Swabbing device for liquid drainage and gas recovery of flooded gas well

Abstract

The swabbing device comprises a swabbing assembly, the swabbing assembly comprises a swabbing rod, the two ends of the swabbing rod are communicated, a flow channel is formed in the swabbing rod, a rubber sleeve is slidably arranged on a rubber sleeve sleeving section in a sleeving mode, and one end of the rubber sleeve can abut against the end face of a rubber sleeve limiting section in a sealed mode; the adjusting assembly comprises a pipe shell, one end of the pipe shell is connected to the end of the rubber sleeve limiting section and communicated with the flow channel of the drawing rod, an end cover is arranged at the other end of the pipe shell, a conical surface section with the large end facing the end cover is arranged on the inner wall of the pipe shell, and a valve assembly is movably arranged in the pipe shell. The valve assembly comprises a valve ball seat capable of being matched with the conical surface section, a valve ball arranged at the small end of the valve ball seat and a valve pipe connected to the large end of the valve ball seat, a first through hole is formed in the pipe wall of the valve pipe in a penetrating mode, and the valve pipe is sleeved with a first elastic piece enabling the valve ball seat to abut against the conical surface section. The invention aims to solve the problems that the resistance generated in the lowering process is large, swabbing overload occurs when lowering is too deep, and a tool string moves upwards due to pressure change.

Description

Technical Field

[0001] The invention belongs to the technical field of stable production of gas fields, and in particular relates to a pumping device used for draining liquid and producing gas in a flooded gas well. Background Art

[0002] In the middle and late stages of Changqing gas well production, there are generally problems of liquid accumulation and flooding. Some gas wells are seriously liquid-accumulated, resulting in shutdown, and conventional drainage and gas production processes cannot resume production. The wire-tight forced drainage recovery technology has the characteristics of high recovery success rate and input-output ratio, less damage to the process reservoir, and a wide range of technical applications. It can achieve low-yield gas wells with low cost, fast and safe recovery operations, and can better solve the problem of recovery of gas wells with serious liquid accumulation in the late stage of development.

[0003] The existing wire-tight forced drainage and recovery technology pumping tools on the market have pumping functions, but they generate large resistance during the lowering process, and when the pumping tool string is lowered too deep, pumping overload may occur, which cannot meet the safety of gas well operations and the requirements of refined drainage and gas production. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a pumping device for draining liquid and recovering gas in flooded gas wells, which aims to solve the problems of large resistance generated during the lowering of the pumping device, pumping overload when lowered too deep, and pressure changes causing the tool string to jump up.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] A pumping device for draining liquid and recovering gas from a flooded gas well, comprising:

[0007] The pumping assembly comprises a pumping rod with flow channels formed at both ends, the pumping rod comprises a rubber sleeve sleeve section and a rubber sleeve limiting section connected in sequence, a rubber sleeve is slidably sleeved on the rubber sleeve sleeve section, and one end of the rubber sleeve can be sealed against the end surface of the rubber sleeve limiting section;

[0008] An adjusting component comprises a tube shell having one end connected to the end of the rubber cylinder limiting section and communicated with the flow channel of the drawing rod, an end cover being provided at the other end of the tube shell, a conical section with a large end facing the end cover being provided on the inner wall of the tube shell, a valve assembly being movably arranged in the tube shell, the valve assembly comprising a valve ball seat capable of matching with the conical section, a valve ball arranged at the small end of the valve ball seat, and a valve tube connected to the large end of the valve ball seat and slidably matched with the end cover, a first through hole being formed through the tube wall of the valve tube, and a first elastic member for pressing the valve ball seat against the conical section is sleeved on the valve tube.

[0009] Furthermore, the pumping device also includes:

[0010] The anti-upward movement component includes a connecting rod, and a second elastic member, a damping claw hanging sleeve and a damping claw expansion sleeve which are sequentially sleeved on the connecting rod. The damping claw hanging sleeve is slidably matched with the small diameter section of the connecting rod and is pressed against the shaft shoulder by the second elastic member. A plurality of damping claws distributed along the circumference of the connecting rod are hung on the damping claw hanging sleeve. The outer wall of the damping claw expansion sleeve at one end facing the damping claw is wedge-shaped. The damping claw expansion sleeve can slide axially along the connecting rod and expand the plurality of damping claws outwardly by using the wedge surface. The other end of the damping claw expansion sleeve is connected to the end of the rubber sleeve section through a connecting head. The outer wall of the connecting head is provided with a second through hole which is connected to the flow channel of the withdrawal rod.

[0011] Furthermore, the anti-rising assembly also includes a fishing head, the fishing head is connected to the end of the small-diameter section of the connecting rod, and the second elastic member abuts against the fishing head.

[0012] Furthermore, the fishing head is threadedly connected to the connecting rod.

[0013] Furthermore, the connector is connected to the damping claw expansion sleeve via threads;

[0014] A countersunk hole is provided on the end face of the connecting head away from the damping claw expansion sleeve, and the countersunk hole includes a large hole and a small hole provided at the bottom of the large hole. The large hole of the countersunk hole is threadedly connected to the end of the rubber sleeve section, and the small hole of the countersunk hole is connected to the second through hole.

[0015] Furthermore, a plurality of guide grooves are distributed circumferentially on the rubber sleeve sleeve section.

[0016] Furthermore, the valve assembly also includes a valve ball anti-dropping cap connected to the small end of the valve ball seat, and a third through hole is opened on the end surface of the valve ball anti-dropping cap.

[0017] Furthermore, the valve ball anti-drop cap is connected to the small end of the valve ball seat through a thread.

[0018] Furthermore, the rubber sleeve limiting section is connected to the tube shell by threaded cooperation.

[0019] Furthermore, the tube shell is threadedly connected to the end cover.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The present invention provides a pumping device for draining and extracting gas from a flooded gas well. When the pumping device descends in the drainage wellbore, the liquid in the wellbore can enter from the lower end of the valve tube and push the valve ball on the valve ball seat upward, so that the fluid channel of the valve assembly is opened, and the liquid enters the flow channel of the pumping rod through the tube shell and is discharged from the other end of the flow channel of the pumping rod. Therefore, the lowering resistance of the pumping device can be effectively reduced, which is convenient for the tool string to fall quickly. When the pumping device ascends in the drainage wellbore, the valve ball on the valve ball seat falls to the valve ball seat, so that the fluid channel of the valve assembly is closed, and the liquid cannot flow downward through the flow channel of the pumping rod. Under the pressure of the liquid column on the upper part of the rubber tube and the action of the dynamic load, the lower end of the rubber tube is sealed against the end face of the rubber tube limit section, so that the rubber tube expands in the radial direction in a "waist drum" shape. After the rubber tube expands, it forms a seal with the inner wall of the wellbore oil pipe, and the liquid on the seal is discharged from the wellbore as the pumping device ascends. When the pumping device goes up in the drainage wellbore, the rubber sleeve forms a seal with the inner wall of the oil pipe. If the pumping device is overloaded due to being lowered too deep, the valve ball falls to the valve ball seat. When the liquid weight in the upper part of the seal formed by the rubber sleeve and the inner wall of the wellbore oil pipe is greater than the elastic force of the first elastic member, the valve assembly squeezes the first elastic member downward, that is, the valve ball seat originally pressed on the conical surface section by the first elastic member moves downward together, and a flow annulus is generated between the outer wall conical surface of the valve ball seat and the conical surface section. At this time, the liquid in the upper part of the seal formed by the rubber sleeve and the inner wall of the wellbore oil pipe passes through the pumping rod. The flow channel enters the upper part of the tube shell, and flows into the lower part of the tube shell through the flow annulus generated between the outer wall conical surface of the valve ball seat and the conical surface section, and then enters the valve tube through the first through hole on the wall of the valve tube, and finally is discharged to the bottom of the pumping device through the valve tube to achieve automatic unloading; continue to lift the pumping device pipe string until the overload situation is eliminated, that is, when the liquid weight of the upper part of the seal formed by the rubber tube and the inner wall of the wellbore oil pipe is less than the elastic force of the first elastic member, the first elastic member presses the valve ball seat against the conical surface section and the two match and seal, that is to say, the channel for liquid to flow downward is closed, and the liquid continues to be discharged. In summary, it can be seen that the present invention effectively solves the problem of large resistance generated during the lowering of the tool string of the pumping device and the problem of pumping overload when it is lowered too deep, and can achieve automatic unloading of overload, avoid the situation of pumping overload caused by the tool string being lowered too deep when the bottom hole liquid level depth is uncertain, and reduce the impact of accurate measurement of liquid level depth and precise control of tool string lowering depth on operation safety and pumping efficiency.

[0022] Furthermore, when a sudden increase in formation pressure causes a sudden increase in well pressure, and gas pushes up the tool string of the pumping device, when the damping claw expansion sleeve is subjected to a force greater than the predetermined elastic force of the second elastic member, the damping claw expansion sleeve, under the action of the upward force of the high-pressure gas, has an upward speed greater than the connecting rod, and then moves relative to the connecting rod, and the wedge surface of the damping claw expansion sleeve wedges into the damping claw, expanding several damping claws outward, thereby expanding the retracted damping claws to the inner wall of the oil pipe, and increasing the friction between the damping claws and the inner wall of the oil pipe to prevent the tool string from moving up.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A half-section schematic diagram of the overall structure of a pumping device for draining liquid and recovering gas in a flooded gas well according to an embodiment of the present invention;

[0026] Figure 2 A half-section schematic diagram of the overall structure of a pumping rod in a pumping device for draining liquid and recovering gas in a flooded gas well according to an embodiment of the present invention;

[0027] Figure 3 A half-section schematic diagram of the overall structure of a tube shell in a pumping device for draining liquid and recovering gas in a flooded gas well according to an embodiment of the present invention;

[0028] Figure 4 A half-section schematic diagram of the overall structure of a valve assembly in a pumping device for draining liquid and recovering gas in a flooded gas well according to an embodiment of the present invention;

[0029] Figure 5 Schematic diagram of a valve ball anti-drop cap in a pumping device for draining liquid and recovering gas in a flooded gas well according to an embodiment of the present invention, wherein (a) is a cross-sectional view and (b) is a top view;

[0030] Figure 6 A schematic half-section diagram of the overall structure of a connector in a pumping device for draining liquid and recovering gas from a flooded gas well according to an embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the mathematical model of the maximum expansion relationship of the damping claw in an embodiment of the present invention.

[0032] In the figure: 1- pumping assembly; 10- pumping rod; 10a- rubber tube sleeve section; 10a1- guide groove; 10b- rubber tube limit section; 11- rubber tube;

[0033] 2-adjustment assembly; 20-tube shell; 200-conical section; 21-end cover; 22-valve assembly; 220-valve ball seat; 221-valve tube; 221a-first through hole; 222-valve ball anti-drop cap; 222a-third through hole; 223-valve ball; 23-first elastic member;

[0034] 3-anti-upward component; 30-connecting rod; 31-second elastic member; 32-damping claw hanging sleeve; 33-damping claw expansion sleeve; 34-connecting head; 34a-second through hole; 35-fishing head; 36-damping claw. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, an embodiment of the present invention is a pumping device for draining liquid and recovering gas in a flooded gas well, comprising a pumping assembly 1 for scooping liquid out of the well and a regulating assembly 2 for regulating the opening and closing of a flow channel and adaptively regulating a load.

[0037] Combination Figure 2 As shown, the pumping assembly 1 includes a pumping rod 10 with flow channels opened at both ends, and the pumping rod 10 includes a rubber sleeve section 10a and a rubber sleeve limiting section 10b connected in sequence. The diameter of the rubber sleeve section 10a is smaller than the diameter of the rubber sleeve limiting section 10b. A rubber sleeve 11 is slidably sleeved on the rubber sleeve section 10a, and one end of the rubber sleeve 11 can be sealed against the end face of the rubber sleeve limiting section 10b.

[0038] It should be understood that the shape details of the pull rod 10 can be appropriately changed and adjusted according to the production and processing technology, and is not limited to the structure described in this embodiment. It only needs to satisfy that the rubber tube 11 can slide and one end of the rubber tube 11 can be sealed against the end face of the rubber tube limiting section 10b.

[0039] Combination Figure 3 and Figure 4 As shown, the adjustment assembly 2 includes a tube shell 20 connected at one end to the end of the rubber cylinder limiting section 10b and communicated with the flow channel of the pumping rod 10, an end cap 21 is provided at the other end of the tube shell 20, a conical section 200 with a large end facing the end cap 21 is provided on the inner wall of the tube shell 20, and a valve assembly 22 is movably arranged in the tube shell 20, the valve assembly 22 includes a valve ball seat 220 that can match the conical section 200, a valve ball 223 arranged at the small end of the valve ball seat 220, and a valve tube 221 connected to the large end of the valve ball seat 220 and slidably matched with the end cap 21, a first through hole 221a is opened through the tube wall of the valve tube 221, and a first elastic member 23 for pressing the valve ball seat 220 against the conical section 200 is sleeved on the valve tube 221. Exemplarily, the first elastic member 23 is a compression spring.

[0040] It should be noted that the elastic force of the first elastic member 23 is set according to the actual use condition of the pumping device. In addition, it should also be understood that the valve assembly 22 is formed with a flow channel along its axial direction as a whole.

[0041] Specifically, when the pumping device descends in the drainage wellbore, the liquid in the wellbore can enter from the lower end of the valve tube 221 and push up the valve ball 223 on the valve ball seat 220, so that the fluid channel of the valve assembly 22 is opened, and the liquid enters the flow channel of the pumping rod 10 through the tube shell 20 and is discharged from the other end of the flow channel of the pumping rod 10. Therefore, the lowering resistance of the pumping device can be effectively reduced, which facilitates the rapid drop of the tool string.

[0042] When the pumping device ascends in the drainage wellbore, the valve ball 223 on the valve ball seat 220 falls to the valve ball seat 220, so that the fluid channel of the valve assembly 22 is closed, and the liquid cannot flow downward through the flow channel of the pumping rod 10. Under the pressure of the liquid column on the upper part of the rubber cylinder 11 and the action of the dynamic load, the lower end of the rubber cylinder 11 is sealed against the end face of the rubber cylinder limit section 10b, so that the rubber cylinder 11 expands in a "waist drum" shape in the radial direction. After the expansion, the rubber cylinder 11 forms a seal with the inner wall of the wellbore oil pipe, and the liquid in the upper part of the seal is discharged from the wellbore as the pumping device ascends. The rubber cylinder 11 of this embodiment is a "whole cylinder" design, with a small amount of pumping leakage and a high pumping efficiency. For example, multiple pumping assemblies 1 can also be connected in series in sequence for combined use (just connect the pumping rods 10 of two adjacent pumping assemblies 1), with better sealing effect and higher pumping efficiency.

[0043] When the pumping device goes up in the drainage wellbore, the rubber cylinder 11 presses against the end face of the rubber cylinder limit section 10b under the action of the upper gas and liquid pressure and the dynamic load, and then gradually expands radially in a "waist drum" shape, and the gap with the inner wall of the oil pipe is reduced until a seal is formed. If the pumping device is overloaded due to being lowered too deep, the valve ball 223 falls to the valve ball seat 220. When the liquid weight at the upper part of the seal formed by the rubber cylinder 11 and the inner wall of the wellbore oil pipe is greater than the elastic force of the first elastic member 23, the valve assembly 22 squeezes the first elastic member 23 to move downward, that is, the valve ball seat 220 originally pressed on the conical section 200 by the first elastic member 23 moves downward therewith, and a flow annulus is generated between the outer wall conical surface of the valve ball seat 220 and the conical section 200. At this time, the rubber cylinder 11 The liquid in the upper part of the seal formed with the inner wall of the wellbore oil pipe enters the upper part of the tube shell 20 through the flow channel of the pumping rod 10, and flows into the lower part of the tube shell 20 through the flow annulus generated between the outer wall conical surface of the valve ball seat 220 and the conical surface section 200, and then enters the valve tube 221 through the first through hole 221a on the wall of the valve tube 221, and finally is discharged to the bottom of the pumping device through the valve tube 221 to achieve automatic unloading; continue to lift the pumping device pipe string until the overload condition is eliminated, that is, when the weight of the liquid in the upper part of the seal formed by the rubber sleeve 11 and the inner wall of the wellbore oil pipe is less than the elastic force of the first elastic member 23, the first elastic member 23 presses the valve ball seat 220 against the conical surface section 200 and the two are matched and sealed, that is to say, the channel for the liquid to flow downward is closed, and the discharge continues.

[0044] Preferably, a sealing ring is installed on the outer conical surface of the valve ball seat 220. When the valve ball seat 220 is in contact with the conical surface section 200, the sealing ring can better achieve a sealing effect to prevent leakage from affecting the drainage efficiency.

[0045] In one embodiment, due to the harsh downhole production environment, there are some uncertain factors, such as abnormal formation pressure, which exceeds the wellhead control range. This may be caused by excessive accumulation of natural gas pressure in the formation, pressure escape caused by formation cracks, or formation abnormalities. This situation will cause the tool string of the pumping device to move up seriously during the operation, which will seriously affect the operation quality and cause safety problems such as the tool string rushing out of the wellhead. Therefore, for the tool string moving up caused by abnormal downhole pressure, such as Figure 1 As shown, the pumping device also includes an anti-upward component 3 for preventing a sudden increase in well pressure caused by a sudden increase in formation pressure, which may cause gas to rise to the top of the pumping device tool string. The anti-upward component is one of the important mechanisms of the entire tool string to achieve safe water drainage and gas production functions. The reliability of this mechanism seriously affects the safety of personnel and equipment on and below the well during the entire oil production process.

[0046] In this embodiment, the anti-upward movement component 3 includes a connecting rod 30, and a second elastic member 31, a damping claw mounting sleeve 32 and a damping claw expansion sleeve 33 which are sequentially mounted on the connecting rod 30. The damping claw mounting sleeve 32 is slidably matched with the small diameter section of the connecting rod 30 and is pressed against the shaft shoulder by the second elastic member 31. A plurality of damping claws 36 distributed circumferentially along the connecting rod 30 are mounted on the damping claw mounting sleeve 32. The outer wall of the damping claw expansion sleeve 33 at one end facing the damping claw 36 is wedge-shaped. The damping claw expansion sleeve 33 can slide axially along the connecting rod 30 and use the wedge surface to expand the plurality of damping claws 36 outward. The other end of the damping claw expansion sleeve 33 is connected to the end of the rubber sleeve segment 10a through a connector 34. The outer wall of the connector 34 is provided with a second through hole 34a which is connected to the flow channel of the withdrawal rod 10. Exemplarily, the second elastic member 31 adopts a compression spring, and is hung with three damping claws 36, which are hung in the damping claw hanging sleeve 32 at 120 degrees. It should be noted that the elastic force of the second elastic member 31 is set to be greater than the resistance encountered by the wire operation, and multiple damping claws 36 are placed at the large diameter of the connecting rod 30. When multiple damping claws 36 are evenly hung in the damping claw hanging sleeve 32 to maintain a retracted state, their outer diameter is not greater than the maximum outer diameter of the steel body.

[0047] Specifically, when a sudden increase in formation pressure causes a sudden increase in well pressure and gas pushes up the tool string of the pumping device, when the force applied to the damping claw expansion sleeve 33 is greater than the predetermined elastic force of the second elastic member 31, the damping claw expansion sleeve 33, under the action of the upward force of the high-pressure gas, has an upward speed greater than the connecting rod 30, and then moves relative to the connecting rod 30, and the wedge surface of the damping claw expansion sleeve 33 wedges into the damping claw 36, expanding a plurality of damping claws 36 outward, thereby expanding the retracted damping claws 36 to the inner wall of the oil pipe, and increasing the friction between the damping claws 36 and the inner wall of the oil pipe to prevent the tool string from moving upward. When the top pressure is released, the damping claw expansion sleeve 33 and the following parts lose support and move down along the connecting rod 30 under the action of gravity, and the wedge surface of the damping claw expansion sleeve 33 withdraws from under the damping claw 36. The expanded damping claw 36 loses support and is retracted, and the wire rope can continue to be lifted, so that the damping claw 36 moves up and retracts relative to the damping claw expansion sleeve 33 (wedge surface), releasing the anchor. In addition, the second elastic member 31 can also prevent the damping claw from accidentally starting when there is slight resistance during the lowering process, and has a certain ability to release the jam when encountering resistance. At the same time, it can buffer the shock force of the upper jar when the tool is accidentally stuck.

[0048] Preferably, a limiting boss is provided on the inner wall of the damping claw expansion sleeve 33, and one end of the connecting rod 30 inserted into the damping claw expansion sleeve 33 is threadedly connected to a limiting ring. The limiting ring cooperates with the limiting boss to achieve limitation between the damping claw expansion sleeve 33 and the connecting rod 30. The two can both undergo relative displacement and achieve limitation after the set displacement, thereby ensuring a sliding connection between the two.

[0049] Exemplarily, the damping claw hanging sleeve 32 includes a hanging sleeve and a damping block fixing joint connected to the hanging sleeve by screws, which facilitates the installation of the damping claw 36. The damping claw 36 is hung in the hanging sleeve, and a gap is set between the damping claw 36 and the hanging sleeve to ensure that the damping claw 36 expands outward.

[0050] For example, the damping claw 36 has a tooth angle of 45°, which further increases the force between the damping claw 36 and the oil pipe and improves the reliability of preventing the tool string from running up.

[0051] For example, the structural design of the damping claw is as follows: Figure 7 As shown in the figure, a relevant mathematical model is established to analyze the relationship between the maximum expansion diameter of the damping claw, the upward movement distance of the damping claw expansion sleeve, and the expansion angle of the damping claw expansion sleeve, so as to indirectly judge the rationality of the structure. Specifically, the maximum expansion diameter of the damping claw is the point that first contacts the oil pipe wall, that is, point A, D is the upward movement distance of the damping claw expansion sleeve, θ is the expansion angle of the damping claw expansion sleeve, h is the front end height of the damping claw expansion sleeve, and h 1 It is the vertical height of the front end of the damping claw.

[0052] In one embodiment, if Figure 1 As shown, the anti-upward component 3 also includes a fishing head 35, which is connected to the end of the small diameter section of the connecting rod 30, and the second elastic member 31 is against the fishing head 35. That is to say, the fishing head 35 is used to realize the connection with the ground device through the wire rope. Specifically, the rope cap head, the weight rod, the jar, the hand-release tool pumping device and the weight rod are pre-connected in sequence on the ground, and the ground winch is used as the power to pull the above-mentioned connection body through the high-strength steel wire and the connecting rope cap, and reciprocate up and down in the oil pipe, so as to quickly empty the accumulated liquid in the wellbore in a short time, so that the gas well with productivity can quickly resume production.

[0053] Preferably, an internal thread hole is provided on the end surface of the fishing head 35 , and an external thread is provided on the outer wall of one end of the connecting rod 30 facing the fishing head 35 , and the fishing head 35 is threadedly connected to the connecting rod 30 .

[0054] In one embodiment, the connector 34 is connected to the damping claw expansion sleeve 33 by threads. Figure 6 As shown, a countersunk hole is provided on the end surface of the connector 34 away from the damping claw expansion sleeve 33. The countersunk hole includes a large hole and a small hole provided at the bottom of the large hole. The large hole of the countersunk hole is threadedly connected to the end of the rubber sleeve section 10a, and the small hole of the countersunk hole is connected to the second through hole 34a. Specifically, the second through hole 34a radially connects the small hole of the countersunk hole with the outside of the tool. The liquid enters the small hole of the countersunk hole through the second through hole 34a and then enters the flow channel of the pumping rod 10. Alternatively, the liquid enters the small hole of the countersunk hole from the flow channel of the pumping rod 10 and then is discharged through the second through hole 34a.

[0055] As a more preferred embodiment, Figure 1 and Figure 2 As shown, a plurality of guide grooves 10a1 are distributed circumferentially on the rubber sleeve section 10a of the pumping rod 10. Specifically, when the pumping device is moving downward, the rubber sleeve 11 will move upward due to the friction force, that is, it will be separated from the end face of the rubber sleeve limiting section 10b. When the lower end of the rubber sleeve 11 moves upward to the position of the guide groove 10a1, the liquid can also flow through the guide groove 10a1, which can better reduce the downward resistance of the pumping device.

[0056] In one embodiment, in combination Figure 1 and Figure 5 As shown, the valve assembly 22 also includes a valve ball anti-detachment cap 222 connected to the small end of the valve ball seat 220, and a third through hole 222a is provided on the end face of the valve ball anti-detachment cap 222. The valve ball anti-detachment cap 222 can effectively limit the valve ball 223 to prevent the valve ball 223 from detaching from the valve ball seat 220, thereby ensuring the reliability of the device operation.

[0057] Preferably, the inner wall of the valve ball anti-drop cap 222 is provided with an internal thread, the small end of the valve ball seat 220 is provided with an external thread, and the valve ball anti-drop cap 222 is connected to the small end of the valve ball seat 220 through threads.

[0058] In one embodiment, an internal thread hole is provided at the end of the rubber cylinder limiting section 10 b , and an end of the tube shell 20 facing the end of the rubber cylinder limiting section 10 b is provided with an external thread, and the rubber cylinder limiting section 10 b is threadedly connected to the tube shell 20 .

[0059] In one embodiment, an inner wall of one end of the tube shell 20 away from the end of the rubber cylinder limiting section 10 b is provided with an internal thread, and the end cover 21 is provided with an external thread, and the tube shell 20 and the end cover 21 are threadedly connected.

[0060] In one embodiment, the second through hole 34a of the connector 34, the flow channel of the pumping rod 10, the third through hole 222a of the valve ball anti-drop cap 222, the flow annulus generated between the outer wall conical surface of the valve ball seat 220 and the conical surface section 200, the flow channel of the valve tube 221 and the flow area of ​​the gas-liquid flow channel of the first through hole 221a are equal.

[0061] The pumping device tool string is lowered without encountering any resistance or the resistance encountered is less than the set force of the second elastic member 31, the damping claw 36 remains in a retracted state, the valve ball 223 pushes up the valve ball anti-dropping cap 222, the gas and liquid passage formed by the flow channel of the valve assembly 22, the third through hole 222a of the valve ball anti-dropping cap 222, the flow channel of the pumping rod 10 and the second through hole 34a of the connector 34 is opened, the rubber cylinder 11 moves upward due to the friction force to a predetermined drainage depth, the pumping device tool string is lifted up, the valve ball 223 sits in the valve ball seat 220, the central fluid passage of the pumping device is closed, the rubber cylinder 11 presses down against the end face of the rubber cylinder limiting section 10b of the pumping rod 10 under the action of the upper gas and liquid pressure and dynamic load, and then gradually expands radially in a "waist drum" shape, and the gap with the inner wall of the oil pipe is reduced until a sealed liquid column is formed.

[0062] The present invention also comprehensively solves the problems of poor safety, high operating risks, insufficient liquid carrying capacity and low operating efficiency of existing tools, and can be used to achieve low-yield gas wells to resume production quickly and safely at low cost.

[0063] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A pumping device for draining liquid and recovering gas from a flooded gas well, characterized in that: include: A pumping assembly (1) comprises a pumping rod (10) with flow channels formed at both ends, the pumping rod (10) comprising a rubber sleeve section (10a) and a rubber sleeve limiting section (10b) connected in sequence, a rubber sleeve (11) being slidably sleeved on the rubber sleeve section (10a), and one end of the rubber sleeve (11) being capable of sealing against an end surface of the rubber sleeve limiting section (10b); The regulating assembly (2) comprises a tube shell (20) having one end connected to the end of the rubber cylinder limiting section (10b) and communicating with the flow channel of the draw rod (10); the other end of the tube shell (20) is provided with an end cover (21); the inner wall of the tube shell (20) is provided with a conical section (200) with the large end facing the end cover (21); a valve assembly (22) is movably arranged in the tube shell (20); the valve assembly (22) comprises a valve that can be matched with the conical section (200); A valve ball seat (220), a valve ball (223) arranged at the small end of the valve ball seat (220), and a valve tube (221) connected to the large end of the valve ball seat (220) and slidably matched with the end cover (21), wherein a first through hole (221a) is formed through the tube wall of the valve tube (221), and a first elastic member (23) is sleeved on the valve tube (221) for pressing the valve ball seat (220) against the conical section (200).

2. A pumping device for draining liquid and recovering gas from a flooded gas well according to claim 1, characterized in that: The pumping device also includes: The anti-upward movement assembly (3) comprises a connecting rod (30), and a second elastic member (31), a damping claw hanging sleeve (32) and a damping claw expansion sleeve (33) which are sequentially sleeved on the connecting rod (30), wherein the damping claw hanging sleeve (32) is slidably matched with the small diameter section of the connecting rod (30) and is pressed against the shaft shoulder by the second elastic member (31), and a plurality of damping claws (36) distributed along the circumference of the connecting rod (30) are hung on the damping claw hanging sleeve (32), and the damping claw expansion sleeve (33) is provided with a plurality of damping claws (36) which are distributed along the circumference of the connecting rod (30). The outer wall of one end of the claw expansion sleeve (33) facing the damping claw (36) is in the form of a wedge surface. The damping claw expansion sleeve (33) can slide axially along the connecting rod (30) and use the wedge surface to expand a plurality of the damping claws (36) outward. The other end of the damping claw expansion sleeve (33) is connected to the end of the rubber sleeve section (10a) via a connector (34). The outer wall of the connector (34) is provided with a second through hole (34a) that is in communication with the flow channel of the draw rod (10).

3. A pumping device for draining liquid and recovering gas from a flooded gas well according to claim 2, characterized in that: The anti-upward movement assembly (3) further comprises a fishing head (35), wherein the fishing head (35) is connected to the end of the small-diameter section of the connecting rod (30), and the second elastic member (31) abuts against the fishing head (35).

4. A pumping device for draining liquid and recovering gas from a flooded gas well according to claim 3, characterized in that: The fishing head (35) is threadedly connected to the connecting rod (30).

5. The pumping device for draining liquid and recovering gas from a flooded gas well according to claim 2, characterized in that: The connecting head (34) is connected to the damping claw expansion sleeve (33) via threads; A countersunk hole is provided on the end surface of the connector (34) facing away from the damping claw expansion sleeve (33), wherein the countersunk hole comprises a large hole and a small hole provided at the bottom of the large hole, the large hole of the countersunk hole is threadedly connected to the end of the rubber sleeve sleeve section (10a), and the small hole of the countersunk hole is connected to the second through hole (34a).

6. The pumping device for draining liquid and recovering gas from a flooded gas well according to claim 1, characterized in that: A plurality of guide grooves (10a) (1) are distributed along the circumferential direction on the rubber sleeve sleeve section (10a).

7. A pumping device for draining liquid and recovering gas from a flooded gas well according to claim 1, characterized in that: The valve assembly (22) further comprises a valve ball anti-drop cap (222) connected to the small end of the valve ball seat (220), and a third through hole (222a) is provided on the end surface of the valve ball anti-drop cap (222).

8. A pumping device for draining liquid and recovering gas from a flooded gas well according to claim 7, characterized in that: The valve ball anti-drop cap (222) is connected to the small end of the valve ball seat (220) via a thread.

9. The pumping device for draining liquid and recovering gas from a flooded gas well according to claim 1, characterized in that: The rubber cylinder limiting section (10b) is threadably connected to the tube shell (20).

10. The pumping device for draining liquid and recovering gas from a flooded gas well according to claim 1, characterized in that: The tube shell (20) is threadedly connected to the end cover (21).

Images