CN215949392U

CN215949392U - Screw pump eccentric wear prevention centralizer special for coal bed gas horizontal well

Info

Publication number: CN215949392U
Application number: CN202122572213.XU
Authority: CN
Inventors: 张小三; 李荣业; 张奔
Original assignee: Shanxi Yunsheng Zhilian Energy Technology Co ltd
Current assignee: Shanxi Yunsheng Zhilian Energy Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-03-04
Anticipated expiration: 2031-10-25

Abstract

The utility model discloses a special screw pump anti-eccentric centralizer for a coal bed gas horizontal well, which comprises a sucker rod, a positioning sleeve and a rotary sleeve, wherein the positioning sleeve is fixed on the sucker rod, and the periphery of the positioning sleeve is provided with a limiting groove; the rotating sleeve comprises a sleeve and a righting block arranged on the periphery of the sleeve, the sleeve is sleeved on the limiting groove and can rotate relative to the positioning sleeve, and the righting block outwards extends to the outside of the limiting groove. The screw pump eccentric wear prevention centralizer special for the coal bed gas horizontal well positions the rotating sleeve through the limiting groove on the positioning sleeve and is matched with a limiting structure in the well so as to keep the relative position of the rotating sleeve unchanged. When the sucker rod rotates in the well, the up-and-down movement of the positioning sleeve is limited by the righting block, so that the phenomenon of up-and-down movement of the sucker rod is avoided, the displacement of the sucker rod in the working process is reduced, and the production efficiency is improved.

Description

Screw pump eccentric wear prevention centralizer special for coal bed gas horizontal well

Technical Field

The utility model belongs to the technical field of centralizers, and particularly relates to an eccentric wear prevention centralizer for a screw pump special for a coal bed gas horizontal well.

Background

The coal bed gas is a gas resource associated and symbiotic with coal, refers to hydrocarbon gas stored in a coal bed, takes methane as a main component, belongs to unconventional natural gas, can be used as civil fuel, industrial fuel, power generation fuel, automobile fuel and important chemical raw materials, and has wide application.

In the process of drainage and production of the coal bed gas, the ground equipment uses rod oil production equipment, the ground power equipment drives the connected sucker rod, and then the sucker rod drives a screw pump in the coal bed well to rotate, so that the purpose of drainage and gas production is achieved. Aiming at the particularity of a coal bed gas horizontal well, a down-hole screw pump is inclined by about 85 degrees under the normal condition, the existing buckle type centralizer additionally arranged on the sucker rod is directly clamped on a sucker rod body, a limiting device is not arranged, the sucker rod is easy to shift particularly in the large-inclination production rotating process, the sucker rod is caused to move up and down, and the centralizing effect cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a screw pump eccentric wear prevention centralizer special for a coal bed gas horizontal well, and solves the problem that an existing buckle type centralizer is poor in limiting performance.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a special screw pump eccentric wear prevention centralizer for a coal bed gas horizontal well comprises a sucker rod, a positioning sleeve and a rotary sleeve, wherein the positioning sleeve is fixed on the sucker rod, and the periphery of the positioning sleeve is provided with a limiting groove; the rotating sleeve comprises a sleeve and a righting block arranged on the periphery of the sleeve, the sleeve is sleeved on the limiting groove and can rotate relative to the positioning sleeve, and the righting block outwards extends to the outside of the limiting groove.

In one possible design, a set of centralizing blocks is respectively arranged at two ends of the sleeve, and each set of centralizing block comprises at least two centralizing blocks uniformly distributed along the periphery of the sleeve.

In one possible design, the rotating sleeve is divided into two half structures, each half structure comprises a sub-pipe body and a centering block arranged on the sub-pipe body, and the two sub-pipe bodies are aligned and fastened to form the sleeve.

In one possible design, a reinforcing rib is provided between the casing and the centralizing block.

In one possible design, the rotating sleeve further comprises a rolling structure, the rolling structure comprises a ball hole and a plurality of balls which are rotatably arranged in the ball hole, the ball hole is provided with a plurality of balls which are respectively arranged on the inner circumferential surface of the righting block and the outer circumferential surface of the righting block, part of the balls extend out of the ball hole, and the balls are provided with a plurality of balls and are arranged in one-to-one correspondence with the ball hole;

correspondingly, a first conical surface is arranged on the limiting groove, a second conical surface adaptive to the first conical surface is arranged on the sleeve, a ball hole is formed in the second conical surface, a ball is arranged in the ball hole, and clearance fit is formed between the sleeve and the positioning sleeve through the ball.

In one possible design, the ball hole is filled with a lubricating oil, grease or solid lubricant.

In one possible design, the positioning sleeve comprises a central pipe and a baffle ring, wherein the central pipe is fixedly sleeved on the sucker rod, and two ends of the central pipe are respectively connected with the baffle ring; the baffle ring protrudes outwards to form a limiting groove.

In one possible design, the first conical surface is a transition surface between the central tube and the baffle ring.

In one possible design, the locating sleeve, the sleeve and the centralizer block are all made of nylon material.

In one possible design, the outer peripheral surface of the sucker rod is knurled.

Has the advantages that:

the screw pump eccentric wear prevention centralizer special for the coal bed gas horizontal well positions the rotating sleeve through the limiting groove on the positioning sleeve and is matched with a limiting structure in the well so as to keep the relative position of the rotating sleeve unchanged. When the sucker rod rotates in the well, the up-and-down movement of the positioning sleeve is limited by the righting block, so that the phenomenon of up-and-down movement of the sucker rod is avoided, the displacement of the sucker rod in the working process is reduced, and the production efficiency is improved.

Through the setting of rolling structure, make between swivel sleeve and the position sleeve, right between piece and the oil pipe all through the rolling friction rotation of steel ball, reduced the frictional force between sucker rod and the oil pipe, improved life, reduced the resistance that receives in the sucker rod working process, reduced the wearing and tearing of oil pipe inner wall and the energy consumption of ground equipment.

The rotary sleeve is abutted against the conical surface of the positioning sleeve through the steel balls, and axial force and radial force are transmitted simultaneously, so that the raised centering blocks at two ends and the sleeve structure with the middle thin wall are arranged, the use of materials is reduced under the condition of not reducing functions, and the cost is reduced.

Drawings

FIG. 1 is a schematic structural view of a screw pump eccentric wear prevention centralizer special for a coal bed gas horizontal well.

Fig. 2 is a schematic sectional view of the section a-a in fig. 1.

Fig. 3 is a partially enlarged structural diagram of a portion B in fig. 1.

In the figure:

1. a sucker rod; 2. a positioning sleeve; 21. a central tube; 22. a baffle ring; 201. a first conical surface; 3. a rotating sleeve; 31. a sleeve; 32. a righting block; 33. a rolling structure; 331. a ball hole; 332. a ball bearing; 333. a ball sleeve; 301. and (5) reinforcing ribs.

Detailed Description

Example (b):

aiming at the problem that the existing buckle type centralizer is poor in centralizing effect, namely the existing buckle type centralizer is not provided with a limiting device and is easy to shift when working obliquely, the special screw pump anti-eccentric centralizer for the coal bed gas horizontal well is provided, and concretely, as shown in figures 1-3, the special screw pump anti-eccentric centralizer for the coal bed gas horizontal well comprises a sucker rod 1, a positioning sleeve 2 and a rotary sleeve 3, wherein the positioning sleeve 2 is fixed on the sucker rod 1, and the periphery of the positioning sleeve 2 is provided with a limiting groove; the rotating sleeve 3 comprises a sleeve 31 and a righting block 32 arranged on the periphery of the sleeve 31, the sleeve 31 is sleeved on the limiting groove and can rotate relative to the positioning sleeve 2, and the righting block 32 extends out of the limiting groove.

Specifically, the limit effect is achieved by the rotary sleeve 3, that is, the inner peripheral portion of the rotary sleeve 3, that is, the inner periphery of the sleeve 31 and the inner periphery of the centering block 32, are connected to the positioning sleeve 2, and the up-and-down movement of the rotary sleeve 3 is limited by the limit groove, in other words, the up-and-down movement of the positioning sleeve 2 and the sucker rod 1 is also limited when the relative position of the rotary sleeve 3 is kept unchanged.

The peripheral part of rotatory cover 3, extend to the piece 32 of rightting outside the spacing groove promptly, but plug-in connects to outside cell body structure in, and then restriction rotatory cover 3 reciprocate, at this moment, when the drunkenness about the sucker rod 1 appears, the spacing groove with the butt to the tip of rotatory cover 3 on, and then reduce the range of sucker rod 1 drunkenness, play and right the effect.

When the sucker rod fixing device works, the sucker rod 1 rotates under the driving of ground equipment, and the positioning sleeve 2 is fixedly connected with the sucker rod 1, so that the positioning sleeve 2 rotates along with the sucker rod 1. The sleeve 31 is rotatable relative to the positioning sleeve 2, and the positioning sleeve 2 does not drive the rotary sleeve 3 to rotate, so that the rotary sleeve 3 is kept relatively still.

The screw pump eccentric wear prevention centralizer special for the coal bed gas horizontal well is used for positioning the rotary sleeve 3 through the limiting groove on the positioning sleeve 2 and matching with a limiting structure in the well so as to keep the relative position of the rotary sleeve 3 unchanged. When the sucker rod 1 rotates in the well, the up-and-down movement of the positioning sleeve 2 is limited by the righting block 32, so that the up-and-down movement of the sucker rod 1 is avoided, the displacement of the sucker rod 1 in the working process is reduced, and the production efficiency is improved.

In an achievable scheme, a group of centering blocks 32 are respectively arranged at two ends of the casing 31, and only one group of centering blocks 32 is theoretically feasible, but in the actual use process, especially after long-term use, under the influence of installation errors, abrasion, impurities and the like, deflection phenomena easily occur, so at least two groups of centering blocks 32 are required to be arranged to avoid deflection of the sucker rod 1 after long-term use, and prevent eccentric wear of the sucker rod 1 and the inner wall of an oil pipe.

It is easily understood that the number of the sets of the centering blocks 32 may be increased or decreased as appropriate according to the actual use condition. Alternatively, when two sets of centralizing blocks 32 are provided on the casing 31, it is preferable to provide one set of centralizing blocks 32 at each end of the casing 31.

In one implementation, each set of centralizing blocks 32 includes at least two centralizing blocks 32 spaced evenly around the circumference of casing 31. Therefore, the axial line of the sucker rod 1 is always parallel to the axial line of the inclined shaft, and eccentric wear of the sucker rod 1 and the inner wall of an oil pipe is prevented.

Specifically, the number of the centering blocks 32 in each group may be selected according to actual use conditions, and optionally, four centering blocks 32 in each group may be provided, and the four centering blocks 32 are uniformly distributed along the outer periphery of the casing 31.

In this embodiment, the rotary sleeve 3 is divided into two half structures, each half structure comprises a sub-pipe body and a centering block 32 arranged on the sub-pipe body, and the two sub-pipe bodies are aligned and fastened to form the sleeve 31. Namely, the rotary sleeve 3 is convenient to disassemble and assemble by being of a half-body structure, and the use convenience is improved.

It will be readily appreciated that the two sub-bodies may be connected by any suitable releasable connection including, but not limited to, a bolted connection, a flanged connection and a snap-fit connection.

In an achievable solution, a reinforcement rib 301 is provided between the sleeve 31 and the centralizing block 32. Therefore, the strength of the joint surface between the sleeve 31 and the centering block 32 is improved through the reinforcing ribs 301, the strength and the rigidity of the rotary sleeve 3 are improved, the product distortion caused by uneven stress caused by differences after finishing the operation is overcome, and the service life is prolonged; meanwhile, the method has the advantages of saving material, reducing weight and reducing cost.

The current buckle formula centralizer not only shifts easily, does not play the righting effect, still has other shortcomings, specifically as follows:

the body card that the one of them is buckle formula centralizer is on sucker rod 1 body, and when sucker rod 1 rotated, buckle formula centralizer was also driven and rotated by sucker rod 1, so increased the friction between sucker rod 1 and the oil pipe, increased the resistance that sucker rod 1 during operation received, increased the wearing and tearing of oil pipe inner wall and the energy consumption of ground equipment, influenced stable, the continuous production operating mode of coal bed gas well.

And the other one is that the upper end and the lower end of the centering block play a role in centering in the inclined shaft, the middle part of the centering block can not touch the inner wall of the oil pipe, and the currently used buckling type centering device has too large centering part and wastes materials.

Therefore, the anti-eccentric wear centralizer for the screw pump special for the coalbed methane horizontal well is improved, and specifically, the rotary sleeve 3 further comprises a rolling structure 33, the rolling structure 33 comprises a ball hole 331 and balls 332 which are rotatably arranged in the ball hole 331, wherein the ball hole 331 is provided with a plurality of balls and is respectively arranged on the inner circumferential surface of the centralizing block 32 and the outer circumferential surface of the centralizing block 32, part of the balls 332 extends out of the ball hole 331, and the balls 332 are provided with a plurality of balls and are arranged in one-to-one correspondence with the ball holes 331; correspondingly, a first conical surface 201 is arranged on the limiting groove, a second conical surface adapted to the first conical surface 201 is arranged on the sleeve 31, a ball hole 331 is arranged on the second conical surface, a ball 332 is arranged in the ball hole 331, and clearance fit is formed between the sleeve 31 and the positioning sleeve 2 through the ball 332.

Therefore, through the arrangement of the rolling structure 33, the rotating sleeve 3 and the positioning sleeve 2 and the centering block 32 and the oil pipe are rotated through the rolling friction of the steel balls 332, so that the friction force between the sucker rod 1 and the oil pipe is reduced, the service life is prolonged, the resistance of the sucker rod 1 in the working process is reduced, and the abrasion of the inner wall of the oil pipe and the energy consumption of ground equipment are reduced.

The rotary sleeve 3 is abutted against the conical surface of the positioning sleeve 2 through the steel balls 332, and simultaneously axial force and radial force are transmitted, so that the structures of the raised centralizing blocks 32 at two ends and the sleeve 31 with a thin middle wall are arranged, the use of materials is reduced under the condition of not reducing functions, and the cost is reduced.

In addition, a ball sleeve 333 can be arranged in the ball hole 331, and the ball 332 is embedded in the ball sleeve 333, so that the ball 332 can be positioned in the ball hole 331.

In one implementation, ball hole 331 is filled with a lubricant, grease, or solid lubricant. The proper lubricant can be selected according to the actual use condition, and the use is flexible and convenient.

In this embodiment, the positioning sleeve 2 includes a central tube 21 and a baffle ring 22, wherein the central tube 21 is fixedly sleeved on the sucker rod 1, and two ends of the central tube 21 are respectively connected with a baffle ring 22; the retainer ring 22 is outwardly convex to form a retaining groove.

Wherein, the central tube 21 is fixedly arranged on the sucker rod 1 in a pouring mode so as to enable the positioning sleeve 2 and the sucker rod 1 to synchronously rotate. Two ends of the central tube 21 are respectively connected with a baffle ring 22, and the diameter of the baffle ring 22 is larger than that of the central tube 21, so that a limit groove is formed by the two baffle rings 22.

In an implementation, the first conical surface 201 is a transition surface between the center tube 21 and the baffle ring 22. In this way, when the balls 332 abut on the first conical surface 201, the axial force and the radial force are transmitted simultaneously, so as to reduce the use of material, i.e. reduce the wall thickness of the sleeve 31, without reducing the function.

Alternatively, the locating sleeve 2, the casing 31 and the righting block 32 are all made of nylon material. The nylon material is a good material for replacing metals such as steel, iron, copper and the like with plastics, is an important engineering plastic, has excellent comprehensive performance, large rigidity, small creep, high mechanical strength, good heat resistance and good electrical insulation, can be used in harsh chemical and physical environments for a long time, has good wear resistance and corrosion resistance, is slightly influenced by the environment, and has good durability.

In the present embodiment, the outer peripheral surface of the sucker rod 1 is knurled. As such, the knurls serve an anti-slip function, and in particular, the knurls include, but are not limited to, mesh knurls.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. 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. The screw pump eccentric wear prevention centralizer special for the coal bed gas horizontal well is characterized by comprising a sucker rod (1), a positioning sleeve (2) and a rotary sleeve (3), wherein the positioning sleeve (2) is fixed on the sucker rod (1), and a limiting groove is formed in the periphery of the positioning sleeve (2); the rotating sleeve (3) comprises a sleeve (31) and a righting block (32) arranged on the periphery of the sleeve (31), the sleeve (31) is sleeved on the limiting groove and can rotate relative to the positioning sleeve (2), and the righting block (32) extends outwards to the outside of the limiting groove.

2. The screw pump anti-eccentric centralizer for the coalbed methane horizontal well according to claim 1, wherein a set of centralizing blocks (32) is respectively arranged at two ends of the casing pipe (31), and each set of centralizing block (32) comprises at least two centralizing blocks (32) uniformly distributed along the periphery of the casing pipe (31).

3. The screw pump eccentric wear prevention centralizer for the coalbed methane horizontal well is characterized in that the rotary sleeve (3) is divided into two half structures, each half structure comprises a sub-pipe body and a centralizing block (32) arranged on the sub-pipe body, and the two sub-pipe bodies are aligned and buckled to form the sleeve (31).

4. The screw pump eccentric wear prevention centralizer for the coal bed gas horizontal well is characterized in that a reinforcing rib (301) is arranged between the sleeve (31) and the centralizing block (32).

5. A screw pump anti-eccentric centralizer for a coalbed methane horizontal well according to any one of claims 1-4, wherein the rotary sleeve (3) further comprises a rolling structure (33), the rolling structure (33) comprises a ball hole (331) and balls (332) rotatably arranged in the ball hole (331), wherein the ball hole (331) is provided with a plurality of balls and respectively arranged on the inner circumferential surface of the casing (31) and the outer circumferential surface of the centralizing block (32), part of the balls (332) extend out of the ball hole (331), and the balls (332) are provided with a plurality of balls and are arranged corresponding to the ball hole (331) one by one;

correspondingly, a first conical surface (201) is arranged on the limiting groove, a second conical surface adaptive to the first conical surface (201) is arranged on the sleeve (31), a ball hole (331) is formed in the second conical surface, a ball (332) is arranged in the ball hole (331), and clearance fit is formed between the sleeve (31) and the positioning sleeve (2) through the ball (332).

6. The screw pump eccentric wear prevention centralizer for the coal bed gas horizontal well is characterized in that the ball hole (331) is filled with lubricating oil, lubricating grease or solid lubricant.

7. The screw pump eccentric wear prevention centralizer for the coalbed methane horizontal well is characterized in that the positioning sleeve (2) comprises a central pipe (21) and a baffle ring (22), wherein the central pipe (21) is fixedly sleeved on the sucker rod (1), and two ends of the central pipe (21) are respectively connected with the baffle ring (22); the stop ring (22) protrudes outwards to form a limiting groove.

8. The screw pump eccentric wear prevention centralizer for the coal bed gas horizontal well is characterized in that the first conical surface (201) is a transition surface of the central pipe (21) and the baffle ring (22).

9. The screw pump eccentric wear prevention centralizer for the coalbed methane horizontal well is characterized in that the locating sleeve (2), the casing pipe (31) and the centralizing block (32) are all made of nylon materials.

10. The screw pump eccentric wear prevention centralizer for the coal bed gas horizontal well is characterized in that knurling is processed on the outer circumferential surface of the sucker rod (1).