阅读说明：本技术 一种具有增油增产作用的多功能助抽器 (Multifunctional pumping aid with oil increasing and yield increasing functions ) 是由 魏良艳 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种具有增油增产作用的多功能助抽器,涉及抽油泵助抽装置技术领域,所述的助抽器：包括活塞筒壳体,活塞筒壳体包括外筒和内筒,外筒与内筒密封连接后内部围成密封空间,密封空间包括两个腔室,其中一个腔室为内筒与外筒之间的环形腔,另一个腔室为内筒的内腔,两个腔室上下连通；内筒的内腔包括扩径腔和缩径腔,扩径腔内滑动密封设置有上活塞,上活塞上端连接有上杆,缩径腔内滑动密封设置有下活塞,下活塞下端连接有下杆,将上活塞的截面面积称为S1,下活塞的截面面积称为S2,上活塞与上杆的截面面积差称为S3,下活塞与下杆的截面面积差称为S4,则S1/S2＝S3/S4,其中S1大于S2。本发明增大抽油泵的行程从而达到增油增产的目的。(The invention discloses a multifunctional pumping aid with oil increasing and yield increasing effects, and relates to the technical field of pumping aids of oil well pumps, wherein the pumping aid comprises the following components in parts by weight: the piston cylinder comprises a piston cylinder shell, wherein the piston cylinder shell comprises an outer cylinder and an inner cylinder, the inner part of the outer cylinder and the inner cylinder are enclosed to form a sealed space after being connected in a sealing manner, the sealed space comprises two chambers, one chamber is an annular cavity between the inner cylinder and the outer cylinder, the other chamber is an inner cavity of the inner cylinder, and the two chambers are communicated up and down; the inner cavity of the inner cylinder comprises an expanding cavity and a reducing cavity, an upper piston is arranged in the expanding cavity in a sliding sealing mode, the upper end of the upper piston is connected with an upper rod, a lower piston is arranged in the reducing cavity in a sliding sealing mode, the lower end of the lower piston is connected with a lower rod, the sectional area of the upper piston is named as S1, the sectional area of the lower piston is named as S2, the difference between the sectional areas of the upper piston and the upper rod is named as S3, the difference between the sectional areas of the lower piston and the lower rod is named as S4, S1/S2 is named as S3/S4, and S1 is larger than S2. The invention increases the stroke of the oil pump so as to achieve the purpose of increasing oil and increasing yield.)

1. A multifunctional pumping aid with oil increasing and yield increasing effects is characterized in that: the oil pipe column oil-passing device comprises a piston cylinder shell, wherein the piston cylinder shell is axially and relatively fixedly connected with an oil pipe column through a connecting part, and an oil-passing gap is reserved between the piston cylinder shell and the oil pipe column; the piston cylinder shell comprises an outer cylinder (1) and an inner cylinder (4), the outer cylinder (1) is sleeved on the outer side of the inner cylinder (4) and is in sealing connection with the inner cylinder (4), a sealing space is enclosed by the inner part of the outer cylinder and the inner part of the inner cylinder after the outer cylinder and the inner cylinder are in sealing connection, the sealing space comprises two chambers, one chamber is an annular chamber (14) between the inner cylinder (4) and the outer cylinder (1), the other chamber is an inner chamber of the inner cylinder (4), the two chambers are filled with liquid, and the side walls of the inner cylinder (4) corresponding to the upper end and the lower end of the annular chamber (14) are respectively provided with a hole for communicating the two chambers; the inner cavity of the inner cylinder (4) comprises an expanding cavity (15) positioned at the upper part and a reducing cavity (12) positioned at the lower part, the expanding cavity (15) is internally provided with an upper piston (3) in a sliding sealing manner, the upper end of the upper piston (3) is connected with an upper rod (2), the upper end of the upper rod (2) extends out of the piston cylinder shell and is matched with the piston cylinder shell in a sliding sealing manner, the reducing cavity (12) is internally provided with a lower piston (5) in a sliding sealing manner, the lower end of the lower piston (5) is connected with a lower rod (6), and the lower end of the lower rod (6) extends out of the piston cylinder shell and is matched with the piston cylinder shell in a sliding sealing manner; for the convenience of distinguishing, the sectional area of the upper piston (3) is called S1, the sectional area of the lower piston (5) is called S2, the difference between the sectional areas of the upper piston (3) and the upper rod (2) is called S3, the difference between the sectional areas of the lower piston (5) and the lower rod (6) is called S4, S1/S2 is called S3/S4, and S1 is larger than S2.

2. The multifunctional pumping aid with oil increasing and production increasing effects according to claim 1, characterized in that: adapting unit include oil pipe short circuit (13) and elastic block (9), oil pipe short circuit (13) concatenate in the oil pipe tubular column, piston barrel casing outer wall have and be used for holding the mounting groove of elastic block (9), be provided with the spring between elastic block (9) and the piston barrel casing, elastic block (9) have the trend of keeping away from the piston barrel casing under the elastic reaction of spring, elastic block (9) one side of keeping away from the piston barrel casing has connecting groove (8), the upper portion of oil pipe short circuit (13) inner wall have axial direction guide slide, the lower part of oil pipe short circuit inner wall has circumferential direction slide, axial direction guide slide and circumferential direction slide intercommunication, have connecting protrusion (7) in the direction slide of circumference, connecting protrusion (7) shape and the shape phase-match of connecting groove (8), thereby restrict elastic block (9) production oil pipe footpath through rotatory messenger connecting protrusion (7) entering connecting groove (8) in restriction elastic block (9) Displacement in the direction of the axis; the torque can be transmitted between the upper rod (2) and the piston cylinder shell.

3. The multifunctional pumping aid with oil increasing and production increasing effects according to claim 2, characterized in that: a flared opening is arranged above the axial guide slideway, so that the elastic block (9) can conveniently enter the axial guide slideway; one end of the circumferential guide slideway is provided with a flaring, so that the elastic block (9) can conveniently enter the circumferential guide slideway.

4. The multifunctional pumping aid with oil increasing and production increasing effects according to any one of claims 2 or 3, characterized in that: the upper end surface and the lower end surface of the elastic block (9) are inclined surfaces, so that the elastic block (9) is prevented from being blocked when the sucker rod string is lifted up or lowered down.

5. The multifunctional pumping aid with oil increasing and production increasing effects according to claim 1, characterized in that: the connecting component comprises an oil pipe short circuit (13) and a friction block (20), the oil pipe short circuit (13) is connected in series in an oil pipe column, the outer wall of a piston cylinder shell is fixedly sleeved with two short circuits (17) which are arranged up and down, the outer sides of the two short circuits (17) are provided with threads, the thread screwing directions of the outer sides of the two short circuits (17) are opposite, the friction block (20) is arranged on the piston cylinder shell between the two short circuits (17), a spring is arranged between the friction block (20) and the piston cylinder shell, the friction block (20) has a trend of being far away from the piston cylinder shell under the elastic force action of the spring, the outer sides of the two short circuits (17) are respectively screwed with friction block pressing caps (18), the friction block pressing caps (18) extend between the two adjacent friction blocks (20), the outer sides of the friction block pressing caps (20) are sleeved with limiting sleeves (19), and ejection springs (22) which are axially telescopic are arranged between the limiting sleeves (19) and the pressing caps (18), the limiting sleeve (19) has a tendency of being close to the friction block (20) under the action of the elastic force of the ejection spring (22), the upper end and the lower end of the friction block (20) are respectively provided with a limiting groove (21) matched with the limiting sleeve (19), the inner wall of the oil pipe short joint (13) is provided with a limiting concave ring (23) used for limiting the friction block (20) to move up and down, the friction block (20) moves away from the piston cylinder shell after reaching the inside of the limiting concave ring (23) in the downward process, and the limiting sleeve (19) enters the limiting groove (21) so as to limit the friction block (20) to generate radial displacement of the oil pipe; a step (24) for limiting the limiting sleeve (19) is arranged on the outer side of one end of the friction block pressing cap (18) close to the friction block (20); the torque can be transmitted between the upper rod (2) and the piston cylinder shell.

6. The multifunctional pumping aid with the oil increasing and the production increasing functions as claimed in claim 5, wherein the two short joints (17) are respectively in interference fit with the piston cylinder shell and connected through anti-rotation nails.

7. The multifunctional pumping aid with oil increasing and production increasing effects according to any one of claims 5 or 6, wherein the upper end face and the lower end face of the friction block (20) are both inclined surfaces, so that the friction block (20) is prevented from being blocked when a sucker rod string is lifted up or lowered down.

Technical Field

The invention belongs to the technical field of oil well pump pumping-assisting devices, and particularly relates to a multifunctional pumping-assisting device with oil increasing and yield increasing functions.

Background

The oil well pumping aid is one auxiliary pumping unit for raising pump efficiency, and has one check valve set in the central passage of the pumping aid body, oil extracting piston set outside the pumping aid body and sliding sealing fit with the oil pipe, so that the liquid column pressure acting on the plunger of the oil pump is shared by the oil extracting pistons of the pumping aids serially connected to the pumping rod, and this can reduce the hydraulic pressure difference between the upper and lower sides of the plunger, reduce the leakage of the pump and raise the yield.

It can be seen from the above that the pumping aid mechanism of the existing pumping aid is realized by a leakage reduction mode, and the leakage reduction can only enable the actual pumping capacity to be closer to the pumping capacity in a theoretical state (the pumping capacity in the theoretical state is the product of the stroke of the sucker rod string and the cross section of the pump piston), that is, the existing pumping aid can only avoid loss, can not really lift the pumping capacity, and can not increase oil and increase production.

Disclosure of Invention

The invention provides a multifunctional pumping aid with oil increasing and production increasing functions, which is connected to the lower end of a sucker rod string and the upper end of a piston rod, can change displacement while transmitting axial displacement, amplifies the displacement of a pump piston, and enables the displacement stroke of the pump piston to be larger than that of the sucker rod string, so that the pumping output of an oil well pump is increased by using the multifunctional pumping aid under the condition of unchanged displacement of the sucker rod string, and the aim of oil increasing and production increasing is fulfilled.

The technical scheme provided by the invention is as follows: a multifunctional pumping aid with oil increasing and yield increasing effects comprises a piston cylinder shell, wherein the piston cylinder shell is axially and relatively fixedly connected with an oil pipe column through a connecting component, and an oil passing gap is reserved between the piston cylinder shell and the oil pipe column; the piston cylinder shell comprises an outer cylinder and an inner cylinder, the outer cylinder is sleeved on the outer side of the inner cylinder and is in sealing connection with the inner cylinder, a sealing space is enclosed by the inner cylinder after the outer cylinder and the inner cylinder are in sealing connection, the sealing space comprises two chambers, one chamber is an annular chamber between the inner cylinder and the outer cylinder, the other chamber is an inner chamber of the inner cylinder, the two chambers are filled with liquid, and the inner cylinder side walls corresponding to the upper end and the lower end of the annular chamber are respectively provided with a hole for communicating the two chambers; the inner cavity of the inner cylinder comprises an expanding cavity positioned at the upper part and a contracting cavity positioned at the lower part, an upper piston is arranged in the expanding cavity in a sliding sealing manner, the upper end of the upper piston is connected with an upper rod, the upper end of the upper rod extends out of the piston cylinder shell and is matched with the piston cylinder shell in a sliding sealing manner, a lower piston is arranged in the contracting cavity in a sliding sealing manner, the lower end of the lower piston is connected with a lower rod, and the lower end of the lower rod extends out of the piston cylinder shell and is matched with the piston cylinder shell in a sliding sealing manner; for the sake of convenience of distinction, the cross-sectional area of the upper piston is referred to as S1, the cross-sectional area of the lower piston is referred to as S2, the difference between the cross-sectional areas of the upper piston and the upper rod is referred to as S3, and the difference between the cross-sectional areas of the lower piston and the lower rod is referred to as S4, then S1/S2 is referred to as S3/S4, where S1 is greater than S2.

The further technical scheme is as follows: the connecting part comprises an oil pipe short joint and an elastic block, the oil pipe short joint is connected in series in an oil pipe column, the outer wall of the piston cylinder shell is provided with an installation groove used for containing the elastic block, a spring is arranged between the elastic block and the piston cylinder shell, the elastic block has a trend of being far away from the piston cylinder shell under the elastic action of the spring, one side of the elastic block far away from the piston cylinder shell is provided with a connecting groove, the upper part of the inner wall of the oil pipe short joint is provided with an axial guide slideway, the lower part of the inner wall of the oil pipe short joint is provided with a circumferential guide slideway, the axial guide slideway is communicated with the circumferential guide slideway, a connecting bulge is arranged in the circumferential guide slideway, the shape of the connecting bulge is matched with that of the connecting groove, and the connecting bulge enters the connecting groove through rotation so as to limit the elastic block to generate radial displacement of the oil pipe; torque can be transmitted between the upper rod and the piston cylinder shell; the flaring is arranged above the axial guide slideway, so that the elastic block can conveniently enter the axial guide slideway; one end of the circumferential guide slideway is provided with a flared opening, so that the elastic block can conveniently enter the circumferential guide slideway; the upper end surface and the lower end surface of the elastic block are inclined planes, so that the elastic block is prevented from being blocked when the sucker rod string is lifted up or lowered down.

The further technical scheme is as follows: the connecting component comprises an oil pipe short circuit and a friction block, the oil pipe short circuit is connected in series in an oil pipe column, the outer wall of the piston cylinder shell is fixedly sleeved with two short circuits which are arranged up and down, the outer sides of the two short circuits are both provided with threads, the thread turning directions of the outer sides of the two short circuits are opposite, the friction block is arranged on the piston cylinder shell between the two short circuits, a spring is arranged between the friction block and the piston cylinder shell, the friction block has a trend of being far away from the piston cylinder shell under the elastic action of the spring, the outer sides of the two short circuits are respectively screwed with a pressing cap, the pressing cap extends between the two adjacent friction blocks, the outer side of the pressing cap is sleeved with a limiting sleeve, an ejection spring with an axial extension of the oil pipe is arranged between the limiting sleeve and the pressing cap, the limiting sleeve has a trend of being close to the friction block under the elastic action of the ejection spring, and the upper end and the lower end of the friction block are respectively provided with a limiting groove matched with the limiting sleeve, the inner wall of the oil pipe short joint is provided with a limiting concave ring for limiting the friction block to move up and down, the friction block moves away from the piston cylinder shell after arriving in the limiting concave ring in the process of moving down, and the limiting sleeve enters the limiting groove so as to limit the friction block to generate radial displacement of the oil pipe; a step for limiting the limiting sleeve is arranged on the outer side of one end of the pressing cap close to the friction block; torque can be transmitted between the upper rod and the piston cylinder shell; the two short circuits are respectively in interference fit with the piston cylinder shell and connected through anti-rotation nails; the upper end face and the lower end face of the friction block are inclined planes, so that the friction block is prevented from being blocked when the sucker rod string is lifted up or lowered down.

The invention has the beneficial effects that:

(1) compared with the structural principle of the existing pumping aid, the oil increasing and production increasing principle of the invention is realized by increasing the stroke of the plunger pump, the ratio of the cross-sectional area S1 of the upper piston to the cross-sectional area S2 of the lower piston in the invention is equal to the ratio of the cross-sectional area difference S3 of the upper piston and the upper rod to the cross-sectional area difference S4 of the lower piston and the lower rod, wherein S1 is greater than S2, so that after the displacement is transmitted by the invention, the moving displacement of the plunger is greater than that of the sucker rod, and the oil well pump can increase oil and produce production.

(2) The connecting part can be quickly connected with the oil pipe short circuit to enable the piston cylinder shell to be axially and fixedly connected with the oil pipe column, and can also be quickly disconnected from the oil pipe short circuit to enable the piston cylinder shell to be disconnected from the oil pipe.

(3) The connecting part of the invention is equivalent to the righting body arranged on the outer side of the piston cylinder shell, so that the invention has the functions of strengthening oil and increasing production.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic configuration diagram of a first embodiment of the connecting member in the present invention.

Figure 3 is a development of the inner surface of the oil pipe short circuit in a first embodiment of the connecting member according to the invention.

Fig. 4 is a schematic configuration diagram of a second embodiment of the connecting member in the present invention.

Fig. 5 is a schematic view of an installation structure of a pressing cap and a friction block in a second embodiment of a coupling member in the present invention.

In the figure: 1. an outer cylinder; 2. a rod is arranged; 3. an upper piston; 4. an inner barrel; 5. a lower piston; 6. a lower rod; 7. a connecting projection; 8. a connecting groove; 9. an elastic block; 10. pressing the cap by the elastic block; 11. a lower chamber; 12. a reducing cavity; 13. oil pipe short circuit; 14. an annular cavity; 15. a diameter expanding cavity; 16. an upper chamber; 17. short-circuit connection; 18. pressing a cap by a friction block; 19. a limiting sleeve; 20. a friction block; 21. a limiting groove; 22. ejecting a spring; 23. a limit concave ring; 24. and (4) a step.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the present invention also needs to be used in conjunction with the existing pumping aid, and when in use, the existing pumping aid can be installed in the sucker rod string above the present invention. If the existing pumping aid is not matched, the force for lifting the piston is necessarily larger, the tensile force borne by the lower rod 6 is necessarily larger, the diameter requirement of the lower rod 6 cannot be lower than that of the existing sucker rod under the condition that the material is not greatly broken through, however, the piston cylinder shell is required on the outer side of the lower rod 6 in the invention, so the diameter cannot be too large, the diameter of the lower rod 6 in the invention can be smaller than that of the sucker rod, because the lower rod can not necessarily bear larger tensile force, and the existing pumping aid is also required to be matched when the pumping aid is used.

The first embodiment is as follows:

according to the embodiments shown in fig. 1-2, the present invention provides a multifunctional pumping aid with oil increasing and production increasing effects, which comprises a piston cylinder housing, wherein the piston cylinder housing is axially and relatively fixedly connected with an oil pipe string through a connecting component, that is, the piston cylinder housing is connected to the oil pipe string through the connecting component and does not move up and down relative to the oil pipe string.

An oil passing gap is reserved between the piston cylinder shell and the oil pipe column, and crude oil lifted by the oil well pump plunger continuously moves upwards through the oil passing gap. The piston cylinder shell comprises an outer cylinder 1 and an inner cylinder 4, the outer cylinder 1 is sleeved on the outer side of the inner cylinder 4 and is in sealing connection with the inner cylinder 4, a sealing space is formed by enclosing the outer cylinder 1 and the inner cylinder 4 after the outer cylinder 1 and the inner cylinder are in sealing connection, the sealing space comprises two chambers, one chamber is an annular chamber 14 between the inner cylinder 4 and the outer cylinder 1, the other chamber is an inner cavity of the inner cylinder 4, the two chambers are filled with liquid, the side walls of the inner cylinder 4, corresponding to the upper end and the lower end of the annular chamber 14, are respectively provided with a hole for communicating the two chambers, and the liquid in the two chambers can enter each other through the holes.

The inner cavity of the inner cylinder 4 comprises an expanding cavity 15 positioned at the upper part and a reducing cavity 12 positioned at the lower part, the sectional area of the expanding cavity 15 is larger than that of the reducing cavity 12, an upper piston 3 is arranged in the expanding cavity 15 in a sliding sealing manner, the upper end of the upper piston 3 is connected with an upper rod 2, the upper end of the upper rod 2 extends out of the piston cylinder shell and is matched with the piston cylinder shell in a sliding sealing manner, and torque can be transmitted between the upper rod 2 and the piston cylinder shell, namely, axial sliding can occur between the upper rod 2 and the piston cylinder shell, but relative rotary motion cannot occur, for example, the upper rod 2 has an elliptical hole on the upper end face of the piston cylinder shell corresponding to the elliptical cross section, so that torque can be transmitted between the upper rod 2 and the piston cylinder shell, and as long as the cross section of the upper rod 2 is non-circular, the torque can be transmitted between the upper rod 2 and the piston cylinder shell.

A lower piston 5 is arranged in the reducing cavity 12 in a sliding sealing manner, the lower end of the lower piston 5 is connected with a lower rod 6, and the lower end of the lower rod 6 extends out of the piston cylinder shell and is in sliding sealing fit with the piston cylinder shell; for convenience of distinction, the cross-sectional area of the upper piston 3 is referred to as S1, the cross-sectional area of the lower piston 5 is referred to as S2, the difference between the cross-sectional areas of the upper piston 3 and the upper rod 2 is referred to as S3, and the difference between the cross-sectional areas of the lower piston 5 and the lower rod 6 is referred to as S4, so that S1/S2 is referred to as S3/S4.

From the above, the principle of increasing the plunger stroke of the oil well pump is as follows: the upper rod 2 of the invention is connected with the sucker rod, and the lower rod 6 is connected with the plunger rod of the oil well pump; when the sucker rod downstroke, the upper rod 2 and the upper piston 3 move downwards at the same speed as the sucker rod, the volume of the diameter expansion cavity 15 is reduced by the downward movement of the upper piston 3, the volume of the diameter reduction cavity 12 is inevitably increased due to the incompressibility of liquid, however, the cross-sectional area of the diameter expansion cavity 15 is larger than that of the diameter reduction cavity 12, the downward speed of the lower piston 5 is inevitably larger than that of the upper piston 3, and the strokes of the lower piston 5 and the lower rod 6 are larger than the downstroke distance of the sucker rod. When the sucker rod is stroked upwards, the upper rod 2 and the upper piston 3 move upwards at the same speed as the sucker rod, the upper piston 3 moves upwards to compress the volume of the upper chamber 16, liquid enters the lower chamber 11 from top to bottom through the annular cavity 14 due to incompressibility of the liquid, hydraulic pressure acts on the lower end face of the lower piston 5, and the upward speed of the lower piston 5 is inevitably greater than the upward speed of the upper piston 3 due to S1/S2 which is S3/S4, so that the strokes of the lower piston 5 and the lower rod 6 are also greater than the upward stroke distance of the sucker rod.

Compared with the structure principle of the existing pumping aid, after the displacement is transmitted, the moving displacement of the plunger is larger than that of the sucker rod, so that the oil increasing and yield increasing functions of the oil well pump are realized.

According to the figures 2-3, the connecting part comprises an oil pipe short circuit 13 and elastic blocks 9, the oil pipe short circuit 13 is connected in series in an oil pipe column, the outer wall of the piston cylinder shell is provided with mounting grooves used for containing the elastic blocks 9, the mounting grooves are uniformly arranged on the outer wall of the piston cylinder shell in a circumferential direction at intervals, in the embodiment, the number of the mounting grooves is two, the number of the elastic blocks 9 is also two, a spring is arranged between the elastic blocks 9 and the piston cylinder shell, the elastic blocks 9 have a tendency of being far away from the piston cylinder shell under the elastic action of the spring, and elastic block pressing caps 10 used for limiting the elastic blocks are arranged on the piston cylinder shells at the upper end and the lower end of the elastic blocks 9.

The upper and lower end faces of the elastic block 9 are inclined planes, so that the elastic block is prevented from being blocked when the sucker rod string is lifted up or lowered down.

A connecting groove 8 is formed in one side, far away from the piston cylinder shell, of the elastic block 9, an axial guide slideway is formed in the upper portion of the inner wall of the oil pipe short joint 13, a circumferential guide slideway is formed in the lower portion of the inner wall of the oil pipe short joint 13, and the axial guide slideway is communicated with the circumferential guide slideway, as shown in fig. 3, a flaring is formed above the axial guide slideway, so that the elastic block 9 can conveniently enter the axial guide slideway; one end of the circumferential guide slideway is provided with a flaring, so that the elastic block 9 can conveniently enter the circumferential guide slideway. The circumferential guide slide way is internally provided with a connecting bulge 7, the shape of the connecting bulge 7 is matched with that of the connecting groove 8, and the connecting bulge 7 enters the connecting groove 8 through rotation so as to limit the elastic block 9 to generate radial displacement of an oil pipe.

From the above, the working principle of the connecting part of the present embodiment is as follows: 1. and (3) connecting: the sucker rod string is placed downwards, after the elastic block 9 enters the oil pipe short circuit 13 section, under the guide of the axial guide slide way and the circumferential guide slide way of the inner wall of the oil pipe short circuit 13, the piston cylinder shell rotates along with the rotation, the connecting bulge 7 and the connecting groove 8 are connected in a matched mode, so that the elastic block 9 is limited to generate radial displacement of the oil pipe, axial fixing of the piston cylinder shell is achieved, only the upper piston and the lower piston move in the oil pumping process, and the piston cylinder shell does not move axially. 2. And (3) disconnecting the connection process: and continuing to rotate the pipe column to separate the connecting protrusion 7 from the connecting groove 8, namely realizing connection release.

Example two:

according to fig. 4-5, as an alternative of the connection component in the first embodiment, the connection component in this embodiment includes an oil pipe short circuit 13 and a friction block 20, the oil pipe short circuit 13 is connected in series in an oil pipe string, the outer wall of the piston cylinder housing is fixedly sleeved with two short circuits 17 arranged up and down, the two short circuits 17 are fixedly connected to the piston cylinder housing, and the two short circuits 17 are respectively in interference fit with the piston cylinder housing and connected by anti-rotation nails.

The outer sides of the two short joints 17 are both provided with threads, and the thread directions of the outer sides of the two short joints 17 are opposite.

The friction block 20 is arranged on the piston cylinder shell between the two short circuits 17, a spring is arranged between the friction block 20 and the piston cylinder shell, the friction block 20 has a tendency of being far away from the piston cylinder shell under the elastic force action of the spring, and the upper end face and the lower end face of the friction block 20 are inclined planes, so that the friction block 20 is prevented from being blocked when a sucker rod string is lifted or lowered.

The outer sides of the two short circuits 17 are respectively screwed with friction block pressing caps 18, as shown in fig. 5, the friction block pressing caps 18 extend between two adjacent friction blocks 20, and therefore, the two friction block pressing caps 18 and the friction blocks 20 rotate synchronously. A limiting sleeve 19 is sleeved on the outer side of the friction block pressing cap 18, an ejection spring 22 with an oil pipe axially stretching and retracting is arranged between the limiting sleeve 19 and the friction block pressing cap 18, the limiting sleeve 19 has a tendency of being close to the friction block 20 under the elastic force action of the ejection spring 22, limiting grooves 21 matched with the limiting sleeve 19 are respectively arranged at the upper end and the lower end of the friction block 20, a limiting concave ring 23 used for limiting the friction block 20 in an up-and-down direction is arranged on the inner wall of the oil pipe short circuit 13, the friction block 20 generates displacement far away from the piston cylinder shell after reaching the inside of the limiting concave ring 23 in the down-moving process, and the limiting sleeve 19 enters the limiting groove 21 so as to limit the friction block 20 to generate radial displacement of the oil pipe; the outer side of one end of the friction block pressing cap 18 close to the friction block 20 is provided with a step 24 for limiting the limiting sleeve 19.

From the above, the working principle of the present embodiment is: 1. and (3) connecting: the sucker rod string is lowered, before the sucker rod string reaches the oil pipe short circuit 13, the friction block 20 is as shown in fig. 4, after the friction block reaches the limiting concave ring 23 of the oil pipe short circuit 13, the limiting concave ring 23 provides an outward expanding space for the friction block 20, the friction block 20 expands outward under the elastic force action of the spring, the limiting sleeve 19 can stretch into the limiting groove 21 after the friction block 20 expands outward, the friction block 20 is clamped in the limiting concave ring 23 and cannot be retracted, and therefore the piston cylinder shell is fixedly connected with the oil pipe string in the axial direction through the connecting part. 2. The process of disconnecting: the piston cylinder shell rotates along with the rotary pipe column, and friction force generated by the friction block 20 and the inner wall of the oil pipe is large, so that the friction block 20 and the piston cylinder shell rotate relatively, the friction block pressing cap 18 extends between two adjacent friction blocks 20 and rotates synchronously with the friction block 20, so that the friction block pressing cap 18 and the piston cylinder shell rotate relatively, and threads on two short circuits 17 are different in rotating direction, so that the two friction block pressing caps 18 are separated from each other in a back-to-back manner by rotating the pipe column, the step 24 on the friction block pressing cap 18 drives the two limit sleeves 19 to be separated from each other in a back-to-back manner, the limit sleeves 19 are pulled out of the limit grooves 21 of the friction blocks 20, the contraction limit of the friction block 20 is relieved, and the sucker rod column can be lifted up.

The connecting part of the invention is equivalent to the righting body arranged on the outer side of the piston cylinder shell, so that the invention has the functions of strengthening oil and increasing production.