CN2270829Y

CN2270829Y - Oil pipe ancher for screw pump

Info

Publication number: CN2270829Y
Application number: CN 96238342
Authority: CN
Inventors: 纪绍智
Original assignee: FUTAI PETROLEUM MACHINERY MANUFACTURE Co Ltd LIAONING
Current assignee: FUTAI PETROLEUM MACHINERY MANUFACTURE Co Ltd LIAONING
Priority date: 1996-09-05
Filing date: 1996-09-05
Publication date: 1997-12-17
Anticipated expiration: 2006-09-05

Abstract

The utility model relates to an oil pipe anchoring device for a screw pump. The oil pipe anchoring device for a screw pump is adopted by an oil industry to be matched with a screw pump. The structure of the oil pipe anchoring device for a screw pump is improved on the basis of the prior art. Left or right spiral sawtooth-shaped threads are additionally arranged on the outer circular arc surfaces of three clamping tiles (2) which are uniformly arranged on a clamping tile seat (4). When the oil pipe anchoring device for a screw pump is not needed to anchor, a pin (8) only can run to an upper dead point of a short track. When the oil pipe anchoring device for a screw pump is needed to anchor, the pin (8) upwards walks along a long track. The clamping tiles (2) with the left or right spiral sawtooth-shaped threads and a cone (1) are close combined with casing pipes. The oil pipe anchoring device for a screw pump not only prevents a pipe post from downward walking, but also prevents the pipe post from rotating. The oil pipe anchoring device for a screw pump. Realizes a reliable anchoring function.

Description

Screw pump oil pipe anchor

The utility model relates in the petroleum production, be used for a kind of screw pump oil pipe anchor of subsurface progressive cavity tubing string anti-rotation.

When using screw pump oil production,,, just can cause tubing string to thread off, make oil well not only can not keep ordinary production, also can cause the repetition operation, even can cause workover to stop production if do not take grappling measure or grappling unreliable because rotor rotates to stator one opposite force.Existing anchor can only anchoring string upper and lower motion, not good to the anti-rotation effect of screw pump tubing string, thereby limited application to novel power saving screw rod oil extraction pump.

The purpose of this utility model is to solve the tubing string anti-rotation grappling problem of screw pump in using, design a kind of easy to use, the grappling reliable performance, screw pump oil pipe anchor.

The technical solution of the utility model screw pump oil pipe anchor is, on the basis of existing anchor with its improvement.In order to prevent that tubing string from rotating the dropout that causes tubing string, is provided with the buttress thread form of a left side or the big helical pitch of dextrorotation on the arc face outside slips (2).

The utility model compared with the prior art, this screw pump oil pipe anchor can prevent that tubing string is descending, can stop the rotation of tubing string again, thus when having realized with screw pump oil production to the reliable grappling of tubing string.This screw pump oil pipe anchor is the desirable match equipment of screw pump oil production.

In order further the structure of the utility model screw pump oil pipe anchor to be had gained some understanding, details are as follows in conjunction with its specific embodiment:

Embodiment, screw pump oil pipe anchor.

Accompanying drawing is the structural representation of the utility model screw pump oil pipe anchor.

With reference to accompanying drawing, the structure of this screw pump oil pipe anchor includes the top that is being fastenedly connected below the cone (1) and is provided with length, the track pipe (11) of short track, sheathed slip spider (4) outside track pipe (11), the centralizer body (7) of the protruding eaves of two ends band, slip ring sleeve (10), being equipped with three on slip spider (4) wraps in outside the cone (1), its outer arc face is provided with a left side or dextrorotation buttress thread form, internal surface has the slips (2) of the tapering that matches with cone (1), on the outside neutral position of slips (2), be provided with a garter spring (3), intermediate groove place on the centralizer body (7) of slip spider (4) below, be provided with the righting block (6) that has three spring holes on four walls, be provided with the stage clip (5) that withstands on centralizer body (7) groove walls in the spring hole on the righting block (6), centralizer body (7) is by the slip ring sleeve (10) of its below of screwed connection, in slip ring sleeve (10), be provided with the slip ring (9) of an annular, also fixing the pin (8) that withstands on track pipe (11) track on the slip ring (9), and the helmet (12) that is provided with in track pipe (11) termination is formed.

The working principle of this screw pump oil pipe anchor is, when anchor is gone into the well, pin (8) is positioned at the short track upper dead center on the track pipe (11), slips (2) leaves cone (1), slips (2) and set upright part and rely on righting block (6) can not fall to the track lower dead centre of track pipe (11) automatically with the frictional force of casing wall.In the process of going into the well, be no more than an anti-seat distance as long as go up raisings degree, then pin (8) does not switch tracks, and guarantees that promptly pin (8) migrates in short track, slips (2) just can spreading, can be successfully under to giving fixed position.

When anchor down after give fixed position, as long as the upper lifting pipe post is to suitable height (this moment is because the frictional force between righting block (6) and casing wall makes slips (2) and set upright the part maintenance motionless), pin (8) then slides to the lower dead centre of track pipe (11) track.Transfer tubing string again, pin (8) just changes to long track migration, and cone (1) is washed slips (2) open, and slips (2) spreading is stuck in internal surface of sleeve pipe, and depended on pressure combines tightly between cone (1) and slips (2).A left side that is provided with because of slips (2) exterior arc surface or the buttress thread form of the big helical pitch of dextrorotation, it prevents that promptly tubing string is descending, prevents the tubing string rotation again, has realized reliable grappling effect.

Unfreezing, promptly cone (1) is up thereupon during the upper lifting pipe post, and it is up to lag behind cone (1) owing to slips (2) is stuck in internal surface of sleeve pipe, and when cone (1) was up, slips (2) drew under the effect of garter spring (3), realized unfreezing.

Claims

1, a kind of screw pump oil pipe anchor, it includes cone (1), slips (2), garter spring (3), slip spider (4), stage clip (5), righting block (6), centralizer body (7), pin (8), slip ring (9), slip ring sleeve (10), track pipe (11), helmet (12) forms, and it is characterized in that the exterior arc surface of slips (2) is provided with the buttress thread form of a left side or dextrorotation.