CN202954764U

CN202954764U - Hydraulic anchor

Info

Publication number: CN202954764U
Application number: CN 201220590523
Authority: CN
Inventors: 顾正达; 冯恩山; 徐成林
Original assignee: Funing County Hongda Petrochemical Machinery Co Ltd
Current assignee: Funing County Hongda Petrochemical Machinery Co Ltd
Priority date: 2012-10-24
Filing date: 2012-10-24
Publication date: 2013-05-29
Anticipated expiration: 2022-10-24

Abstract

The utility model provides a hydraulic anchor which comprises an upper joint, a piston, an upper cone body, a central pipe, slips, slip sleeves, a lower cone body, an oil drainage sleeve and a lower joint. The piston, the slip sleeves and the oil drainage sleeve are respectively sleeved on the upper portion, the middle portion and the lower portion of the central pipe. The upper end of the central pipe is connected with the upper joint, and the lower end of the central pipe is connected with the lower joint through a locking block. The upper cone body and the lower cone body are sleeved on the central pipe. Spline steps of the upper cone body are connected with those of the piston through sliding pins. Cone face steps of the upper cone body are connected with the steps of the slip sleeves, and cone face steps of the lower cone body are connected with the steps formed by that the slip sleeves are connected with limiting rings. The slips are arranged on the central pipe, the cone face of the upper cone body and the cone face of the lower cone body, and arranged inside slip grooves. The tail portion of the lower cone body is connected with the oil drainage sleeve. Locking rings and inner clamping sleeves are sleeved on the central pipe of the inner side of the upper cone body. Anti-corrosion wear-resistant liner pipes are arranged inside the upper joint, the central pipe and the lower joint. The hydraulic anchor can anchor a downhole tubing string to improve the pumping efficiency, and crude oil in the tubing string can be discharged when the tubing string is raised, so that pollution of a wellhead is prevented.

Description

Hydraulic anchor

Technical field

The utility model relates to a kind of for grappling downhole oil tubing string raising pump efficiency, and has the Hydraulic anchor of oil draining function.

Background technology

In sucker rod pumping technique, motion due to polished rod, oil pipe bears fluctuating load, and during upstroke, oil pipe shortens because of unloading, during down stroke, oil pipe extends because of stand under load, and this not only can increase the loss of plunger stroke of polished rod, and because of the impact of the factors such as resistance vibrations, cause the unfavorable factors such as tubing bending, side attrition of rod string and load increase, thereby shorten the life-span of rod tube.In addition, when well workover plays lower tubular column, the crude oil in oil pipe can be taken out of well head, pollutes.

Summary of the invention

The purpose of this utility model just be to provide a kind of can grappling the downhole oil tubing string, prevent string creep and bending, raising pump efficiency, can when playing the downhole oil tubing string, automatically release the Hydraulic anchor of oil pipe Crude Oil again.

The utility model solves the technical scheme that its technical problem adopts: this Hydraulic anchor is comprised of top connection, piston, lock ring, upper cone, central tube, slips, slip sleeve, lower cone, draining cover, lock dog, lower contact etc., piston, slip sleeve, draining cover are placed in respectively the upper, middle and lower section of central tube, the central tube upper end is connected with top connection, and lower end is connected with lower contact by lock dog; Upper/lower cone is placed on central tube, the spline step of upper cone is connected by sliding pin with the spline step of piston, the cone step of upper cone is connected with the step of slip sleeve, the step formed after the cone step of lower cone is connected with spacing ring with slip sleeve is connected, slips is positioned on central tube and the upper/lower cone conical surface, and be placed in the slip groove of slip sleeve, the lower cone afterbody is connected with the draining cover; On the inboard central tube of upper cone, cover has lock ring and interior cutting ferrule; Set pin by top connection and plunger lock; The deblocking pin is by draining cover and lower contact locking; Pin sleeve is threaded connection at draining and puts, and fixed solution offset nail; Top connection, central tube, lower contact endoporus all are provided with the bushing pipe of anticorrosion antiwear; The top connection external cylindrical surface is provided with righting strip, the lock tooth that be provided with the hydraulic pressure hole on central tube, matches with lock ring and the step that piston moves downward while being limited in deblocking; Draining puts and is provided with the draining hole.

During use, Hydraulic anchor is connected on tubing string, after arriving the downhole designs degree of depth down, by well head, hydraulic pressure is injected to central tube, hydraulic pressure enters the piston sap cavity through central tube hydraulic pressure hole, promote piston forward, when hydraulic pressure reaches certain value, setting pin is cut off, piston just continues forward under the effect of hydraulic pressure, now, cutting ferrule in piston promotes, lock ring, upper cone together forward, because lower cone maintains static, slips is upper, under the extruding of lower cone, overcome the sheet spring force and strut, until be anchored on casing wall, now, lock ring just in time with central tube on lock tooth engagement, upper cone is locked, lose hydraulic coupling and can also continue to keep the grappling state.When needs play down-hole string, the upper lifting pipe post, top connection drives central tube and slips anchoring mechanism produces relative displacement, the deblocking pin is cut off, lock dog falls back near the draining hole, loses the support force of draining cover, causes central tube and lower contact to separate, the Action of Gravity Field that lower contact is subject to tail pipe and crude oil in oil pipe moves down, and drives draining cover and lower cone simultaneously and moves down; And now, top connection drives piston, upper cone upwards by the step on central tube, slips has just lost the support of upper/lower cone, under the effect of sheet spring, reclaims.In the process of separating in central tube and lower contact, sealing between central tube and lower contact is destroyed, overflow at the position, draining hole that crude oil in tubing string will put through draining, along with down-hole string progressively on propose recovery, crude oil in oil pipe also can progressively be let out down-hole, therefore can not pollute at well head.

The beneficial effects of the utility model are, can grappling downhole oil tubing strings, prevent string creep and bending, raising pump efficiency, can when playing the downhole oil tubing string, automatically release the oil pipe Crude Oil again, and do not pollute well site, be convenient to protection of the environment.

The accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Accompanying drawing is structural representation of the present utility model.

In accompanying drawing 1, top connection; 2, set pin; 3, piston; 4, hydraulic pressure hole; 5, interior cutting ferrule; 6, sliding pin 7, lock ring; 8, upper cone; 9, central tube; 10, slips; 11, sheet spring; 12, slip sleeve; 13, lower cone; 14, spacing ring; 15, draining cover; 16, draining hole; 17, lock dog; 18, sealing ring; 19, deblocking pin; 20, pin sleeve; 21, lower contact; 22, bushing pipe.

The specific embodiment

As shown in drawings, central tube 9 upper, middle and lower sections overlap respectively piston 3, slip sleeve 12, draining cover 15; Central tube 9 upper ends are connected by screw thread with top connection 1, set pin 2 by top connection 1 and piston 3 lockings; Upper cone 8 is placed on central tube 9, and its cone step is connected with the step of slip sleeve 12, and its spline step is connected by sliding pin 6 with the spline step of piston 3; Lock ring 7, interior cutting ferrule 5 are positioned at upper cone 8 rear sides, are placed on central tube 9, and lock ring 7 inboards are provided with the shape of threads tooth; Lower cone 13 is placed on central tube 9, and the step formed after the cone step of lower cone 13 is connected with spacing ring 14 with slip sleeve 12 is connected, and its afterbody is threaded with draining cover 15; Lock dog 17 is positioned at draining cover 15, is subject to the support of draining cover 15, and for locked-center pipe 9 and lower contact 21, deblocking pin 19 is by draining cover 15 and lower contact 21 lockings; Pin sleeve 20 is threaded connection on draining cover 15, and fixed solution offset nail 19; Be provided with rectangle slips groove on slip sleeve 12, slips 10 is placed on central tube 9, is positioned at the slip groove of slip sleeve 12; Between slips 10 and central tube 9, certain gap is arranged, so that the conical surface of upper cone 8, lower cone 13 stretches into, between slips 10 and slip sleeve 12, sheet spring 11 is arranged, when slips 10 opens grappling, sheet spring 11 is in compressive state; Be provided with hydraulic pressure hole 4 at central tube 9 corresponding to the position of piston 3, corresponding to the outer tube wall at upper cone 8 positions, be provided with the lock tooth matched with lock ring 7 internal tooths; Be equipped with sealing ring 18 with top connection 1, central tube 9 with lower contact 21 contact positions at central tube 9 and piston 3, piston 3; Top connection 1, central tube 9, lower contact 21 endoporus all are provided with the bushing pipe 22 of anticorrosion antiwear.

Claims

1. a Hydraulic anchor, by top connection, piston, lock ring, upper cone, central tube, slips, slip sleeve, lower cone, draining cover, lock dog, lower contact, formed, it is characterized in that: piston, slip sleeve, draining cover are placed in respectively the upper, middle and lower section of central tube, the central tube upper end is connected with top connection, and lower end is connected with lower contact by lock dog; Upper/lower cone is placed on central tube, the spline step of upper cone is connected by sliding pin with the spline step of piston, the cone step of upper cone is connected with the step of slip sleeve, the step formed after the cone step of lower cone is connected with spacing ring with slip sleeve is connected, slips is positioned on central tube and the upper/lower cone conical surface, and be placed in the slip groove of slip sleeve, the lower cone afterbody is connected with the draining cover; On the inboard central tube of upper cone, cover has lock ring and interior cutting ferrule; Set pin by top connection and plunger lock; The deblocking pin is by draining cover and lower contact locking; Pin sleeve is threaded connection at draining and puts, and fixed solution offset nail; Top connection, central tube, lower contact endoporus all are provided with the bushing pipe of anticorrosion antiwear.

2. Hydraulic anchor according to claim 1, it is characterized in that: the top connection external cylindrical surface is provided with righting strip, the lock tooth that be provided with the hydraulic pressure hole on central tube, matches with lock ring and the step that piston moves downward while being limited in deblocking; Draining puts and is provided with the draining hole.