CN2378530Y

CN2378530Y - Nylon centralising coupling for sucker rod

Info

Publication number: CN2378530Y
Application number: CN 99212691
Authority: CN
Inventors: 靳从起; 李传乐; 吕树章; 石卫华
Original assignee: 靳从起
Priority date: 1999-05-28
Filing date: 1999-05-28
Publication date: 2000-05-17
Anticipated expiration: 2009-05-28

Abstract

The utility model discloses a nylon centralizing coupling for a sucker rod, which is composed of a special-shaped coupling and a centralizing body. The both ends of the coupling are provided with inner threads, the upper part of the coupling is in a concave shape, and the lower part is in a bow shape. A centralizing body is arranged on the bow-shaped position of the coupling, and four spiral edges are uniformly distributed on the centralizing body. Because the spiral centralizing body adopts wear resistant nylon with high strength, on one hand, the wear of the coupling of the sucker rod to an inner wall of an oil pipe is relieved, the service life of the coupling of the sucker rod and the oil pipe is extended, and on the other hand, well lying operation which is caused because of eccentric wear is reduced.

Description

A kind of nylon sucker rod is set upright box cupling

The utility model relates to a kind of nylon sucker rod and sets upright box cupling.

Old filed has entered the high water-cut development stage at present, because a large amount of oil wells have certain gradient, and mainly exploit with oil pumper in the oil field, and the eccentric wear that sucker rod and box cupling thereof and tube inner wall produce is more and more serious, and shorten the application life of oil pipe and sucker rod greatly.Because the rod collar diameter is bigger, eccentric wear mainly shows on the box cupling, makes box cupling and oil pipe serious wear finally cause the disconnected operation of taking off.In order to prevent that sucker rod and box cupling thereof and tube inner wall from producing eccentric wear, usually adopt centralizer to set upright, wherein the patent No. is: 85203887 roller type centralizer is owing to easily block wheel and reason for corrosion, seldom use at present, KVB30H nylon centralizer commonly used now, there is following shortcoming in this centralizer: 1, centralizer slides on sucker rod, sets upright weak effect; 2, wear surface is less, and bigger to the oil pipe wearing and tearing, application life is short; 3, after the inefficacy, the easy holddown of the fragment that comes off.

The purpose of this utility model is to overcome the shortcoming of prior art, provides a kind of nylon sucker rod to set upright box cupling.

The purpose of this utility model is achieved in that nylon sucker rod sets upright box cupling and be made up of special-shaped box cupling and centralizer body, the two ends of box cupling are provided with internal thread, the top of box cupling is " recessed " shape, the bottom is " bow " shape, on " bow " shaped position of box cupling, be injected with centralizer body, centralizer body adopts high-strength abrasion-proof nylon to make, and centralizer body is evenly distributed with 4 scrolls, and the external diameter of centralizer body is slightly less than pipe aperture.

The utility model is slightly less than the nylon spiral centralizer body of pipe aperture by injection moulding diameter on special-shaped box cupling, thereby play the effect of setting upright with paraffin cutting, and centralizer body adopts high-intensity wear resistant nylon, the wearing and tearing of rod collar have been alleviated on the one hand to tube inner wall, prolong the application life of rod collar and oil pipe, reduced the well operations of lying that causes because of eccentric wear on the other hand.

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1: sucker rod is set upright the box cupling structural representation;

Among the figure: 1-box cupling, 2-centralizer body, 3-scroll;

Nylon sucker rod is set upright box cupling and is made up of special-shaped box cupling 1 and centralizer body 2, the two ends of box cupling 1 are provided with internal thread, the top of box cupling 1 is " recessed " shape, the bottom is " bow " shape, on " bow " shaped position of box cupling 1, be injected with centralizer body 2, centralizer body 2 adopts high-strength abrasion-proof nylon to make, and centralizer body 2 is evenly distributed with 4 scrolls 3, and the external diameter of centralizer body 2 is slightly less than pipe aperture.During use box cupling is installed between two sucker rods, the matrix on box cupling top is used for detaining on the pipe wrench, sucker rod in the course of the work, nylon spiral centralizer body plays centralizing function on the one hand, play the paraffin cutting effect on the other hand, the wearing and tearing of nylon centralizer body have prolonged application life of oil pipe and rod collar, pass through and the helical flow path on the centralizer body is beneficial to medium, can not cause the obstruction of box cupling.

Claims

1, a kind of nylon sucker rod is set upright box cupling, it is characterized in that: the two ends of box cupling (1) are provided with internal thread, box cupling (1) top is " recessed " shape, the bottom is " bow " shape, be injected with nylon spiral centralizer body (2) on " bow " shaped position of box cupling (1), the external diameter of centralizer body (2) is slightly less than pipe aperture.

2, nylon sucker rod according to claim 1 is set upright box cupling, it is characterized in that described spiral centralizer body (2) has 4 even distribution scrolls (3).