CN2528926Y

CN2528926Y - Packer

Info

Publication number: CN2528926Y
Application number: CN 01262199
Authority: CN
Inventors: 逯国成; 杜永欣; 李啸南; 吉树鹏
Original assignee: Oil Production Technology Research Institute of Sinopec Shengli Oilfield Co
Current assignee: Oil Production Technology Research Institute of Sinopec Shengli Oilfield Co
Priority date: 2001-10-18
Filing date: 2001-10-18
Publication date: 2003-01-01
Anticipated expiration: 2011-10-18

Abstract

The utility model discloses a releasing packer, which comprises a stress application mechanism, a locking and de-blocking mechanism, a sealing mechanism and an anchoring mechanism as well as a releasing and an emergency releasing mechanism. The mechanism mainly comprises a locking claw internal sleeve, a sliding sleeve, a locking claw, a releasing shear pin, a support ring, a screw cap, etc. one end of the mechanism is clamped on one end surface of a central tube through a step of the locking claw, the other end of the mechanism is connected with the internal central tube while being connected with other mechanisms organically to form a whole. When conventional releasing is out of use, right rotating of an oil tubular column can realize releasing. The releasing and emergency releasing mechanism can be widely applied tovarious suspended releasing packers and can also be applied toother similar tools.

Description

Back-off packer

One, technical field

The utility model relates to packer, relates in particular to a kind of back-off packer.

Two, background technology

The on-the-spot used back-off packer of oil exploitation at present, generally adopt outside releasing gadget, increasing the emergent releasing gadget of a cover, adopt the machinery mode of giving up, utilize shear pin will trip out part and stay well partly to be connected, when using this to overlap mechanism, the upper lifting pipe post is cut off shear pin, make tripping out part and staying well partly to be separated of packer, reach the purpose of giving up.But there is following problem in this mechanism: if the shearing force of shear pin is too little, when the suspended weights below the packer is big, shear pin is cut off in generation midway easily in the process of going into the well, and makes tripping out part and staying the well part to separate of packer midway, causes the well accident; If the shearing force of shear pin is bigger, the required strength of upper lifting pipe post increases, and the well head power-equipment often can not meet the demands, and also easily causes the accident; Latus rectum problem of smaller in also existing simultaneously brings many troubles for the coupling and the technological measure of follow-up kit.

Three, summary of the invention

The technical problem that the utility model solves is to overcome and avoid above-mentioned the deficiencies in the prior art and shortcoming, and a kind of to have an interior latus rectum big and provide, and gives up easily reliably the safety of going into the well, the back-off packer of advantages of simple structure and simple.

The technical scheme that the utility model is dealt with problems is: the back-off packer that comprises boosting mechanism, locks and separate sealing mechanism, sealing mechanism and anchor mechanism, comprise also and giving up and emergent releasing gadget that this mechanism comprises cover, sliding sleeve, lock ring, the shear pin of giving up, support ring and nut in the lock pawl.One end of this mechanism is stuck on the end face of central tube by the step of lock pawl, and the other end is connected with inner central tube.

Intermeshing keyway and key are arranged on top connection and power transmission and the cylinder sleeve, in the process of going into the well, the problem of mutually rotating can not take place between each component, thereby avoided packer that the rotation owing to tubing string causes case accident midway.Cylinder sleeve is one to have the tubulose mechanism of interior step, and there is the key that is meshed with keyway at its two ends, and cover is tubular structure in the lock pawl, constitutes emergent screw pair of giving up with the lock pawl.The lock pawl is the claw-like structure, and there is outer step the end of its pawl, and its step may be stuck on the end face of central tube, and the suspended weights of packer is heightened.

The utility model has following advantage compared with prior art:

1. normally give up and emergent releasing gadget is superimposed, make the structure of packer compact more, flexible operation is reliable;

2. emergent releasing gadget adopts screw pair, has increased the suspended weights of packer; The place, joint portion of staying well part and tripping out part has intermeshing key and keyway to prevent effectively that packer from going into the well to rotate the problem that comes off midway because of tubing string in the process;

3. mechanism's compactness is easy to assembly, is easy to processing.

Four, description of drawings

Accompanying drawing is total assembling structure sectional plan view of the utility model embodiment.

Five, the specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing: as shown in the figure, give up and the lock pawl of emergent releasing gadget in cover 26 link to each other with inner central tube 9, load onto sealing ring 21 on the sliding sleeve 27 and pack into the lock pawl in the cover 26 in, lock pawl 28 is connected in the lock pawl and overlaps on 26, constitute screw pair, and the outer step of lock pawl 28 is closely contacted with central tube 11 1 end faces.Support ring 30 and nut 32 are contained on the sliding sleeve 27 successively.Lower contact 34 is connected with central tube 11, and centering ring 33 is contained in the lower contact 34.

The top connection 1 of boosting mechanism is connecting inner central tube 9, by pin 2 cylinder sleeve 7 is fixed in the top connection 1, seat is sealed piston 6 pack in the cylinder sleeve 7.Sealing ring 3 is contained in the top connection 1, and sealing ring 4,5 is contained on the piston 6.This boosting mechanism and give up and emergent releasing gadget constitutes the part that trips out of this packer.

Lock and separate sealing mechanism and comprise power transmission cover 8, lock ring 10, central tube 11, fishing head 12 and overcoat 13, the external surface of the inner surface of its lock ring 10, central tube 11 1 ends has the opposite saw-tooth thread of direction respectively, and is meshing with each other.On the central tube 11 groove is arranged, the external surface of fishing head 12 has step, and its step is stuck in the groove of central tube 11.Sealing mechanism comprises upper baffle ring 15, sleeve 17, packer accessory 18 and lower baffle ring 19.Upper baffle ring 15 is contained in the sleeve 17, and packer accessory 18 and lower baffle ring 19 are contained on the sleeve 17 successively.Anchor mechanism comprises upper cone 20, slips cover 23, slips 24, flat spring 25, baffle ring 31 and lower contact 34.Upper cone 20 is contained in the slips cover 23 and is contained on the central tube 11, slips 24 and flat spring 25 are contained in the window of slips cover 23, and upper cone 20 is connected with sleeve 17, and baffle ring 31 is contained in the lower contact 34, withstand the step of lower contact 34, and be connected with slips cover 23.

This uses novel employing hydraulic base sealed and give up and emergent giving up, when under the packer behind the precalculated position, in oil pipe, throw a steel ball, steel ball drops on the conical surface of sliding sleeve 27, suppress in oil pipe, hydraulic coupling promotes piston 6, power transmission cover 8, lock ring 10 and overcoat 13 and moves down along central tube 11, and cuts off shear pin 14, promote lower cone 20 together with upper baffle ring 15, sleeve 17, packer accessory 18, lower baffle ring 19 and move down, slips 24 is radially released be supported on the casing wall; Piston 6 carries out descending, cuts off shear pin 16, only promotes power transmission cover 8, overcoat 13 and upper baffle ring 15 and moves down, and compression packer accessory 18 is radially expanded it, the sealing oil casing annular space, and lock ring 10 is locked on the saw-tooth thread of central tube 11 tightly, finishes the seat envelope.Continue rising hydraulic pressure, cut off the shear pin 29 of giving up, sliding sleeve 27 and support ring 30 are descending, and support ring 30 shifts out from the inner surface of lock pawl 28, lock pawl 28 this moment and are separated with central tube 11 because of supporting in losing, and finish and give up.If because of the shearing force of the shear pin of giving up excessive, ground installation can't reach requirement or otherwise reason, when packer can't be given up, but dextrorotation tubing string, (this moment is owing to piston 6 and power transmission cover 8 moves down, make the key of keyway from cylinder sleeve 7 on the power transmission cover 8, so the well part of staying of packer can relatively rotate with tripping out partly.) top connection 1 drives that cover 26 rotates in inner central tube 9 and the lock pawl, cover 26 constitutes screw pairs and relatively rotates in lock pawl 28 and the lock pawl, and support ring 30 is released from lock pawl 28, and lock pawl 28 breaks away from because of supporting in losing with central tube 11, gives up so realize meeting an urgent need.

When packer needs deblocking, be lowered to fishing tool, drag for fishing head 12 back upper lifting pipe posts, step on the fishing head 12 struts lock ring 10, and retaining mechanism is released, and moves on overcoat 13, drive on the upper baffle ring 15 and move, packer accessory 18 is discharged, continue the upper lifting pipe post, the step of upper baffle ring 15 contacts with the step of sleeve 17, sleeve 17 and upper cone 20 move on together, upper cone 20 and slips 24 are disengaged, and slips 24 is regained under the effect of flat spring 25, and packer gets final product deblocking.

Claims

1. back-off packer, comprise boosting mechanism, lock and separate sealing mechanism, sealing mechanism and anchor mechanism, it is characterized in that also comprising and give up and emergent releasing gadget, cover (26), sliding sleeve (27), lock pawl (28), the shear pin of giving up (29), support ring (30) and nut (32) in this mechanism's lock pawl.This mechanism's one end is stuck on the end face of central tube (11) by the step of lock pawl, and the other end links to each other with inner central tube (9).

2. back-off packer according to claim 1 is characterized in that on top connection (1) and power transmission cover (8) and the cylinder sleeve (7) intermeshing keyway (35,38) and key (36,37) being arranged.

3. back-off packer according to claim 2 is characterized in that cylinder sleeve (7) is one to have the tubular structure of interior step, and there is the key (36,37) that is meshed with keyway (35,38) at its two ends.

4. back-off packer according to claim 1 and 2 is characterized in that locking the interior cover of pawl (26) and is tubular structure, constitutes screw pair with lock pawl (28).

5. according to claim 1 or 2 or 3 described back-off packers, it is characterized in that locking pawl (28) is a claw-like structure, and there is outer step the end of its pawl.