CN115182699A

CN115182699A - Packer

Info

Publication number: CN115182699A
Application number: CN202210904400.XA
Authority: CN
Inventors: 李晓明
Original assignee: Qiqihar Yasheng Machinery Manufacturing Co ltd
Current assignee: Qiqihar Yasheng Machinery Manufacturing Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-10-14
Anticipated expiration: 2042-07-29
Also published as: CN115182699B

Abstract

The invention belongs to the field of downhole packers, and particularly relates to a packer which comprises an upper joint and a lower joint, wherein the openings of the upper joint and the lower joint are oppositely arranged and detachably connected, one end of each of the upper joint and the lower joint, which are opposite, is respectively connected with an upper oil pipe and a lower oil pipe, a sliding assembly is slidably arranged in the lower joint, a shunting mechanism communicated with the upper oil pipe is arranged in the upper joint, a hydraulic cavity is formed between the shunting mechanism and the upper joint, the top of the sliding assembly is positioned in the hydraulic cavity, the shunting mechanism is used for guiding liquid to flow to the hydraulic cavity, clamping pieces are arranged on the peripheral surface of the lower joint, elastic pieces are arranged on the sliding assembly, the sliding assembly is connected with the lower joint through a limiting mechanism, when the sliding assembly slides to the lowest height, the sliding assembly is limited, a deblocking mechanism is used for detachably connecting the lower joint and resetting the limiting mechanism, the upper joint is installed after the whole packer is fished out of a well hole through the deblocking mechanism, and the whole packer can be immediately put into other well holes so as to achieve the purpose of repeated use for multiple times.

Description

Packer

Technical Field

The invention belongs to the field of downhole packers, and particularly relates to an improvement on a packer structure.

Background

Packers, which have elastomeric sealing elements to seal off the annular space between them and the casing and isolate the producing zones to control production fluids, are widely used in drilling, cementing, testing, completion and downhole petroleum operations. The packer can be divided into a self-sealing type (code number Z), a compression type (code number Y), a wedge type (code number X) and an expansion type (code number K) according to the working principle of the packer.

For example, Y445 series releasing packer is a hydraulic setting, releasing and lifting releasing packer, and has the characteristics of sealing and large suspension load, in the application process, the lower oil pipe below the packer is supported in a well hole, the upper oil pipe above the packer is injected with hydraulic oil, the locking claw and the sealing element are expanded through hydraulic pressure, so that the effect of sealing a sleeve is realized, the locking claw and the sealing element are limited through a releasing shear pin, when other pipe fittings are required to be connected, an upper handle can be removed, and other pipe fittings are connected to perform oil pumping and other operations, in the releasing stage, the releasing shear pin is cut off through a releasing lifting tool, so that the locking claw and the sealing element are reset, and the whole packer is separated from the well hole, but the releasing shear pin is an irreversible process, so that the whole packer fails after releasing, and is not beneficial to repeated use.

Disclosure of Invention

The invention aims to provide a packer to solve the problems in the prior art, and adopts the technical scheme that:

a packer comprises an upper joint and a lower joint which are oppositely provided with openings and detachably connected, wherein the opposite ends of the upper joint and the lower joint are respectively connected with an upper oil pipe and a lower oil pipe;

the shunting mechanism is used for guiding liquid to flow to the hydraulic cavity so as to push the sliding assembly to slide downwards and enable the sliding assembly to push an elastic piece and a clamping piece to extrude the inner wall of the sleeve, the clamping piece is arranged on the peripheral surface of the lower joint, and the elastic piece is arranged on the sliding assembly and is positioned between the lower joint and the upper joint;

the sliding assembly is connected with the lower joint through a limiting mechanism, and when the sliding assembly slides downwards to the lowest height, the sliding assembly is limited;

still include deblocking mechanism, deblocking mechanism is used for dismantling the connection the lower clutch, and make stop gear resets.

Furthermore, the shunting mechanism comprises an inserting pipe, the inserting pipe is communicated with the upper oil pipe, the top of the inserting pipe is fixedly connected with the upper joint through a plurality of fixing rods, the bottom of the inserting pipe is detachably arranged in the supporting pipe and seals the supporting pipe, and the fixing rods are arranged at intervals and are positioned above the supporting pipe;

the bottom of the supporting tube is fixedly connected with the lower joint, the top of the supporting tube is positioned in the upper joint, the hydraulic cavity is formed between the peripheral surface of the supporting tube and the inner wall of the upper joint, and the sliding assembly is sleeved on the supporting tube.

Furthermore, the inserting pipe is connected with the supporting pipe through threads;

still include the ball sealer, peg graft socle portion inner wall be with the cambered surface structure of ball sealer adaptation, and be provided with the intercommunication the through-hole of stay tube, the ball sealer is used for following put into in the last oil pipe, and plug up the through-hole.

Furthermore, the sliding assembly comprises a sliding pipe sleeved on the supporting pipe, the sliding pipe is arranged in the hydraulic cavity, the bottom of the sliding pipe extends out of the upper joint, and the bottom of the sliding pipe is connected with an extrusion mechanism for pushing the elastic piece and the clamping piece to extrude the inner wall of the sleeve.

Furthermore, the extrusion mechanism comprises an upper shaft sleeve and a lower shaft sleeve, the sliding tube, the upper shaft sleeve and the lower shaft sleeve are sleeved on the supporting tube from top to bottom, the bottom of the sliding tube is fixedly connected with the top of the upper shaft sleeve, and the bottom of the upper shaft sleeve is slidably connected with the lower shaft sleeve;

the top peripheral surface of the upper shaft sleeve is provided with an upper bulge, the top peripheral surface of the lower shaft sleeve is provided with a lower bulge, and the elastic piece is of an annular structure, is sleeved on the upper shaft sleeve and is positioned between the upper bulge and the lower bulge;

the bottom of lower shaft sleeve sets up in the lower clutch, be used for promoting joint spare extrusion sheathed tube inner wall.

Furthermore, a plurality of limiting grooves are formed in the peripheral surface of the lower joint, and the clamping pieces are arranged in the limiting grooves;

lower shaft sleeve includes major diameter portion, the top fixed connection of major diameter portion is protruding down, and its bottom sets up in the lower clutch, and fixed connection wedge portion, joint spare one end sets up in the lower clutch, and be provided with the spacing portion of wedge portion adaptation, spacing portion centers on the global setting of joint spare, wedge portion is used for promoting spacing portion orientation the sleeve pipe motion.

Furthermore, the bottom of the wedge-shaped part is fixedly connected with a small-diameter part, the inner diameter of the small-diameter part is matched with the supporting tube, a gap is formed between the clamping piece and the peripheral surface of the supporting tube, and the small-diameter part penetrates through the gap;

the bottom of the small-diameter part is connected with a reset part, the reset part is provided with a second wedge-shaped part matched with the wedge-shaped part, the second wedge-shaped part is positioned below the clamping piece and used for pushing the clamping piece to move towards the supporting tube when the clamping piece ascends, a lower spring is abutted to the lower part of the reset part, the lower spring is sleeved on the supporting tube, and the bottom of the lower spring is abutted to the inner wall of the bottom of the lower connector;

an upper spring is arranged between the inner peripheral surface of the elastic piece and the upper shaft sleeve and sleeved on the supporting pipe.

Further, the inner diameter of the large diameter part is larger than that of the small diameter part, a sliding cavity is formed between the large diameter part and the peripheral surface of the supporting tube, and the bottom of the upper shaft sleeve is slidably arranged in the sliding cavity.

Furthermore, the limiting mechanism comprises a limiting pin, the sliding tube is provided with a radial hole, the limiting pin is arranged in the radial hole, a limiting spring is further arranged in the radial hole, one end, far away from the limiting spring, of the limiting pin is abutted to the supporting tube, a positioning hole matched with the limiting pin is formed in the supporting tube, and the positioning hole is located below the radial hole.

Further, the unsealing mechanism comprises an unsealing pipe, and an unsealing sleeve is arranged at the bottom of the unsealing pipe;

the unsealing sleeve comprises a ring sleeve which is sleeved on the unsealing pipe and is in threaded connection, a mounting hole is formed in the radial direction of the ring sleeve, a reset push rod is arranged in the mounting hole, and one end of the reset push rod extends into the ring sleeve and is of a wedge-shaped structure;

the top of the supporting tube is provided with a clamping groove, the periphery of the top of the ring sleeve is provided with clamping blocks matched with the clamping groove, and the clamping blocks are used for being inserted into the clamping groove to circumferentially limit the ring sleeve and enable the reset push rod to be aligned to the limiting pin when descending.

The invention has the following beneficial effects: when the seat seals the stage, hydraulic oil promotes the slip subassembly and slides down, make elastic component and joint spare all support tight sheathed tube inner wall, it is spacing on the lower clutch by stop gear, when the deblocking stage, demolish the top connection, make it break away from the lower clutch, then with deblocking mechanism from top to bottom insert the intraductal, and connect the lower clutch, meanwhile, make stop gear reset, thereby make elastic component and joint spare reset, then the well is salvaged out to whole packer through deblocking mechanism, and install the top connection, so whole packer can drop into in other wells immediately, in order to realize the purpose of repetitious usage many times.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a partially enlarged schematic view of the upper joint;

FIG. 3 is an enlarged view of a portion of the slide assembly;

FIG. 4 is a schematic view of the clip member when anchored and locked;

FIG. 5 is an enlarged partial view of the slide assembly of FIG. 4;

FIG. 6 is a schematic view of the resilient member deforming the sealing sleeve;

FIG. 7 is an enlarged partial view of the slide assembly of FIG. 6;

FIG. 8 is a schematic view of the upper joint as disengaged;

FIG. 9 is a schematic view of the release tube inserted into the cannula;

FIG. 10 is a schematic illustration of the unsealing;

FIG. 11 is an enlarged view taken at A in FIG. 9;

FIG. 12 is a schematic view along line B-B of FIG. 10.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 12 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

A packer comprises an upper joint 4 and a lower joint 5 which are oppositely provided with openings and detachably connected, wherein one ends of the upper joint 4 and the lower joint 5 which are opposite are respectively connected with an upper oil pipe 2 and a lower oil pipe 3, a sliding assembly is slidably arranged in the lower joint 5, a flow dividing mechanism communicated with the upper oil pipe 2 is arranged in the upper joint 4, a hydraulic cavity is formed between the flow dividing mechanism and the upper joint 4, and the top of the sliding assembly is positioned in the hydraulic cavity;

the shunting mechanism is used for guiding liquid to flow to the hydraulic cavity so as to push the sliding assembly to slide downwards and enable the sliding assembly to push the elastic piece 8 and the clamping piece 10 to extrude the inner wall of the sleeve 1, the clamping piece 10 is arranged on the peripheral surface of the lower joint 5, and the elastic piece 8 is arranged on the sliding assembly and is positioned between the lower joint 5 and the upper joint 4;

the sliding assembly is connected with the lower joint 5 through a limiting mechanism, and when the sliding assembly slides downwards to the lowest height, the sliding assembly is limited;

still include deblocking mechanism, deblocking mechanism is used for dismantling the connection lower clutch 5, and makes stop gear resets.

As shown in fig. 1, a casing 1 is a prior art and is arranged in a borehole, the present invention is used for plugging a gap between the casing 1 and a packer, an upper joint 4 is located above a lower joint 5, the outer diameters of the peripheral surfaces of the upper joint 4 and the lower joint 5 are the same and are arranged with the gap between the casing 1, in fig. 1, the packer is lowered into the casing 1 and reaches a predetermined position, the bottom of a lower oil pipe 3 is supported at the bottom of the borehole or on other packers in the borehole, an elastic element 8 and a clamping element 10 are located at an initial state, and the two are distributed with the casing 1 at equal gaps.

The one end accessible flange that top connection 4 carried on the back mutually with lower clutch 5, screw thread etc. can be dismantled respectively and connect upper and lower oil pipe to communicate upper and lower oil pipe respectively, go up the top of oil pipe 2 and extend the well, and be used for connecting water injection equipment, hydraulic pump respectively, before the seat, go up oil pipe 2 and connect water injection equipment, be used for just, backwashing well, the seat seals the in-process, goes up oil pipe 2 and connects the hydraulic pump, is used for injecting into liquid, hydraulic oil to going up in oil pipe 2 promptly.

The specific implementation process of the present invention is illustrated by the workflow of different stages as follows:

in the setting stage: the hydraulic pump pours into hydraulic oil into the oil pipe 2, through reposition of redundant personnel mechanism thereupon, pours into hydraulic pressure into in the chamber, then promotes the slip subassembly and slides down to with elastic component 8 compression deformation, promote joint spare 10, make elastic component 8 and joint spare 10 all support the inner wall of tight sleeve pipe 1, and when the slip subassembly was located minimum stroke, by stop gear spacing on lower clutch 5, then finally realize the seat and seal the purpose, form like the seat seal state in fig. 8, 9.

During the deblocking stage, giving up 4 the release earlier, be about to the top connection 4 and demolish, make it break away from lower clutch 5, form as the state in figure 10, then with deblocking mechanism from top to bottom insert the sleeve pipe 1 in to connect lower clutch 5, make stop gear reset simultaneously with this to make elastic component 8 and joint spare 10 reset, then it can with whole packer salvage well through deblocking mechanism again.

After the ground is fished out again, the deblocking mechanism is removed, the upper joint 4 is installed, and the whole packer can be immediately put into other boreholes because the limiting mechanism is reset at the moment, so that the purpose of repeated use for many times is achieved.

Further, the flow dividing mechanism comprises an inserting pipe 13, the inserting pipe 13 is communicated with the upper oil pipe 2, the top of the inserting pipe 13 is fixedly connected with the upper joint 4 through a plurality of fixing rods 14, the bottom of the inserting pipe is detachably arranged in a supporting pipe 12 and seals the supporting pipe 12, and the plurality of fixing rods 14 are arranged at intervals and are positioned above the supporting pipe 12;

the bottom of the supporting tube 12 is fixedly connected with the lower joint 5, the top of the supporting tube 12 is positioned in the upper joint 4, the hydraulic cavity is formed between the peripheral surface of the supporting tube 12 and the inner wall of the upper joint 4, and the sliding assembly is sleeved on the supporting tube 12.

As shown in figure 1, the upper joint and the lower joint are both of a hollow structure, and are internally provided with stepped cavities, the stepped cavities of the upper joint and the lower joint are symmetrically arranged, the inner diameters of the two stepped cavities are smaller, the inner diameters of the two ends which are back to back are respectively connected with an upper oil pipe and a lower oil pipe, and the inner diameter of the opposite end is larger.

The top of the fixing rod 14 is fixedly connected with the inner wall surface of the upper joint 4, the fixing rods 14 are uniformly distributed around the axis of the inserting pipe 13, the inserting pipe 13 is communicated with the upper oil pipe 2, an upper annular cavity is formed between the outer circumferential surface of the inserting pipe 13 and the inner circumferential surface of the upper joint 4, the top of the supporting pipe 12 is sleeved on the inserting pipe 13 and is located in the upper annular cavity, a hydraulic cavity is formed between the outer circumferential surface of the supporting pipe 12 and the inner circumferential surface of the upper joint 4, and the hydraulic cavity is annular and is arranged around the supporting pipe 12.

The detachable connection between the support tube 12 and the plug tube 13 forms a detachable connection between the upper and lower joints.

During the concrete implementation, hydraulic oil from last oil pipe 2 interior downward motion, because stay tube 12 is sealed by grafting pipe 13, so hydraulic oil flows into the hydraulic chamber from the interval between a plurality of dead levers 14 to be located the slip subassembly top, then promote the slip subassembly and move down, so realized the reposition of redundant personnel effect, make hydraulic oil in the seat seal stage, can correctly promote the slip subassembly and move down.

Further, the insertion pipe 13 is connected with the support pipe 12 through threads;

still include ball sealer 11, the inner wall of grafting pipe 13 bottom be with the cambered surface structure of ball sealer 11 adaptation, and be provided with the intercommunication the through-hole of stay tube 12, ball sealer 11 is used for following put into in the oil pipe 2, and plug up the through-hole.

Specifically, the insertion pipe 13 can be separated from the support pipe 12 by rotating the oil feeding pipe 2, so that the upper joint and the lower joint are separated in the unsealing stage.

The sealing ball 11 is preferably a steel ball, when the seat sealing stage begins, the sealing ball 11 is firstly placed into the oil feeding pipe 2, the sealing ball 11 falls at the bottom of the insertion pipe 13, as shown in fig. 2, the sealing ball 11 is attached to the bottom of the insertion pipe 13 to form a sealing structure, so that when hydraulic oil is injected, a through hole at the bottom of the support pipe 12 can be blocked, and hydraulic oil can only pass through the space between the fixing rods 14.

In fig. 1, the sealing ball 11 is not inserted into the plugging pipe 13, and at this time, it is in an initial state, and it is possible to perform the forward and reverse well-flushing operations, and in fig. 8, after the setting is completed and the upper joint 4 is removed, it is possible to connect other pipes to the support pipe 12 by screw threads, so that it is possible to perform the pumping operation, and when the upper joint 4 is removed and other pipes are installed, the structure of the clamping member 10 pressing the casing 1 realizes the restraint of the whole packer, and it is prevented from rotating.

Further, the sliding assembly comprises a sliding pipe 6 sleeved on the supporting pipe 12, the sliding pipe 6 is arranged in the hydraulic cavity, the bottom of the sliding pipe 6 extends out of the upper joint 4, and the bottom of the sliding pipe 6 is connected with an extrusion mechanism for pushing the elastic part 8 and the clamping part 10 to extrude the inner wall of the sleeve 1.

Specifically, the inner peripheral surface of the sliding tube 6 is attached to the support tube 12, the outer peripheral surface is attached to the upper joint 4, and the upper end surface and the inner and outer peripheral surfaces of the sliding tube 6 can be provided with sealing rings to improve sealing capacity and can be pushed by hydraulic oil.

Further, the extrusion mechanism comprises an upper shaft sleeve 7 and a lower shaft sleeve 9, the sliding tube 6, the upper shaft sleeve 7 and the lower shaft sleeve 9 are sleeved on the support tube 12 from top to bottom, the bottom of the sliding tube 6 is fixedly connected with the top of the upper shaft sleeve 7, and the bottom of the upper shaft sleeve 7 is slidably connected with the lower shaft sleeve 9;

the top peripheral surface of the upper shaft sleeve 7 is provided with an upper protrusion 701, the top peripheral surface of the lower shaft sleeve 9 is provided with a lower protrusion 901, and the elastic piece 8 is of an annular structure, is sleeved on the upper shaft sleeve 7 and is positioned between the upper protrusion and the lower protrusion;

the bottom of the lower shaft sleeve 9 is arranged in the lower joint 5 and used for pushing the clamping piece 10 to extrude the inner wall of the sleeve 1.

As fig. 3, the upper protrusion 701 and the lower protrusion 901 clamp the elastic part 8, the two opposite sides are provided with the extending parts, the groove body with the cross section shaped like a Chinese character 'tu' is formed together, the elastic part 8 is clamped therein to form a limiting effect, and the elastic part 8 can be prevented from falling off.

Specifically, in the stage of seat sealing, hydraulic oil pushes the sliding tube 6 to move downwards, the upper shaft sleeve 7 and the lower shaft sleeve 9 integrally move downwards, under the supporting effect of the elastic piece 8, micro-movement occurs between the upper shaft sleeve 7 and the lower shaft sleeve 9, the lower shaft sleeve 9 moves downwards and simultaneously pushes the clamping piece 10 to move, when the lower shaft sleeve 9 is located at the lowest stroke, the state shown in fig. 4 and 5 is formed, then the upper shaft sleeve 7 moves downwards, the elastic piece 8 is extruded to deform, the sleeve 1 is extruded, a sealing structure is formed between the sleeve 1 and the clamping piece, the state shown in fig. 6 and 7 is formed, and seat sealing is completed.

Furthermore, a plurality of limiting grooves are formed in the peripheral surface of the lower joint 5, and the clamping pieces 10 are arranged in the limiting grooves;

lower shaft sleeve 9 includes major diameter portion 902, the top fixed connection of major diameter portion 902 is protruding 901 down, and its bottom sets up in the lower clutch 5, and fixed connection wedge portion 903, joint 10 one end sets up in the lower clutch 5, and be provided with spacing portion 100 of wedge portion 903 adaptation, spacing portion 100 centers on the global setting of joint 10, wedge portion 903 is used for promoting spacing portion 100 orientation the sleeve pipe 1 motion.

As shown in fig. 3, the upper and lower joints are spaced apart from each other, and an elastic member 8 is disposed between the upper and lower joints, that is, a portion of the upper sleeve 7 and a portion of the lower sleeve 9 are disposed in the space between the upper and lower joints.

The lower shaft sleeve 9 sequentially comprises a lower protrusion 901, a large-diameter part 902, a wedge part 903, a small-diameter part 905 and a resetting part 904 from top to bottom, when the packer is in an initial state, namely in fig. 3, the wedge part 903 is located above the clamping piece 10, the inclined surface of the wedge part 903 faces the clamping piece 10, and when the lower shaft sleeve 9 moves downwards, the wedge part 903 extrudes and pushes the clamping piece 10 to move towards the sleeve 1.

Further, the bottom of the wedge 903 is fixedly connected with a small diameter part 905, the inner diameter of the small diameter part 905 is adapted to the support tube 12, a gap is formed between the clamping piece 10 and the circumferential surface of the support tube 12, and the small diameter part 905 penetrates through the gap;

the bottom of the small-diameter part 905 is connected with a reset part 904, the reset part 904 is provided with a second wedge-shaped part matched with the wedge-shaped part 903, the second wedge-shaped part is located below the clamping piece 10 and used for pushing the clamping piece 10 to move towards the support tube 12 when ascending, a lower spring 19 is abutted to the lower part of the reset part 904, the lower spring 19 is sleeved on the support tube 12, and the bottom of the lower spring is abutted to the inner wall of the bottom of the lower joint 5;

an upper spring 18 is arranged between the inner peripheral surface of the elastic member 8 and the upper shaft sleeve 7, and the upper spring 18 is sleeved on the support pipe 12.

Reset portion 904 sets up on the outer peripheral face of path portion 905, with the inner wall laminating of lower clutch 5, second wedge portion is located the top of the portion 904 that resets, spacing portion 100 both sides on joint spare 10 are the inclined plane, respectively with wedge portion 903, second wedge portion adaptation, and have limiting displacement, can avoid joint spare 10 to break away from the spacing groove, work as spacing portion 100 butt lower clutch 5 inner wall, form a gap, second wedge portion promotes joint spare 10 from this gap promptly and keeps away from sleeve pipe 1.

The plurality of clamping pieces 10 are arranged around the circumference of the small diameter portion 905, after the seat sealing is completed, the reset portion 904 downwards extrudes the lower spring 19, the upper shaft sleeve 7 extrudes the upper spring 18, the upper spring 18 and the lower spring 19 are both compressed, in the deblocking stage, when the limiting mechanism resets, the upper spring 18 and the lower spring 19 rebound at the same time, the upper shaft sleeve and the lower shaft sleeve move upwards to reset and return to the initial state in the figure 1, in the upward movement process of the lower shaft sleeve 7, the second wedge-shaped portion on the reset portion 904 pushes the clamping pieces 10 to reset, and the elastic pieces 8 recover deformation under the action of self elasticity, so that in the deblocking stage, the resetting of the elastic pieces 8 and the clamping pieces 10 and the overall upward resetting of the sliding assembly can be realized, and then the upper connector 1 is installed, and the clamping pieces can be put into use again.

In addition, as shown in fig. 3, the lower protrusion 901, the large diameter portion 902, the wedge 903 and the small diameter portion 905 may be integrally molded or fixedly connected, the reset portion 904 and the small diameter portion 905 are detachably connected, and may be connected by a screw thread, etc., the top end surface of the lower joint 5 is connected with the fixing ring 501 through a screw thread, the inner diameter of the fixing ring 501 is smaller than that of the lower joint 5, the top outer diameter of the wedge 903 is matched with the lower joint 5, so as to limit the wedge 903, restrict the maximum upward movement stroke of the lower shaft sleeve 7, and the fixing ring 501 is located under the lower protrusion 901, so as to restrict the maximum downward movement stroke of the lower shaft sleeve 7.

Like 1, lower clutch 5 includes connecting portion and pipe portion, and pipe portion is hollow cylinder structure, and the connection portion can be dismantled to its bottom, can be for mode such as screw, screw connection, and the bottom of connecting portion is connected at the top of oil pipe 3 down, the top fixed connection stay tube 12 bottom of connecting portion.

The problem of mounting the snap-in member 10 and the lower hub 7 is then solved by the detachable connection of the lower joint 5, the fixing ring 501, the connecting portion, and the reset portion 904.

Further, the inner diameter of the large diameter portion 902 is larger than the inner diameter of the small diameter portion 905, a sliding cavity 702 is formed between the large diameter portion and the peripheral surface of the support tube 12, and the bottom of the upper sleeve 7 is slidably disposed in the sliding cavity 702.

As shown in fig. 3, the maximum downward stroke of the upper sleeve 7 is restricted by the sliding cavity 702, and the maximum upward stroke of the upper sleeve 7 is restricted by the upper joint 4, i.e., the bottom end face of the upper joint 4 is located right above the upper protrusion 701.

Further, the limiting mechanism comprises a limiting pin 15, the sliding tube 6 is provided with a radial hole, the limiting pin 15 is arranged in the radial hole, a limiting spring 16 is further arranged in the radial hole, one end, far away from the limiting spring 16, of the limiting pin 15 is abutted to the supporting tube 12, a positioning hole 17 matched with the limiting pin 15 is formed in the supporting tube 12, and the positioning hole 17 is located below the radial hole.

As shown in fig. 2, one end of the limit pin 15 is fixedly connected to a limit spring 16, the other end of the limit spring 16 is fixedly connected to the inner wall of a radial hole, the radial hole has a blind hole structure, the opening faces the support tube 12, and a plurality of limit pins 15 are arranged in the circumferential direction of the sliding tube 6.

In the seat sealing stage, the limit pin 15 moves downwards, and when the limit pin is aligned and concentric with the positioning hole 17, the limit spring 16 pushes the limit pin 15 to enter the positioning hole 17, so that the function of locking the sliding tube 6 is realized.

In the specific implementation of the positioning of the limit pin 15, a protrusion or a sliding groove may be provided on the inner circumferential surface of the sliding tube 6, and a corresponding sliding groove or protrusion may be provided on the support tube 12, so as to restrict the sliding tube 6 from rotating circumferentially and achieve the positioning function between the limit pin 15 and the positioning hole 17.

Further, the unsealing mechanism comprises an unsealing pipe 20, and an unsealing sleeve 21 is arranged at the bottom of the unsealing pipe 20;

the unsealing sleeve 21 comprises a ring sleeve 210 which is sleeved on the unsealing pipe 20 and is in threaded connection, a mounting hole is formed in the radial direction of the ring sleeve 210, a reset push rod 212 is arranged in the mounting hole, and one end of the reset push rod 212 extends into the ring sleeve 210 and is of a wedge-shaped structure;

a clamping groove is formed in the top of the support tube 12, a clamping block 211 matched with the clamping groove is arranged on the peripheral surface of the top of the ring sleeve 210, and the clamping block 211 is used for being inserted into the clamping groove to circumferentially limit the ring sleeve 210 and enable the reset push rod 212 to be aligned with the limit pin 15 when descending.

As shown in fig. 9 and 10, the deblocking pipe 20 moves downward and is concentric with the support pipe 12, when the clamping block 211 is clamped into the clamping groove, the deblocking pipe 20 starts to rotate, the deblocking pipe 20 moves downward along with the deblocking pipe and pushes the reset push rod 212 to move toward the limit pin 15, so that the limit pin 15 is pushed out of the positioning hole 17, the end of the reset push rod 212 is flush with the opening of the positioning hole 17, the upper spring 18 and the lower spring 19 rebound, the sliding assembly resets, and the reset push rod 212 plays a supporting role at the moment, the whole packer can be taken out by pushing the deblocking pipe 20 upward, and the reset push rod 212 can be effectively aligned with the limit pin 15 due to the linear motion of the deblocking pipe 20, so that the packer is suitable for a vertical section in a borehole.

Specifically, in order to avoid the circumferential rotation of the reset push rod 212, a groove may be formed in the side surface of the reset push rod, a convex portion may be formed in the inner wall of the mounting hole, and the convex portion is clamped in the groove so as to constrain the circumferential rotation of the reset push rod 212, and the bottom of the unsealing pipe 20 is of a tapered structure and is adapted to the wedge structure of the reset push rod 212, so that the reset push rod 212 is pushed to move.

After the unsealing tube 20 is removed, the push reset push rod 212 is reset, and the reset push rod 212 and the mounting hole can be in interference fit to prevent the reset push rod 212 from falling off.

In addition, the terminal surface of spacer pin 15 is spherical structure, and it breaks away from locating hole 17 to be convenient for, and the top fixed connection joint ring 22 of stay tube 12, joint ring 22 top sets up a plurality of draw-in grooves at its circumference, and what fixture block 211 corresponded sets up a plurality ofly, during concrete implementation, can also set up corresponding detection switch, sensor etc. on buckle 211 for detect the condition in place of fixture block 211.

The above-described embodiments are only intended to describe the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications, variations, modifications, and substitutions which may be made by those skilled in the art to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.

Claims

1. A packer, its characterized in that: the oil pipe joint comprises an upper joint (4) and a lower joint (5) which are oppositely arranged in opening and detachably connected, wherein one ends of the upper joint and the lower joint, which are opposite to each other, are respectively connected with an upper oil pipe (2) and a lower oil pipe (3), a sliding assembly is slidably arranged in the lower joint (5), a flow dividing mechanism communicated with the upper oil pipe (2) is arranged in the upper joint (4), a hydraulic cavity is formed between the flow dividing mechanism and the upper joint (4), and the top of the sliding assembly is positioned in the hydraulic cavity;

the shunting mechanism is used for guiding liquid to flow to the hydraulic cavity so as to push the sliding assembly to slide downwards and enable the sliding assembly to push the elastic piece (8) and the clamping piece (10) to extrude the inner wall of the sleeve (1), the clamping piece (10) is arranged on the peripheral surface of the lower joint (5), and the elastic piece (8) is arranged on the sliding assembly and is positioned between the lower joint (5) and the upper joint (4);

the sliding assembly is connected with the lower joint (5) through a limiting mechanism, and when the sliding assembly slides downwards to the lowest height, the sliding assembly is limited;

still include deblocking mechanism, deblocking mechanism is used for dismantling the connection lower clutch (5), and makes stop gear resets.

2. A packer as claimed in claim 1, wherein: the flow dividing mechanism comprises an inserting pipe (13), the inserting pipe (13) is communicated with the oil feeding pipe (2), the top of the inserting pipe is fixedly connected with the upper joint (4) through a plurality of fixing rods (14), the bottom of the inserting pipe is detachably arranged in the supporting pipe (12) and seals the supporting pipe (12), and the fixing rods (14) are arranged at intervals and are positioned above the supporting pipe (12);

the bottom of the supporting tube (12) is fixedly connected with the lower joint (5), the top of the supporting tube (12) is positioned in the upper joint (4), the hydraulic cavity is formed between the peripheral surface of the supporting tube (12) and the inner wall of the upper joint (4), and the sliding assembly is sleeved on the supporting tube (12).

3. A packer as claimed in claim 2, wherein: the insertion pipe (13) is connected with the support pipe (12) through threads;

still include ball sealer (11), peg graft pipe (13) bottom inner wall be with ball sealer (11) adaptation's cambered surface structure, and be provided with the intercommunication the through-hole of stay tube (12), ball sealer (11) are used for following put into in oil pipe (2), and plug up the through-hole.

4. A packer as claimed in claim 2, wherein: the sliding assembly comprises a sliding pipe (6) sleeved on the supporting pipe (12), the sliding pipe (6) is arranged in the hydraulic cavity, the bottom of the sliding pipe extends out of the upper joint (4), and the bottom of the sliding pipe (6) is connected with an extrusion mechanism to push the elastic piece (8) and the clamping piece (10) to extrude the inner wall of the sleeve (1).

5. A packer as claimed in claim 4, wherein: the extrusion mechanism comprises an upper shaft sleeve (7) and a lower shaft sleeve (9), the sliding tube (6), the upper shaft sleeve (7) and the lower shaft sleeve (9) are sleeved on the support tube (12) from top to bottom, the bottom of the sliding tube (6) is fixedly connected with the top of the upper shaft sleeve (7), and the bottom of the upper shaft sleeve (7) is slidably connected with the lower shaft sleeve (9);

the top peripheral surface of the upper shaft sleeve (7) is provided with an upper bulge (701), the top peripheral surface of the lower shaft sleeve (9) is provided with a lower bulge (901), and the elastic piece (8) is of an annular structure, is sleeved on the upper shaft sleeve (7), and is positioned between the upper bulge and the lower bulge;

the bottom of the lower shaft sleeve (9) is arranged in the lower joint (5) and used for pushing the clamping piece (10) to extrude the inner wall of the sleeve (1).

6. A packer as claimed in claim 5, wherein: the peripheral surface of the lower joint (5) is provided with a plurality of limiting grooves, and the clamping pieces (10) are arranged in the limiting grooves;

lower shaft sleeve (9) are including major diameter portion (902), protruding (901) under the top fixed connection of major diameter portion (902), its bottom sets up in lower clutch (5), and fixed connection wedge portion (903), joint spare (10) one end sets up in lower clutch (5), and be provided with spacing portion (100) of wedge portion (903) adaptation, spacing portion (100) center on the global setting of joint spare (10), wedge portion (903) are used for promoting spacing portion (100) orientation sleeve pipe (1) motion.

7. A packer as claimed in claim 6, wherein: the bottom of the wedge-shaped part (903) is fixedly connected with a small-diameter part (905), the inner diameter of the small-diameter part (905) is matched with the supporting tube (12), a gap is formed between the clamping piece (10) and the circumferential surface of the supporting tube (12), and the small-diameter part (905) penetrates through the gap;

the bottom of the small-diameter part (905) is connected with a resetting part (904), the resetting part (904) is provided with a second wedge-shaped part matched with the wedge-shaped part (903), the second wedge-shaped part is located below the clamping piece (10) and used for pushing the clamping piece (10) to move towards the supporting tube (12) when ascending, a lower spring (19) is abutted to the lower part of the resetting part (904), the lower spring (19) is sleeved on the supporting tube (12), and the bottom of the resetting part is abutted to the inner wall of the bottom of the lower connector (5);

an upper spring (18) is arranged between the inner peripheral surface of the elastic piece (8) and the upper shaft sleeve (7), and the upper spring (18) is sleeved on the supporting pipe (12).

8. A packer as claimed in claim 6, wherein: the inner diameter of the large-diameter part (902) is larger than that of the small-diameter part (905), a sliding cavity (702) is formed between the inner diameter of the large-diameter part and the peripheral surface of the supporting pipe (12), and the bottom of the upper shaft sleeve (7) is arranged in the sliding cavity (702) in a slidable mode.

9. A packer as claimed in claim 4, wherein: stop gear includes spacer pin (15), slip pipe (6) are provided with radial hole, spacer pin (15) set up radial downthehole, radial downthehole spacing spring (16) of still being provided with, spacer pin (15) are kept away from the one end butt stay tube (12) of spacing spring (16), be provided with on stay tube (12) with locating hole (17) of spacer pin (15) adaptation, locating hole (17) are located radial hole's below.

10. A packer as claimed in claim 10, wherein: the unsealing mechanism comprises an unsealing pipe (20), and an unsealing sleeve (21) is arranged at the bottom of the unsealing pipe (20);

the unsealing sleeve (21) comprises a ring sleeve (210) which is sleeved on the unsealing pipe (20) and is in threaded connection, a mounting hole is formed in the radial direction of the ring sleeve (210), a reset push rod (212) is arranged in the mounting hole, and one end of the reset push rod (212) extends into the ring sleeve (210) and is of a wedge-shaped structure;

the top of the supporting tube (12) is provided with a clamping groove, the peripheral surface of the top of the ring sleeve (210) is provided with a clamping block (211) matched with the clamping groove, and the clamping block (211) is used for being inserted into the clamping groove to circumferentially limit the ring sleeve (210) and enable the reset push rod (212) to be aligned to the limiting pin (15) when descending.