CN209875078U

CN209875078U - Eccentric wear prevention device for sucker rod

Info

Publication number: CN209875078U
Application number: CN201920233188.2U
Authority: CN
Inventors: 赵海洋; 任向海; 任波; 刘磊; 许强; 彭振华; 张园; 丁雯; 李亮; 焦保雷; 杨祖国; 王建海; 冯一波; 张中宝; 夏新跃; 钟敏
Original assignee: China Petrochemical Corp; Sinopec Northwest Oil Field Co
Current assignee: China Petroleum and Chemical Corp; China Petrochemical Corp; Sinopec Northwest Oil Field Co
Priority date: 2019-02-22
Filing date: 2019-02-22
Publication date: 2019-12-31
Anticipated expiration: 2029-02-22

Abstract

The utility model provides an anti-eccentric wear device for sucker rod, include: one end of the supporting cylinder is connected with the upper sucker rod; the connecting sleeve is connected to the other end of the supporting cylinder; the connecting rod is arranged in the connecting sleeve, a first end of the connecting rod is installed in the supporting cylinder, and a second end of the connecting rod axially extends outwards for a part; the coupling sleeve is used for connecting a lower sucker rod, is sleeved on the second end of the connecting rod and is connected with the connecting sleeve; wherein the connecting sleeve outside cover is equipped with fixed sleeve, fixed sleeve with support the section of thick bamboo with connect through positive and negative screw thread respectively between the connecting sleeve, the connecting rod is in under connecting sleeve's the restriction with support a section of thick bamboo can relative rotation and release the moment of torsion of sucker rod.

Description

Eccentric wear prevention device for sucker rod

Technical Field

The utility model belongs to the technical field of oil development equipment, specifically relate to an anti-eccentric wear device for sucker rod.

Background

The viscosity of the existing crude oil is greatly changed, and the viscosity of the existing crude oil is from dozens to hundreds of thousands of millipascal seconds (in an environment at 50 ℃). In the process of oil exploitation, under the condition of a high-temperature stratum, part of heavy oil reservoirs have certain fluidity, and the fluidity of crude oil reaching a shaft is poor, so that the downward resistance of a sucker rod is increased, and the torque is easy to generate. At present, a high-efficiency and feasible matched tool for preventing the underground sucker rod from falling off and eccentric wear is lacking on the market, and the eccentric wear tripping faults of the sucker rod are continuously increased along with the shortage of stratum energy and the rising of water content. In the prior art, most of sucker rod eccentric wear prevention adopts a mode of installing a centralizer on the sucker rod, so that although the abrasion of the sucker rod is reduced, the oil pipe is seriously abraded. In addition, the sucker rod anti-tripping device commonly used in the prior art is arranged at a wellhead and does not have the function of eccentric wear prevention.

SUMMERY OF THE UTILITY MODEL

To the technical problem as above, the utility model aims at providing an anti-eccentric device for sucker rod, this anti-eccentric device can realize autogiration under the condition that has the moment of torsion at the sucker rod to can effectively reduce sucker rod dropout and eccentric wear. Simultaneously, this prevent eccentric wear device can effectively reduce the wearing and tearing of sucker rod and oil pipe.

Therefore, according to the utility model discloses, a prevent eccentric wear device for sucker rod is proposed, include: one end of the supporting cylinder is connected with the upper sucker rod; the connecting sleeve is connected to the other end of the supporting cylinder; the connecting rod is arranged in the connecting sleeve, a first end of the connecting rod is installed in the supporting cylinder, and a second end of the connecting rod axially extends out of the supporting cylinder; the coupling sleeve is used for connecting a lower sucker rod, is sleeved on the second end of the connecting rod and is connected with the connecting sleeve; wherein, the cover is equipped with fixed sleeve outside the connecting sleeve, fixed sleeve with support a section of thick bamboo with connect through positive and negative screw thread respectively between the connecting sleeve, the connecting rod constructs to be able under connecting sleeve's restriction with support a section of thick bamboo can relative rotation and release the moment of torsion of sucker rod.

In a preferred embodiment, the inner part of the supporting cylinder is provided with a circular arc inner wall, and the first end of the connecting rod is configured to form a spherical crown surface which is rotatably matched with the circular arc inner wall.

In a preferred embodiment, a first shoulder is provided on the circular arc-shaped inner wall, the end of the connecting sleeve being in contact with the first shoulder.

In a preferred embodiment, an annular radial projection is provided on the outer wall of the connecting sleeve, one axial end of the radial projection being in contact with the end face of the support cylinder.

In a preferred embodiment, one end of the supporting cylinder is provided with a first female joint, and the supporting cylinder is fixedly connected with the upper sucker rod through the first female joint.

In a preferred embodiment, the fixing sleeve comprises a body portion and a cylindrical connecting portion provided at an end of the body portion, the cylindrical connecting portion having an inner diameter larger than an inner diameter of the body portion to form a second shoulder in the fixing sleeve.

In a preferred embodiment, the second shoulder is in contact with the other axial end of the radial projection.

In a preferred embodiment, a centralizer is sleeved on the outer side of the supporting cylinder, and the centralizer and the supporting cylinder can rotate relatively.

In a preferred embodiment, both ends of the centralizer are configured with circular arc shaped steps.

In a preferred embodiment, one end of the coupling sleeve is provided with a second female joint, and the coupling sleeve is fixedly connected with the lower sucker rod through the second female joint.

Compared with the prior art, the utility model has the advantages of:

according to the utility model discloses an anti-eccentric wear device for sucker rod makes it realize autogiration under the condition that has the moment of torsion at the sucker rod through rotatable connecting rod, fixed sleeve and a support section of thick bamboo combination. Meanwhile, the supporting cylinder, the connecting sleeve and the fixing sleeve are connected in a positive-negative buckling mode, and therefore the tripping probability of the connecting rod is effectively reduced. In addition, the eccentric wear prevention device adopts a centralizer which can rotate freely and is constructed with arc-shaped steps to centralize the sucker rod, and the anti-drop eccentric wear prevention of the sucker rod is completed together.

Drawings

The present invention will be described with reference to the accompanying drawings.

Figure 1 is a cross-sectional view of an anti-eccentric device for a sucker rod according to the present invention.

Fig. 2 shows a structure of a support cylinder in the eccentric wear prevention apparatus of fig. 1.

Fig. 3 shows the structure of the connecting rod in the eccentric wear prevention device of fig. 1.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

In this application, it should be noted that the one end of putting the eccentric wear prevention device for the sucker rod in the shaft far away from the well head according to the utility model is defined as "lower extreme" or similar terms, and the one end near the well head is defined as "upper end" or similar terms.

Fig. 1 is a cross-sectional view of an anti-eccentric device 100 for a sucker rod according to the present invention. As shown in fig. 1, the eccentric wear prevention device 100 includes a support cylinder 110. The support cylinder 110 is configured as a hollow cylinder, and an upper end (right end in fig. 1) of the support cylinder 110 is configured as a first female snap joint 111. The supporting cylinder 110 is fixedly connected with the upper sucker rod 101 through a first female snap joint 111. The lower end (left end in fig. 1) of the support cylinder 110 is configured as a cylindrical joint 112. In one embodiment, the outer surface of the cylindrical fitting 112 is provided with external threads. The support cylinder 110 is connected to other components by a cylindrical joint 112.

As shown in fig. 1 and 2, an inner wall surface of one end of the support cylinder 110 provided with the cylindrical joint 112 is configured as a circular arc-shaped inner wall. Meanwhile, a first shoulder 113 is provided on the inner wall of the end. The first shoulder 113 is adapted to receive other components.

In one embodiment, a groove 114 is provided on an outer wall of the support cylinder 110, and the groove 114 is provided near one end of the first female snap 111 and partially extends in a circumferential direction. The groove 114 facilitates the installation of the support cylinder 110, which is beneficial to improving the installation accuracy of the eccentric wear prevention device 100.

As shown in fig. 1, a coupling sleeve 120 is coupled to a lower end of the support cylinder 110. The outer diameter of the connection sleeve 120 is set to be equal to the inner diameter of the cylindrical joint 112 of the support cylinder 110. An annular radial projection 122 is provided on the outer wall surface of the connecting sleeve 120. The connect sleeve 120 is fitted into the cylindrical joint 112 of the support cylinder 110, the axial end of the connect sleeve 120 is in contact with the first shoulder 113 of the inner wall of the support cylinder 110, and the axial end of the radial projection 122 is in contact with the axial end of the cylindrical joint 112. In addition, an annular groove is formed in the outer wall of the connecting sleeve 120, and the annular groove facilitates installation of the connecting sleeve 120, so that the installation accuracy of the eccentric wear prevention device 100 can be further improved.

According to the utility model discloses, an anti eccentric wear device 100 for sucker rod still includes connecting rod 130, and connecting rod 130 can the free rotation. As shown in fig. 1, the connecting rod 130 is installed in the connecting sleeve 120, and a first end (right end in fig. 1) of the connecting rod 130 is seated on the circular arc-shaped inner wall of the support cylinder 110. A second end (left end in fig. 1) of the connecting rod 130 partially protrudes out of the connecting sleeve 120. The connecting rod 130 can rotate freely in the supporting cylinder 110 under the restriction of the connecting sleeve 120, so that relative rotation is generated between the cylinder 110 to release the torque generated by the sucker rod, and the abrasion of the sucker rod is reduced.

As shown in fig. 3, the first end of the connecting rod 130 is configured as a spherical crown surface 132 capable of forming a rotating fit with the circular arc-shaped inner wall of the support cylinder 110. The connecting sleeve 120 is sleeved on the connecting rod 130, the connecting rod 130 is connected with the connecting sleeve 120 without threads, and the first end of the connecting rod 130 is matched with the arc-shaped inner wall of the supporting cylinder 110 by the spherical crown surface 132 to form axial limiting.

According to the present invention, a fixing sleeve 140 is sleeved on the connecting sleeve 120. As shown in fig. 1, the fixing sleeve 140 includes a body portion 141, and an inner diameter of the body portion 141 is set to be equal to an outer diameter of the connection sleeve 120. An internal thread is provided on the inner wall surface of the body portion 141, and an external thread is provided on the outer wall of the connecting sleeve 120 at a region corresponding to the fixing sleeve. The fixing sleeve 140 is thereby screwed to the connecting sleeve 120 by means of corresponding internal and external threads. At one end of the body portion 141 of the fixing sleeve 140, a cylindrical connecting portion 142 is provided extending axially outwardly, the inner diameter of the cylindrical connecting portion 142 being set larger than the inner diameter of the body portion 141, so that the end of the body portion 141 forms a second shoulder 143 in the cylindrical joint 112. When installed, the second shoulder 143 contacts the axial end of the radial projection 122 on the outer wall surface of the adapter sleeve 120. Meanwhile, the inner diameter of the cylindrical connection part 142 is set to be equal to the outer diameter of the cylindrical joint 112 of the support cylinder 110, and an internal thread is provided on the inner wall surface of the cylindrical connection part 142, so that the fixing sleeve 140 and the support cylinder 110 are screw-connected by the corresponding internal thread and external thread. In this embodiment, the threaded connection between the support cylinder 110 and the fixing sleeve 140 and the connecting sleeve 120 is configured as a positive and negative threaded connection. The fastening connection between the supporting cylinder 110 and the connecting sleeve 120 is effectively ensured through the positive and negative screw thread connection, so that the connecting rod 130 is effectively prevented from being released in the self-rotating process, and the stability of the eccentric wear prevention device 100 is ensured.

According to the present invention, the eccentric wear prevention device 100 further includes a centralizer 150 disposed outside the support cylinder 110. Both ends of the centralizer 150 are constructed with circular arc steps. In one embodiment, the circular arc shaped step is provided to extend 60 ° in the circumferential direction. The structure of the centralizer 150 can effectively centralize the sucker rod in the working process, and can obviously reduce the eccentric wear between the sucker rod and the oil pipe, thereby effectively ensuring the working performance of the sucker rod and the oil pipe and simultaneously prolonging the service life of the sucker rod.

According to the present invention, the eccentric wear prevention device 100 for the sucker rod further includes a coupling sleeve 160. As shown in fig. 1, the collar 160 is disposed at the lower end (left end in fig. 1) of the coupling sleeve 120, and the collar 160 is fitted over the second end of the connecting rod 130 protruding out of the coupling sleeve 120. The collar sleeve 160 is used to prevent large particles in the well fluid from being stuck, and the collar sleeve 160 can separate large particles from the well fluid by using a centrifugal force, thereby effectively preventing the eccentric wear prevention apparatus 100 from generating sand sticking.

In this embodiment, the lower end (left end in fig. 1) of collar 160 is configured as a second box connector 161, and collar 160 is fixedly connected to lower sucker rod 102 through second box connector 161. The upper end (right end in fig. 1) of the collar 160 is provided with an annular, axially outwardly extending axial projection 162. The annular axial projection 162 has an outer diameter equal to the outer diameter of the collar 160 and an inner diameter equal to the outer diameter of the coupling sleeve 120. The lower end (left end in fig. 1) of the connecting sleeve 120 is connected with the axial projection 162. The connecting sleeve 120 and the axial protrusion 162 are in clearance fit and can rotate relatively. Thereby, foreign substances can be effectively prevented from entering the connection rod 130 and the connection sleeve 120.

The operation of the eccentric wear prevention device 100 for the sucker rod according to the present invention will be briefly described. According to the utility model discloses, eccentric wear prevention device 100 installs below the neutral point of sucker rod. When the eccentric wear prevention device 100 is lowered into the well bore, the coupling sleeve 160 is connected with the lower sucker rod 102, and the support cylinder 110 is connected with the upper sucker rod 101. When the eccentric wear prevention device 100 is in the up stroke, the sucker rod drives the eccentric wear prevention device 100 to move upwards, and when the eccentric wear prevention device 100 is in the down stroke, the connecting rod 130 and the supporting cylinder 110 rotate relatively, so that the torque of the sucker rod is released. Meanwhile, the centralizer 150 centralizes the sucker rod to jointly complete the anti-drop and anti-eccentric wear of the sucker rod. In operation, the fixing sleeve 140 is screwed forward and backward to prevent the connecting sleeve 120 from being disengaged, thereby ensuring the firmness.

According to the utility model discloses an anti-eccentric device 100 for sucker rod makes it realize autogiration under the condition that has the moment of torsion through rotatable connecting rod 130, fixed sleeve 140 and a support section of thick bamboo 110 combination. Meanwhile, the support cylinder 110, the connecting sleeve 120 and the fixing sleeve 140 are connected in a positive and negative buckling manner, so that the probability of tripping of the connecting rod 130 is effectively reduced. In addition, the eccentric wear prevention device 100 adopts the centralizer 150 which can rotate freely and is constructed with circular arc steps to centralize the sucker rod, and the anti-drop and eccentric wear prevention of the sucker rod are completed together.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-eccentric device for a sucker rod, comprising:

the supporting cylinder (110) is connected with the upper sucker rod (101) at one end;

a connection sleeve (120) connected to the other end of the support cylinder;

a connecting rod (130) disposed within the connecting sleeve, a first end of the connecting rod being mounted within the support cylinder and a second end of the connecting rod extending axially outwardly of the support cylinder;

a coupling sleeve (160) for connecting a lower sucker rod (102), the coupling sleeve being disposed on the second end of the connecting rod and connected to the connecting sleeve;

wherein, the connecting sleeve outside cover is equipped with fixed sleeve (140), fixed sleeve with support a section of thick bamboo and with connect the sleeve between respectively through positive and negative screw thread connection, the connecting rod construct can be under connecting sleeve's restriction with support a section of thick bamboo can relative rotation and release the moment of torsion of sucker rod.

2. The device of claim 1, wherein the support cylinder is provided with an inner circular-arc-shaped wall inside, and the first end of the connecting rod is configured as a spherical crown surface (132) capable of forming a rotating fit with the inner circular-arc-shaped wall.

3. An anti-eccentric device according to claim 2, characterized in that a first shoulder (113) is provided on the circular arc-shaped inner wall, with which first shoulder the end of the connecting sleeve is in contact.

4. An anti-eccentric device according to any of claims 1 to 3, characterized in that an annular radial projection (122) is provided on the outer wall of the connecting sleeve, one axial end of which is in contact with the end face of the support cylinder.

5. The device of any one of claims 1 to 3, wherein one end of the support cylinder is provided as a first female connector (111), and the support cylinder is fixedly connected with the upper sucker rod through the first female connector.

6. An anti-eccentric device according to claim 4, characterized in that the fixing sleeve comprises a body part (141) and a cylindrical connection part (142) arranged at the end of the body part, the inner diameter of the cylindrical connection part being arranged larger than the inner diameter of the body part to form a second shoulder (143) in the fixing sleeve.

7. The anti-eccentric device according to claim 6, characterized in that the second shoulder is in contact with the other axial end of the radial projection.

8. An anti-eccentric device according to any of claims 1 to 3, characterized in that a centralizer (150) is sleeved on the outside of the supporting cylinder, the centralizer and the supporting cylinder being capable of rotating relatively.

9. The device of claim 8, wherein both ends of the centralizer are configured with circular arc shaped steps.

10. The device of claim 1, wherein one end of the coupling sleeve is provided as a second box joint (161), and the coupling sleeve is fixedly connected with the lower sucker rod through the second box joint.