18 and constant head tank 19, can fix a position the position of plunger body 13 in the recess, avoid plunger body 13 to take place the skew in the recess, improved plunger body 13's stability.

The material of the mounting groove 12 may be metal, for example, iron, copper, etc.; but also metal alloys such as carbon steel, chrome steel, etc. In the embodiment of the present application, the material of the connecting member 11 is not particularly limited, and may be set and modified as needed.

Introduction of the plunger body 13: the plunger body 13 is arranged in the shaft, and in the process of discharging the effusion in the shaft through the liquid discharge plunger, the plunger body 13 moves upwards under the thrust of gas in the shaft and is used for carrying the effusion in the shaft to move upwards until the effusion is discharged. Optionally, the outer diameter of the plunger body 13 matches the inner diameter of the wellbore.

Alternatively, the plunger body 13 is cylindrical in shape. The material of the plunger body 13 may be metal, for example, iron, copper, or the like; but also metal alloys such as carbon steel, chrome steel, etc. In the embodiment of the present application, the shape and material of the plunger body 13 are not particularly limited, and may be set and modified as needed.

In one possible implementation, see fig. 3, the drainage plunger further comprises a fixing pin 20; the top end of the plunger body 13 is provided with a mounting block, the mounting block is provided with a pin groove 131, and a pin hole 111 is arranged at a position, matched with the pin groove 131, on the groove at the bottom end of the connecting piece 11; and a fixing pin 20 passing through the pin hole 111 and connected to the pin groove 131 for connecting the connecting member 11 to the top end of the plunger body 13.

In the embodiment of the present application, since the connecting member 11 and the top end of the plunger body 13 are fixed by the pin hole 111 and the pin groove 131, the top end of the plunger body 13 is prevented from being deviated in the groove, so that the stability of the plunger body 13 is further improved.

In one possible implementation, with continued reference to fig. 3, the retaining pin 20 includes a pin shank 201 and a pin cap 202, with the pin shank 201 and the pin cap 202 connected; the pin rod 201 passes through the pin hole 111 to be connected with the pin slot 131, and the pin cap 202 is used for being connected with the connecting piece 11.

Optionally, the pin rod 201 and the pin cap 202 are integrally formed or connected by welding. Be equipped with first external screw thread on the pin pole 201, be equipped with first internal thread in the cotter way 131, through first external screw thread and first internal thread connection between pin pole 201 and the cotter way 131.

In this application embodiment, because pin rod 201 and round pin cap 202 are connected, when pin rod 201 passed pinhole 111 and is connected with keyway 131, round pin cap 202 can be connected with connecting piece 11, avoids pin rod 201 to drop from keyway 131, has improved the stability of fixed pin 20, and then has improved the stability of the top of plunger body 13 in the recess.

In one possible implementation, referring to fig. 4, the drainage plunger further comprises a fixing bolt 21, a bolt groove 112 is formed on the connecting piece 11, and a bolt hole 203 is formed at the top end of the pin cap 202; the fixing bolt 21, which passes through the bolt hole 203, is connected to the bolt groove 112 for fixing the pin 20 to the connecting member 11.

In one possible implementation, the bolt slot 112 is provided in the outer wall of the groove of the connecting member 11, and the position of the bolt slot 112 matches the position of the bolt hole 203. The inner diameter of bolt groove 112, the inner diameter of bolt hole 203, and the outer diameter of fixing bolt 21 are the same. Optionally, a second external thread is provided on the fixing bolt 21, a second internal thread is provided in the bolt slot 112, and the fixing bolt 21 and the bolt slot 112 are connected through the second external thread and the second internal thread.

In the embodiment of the present application, since the fixing pin 20 can be installed or removed by rotating the fixing bolt 21 through the screw connection between the cap 202 and the connecting member 11, the installation efficiency of the drain plug is improved.

In a possible implementation manner, referring to fig. 5, the liquid discharge plunger further comprises a sliding block 22, the sliding block 22 is arranged at one end of the pin rod 201, and a sliding groove 23 matched with the sliding block 22 is arranged in the pin hole 111; during the installation of the pin rod 201, the slider 22 moves along the slide groove 23 for cooperating with the slide groove 23 to position the pin rod 201 in the pin hole 111.

Alternatively, the slider 22 may be rectangular or cylindrical. The length of the sliding block 22 is matched with the inner diameter of the pin hole 111, the width of the sliding groove 23 is matched with the width of the sliding block 22, and the length of the sliding groove 23 is smaller than the length of the pin hole 111. In the embodiment of the present application, the shape and length of the slider 22 and the groove length of the slide groove 23 are not particularly limited, and may be set and modified as needed.

In a possible implementation, one end of the pin 201 is integrally formed with the slider 22. In another possible implementation, one end of the pin rod 201 is provided with a through hole matching with the slider 22, and the slider 22 passes through the through hole and is connected with the pin rod 201. Optionally, the sliding block 22 and the pin rod 201 may be connected by welding.

In the embodiment of the present application, since the position of the pin rod 201 in the pin hole 111 can be positioned by the slider 22 and the sliding groove 23, the pin rod 201 is prevented from shifting in the pin hole 111, the stability of the pin rod 201 is improved, and further the pin rod 201 can be prevented from falling off from the pin hole 111, so that the stability of the fixing pin 20 is improved.

In one possible implementation, with continued reference to fig. 3, the drain plunger further includes a guide rod 132; the guide rod 132 is arranged on the end surface of the top end of the plunger body 13, and the inner wall of the mounting groove 12 is provided with a guide groove 121 matched with the guide rod 132; during the connection of the bottom end of the connecting member 11 with the top end of the plunger body 13 through the mounting groove 12, the guide rod 132 slides within the guide groove 121 for cooperating with the guide groove 121 to position the plunger body 13 within the recess.

The length of the guide rod 132 may be any value between 10cm and 30cm, for example, 10cm, 15cm, 20cm, etc. Alternatively, the guide groove 121 has the same groove depth as the length of the guide rod 132. In the embodiment of the present application, the length of the guide bar 132 is not particularly limited, and may be set and modified as needed.

In the embodiment of the present application, in the process of connecting the bottom end of the connecting member 11 with the top end of the plunger body 13 through the mounting groove 12, the guide rod 132 and the guide groove 121 can position the position of the plunger body 13 in the groove, so as to avoid the plunger body 13 from deviating in the groove, and improve the stability of the plunger body 13.

In another possible implementation, the drainage plunger further comprises a first sealing ring 24; a first seal ring 24 is provided in a notch of the mounting groove 12 for sealing a gap between the mounting groove 12 and the plunger body 13.

In the embodiment of the present application, the first sealing ring 24 can seal a gap between the limiting ring 17 and the plunger 14, so as to prevent impurities in the shaft from entering the third through hole, and further prevent excessive impurities in the third through hole from affecting the movement of the plunger 14.

Description of plunger firing pin 14: one end of the plunger firing pin 14 sequentially penetrates through the first through hole, the second through hole and the third through hole, the other end of the plunger firing pin 14 is provided with a fixing ring 16, the bottom end of the first through hole is provided with a limiting ring 17, and the fixing ring 16 and the limiting ring 17 are connected through a damping piece 15.

The material of plunger firing pin 14 may be a metal, e.g., iron, copper, etc.; but also metal alloys such as carbon steel, chrome steel, etc. The outer diameter of plunger 14 may be any value between 0.1m and 0.5m, e.g., 0.2m, 0.25m, 0.3m, etc.; in the embodiment of the present application, the material and size of the plunger striker 14 are not particularly limited, and may be set and modified as needed.

In a possible implementation, the drainage plunger further comprises a second sealing ring 25; a second sealing ring 25 is arranged between the stop collar 17 and the plunger rod 14 for sealing the gap between the stop collar 17 and the plunger rod 14.

In the embodiment of the present application, the second sealing ring 25 can seal the gap between the limiting ring 17 and the plunger 14, so as to prevent impurities in the shaft from entering the first through hole, and further prevent excessive impurities in the first through hole from affecting the movement of the plunger 14.

Introduction of the damper 15: the damper 15, the fixing ring 16, and the stopper ring 17 are disposed in the first through hole, and the fixing ring 16 and the stopper ring 17 are connected through the damper 15. The damper member 15 provides an elastic force to the fixing ring 16 during the discharging plunger discharging process for buffering the striking force to which the plunger striker 14 is subjected by the elastic force.

In one possible realization, the damping member 15 is a damping spring. One end of the damping spring is connected with the fixing ring 16 through welding, and the other end of the damping spring is connected with the limiting ring 17 through welding.

In the embodiment of the application, the fixing ring 16 and the limiting ring 17 in the liquid discharge plunger are connected through the shock absorber 15, and the shock absorber 15 provides elastic force to the fixing ring 16 in the process of the plunger striker 14 colliding with the stopper, so that the impact force received by the plunger striker 14 can be buffered through the elastic force, the impact force between the plunger body 13 and the plunger striker 14 is reduced, the abrasion of the plunger striker 14 is reduced, and the service life of the plunger striker 14 is prolonged.

Introduction of the fixing ring 16: the plunger 14 is provided at its other end with a retaining ring 16. The fixing ring 16 is integrally formed with the other end of the plunger rod 14 or is connected thereto by welding. Optionally, the outer diameter of the fixing ring 16 matches the inner diameter of the first through hole.

In one possible implementation, the drainage plunger further comprises a wear ring 26; a wear ring 26 is provided on the outside of the fixed ring 16. Optionally, the material of the wear-resistant ring 26 is a wear-resistant metal alloy, such as chrome steel. The wear-resistant ring 26 is connected with the fixed ring 16 through welding. In the embodiment of the present application, the material of the wear-resistant ring 26 is not particularly limited, and may be set and modified as needed.

In the embodiment of the present application, since the wear-resistant ring 26 is disposed outside the fixing ring 16, the wear-resistant ring 26 can prolong the service life of the fixing ring 16 during the movement of the plunger 14 along the first through hole, and the fixing ring 16 is connected to the other end of the plunger 14, thereby avoiding the occurrence of replacement of the plunger 14 due to abrasion of the fixing ring 16, and improving the service life of the liquid discharge plunger.

Introduction of the stop collar 17: the stop collar 17 is disposed at the bottom end of the first through hole. The limiting ring 17 is connected with the bottom end of the first through hole through integral forming or welding. Wherein the inner diameter of the stop collar 17 matches the outer diameter of the plunger rod 14. And a stop collar 17 for limiting the distance the plunger 14 moves.

It should be noted that the stop collar 17 may limit the distance that the plunger 14 moves upward, or may limit the distance that the plunger 14 moves downward.

In a possible implementation manner, during the collision between the plunger firing pin 14 and the retainer at the bottom end of the shaft, the plunger firing pin 14 is moved upwards by the collision force, the shock absorbing member 15 is extended to provide elastic force to the fixing ring 16 through elastic deformation to buffer the impact force on the plunger firing pin 14, the limiting ring 17 is connected with the shock absorbing member 15, and the fixing ring 16 is provided with pulling force through the shock absorbing member 15, so that the distance that the plunger firing pin 14 moves upwards can be limited.

In another possible implementation manner, during the collision between the plunger firing pin 14 and the retainer at the top end of the shaft, the plunger firing pin 14 is moved downward by the collision force, the shock absorbing member 15 contracts, the elastic shape provides elastic force to the fixing ring 16 to buffer the impact force on the plunger firing pin 14, the limiting ring 17 is connected with the shock absorbing member 15, and the shock absorbing member 15 provides thrust to the fixing ring 16, so that the downward movement distance of the plunger firing pin 14 can be limited.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A drainage plunger for draining a fluid accumulation in a wellbore, the drainage plunger comprising: the plunger type plunger comprises a connecting piece (11), a mounting groove (12), a plunger body (13), a plunger firing pin (14), a damping piece (15), a fixing ring (16) and a limiting ring (17);

the connecting piece (11) and the plunger body (13) are arranged in the shaft, a groove is formed in the bottom end of the connecting piece (11), the mounting groove (12) is formed in the groove, the bottom end of the connecting piece (11) is connected with the top end of the plunger body (13) through the mounting groove (12), a first through hole is formed in the connecting piece (11), a second through hole is formed in the bottom of the mounting groove (12), a third through hole is formed in the plunger body (13), the first through hole, the second through hole and the third through hole are sequentially communicated, and one end of the plunger firing pin (14) sequentially penetrates through the first through hole, the second through hole and the third through hole;

the shock absorbing piece (15), the fixing ring (16) and the limiting ring (17) are arranged in the first through hole, the fixing ring (16) is arranged at the other end of the plunger firing pin (14), the limiting ring (17) is arranged at the bottom end of the first through hole, and the fixing ring (16) and the limiting ring (17) are connected through the shock absorbing piece (15);

in the process of discharging the accumulated liquid in the shaft through the liquid discharging plunger, the plunger body (13) is pushed by gas in the shaft to move upwards to carry the accumulated liquid in the shaft to move upwards until the accumulated liquid is discharged, in the process that the plunger firing pin (14) collides with the stopper, the shock absorption piece (15) provides elastic force for the fixing ring (16) to buffer the impact force received by the plunger firing pin (14) through the elastic force, and the limiting ring (17) is used for limiting the moving distance of the plunger firing pin (14).

2. The drain plug according to claim 1, characterized in that it further comprises a positioning block (18) and a positioning slot (19);

the side wall of the top end of the plunger body (13) is provided with an installation block, the positioning block (18) is arranged at the top end of the installation block, the positioning groove (19) is arranged on the end face of the notch of the installation groove (12), and the positioning groove (19) is matched with the positioning block (18);

in the process that the bottom end of the connecting piece (11) is connected with the top end of the plunger body (13) through the mounting groove (12), the positioning block (18) is connected with the positioning groove (19) and used for positioning the position of the plunger body (13) in the groove.

3. The drain plug according to claim 2, characterized in that it further comprises a fixing pin (20);

a pin groove (131) is formed in the mounting block, and a pin hole (111) is formed in a position, matched with the pin groove (131), in the groove at the bottom end of the connecting piece (11);

the fixing pin (20) penetrates through the pin hole (111) to be connected with the pin groove (131) and is used for connecting the connecting piece (11) with the top end of the plunger body (13).

4. The drain plug according to claim 3, characterized in that the fixing pin (20) comprises a pin rod (201) and a pin cap (202), and the pin rod (201) and the pin cap (202) are connected;

the pin rod (201) penetrates through the pin hole (111) to be connected with the pin groove (131), and the pin cap (202) is used for being connected with the connecting piece (11).

5. The drain plug according to claim 4, characterized in that it further comprises a fixing bolt (21), the connecting piece (11) is provided with a bolt groove (112), and the top end of the pin cap (202) is provided with a bolt hole (203);

the fixing bolt (21) penetrates through the bolt hole (203), is connected with the bolt groove (112) and is used for fixing the pin cap (202) and the connecting piece (11).

6. The drain plug according to claim 4, characterized in that it further comprises a slider (22), said slider (22) being arranged at one end of said pin rod (201), said pin hole (111) being provided with a slide groove (23) matching said slider (22);

during the installation of the pin rod (201), the slider (22) moves along the sliding slot (23) for cooperating with the sliding slot (23) to position the pin rod (201) in the pin hole (111).

7. The drain plug of claim 1, further comprising a guide rod (132);

the guide rod (132) is arranged on the end face of the top end of the plunger body (13), and a guide groove (121) matched with the guide rod (132) is formed in the inner wall of the mounting groove (12);

in the process that the bottom end of the connecting piece (11) is connected with the top end of the plunger body (13) through the mounting groove (12), the guide rod (132) slides in the guide groove (121) and is used for being matched with the guide groove (121) to position the position of the plunger body (13) in the groove.

8. The drain plug of claim 1, further comprising a first sealing ring (24);

the first sealing ring (24) is arranged at a notch of the mounting groove (12) and used for sealing a gap between the mounting groove (12) and the plunger body (13).

9. The drain plug according to claim 1, further comprising a second sealing ring (25);

the second sealing ring (25) is arranged between the limiting ring (17) and the plunger firing pin (14) and used for sealing a gap between the limiting ring (17) and the plunger firing pin (14).

10. The drain plunger of claim 1, further comprising a wear ring (26);

the wear ring (26) is arranged outside the fixing ring (16).