CN209179722U - A kind of self-locking packer - Google Patents

Abstract

The utility model relates to a kind of self-locking packers.Self-locking packer includes central tube, outer tube is arranged with outside central tube, centralizer body is installed on outer tube, the lower end of centralizer body is fixedly connected with reversing cover, retaining mechanism is provided between outer tube and reversing cover, retaining mechanism includes passing through the lock tube of lock ball realization axial restraint and the lock ring with reversing cover axial restraint with outer tube, outer tube has the contained structure of accommodating portion lock ball, lock tube is equipped with outer tooth, lock ring is equipped with interior tooth, fixed ring is fixedly connected with by shear pin on lock tube, central tube, which is equipped with, presses fixed ring with central tube uplink to cut the solution lock of shear pin.When packer setting, when above mentioning tubing string, self-locking structure makes outer tube tubing string will not be made to be maintained at free hang with tubing string uplink, eliminates the packing load that tubing string acts on packer, avoids tubing string from bearing pressure for a long time and is bent.

Description

A kind of self-locking packer

Technical field

The utility model relates to a kind of self-locking packers.

Background technique

It, can be by packer to oil reservoir to guarantee long-term efficient and rational development of fields in oilfield exploitation procedure Carry out oil production by layer operation.Y211 type packer has sealed reliable, and simple operation and other advantages are widely used in the leakage of oil well card, Packer is fixed on casing wall by the extruding of packing element by the weight of tubing string itself after Y211 type packer setting, oil pipe When column keeps setting load for a long time, itself can generate bending, can generate eccentric wear with the rod string inside tubing string.

Authorization Notice No. is that the Chinese utility model patent specification of 2690581 Y of CN discloses a kind of underground work card Watt packer, which includes upper and lower connector, righting part (i.e. centralizer body), slips part (i.e. slips Assembly), hermetic unit (i.e. packing element group) and commutation part, commutation part include reversing cover, commutation set upper side is by screw thread and helping Roman connection, lower end are symmetrily processed with straight trough and helicla flute, and straight trough and helicla flute form hook together, be connected with and change in lower contact To box cupling, it is symmetrically installed with guide pin (i.e. boss) on the box cupling that commutates, boss can move under the guiding role of hook.

Above-mentioned underground work anchor packer sets symbol to the application of packing element group when in use, by the weight of tubing string It closes, guarantees packing element group Expansion sealing, to keep the state that sets of packer, tubing string needs to remain the pressure to packing element group Power, such tubing string keep pressurized state that can generate bending for a long time, when carrying out oil pumping operation by the central tube of packer, Eccentric wear is generated between rod string and tubing string, affects the mining operations in oil field.

Utility model content

The purpose of this utility model is to provide can be real when a kind of annular space between packer setting oil pipe and casing It is existing self-locking, to shed the weight of tubing string, tubing string is avoided curved self-locking packer occur.

In order to solve the above-mentioned technical problem, the technical solution of the self-locking packer of the utility model are as follows:

Scheme 1: a kind of self-locking packer, including central tube, the central tube are arranged with outer tube outside, install on the outer tube There is centralizer body, the lower end of centralizer body is fixedly connected with reversing cover, and retaining mechanism is provided between the outer tube and reversing cover, locks Mechanism includes with outer tube by the lock tube of lock ball realization axial restraint and the lock ring with reversing cover axial restraint, and outer tube, which has, to be accommodated The contained structure of part lock ball, lock tube are equipped with outer tooth, and lock ring is equipped with and is engaged with the outer tooth on lock tube to prevent lock tube upward Mobile interior tooth is fixedly connected with fixed ring by shear pin on lock tube, fixed ring have the seal face for compressing lock ball and It is moved up in self-locking packer deblocking so that lock ball is detached from the bit architecture that allows of outer tube, is had between fixed ring and lock tube for solid Determine the surplus capacity that ring moves up, central tube, which is equipped with, presses fixed ring with central tube uplink to cut the unlock of shear pin Seat, the fixed ring, which has, to be cooperated with solution lock press to cut the press end of shear pin.

The beneficial effect of the technical solution is: when packer setting, pass through lock ball axial restraint between lock tube and outer tube, Be engaged by outer tooth with interior tooth between lock tube and lock ring, by outer tube, retaining mechanism, reversing cover and centralizer body connect into one it is whole Body is fixed on casing, and when above mentioning tubing string, outer tube will not make tubing string be maintained at free sagging type with tubing string uplink State eliminates the packing load that tubing string acts on packer, avoids tubing string from bearing pressure for a long time and is bent, subtracts The eccentric wear between tubing string and rod string is lacked.

Scheme 2: self-locking packer according to scheme 1, the inner wall of the fixed ring are along far from lock tube orient diameter The cascaded surface of increase, the lesser inner wall of the internal diameter of fixed ring are the seal face for compressing lock ball, the inner wall of fixed ring being relatively large in diameter Space between the outer wall of lock tube is to allow bit architecture.Space between the inner wall and lock tube of the cascaded surface type of fixed ring is lock ball Move radially allow bit architecture, ladder face structure is easy to process.

Scheme 3: according to self-locking packer described in scheme 2, the lower end of the central tube is connected with lower contact, lower contact tool The solution lock ring of end face thereon is had more than, the lower contact and unlock ring form solution lock, the upper surface of the solution lock ring and fixation The lower end surface press cooperation of ring is to cut shear pin.Solution lock ring is added in lower contact, and fixed ring is pressed by solution lock ring and is cut Shear pin, solution lock ring are more uniform to the axial pressure distribution applied on the end face of fixed ring.

Scheme 4: the inner wall of the self-locking packer according to any one of scheme 1-3, the reversing cover is equipped with inner shaft Shoulder, the centralizer body have the mating surface cooperated with the interior shaft shoulder of reversing cover, and the lock ring press is assemblied in the interior shaft shoulder and righting Between the mating surface of body.Lock ring is connected between the interior shaft shoulder of reversing cover and the mating surface of centralizer body, the installation fixation side of lock ring Formula is simple.

Scheme 5: self-locking packer according to scheme 4, the lock ring are split type structure, the lock including being equipped with interior tooth Ring body and the lock ring seat being connected between lock ring ontology and the mating surface of centralizer body.Lock ring is divided into two structures, and lock ring seat is Tubular structure, convenient for materials, lock ring ontology axial length is shorter, interior tooth easy to process.

Scheme 6: according to self-locking packer described in scheme 5, the counterface between the lock ring ontology and lock ring seat is Tapered surface.Lock ring seat has the pressure for being radially orientated axis direction to lock ring ontology, increases stinging between lock ring ontology and lock tube With joint efforts.

Scheme 7: the self-locking packer according to any one of scheme 1-3, on the outer tooth and lock ring on the lock tube Interior tooth is engaged zigzag engagement tooth.It is upward in the axial direction to lock tube that zigzag engagement tooth increases lock ring Pressure, it is more preferable for unidirectional limit effect.

Scheme 8: the self-locking packer according to any one of scheme 1-3, the appearance of accommodating portion lock ball on the outer tube Micro-nano structure is the groove being adapted to the spherical surface of lock ball.The structure of groove is easy to process.

Scheme 9: the self-locking packer according to any one of scheme 1-3 has between the central tube and outer tube and uses In the dosing channel for filling medical fluid into oil well.It dosing channel can be in packer setting to progress dosing operation in oil well.

Scheme 10: the top of self-locking packer according to scheme 9, the central tube is equipped with outer shoulder, the outer tube Top be equipped with the annular convex platform that be adapted to the outer shoulder of center-side, equipped in packer between the annular convex platform and outer shoulder Separate dosing channel when setting test the sealing ring of envelope operation.Sealing ring, which can separate dosing channel, makes tubing string and casing Between be fully sealed, convenient for carrying out testing envelope operation to setting for packer.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the embodiment 1 of the self-locking packer of the utility model；

Fig. 2 is the partial structurtes enlarged diagram of Fig. 1.

It is respectively marked in figure: 1. central tubes；2. sealing ring；3. outer tube；Packing element group on 4.；5. ring is compressed on；6. nipple；7. Lower compression ring；8. lower rubber cylinder group；9. slips assembly；10. centralizer body；11. retaining mechanism；12. solving lock ring；13. reversing cover；14. Boss；15. lower contact；16. outer shoulder；17. annular convex platform；18. dosing channel；19. cone；20. slips；21. hook；111. Lock ring seat；112. lock tube；113. shear pin；114. lock ball；115. fixed ring；116. lock ring ontology；117. engaging tooth.

Specific embodiment

The embodiment 1 of the self-locking packer of the utility model when being used in the present specification with packer as shown in Figure 1, lean on Subaerial one end is upper end, and one end close to shaft bottom is lower end, and self-locking packer includes central tube 1, is socketed with outside central tube 1 Outer tube 3, central tube 1 are hollow tubular structure, and internal diameter is identical with pipe aperture, and the upper end of central tube 1 is equipped with being used for and oil pipe The lower end of the internal screw thread of connection, central tube 1 is threadedly coupled with lower contact 15 and is formed sealing, and the upper end of central tube 1 is equipped between outer land Shoulder 16；The top of outer tube 3 is equipped with the annular convex platform 17 being adapted to outer shoulder 16, and the inner wall of annular convex platform 17 is interior axially upward The tapered surface that diameter is gradually increased, is equipped with sealing ring 2 between outer shoulder 16 and annular convex platform 17, sealing ring 2 connects with annular convex platform 17 The lower end of touching is equipped with the tapered surface being adapted to the tapered surface of annular convex platform 17, sealing ring and annular convex platform and is cooperated in fact by tapered surface Existing taper sealing, guarantee are tested envelope operation and are gone on smoothly；The internal diameter of outer tube 3 is greater than the outer diameter of central tube 1, outer tube 3 and central tube 1 it Between gap form the dosing channel 18 that erosion-resisting medicament is filled into well.

It is arranged with spaced two groups of packing element groups on outer tube 3, two groups of packing element groups include upper packing element group 4 and lower rubber cylinder group 8, Accommodation space with the leakage point in containment sheath between upper packing element group 4 and lower rubber cylinder group 8, the upper end of upper packing element group 4 and outer The annular convex platform 17 of pipe 3 abuts, and the lower end of upper packing element group 4 is equipped with upper compression ring 5, and the upper end of lower rubber cylinder group 8 is equipped with lower compression ring 7, nipple 6 is equipped between upper compression ring 5 and lower compression ring 7, nipple 6 and upper compression ring 5, the cooperation of lower compression ring 7 are in glue Playing the role of limit to packing element group when cylinder group extrusion expansion, nipple can transmit pressure between compression ring above and below, and Nipple can keep the accommodation space between two packing element groups, guarantee the leakage point on casing blocked two groups of packing element groups it Between.The lower section of lower rubber cylinder group 8 is connected with cone 19, slips 20 in turn, and cone 19 and slips 20 form slips assembly 9, and slips is total Be connected with centralizer body 10 at 9 lower section, cone 19, slips 20, centralizer body 10 structure and be installed as the prior art, do not do herein Narration in detail.

The lower thread of centralizer body 10 is connected with reversing cover 13, and reversing cover 13 has a hook 21, along its week in lower contact 15 To two boss 14 being arranged symmetrically are equipped with, hook 21 is hooked with boss 14 to be cooperated, and reversing cover 13 is equipped with to be oriented to boss 14 Cooperate the track to realize packer setting or deblocking.Retaining mechanism 11 is equipped between reversing cover 13 and outer tube 3.

Retaining mechanism 11 includes the lock tube 112 being connect with outer tube 3 by 114 axial restraint of lock ball and axial with reversing cover 13 The lock ring of relatively fixed connection, in this embodiment, lock ring is split type structure, including lock ring ontology 116 and with lock ring ontology The 116 lock ring seats 111 abutted, in other embodiments, lock ring seat and lock ring ontology may be integral structure；Lock tube 112 Outer wall be equipped with outer tooth, the inner wall of lock ring ontology 116, which is equipped with, to be cooperated with the outer tooth on lock tube 112 in packer setting It prevents lock tube 112 from moving axially upwards and then realizes the locked interior tooth of outer tube axially upward direction, in this embodiment, outer tooth With interior tooth be it is zigzag engage tooth 117, in other embodiments, outer tooth and interior tooth may be trapezoidal thread.Lock ring sheet The top of body 116 and the bottom end of lock ring seat 111 are equipped with mutually compatible along the central tube taper that axially downwardly diameter is gradually increased Face, tapered surface make 111 pairs of lock ring ontologies 116 of lock ring seat have the pressure for being radially orientated axis, increase lock ring ontology and lock tube it Between bite force.The inner wall of reversing cover 13 is equipped with the interior shaft shoulder, and centralizer body 10 has matches with what the interior shaft shoulder of reversing cover 13 cooperated Conjunction face, lock ring ontology 116 and 111 abuts assembling of lock ring seat between the interior shaft shoulder of reversing cover 13 and the mating surface of centralizer body 10, Reversing cover 13 and the mating surface 10 of centralizer body fix lock ring ontology 116 and 111 axial limiting of lock ring seat.The outer wall of lock tube 112 For forge piece of step type structure, upper end outer diameter is greater than the outer diameter of lower end, and the upper end of the outer wall of lock tube 112 is equipped with engagement tooth 117, lower end passes through Lock ball 114 is fixedly connected with outer tube 3, and outer tube 3 is equipped with the contained structure being partially submerged into for lock ball 114, is held in the embodiment Micro-nano structure is groove, and in other embodiments, contained structure may be the pit being adapted to the spherical surface of lock ball；Lock ball 114 Diameter is greater than the thickness of the lower end of lock tube 112, and the lower end of lock tube 112 is fixedly connected by shear pin 113 with fixed ring 115, There are the surplus capacity moved up for fixed ring 115 between fixed ring 115 and the upper end of lock tube 112, the inner wall of fixed ring 115 is Lower section internal diameter is greater than the cascaded surface of top internal diameter, and the lesser inner wall of the internal diameter of fixed ring 115 forms the seal face for compressing lock ball 114 Lock ball is fixed in the groove of outer tube 3, the gap shape between the biggish inner wall of 115 internal diameter of fixed ring and the lower end of lock tube 112 Bit architecture is allowed for what lock ball 114 was detached from out of outer tube groove at when fixed ring 115 is moved up.The upper end of lower contact 15 has super Cross the solution lock ring 12 of end face thereon, Xie Suohuan 12 and lower contact 15 constitute solution lock, and in other embodiments, solution lock can also be with For the solution lock ring being directly fixedly connected with central tube；The lower end of fixed ring 115 is formed with the solution press cooperation of lock ring 12 to cut The press end of pin 113 is cut, in other embodiments, also can be omitted the solution lock ring 12 in lower contact 15, by fixed ring 115 Lower end extends to make it have holds beyond lock tube 112 and exceeding for lock ring ontology 116, should be to cooperate with the press of lower contact 15 beyond end Press end.

Self-locking packer when in use, is connected on tubing string and is dropped to tubing string and set by above-mentioned self-locking packer Depthkeeping degree makes packing element group 4, lower rubber cylinder group 8 be respectively placed in the upper and lower ends of the leakage point of casing, above mentions oil pipe, outer tube 3 and its On element be kept fixed under the action of the frictional force of centralizer body 10 and casing, the boss 14 of lower contact 15 is produced into reversing cover 13 hook 21, lower drain line, slips assembly 9 are opened and are fixed on casing wall, and lower drain line, the between outer land of central tube 1 are continued Shoulder 16 squeezes sealing ring 2 and 3 downlink of outer tube compresses upper packing element group 4 and lower rubber cylinder group 8, and two groups of packing element group extrusion expansions are realized To the sealing between oil pipe and casing, when 3 downlink of outer tube, 112 downlink of lock tube, lock tube 112 and lock ring sheet are driven by lock ball 114 The engaged realization of zigzag engagement tooth 117 on body 116 is self-locking, and retaining mechanism 11 enters self-locking state, makes outer tube 3 will not It moves axially upwards, to ensure that packing element group, lower rubber cylinder group 8 cannot be sprung back, self-locking packer realization is set, and is sealed simultaneously Dosing channel 18 between 2 closing center's pipe 1 of ring and outer tube 3.Annular space into tubing string and casing squeezes into workover fluid, by annular space Interior pressure is suppressed most 15MPa and is kept for 15 minutes, and pressure does not drop in annular space, tests sealing lattice；Oil pipe a distance is above proposed, in 1 uplink of heart pipe, outer tube 3 remain stationary, and the sealing ring 2 between central tube 1 and outer tube 3 is released, and dosing channel 18 is opened, Shaft bottom is flowed into from the medical fluid that well head fills from dosing channel 18, realizes dosing operation；Oil pipe is now in free sagging type simultaneously State, oil pipe are applied on self-locking packer and set load release, eliminate the pressure between tubing string and casing, avoid oil pipe Being bent and exacerbating the friction phenomenon between rod string and tubing string occur in column.When needing to lift tubing string, oil pipe is above mentioned, It is remained stationary under outer tube 3 and frictional force of the element between packing element group and casing thereon, the unlock in lower contact 15 12 uplink of ring simultaneously presses against 115 lower end of fixed ring, and under the active force that tubing string above mentions, Xie Suohuan 12 is applied to fixed ring 115 On active force cut shear pin 113,115 uplink of fixed ring, the biggish lower end of 115 internal diameter of ring to be fixed moves to lock ball At 114, lock ball 114 is detached from out of groove on outer tube 3, and outer tube 3 is released and with 1 uplink of central tube, upper packing element group 4, lower glue 8 rebound of cylinder group, self-locking packer deblocking can play fuel-displaced tubing string.

The embodiment 2 of the self-locking packer of the utility model, the difference from embodiment 1 is that: omit lock ring ontology and lock The tapered surface abutted between ring seat is abutted between lock ring ontology and lock ring seat by horizontal end face.

The embodiment 3 of the self-locking packer of the utility model, the difference from embodiment 1 is that: pass through righting in embodiment 1 The axial restraint to lock ring is realized in the lower end surface of body and the interior shaft shoulder cooperation of reversing cover, naturally it is also possible in reversing cover upper and lower ends Setting two interior shaft shoulders in interval install lock ring between two interior shaft shoulders to realize the axial restraint to it.

The embodiment 4 of the self-locking packer of the utility model, is with the difference for implementing 1: fixed ring is for lock in embodiment 1 Ball disengaging groove allows bit architecture to be provided by the lower end of its stepped inner wall, naturally it is also possible to which the inner wall of fixed ring is set as straight Groove is arranged in the corresponding position of the lower end of the inner wall of fixed ring to accommodate lock ball so that lock ball is detached from outer tube in cartridge type.

Claims (10)

1. a kind of self-locking packer, including central tube, it is characterised in that: outer tube is arranged with outside the central tube, on the outer tube Centralizer body is installed, the lower end of centralizer body is fixedly connected with reversing cover, is provided with retaining mechanism between the outer tube and reversing cover, Retaining mechanism includes with outer tube by the lock tube of lock ball realization axial restraint and the lock ring with reversing cover axial restraint, and outer tube has The contained structure of accommodating portion lock ball, lock tube are equipped with outer tooth, and lock ring is equipped with and is engaged with the outer tooth on lock tube to prevent lock tube The interior tooth moved up, is fixedly connected with fixed ring by shear pin on lock tube, and fixed ring has the seal face for compressing lock ball With moved up when self-locking packer unseals so that lock ball be detached from outer tube allow bit architecture, have between fixed ring and lock tube and supply The surplus capacity that fixed ring moves up, central tube, which is equipped with, presses fixed ring with central tube uplink to cut the unlock of shear pin Seat, the fixed ring, which has, to be cooperated with solution lock press to cut the press end of shear pin.

2. self-locking packer according to claim 1, it is characterised in that: the inner wall of the fixed ring is along far from lock tube side The cascaded surface increased to diameter, the lesser inner wall of the internal diameter of fixed ring are the seal face for compressing lock ball, and fixed ring is relatively large in diameter Inner wall and lock tube outer wall between space be to allow bit architecture.

3. self-locking packer according to claim 2, it is characterised in that: the lower end of the central tube is connected with lower contact, Lower contact has the solution lock ring more than end face thereon, and the lower contact and unlock ring form solution lock, the upper end for solving lock ring Face and the press cooperation of the lower end surface of fixed ring are to cut shear pin.

4. self-locking packer according to any one of claim 1-3, it is characterised in that: set on the inner wall of the reversing cover There is the interior shaft shoulder, the centralizer body has the mating surface cooperated with the interior shaft shoulder of reversing cover, and the lock ring press is assemblied in the interior shaft shoulder Between the mating surface of centralizer body.

5. self-locking packer according to claim 4, it is characterised in that: the lock ring is split type structure, including is equipped with The lock ring ontology of interior tooth and the lock ring seat being connected between lock ring ontology and the mating surface of centralizer body.

6. self-locking packer according to claim 5, it is characterised in that: the cooperation between the lock ring ontology and lock ring seat End face is tapered surface.

7. self-locking packer according to any one of claim 1-3, it is characterised in that: outer tooth and lock on the lock tube Interior tooth on ring is engaged zigzag engagement tooth.

8. self-locking packer according to any one of claim 1-3, it is characterised in that: accommodating portion is locked on the outer tube The contained structure of ball is the groove being adapted to the spherical surface of lock ball.

9. self-locking packer according to any one of claim 1-3, it is characterised in that: between the central tube and outer tube With the dosing channel for filling medical fluid into oil well.

10. self-locking packer according to claim 9, it is characterised in that: the top of the central tube is equipped with outer shoulder, institute The top for stating outer tube is equipped with the annular convex platform being adapted to the outer shoulder of center-side, is equipped between the annular convex platform and outer shoulder Separate dosing channel when packer setting test the sealing ring of envelope operation.