CN2809269Y

CN2809269Y - Junk prevention device for oil well pump

Info

Publication number: CN2809269Y
Application number: CN 200520031239
Authority: CN
Inventors: 苟天成; 郑文照; 岳为; 任淑萍
Original assignee: 郑文照
Priority date: 2005-07-14
Filing date: 2005-07-14
Publication date: 2006-08-23
Anticipated expiration: 2015-07-14

Abstract

The utility model discloses a junk prevention device for oil well pumps, which is composed of a pump barrel, an upper coupling, a lower coupling and a fixed valve assembly, wherein the fixed valve assembly is connected with a heterotype coupling. An outer layer pipe and an inner center pipe are connected between the heterotype coupling and the upper coupling by screws. The top of the inner center pipe is a sealed end, and the pipe wall of the inner center pipe below the sealed end is provided with oil through holes. Underground oil flows through a fixed master valve and enters the inner center pipe, and then the oil is lifted to the well mouth through the oil through holes, the annular space between the outer layer pipe and the inner center pipe, and the pump barrel. Oil well sand, well mouth junk, and foreign substances such as scale peeling, mill scales, etc. of a rod body or of the inner wall of an oil pipe are deposited in the annular space between the outer layer pipe and the inner center pipe, so foreign substances are prevented from falling into the fixed valve directly. Therefore, the utility model realizes the effect of prolonging the service life of the oil well pump in a well, raising the pumping efficiency, and decreasing the maintenance cost and the production cost.

Description

Oil well pump is prevented the junk device

Technical field:

The utility model relates to the anti-junk device of a kind of oil well pump, belongs to downhole tool technical field in the oil development production.

Technical background:

In the prior art, the oil well pump that oil field machinery oil is general, its structure has traveling valve, lower end directly to be connected and fixed valve for being provided with the plunger that connects together with sucker rod in the oil pumping pump barrel in the plunger.The major defect that exists is: when oil well pump with oil pipe under behind design attitude, standing valve cuts out, piston together is lowered in the oil well pump pump barrel together with sucker rod, in the process of going into the well, because odjective cause, well head, the body of rod or tube inner wall are unclean, cause the well head junk, the dirty skin of the body of rod or tube inner wall, some foreign matters such as scale directly fall into the standing valve place, when serious the fixed valve ball pad is risen, cause the poorly sealed and problem of leaking of standing valve, in addition, it also is ubiquitous problem in the present oil extraction process that the oil well shaft bottom shakes out, prior art can't overcome the infringement that sand production causes oil well pump, thereby influences pump efficiency.

Summary of the invention:

The purpose of this utility model is exactly to overcome in the prior art foreign matter in the well recovery sand control and well head and tubing string to fall to causing the poorly sealed and problem of leaking of standing valve, and a kind of oil well pump of design is prevented the junk special tool.

The utility model is by pump barrel, last box cupling, following box cupling, the standing valve assembly is formed, on the standing valve assembly, connect a special-shaped box cupling, between special-shaped box cupling and last box cupling by an external pipe and the innermost tube of being threaded, the innermost tube top is a sealed end, have oil through on the tube wall of the innermost tube under the sealed end, subterranean oil is flowed through after fixedly main valve enters innermost tube, annular space through oil through and external pipe and innermost tube, pump barrel is thus lifted to well head, sand production, the well head junk, the dirty skin of the body of rod or tube inner wall, some foreign matters such as scale then are deposited in the annular space of external pipe and innermost tube, avoid foreign matter directly to fall into the standing valve place, thereby realization prolongation oil well pump is in the working life of down-hole, improve pump efficiency, reduced maintenance expenses, the effect that reduces production costs.

Accompanying drawing and explanation:

Fig. 1 is the utility model structural representation

Among the figure: box cupling under 1-pump barrel, the last box cupling of 2-, 3-external pipe, 4-adapter coupling, 5-standing valve assembly, 6-oil through, 7-innermost tube, 8-annular space, 9-standing valve, 10-oil through, the 11-.

Embodiment:

As shown in Figure 1, the utility model is made up of pump barrel 1, last box cupling 2, following box cupling 11, standing valve assembly 5, on standing valve assembly 5 by the special-shaped box cupling 4 that is threaded, between special-shaped box cupling 4 and last box cupling 2 by an external pipe 3 and the innermost tube 7 of being threaded, the top of innermost tube 7 is a sealed end, has oil through 6 under the sealed end on the tube wall of innermost tube 7.During proper functioning, oil stream enters innermost tube 7 by standing valve 9 and oil through 10, and the drain tap 6 of flowing through enters outer tube 3, and then enters oil pumping pump barrel 1, is thus lifted to ground.When sand production or the foreign matter that has well head junk or oil pipe to come off fall in the well, last sealed end through innermost tube 7 stops, it is entered external pipe 3 deposits with annular space innermost tube 78 places, can not enter standing valve 9 places of standing valve assembly 5, reduce the probability that the down-hole foreign matter blocks traveling valve, reached and prolong oil well pump in the working life of down-hole, improved pump efficiency, reduce maintenance expenses, the purpose that reduces production costs.

Claims

1, the anti-junk device of a kind of oil well pump, form by pump barrel (1), last box cupling (2), following box cupling (11), standing valve assembly (5), it is characterized in that, go up by the special-shaped box cupling (4) that is threaded at standing valve assembly (5), between special-shaped box cupling (4) and last box cupling (2) by an external pipe (3) and the innermost tube (7) of being threaded, the top of innermost tube (7) is a sealed end, has oil through (6) on the top tube wall of pipe (7) at heart.