CN210509073U - Oil pipe thread protection device - Google Patents

Abstract

The utility model provides an oil pipe thread protection device, go up oil pipe, oil pipe coupling, oil pipe threaded connection in proper order down, be equipped with the boss between the upper and lower screw thread of oil pipe coupling, the internal diameter of boss is less than the internal diameter of last oil pipe, oil pipe down, thermal spraying wearing layer on the boss, the internal diameter of going up oil pipe, oil pipe down is the same, go up sucker rod, sucker rod coupling, sucker rod down and connect gradually, go up sucker rod, sucker rod coupling, down the sucker rod is in last oil pipe, oil pipe coupling, oil pipe down, the sucker rod coupling sets up guide section, righting section, last guide section from last to down, the structure and the size of going up guide section, righting section are the same and the symmetry sets up in the both ends of righting the section, the diameter of righting the section is greater than the diameter of upper guide section, righting section, the diameter difference of righting section with upper guide section, the diameter of righting section be less than boss, When the upper guide section is contacted with the inner wall of the boss, the righting section is not contacted with the inner walls of the upper oil pipe and the lower oil pipe.

Description

Oil pipe thread protection device

Technical Field

The utility model belongs to the downhole equipment that the oil field oil pumping well was used is an oil pipe screw thread protection device.

Background

As shown in fig. 1, the existing oil pumping string is composed of an upper oil pipe 01, a coupling 02, and a lower oil pipe 03 which are connected in sequence. After the oil pipes processed according to the national standard GB9252.3 are connected with the coupling, a gap of about 20mm is reserved between the two oil pipes, when oil is pumped, the coupling of the sucker rod passes through the gap in each stroke, the coupling of the sucker rod can be hung on the port of the oil pipe when passing through the gap, the damage of the oil pipe from the port is gradually aggravated, the oil pipe is leaked or tripped out and falls into the well, the production period of the oil well is shortened, the oil well needs frequent workover operation, the workover cost is increased, a large amount of oil pipes need to be replaced, and the economic loss is serious. According to the current state of the art, oil pipe thread protection devices are designed, such as Chinese patents: 2011205775380 protector for oil pipe thread. Although the inner diameter of the protective joint is smaller than the inner diameters of an upper oil pipe and a lower oil pipe, the sucker rod coupling can not touch and hang an oil pipe port during oil pumping, but because the sucker rod coupling does not have a reducer section, the upper end face of the sucker rod coupling is contacted with the inner wall of the oil pipe when reaching the boss, the sucker rod coupling still abrades the end part of the oil pipe, the end part of the oil pipe is provided with outer oil pipe threads, the wall thickness of the part is thinner than the pipe body, the threads are easily damaged due to abrasion, and the service life of the oil pipe is short (the oil pipe damage is the part with threads at both ends.

Disclosure of Invention

The utility model aims at designing an oil pipe screw thread protection device, the sucker rod coupling can not touch and hang oil pipe port and wearing and tearing oil pipe tip, makes the oil pipe at threaded position obtain the protection, extension oil pipe life.

The purpose of the utility model is realized like this: the sucker rod comprises an upper oil pipe, an oil pipe coupling, a lower oil pipe, an upper sucker rod, a sucker rod coupling and a lower sucker rod, wherein the lower part thread of the upper oil pipe is in threaded connection with the upper part of the oil pipe coupling, the lower part thread of the oil pipe coupling is in threaded connection with the upper part of the lower oil pipe, a boss is arranged between the upper thread and the lower thread of the oil pipe coupling, the inner diameter of the boss is smaller than the inner diameters of the upper oil pipe and the lower oil pipe, a wear-resistant layer is thermally sprayed on the boss, the inner diameters of the upper oil pipe and the lower oil pipe are the same, the upper sucker rod, the sucker rod coupling and the lower sucker rod are sequentially connected, the upper sucker rod, the sucker rod coupling and the lower oil pipe are arranged in the upper oil pipe, the sucker rod coupling is provided with an upper guide section, a centering section and a lower guide section from top to bottom, the upper guide section and the lower guide section, The diameter difference of the lower guide section is smaller than the diameter difference of the upper oil pipe, the lower oil pipe and the boss, so that when the upper guide section and the lower guide section are in contact with the inner wall of the boss, the righting section is not in contact with the inner walls of the upper oil pipe and the lower oil pipe.

The utility model has the advantages that: go up sucker rod, sucker rod coupling, when lower sucker rod oil pumping does up-and-down motion last guide section, lower guide section arrive when boss port department, by boss right the pole post, under the poor effect of diameter, right the section not with the oil pipe inner wall contact that has the external screw thread position, can not wear this section oil pipe inner wall, right the section effect down the oil pipe inner wall that has the external screw thread position of upper guide section, lower guide section also can not wear and tear, make the oil pipe screw thread obtain the protection, consequently, the utility model discloses can reach the invention purpose, can improve oil pipe's life, can prolong oil well production cycle, reduce the oil pipe quantity, have apparent economic benefits.

Drawings

FIG. 1 is a prior art tubing string configuration.

Fig. 2 is an assembly view of the present invention.

Detailed Description

An embodiment of the present invention will be described with reference to fig. 2.

As shown in the attached figure 2, the embodiment of the utility model comprises an oil feeding pipe 1, an oil pipe coupling 2, a lower oil pipe 5, an oil feeding rod 6, a sucker rod coupling 7 and a lower sucker rod 8, wherein the lower part thread of the oil feeding pipe 1 is connected with the upper part thread of the oil pipe coupling 2, the lower part thread of the oil pipe coupling 2 is connected with the upper part thread of the lower oil pipe 5, a boss 3 is arranged between the upper thread and the lower thread of the oil pipe coupling 2, the inner diameter of the boss 3 is smaller than that of the oil feeding pipe 1 and the lower oil pipe 5, a wear-resistant layer 4 is thermally sprayed on the boss 3, the inner diameters of the oil feeding pipe 1 and the lower oil pipe 5 are the same, the upper sucker rod 6, the sucker rod coupling 7 and the lower sucker rod 8 are sequentially connected, the upper sucker rod 6, the sucker rod coupling 7 and the lower sucker rod 8 are arranged in the upper oil pipe 1, the, the structure and the size of the upper guide section 7-1 and the lower guide section 7-3 are the same and are symmetrically arranged at two ends of the righting section 7-2, the diameter of the righting section 7-2 is larger than that of the upper guide section 7-1 and the lower guide section 7-3, the diameter difference between the righting section 7-2 and the upper guide section 7-1 and the diameter difference between the righting section 7-3 and the lower guide section 7-1 are smaller than that between the upper oil pipe 1 and the lower oil pipe 5 and the boss 3, so that when the upper guide section 7-1 and the lower guide section 7-3 are in contact with the inner wall of the boss 3, the righting section 7-2 is not in contact with the inner walls of the upper oil pipe 1 and the lower oil pipe 5.

Go up oil pipe 1, tubing coupling 2, oil pipe 5 down has many, and the radical is decided by the well-descending degree of depth, goes up oil pipe 1, tubing coupling 2, oil pipe 5 links together and is called the tubular column down, goes up sucker rod 6, sucker rod coupling 7, sucker rod 8 down and has many, and the radical is decided by the pump depth, goes up sucker rod 6, sucker rod coupling 7, sucker rod 8 down and links together and is called the pole post.

In order to realize that the upper guide section 7-1 and the lower guide section 7-3 are contacted with the inner wall of the boss 3, the righting section 7-2 is not contacted with the inner walls of the upper oil pipe 1 and the lower oil pipe 5, and the lengths of the upper guide section 7-1 and the lower guide section 7-3 are larger than the distance from the end surface of the oil pipe external thread length oil filling pipe to the boss 3.

Claims (1)

1. The utility model provides an oil pipe screw thread protection device, including last oil pipe (1), tubing coupling (2), oil pipe (5) down, go up sucker rod (6), sucker rod coupling (7), sucker rod (8) down, go up oil pipe (1) lower part screw thread and tubing coupling (2) upper portion threaded connection, tubing coupling (2) lower part screw thread and oil pipe (5) upper portion threaded connection down, be equipped with boss (3) between the upper and lower screw thread of tubing coupling (2), the internal diameter of boss (3) is less than last oil pipe (1), the internal diameter of oil pipe (5) down, thermal spraying wearing layer (4) on boss (3), it is the same to go up oil pipe (1), the internal diameter of oil pipe (5) down, go up sucker rod (6), sucker rod coupling (7), sucker rod (8) connect gradually down, go up sucker rod (6), sucker rod coupling (7), sucker rod (8) are last oil pipe (, In tubing coupling (2), oil pipe (5) down, characterized by: an upper guide section (7-1), a righting section (7-2) and a lower guide section (7-3) are arranged on a sucker rod coupling (7) from top to bottom, the upper guide section (7-1) and the lower guide section (7-3) have the same structure and size and are symmetrically arranged at two ends of the righting section (7-2), the diameter of the righting section (7-2) is larger than that of the upper guide section (7-1) and the lower guide section (7-3), the diameter difference between the righting section (7-2) and the upper guide section (7-1) and between the lower guide section (7-3) is smaller than that between the upper oil pipe (1) and between the lower oil pipe (5) and the boss (3), so that when the upper guide section (7-1) and the lower guide section (7-3) are in contact with the inner wall of the boss (3), the centralizing section (7-2) is not contacted with the inner walls of the upper oil pipe (1) and the lower oil pipe (5).

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