CN114658386B

CN114658386B - Expansion type packer and using method thereof

Info

Publication number: CN114658386B
Application number: CN202210565876.5A
Authority: CN
Inventors: 孙浩峰
Original assignee: Weida Petroleum Equipment Co ltd
Current assignee: Shaanxi Shijiuchang Environmental Protection Engineering Co.,Ltd.
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-08-05
Anticipated expiration: 2042-05-24
Also published as: CN114658386A

Abstract

The invention relates to the technical field of petroleum equipment, in particular to an expansion packer and a using method thereof. The expanding packer provided by the invention has the advantages of good sealing stability, convenience in rubber cylinder assembly and disassembly and strong pressure difference bearing capacity during sealing.

Description

Expansion type packer and using method thereof

Technical Field

The invention relates to the technical field of petroleum equipment, in particular to an expansion packer and a using method thereof.

Background

The packer is an elastic sealing tool and is used for sealing annular spaces between pipe columns with various sizes and well bores and between the pipe columns, isolating production zones and protecting the pipe columns. The packer can be divided into a compression packer and an expansion packer according to different expansion modes of the rubber sleeve. Wherein, the expanding packer mainly includes: the upper joint, the expandable rubber sleeve and the lower joint are sequentially sleeved outside the central pipe, a liquid inlet hole is formed in the sleeving surface of the central pipe and the expandable rubber sleeve, liquid enters a gap between the central pipe and the rubber sleeve through a seat sealing channel on the central pipe of the expandable packer, the rubber sleeve with elasticity is expanded, the diameter is increased until the outer diameter of the rubber sleeve is tightly attached to the inner wall of the sleeve, and the annular space between the inner diameter of the sleeve and the outer diameter of the packer is separated by the rubber sleeve to complete seat sealing. After the expanded packer completes the intended packing cycle, the packer needs to be unset and then lifted out of the well. When the packer is used for deblocking, the pressure in the central pipe is discharged, the rubber sleeve of the expandable packer rebounds under the elastic action of the rubber sleeve, liquid between the rubber sleeve and the central pipe is discharged back to the inner cavity of the central pipe, and the diameter of the rubber sleeve is restored to the state before setting, so that deblocking is completed.

The expandable packer in the prior art has the following problems:

1. the common rubber sleeve of the expandable packer and the central pipe are vulcanized into a whole, liquid enters a gap between the central pipe and the rubber sleeve through a liquid passing hole in the side wall of the central pipe to expand the rubber sleeve with elasticity, and the conditions of tearing and slotting of the rubber sleeve, separation of a vulcanized part and the like are frequently generated in the actual use process, so that sealing failure is caused;

2. because the depth of the oil-gas layer is deeper and deeper, the pressure difference formed between the upper part and the lower part of the expansion packer is larger and larger, the capacity of the existing packer for bearing the pressure difference is limited, the expansion rubber sleeve can be excessively deformed or wriggled, the packer is easy to lose the sealing phenomenon, and the economic loss is caused.

Disclosure of Invention

In order to solve at least one of the technical problems, the invention provides an expansion packer, which comprises a central tube, wherein two ends of the central tube are respectively in threaded connection with a connector, the connectors and the central tube form an annular space, a sealing ring tightly attached to the outer side wall of the central tube is fixedly arranged in the annular space, the outer side wall of the sealing ring is connected with two free ends of a rubber cylinder, the rubber cylinder is in a folded ring shape and forms a sealed liquid storage cavity together with the sealing ring, the rubber cylinder axially extends out of the annular space, one end far away from the connectors forms a bent part, a first through hole is formed in the central tube, and a second through hole communicated with the first through hole and the liquid storage cavity is formed in the sealing ring.

Preferably, the two ends of the central tube are respectively provided with a step part which is recessed inwards in the radial direction, the sealing rings are sleeved on the step parts, the outer diameter of the sealing rings is consistent with the maximum outer diameter of the central tube, the annular space respectively comprises a sealing ring space and a rubber sleeve space from inside to outside, the sealing ring space is consistent with the sealing ring size, in an initial state, the part of the rubber sleeve, which is located in the annular space, is filled with the rubber sleeve space, the part of the rubber sleeve, which extends out of the annular space, is tightly attached to the central tube, and the two bending parts of the rubber sleeves are mutually abutted.

Preferably, two annular grooves are formed in the outer side wall of the sealing ring, the two annular grooves are located on the upper side and the lower side of the second through hole, and an embedded groove is formed in one end, away from the second through hole, of each annular groove; the free end of the rubber cylinder is provided with an annular flange, the free end of the rubber cylinder is embedded into the annular groove in a sealing mode, and the annular flange is embedded into the embedded groove in a sealing mode.

Preferably, the axial both sides of second through-hole are equipped with the third through-hole respectively, the cross-section of embedded groove is spherical, and spherical cross-section's entry length is less than its maximum diameter, annular flange have with the corresponding spherical cross-section of embedded groove, be equipped with the toroidal cavity in the annular flange, be equipped with respectively the intercommunication on the free end the fourth through-hole of third through-hole and toroidal cavity.

Preferably, a plurality of bracing pieces are articulated to connector circumference equidistance, and articulated department is equipped with the torsional spring, torsional spring one end is connected the connector, the other end is connected the bracing piece, the bracing piece is hugged closely the packing element extends annular space's part, and can follow the inflation of packing element, by the vertical state radial rotation to butt sleeve pipe inner wall's horizontality.

Preferably, the connector is close to kink one end is equipped with limit flange, limit flange below circumference equidistance is equipped with a plurality of rectangular blocks, distance between two adjacent rectangular blocks with the width of bracing piece is unanimous, the circumference both sides of rectangular block are equipped with the mounting groove respectively, and in the mounting groove of two adjacent rectangular blocks was fixed in to the articulated shaft level, on the articulated shaft in the mounting groove was located to the torsional spring cover, the one end of bracing piece with articulated shaft pivot connection.

Preferably, a sliding groove is formed in the free end of the supporting rod, the sliding groove extends along the length direction of the supporting rod, a sliding rod is arranged in the sliding groove, one end of a first spring is fixed to the bottom of the sliding groove, the other end of the first spring is fixedly connected with the sliding rod, the supporting rod is located in a vertical state in an initial state, the first spring extends naturally, and the sliding rod extends out of the sliding groove to a bending portion of the rubber sleeve.

Preferably, the free end of the sliding rod is connected with a curved roller, the axis of the curved roller is parallel to the axis of the hinge shaft, the diameter of the curved roller is consistent with the thickness of the support rod, a second spring is arranged between every two adjacent curved rollers, one side of the curved roller, facing the support rod, is provided with an insertion groove for the support rod to be inserted into, when the support rod is in a horizontal state, the sliding rod is accommodated in the sliding groove, and the curved roller and the support rod are inserted into a whole.

Preferably, two lateral wall symmetries of bracing piece are equipped with the hinge ear, the hinge ear articulates the connecting rod, the thickness of connecting rod with the thickness of bracing piece is unanimous, and the free end of two adjacent connecting rods is articulated, the hinge ear is followed the length direction of bracing piece is equipped with a plurality ofly, and high resilience rubber membrane is fixed in a plurality ofly the bracing piece towards packing element one side, with a plurality of the bracing piece forms umbrella structure jointly.

The invention provides a using method of an expansion packer, which comprises the following steps:

step S100, assembling: connecting an upper connector and a lower connector of the expansion packer with an upstream pipe string and a downstream pipe string respectively, and then setting the connectors at specified positions in a sleeve;

step S200, setting: pumping pressure liquid into the central tube, wherein the liquid sequentially enters a liquid storage cavity of the rubber cylinder through a first through hole of the central tube and a second through hole of the sealing ring, the part of the rubber cylinder, which is positioned in the annular space, is limited by the connector and cannot expand, the part of the rubber cylinder, which extends out of the annular space, simultaneously expands axially and radially until the seat sealing is completed, and after the seat sealing is completed, the two rubber cylinders are axially sealed and abutted to radially seal an annular space between the central tube and the sleeve;

step S300, unsealing: pressure liquid in the central tube is removed, liquid in the liquid storage cavity of the rubber cylinder flows out through the second through hole and the first through hole in sequence, the rubber cylinder shrinks, and deblocking is completed.

Compared with the prior art, the invention has the following beneficial technical effects:

1. the folding rubber cylinder and the sealing ring are connected in a matched manner, the rubber cylinder and the central pipe are connected in a sealing manner, the assembly and disassembly are convenient, the rubber cylinder can be efficiently and stably sealed without being vulcanized with the central pipe into a whole, and in the expansion process of the rubber cylinder, the annular space formed by the central pipe and the connector can effectively inhibit the deformation of the joint of the rubber cylinder and the sealing ring, so that the expansion only occurs in the part of the rubber cylinder extending out of the annular space, the use stability of the rubber cylinder is improved, and the problems that the sealing performance is influenced by tearing, slotting, separation of the vulcanized part and the like of the rubber cylinder are avoided;

2. the two connectors at the upper end and the lower end of the central tube are arranged in a mirror image mode, the structures such as the sealing rings and the rubber cylinders at the upper end and the lower end are arranged in a mirror image mode, the central tube is provided with a step part, the sealing rings are sleeved on the step part, and then the sealing rings are directly pressed and fixed on the central tube through the connectors, so that the central tube is more convenient to assemble and disassemble;

3. the annular flange at the free end of the rubber cylinder is embedded in the embedding groove of the sealing ring, and the annular cavity is arranged inside the annular flange, so that the annular flange has an expansion self-sealing effect, and the sealing property and the stability of the connection of the rubber cylinder and the sealing ring are further improved;

4. the annular supporting structure formed by the supporting rods is additionally arranged, so that the pressure difference bearing capacity of the expansion packer can be improved, the liquid drainage efficiency of the rubber sleeve during deblocking can be promoted, and rapid deblocking is realized;

in conclusion, the expandable packer provided by the invention has the advantages of good sealing stability, convenience in rubber cylinder assembly and disassembly and strong pressure difference bearing capacity during sealing.

Drawings

FIG. 1 is a schematic plan view of the initial state of the present invention;

FIG. 2 is a schematic view showing a connection state between the connection head and the center tube;

FIG. 3 is a schematic view of the seal ring and the rubber cartridge in an exploded state;

FIG. 4 is a schematic view showing a connection state of the connection head and the support rod;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is an enlarged view of A and B of FIG. 5;

FIG. 7 is a right side view of the support pole;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

FIG. 9 is a schematic perspective view of the initial state of the present invention;

FIG. 10 is a perspective view of the seated position of the present invention;

FIG. 11 is a schematic plan view of the seated position of the present invention;

fig. 12 is a top view of the seated state of the present invention.

Description of reference numerals:

1. the central tube, 11, the first through hole, 12, the step part, 2, the connector, 21, the limit flange, 22, the rectangular block, 221, the mounting groove, 23, the hinge shaft, 24, the torsion spring, 25, the annular space, 251, the sealing ring space, 252, the rubber tube space, 3, the sealing ring, 31, the second through hole, 311, the third through hole, 312, the sealing ring groove, 32, the annular groove, 33, the embedded groove, 4, the rubber tube, 41, the free end, 411, the annular flange, 412, the annular cavity, 413, the fourth through hole, 42, the bending part, 43, the liquid storage cavity, 5, the support rod, 51, the sliding groove, 52, the sliding rod, 53, the first spring, 54, the curved roller, 541, the inserting groove, 542, the second spring, 55, the ear, 56 and the connecting rod are hinged.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Example 1

Combine fig. 1 to fig. 3, this embodiment provides an expanding packer, including

center tube

1, 1 both ends of center tube threaded connection connector 2 respectively, connector 2 with center tube 1 forms annular space 25, annular space 25 internal fixation be equipped with the sealing ring 3 of the sealed laminating of 1 lateral wall of center tube, two free ends 41 of packing element 4 are connected to the lateral wall of sealing ring 3, packing element 4 is folding annular, and with sealing ring 3 forms sealed stock solution chamber 43 jointly, 4 axial extensions of packing element 25 keeps away from one end of connector 2 forms a kink 42, be equipped with first through-hole 11 on the center tube 1, be equipped with the intercommunication on the sealing ring 3 first through-hole 11 with the second through-hole 31 of stock solution chamber 43.

In the above technical solution, two sealing ring grooves 312 are preferably arranged on the inner annular wall of the sealing ring 3, the two sealing ring grooves 312 are respectively located at the upper side and the lower side of the second through hole 31, an O-shaped sealing ring is embedded in the sealing ring groove 312, and the O-shaped sealing ring is tightly abutted to the central tube 1, so that the sealing performance between the sealing ring 3 and the central tube 1 is further improved. Two connectors 2 set up respectively at the upper and lower both ends of center tube 1, are the mirror image state, and two free ends 41 of packing element 4 and sealing ring 3's lateral wall fixed connection then are fixed in annular space 25 through sealing ring 3 in, have formed a feed liquor route: the first through hole 11-the second through hole 31-the liquid storage cavity 43, when pressure liquid is introduced into the central tube 1, the liquid finally enters the liquid storage cavity 43 from the first through hole 11, the packing element 4 begins to expand until the central tube 1 and the casing (the casing refers to the outer casing forming an annulus with the central tube 1 of the packer, and usually can be consolidated in the well in advance, and what the packer needs to block is the annulus formed between the outer side wall of the central tube 1 and the inner side wall of the casing, which is a conventional structure in the field and is not described in detail), the annulus between the central tube 1 and the casing is sealed, and the seat sealing is completed. When the unsealing is finished, only the pressure liquid in the central tube 1 needs to be unloaded, the liquid in the liquid storage cavity 43 is emptied by the resilience force of the rubber barrel 4, and the rubber barrel 4 is restored to the initial state.

In this embodiment, packing element 4 need not vulcanize as an organic whole with center tube 1 in advance, but is fixed in on center tube 1 through sealing ring 3, in the inflation process of packing element 4, the annular space 25 that is formed by center tube 1 and connector 2 can effectively restrain the deformation of packing element 4 and the 3 junction of sealing ring, make the inflation only take place in packing element 4 and extend the part of annular space 25, thereby the stability in use of packing element 4 has been improved, the problem of common packing element 4 among the prior art tear the seam, influence leakproofness such as vulcanization department breaks away from is solved.

As shown in fig. 1 and 2, step portions 12 which are recessed in the radial direction are respectively disposed at two ends of the central tube 1, the sealing rings 3 are sleeved on the step portions 12, the outer diameter of each sealing ring is consistent with the maximum outer diameter of the central tube 1, the annular space 25 respectively includes a sealing ring space 251 and a rubber tube space 252 from inside to outside, the sealing ring space 251 is consistent with the sealing ring 3 in size, in an initial state, a portion of the rubber tube 4 located in the annular space 25 is filled in the rubber tube space 252, a portion extending out of the annular space 25 is tightly attached to the central tube 1, and the bending portions 42 of the two rubber tubes 4 are abutted to each other.

Among the above-mentioned technical scheme, because two connectors 2 at center tube 1 upper and lower both ends are the mirror image setting, consequently sealing ring 3 and packing element 4 isotructure at upper and lower both ends also are the mirror image setting. Set up step portion 12 on the center tube 1, establish sealing ring 3 cover on step portion 12, then directly compress tightly sealing ring 3 through connector 2 and fix on center tube 1, can avoid the additional connection structure between sealing ring 3 and the center tube 1, the dismouting is more convenient, and sealing ring 3 after compressing tightly just in time inlays and locates in sealing ring space 251. The part of packing element 4 that is close to two free ends 41 is restricted in packing element space 252, and when liquid got into stock solution chamber 43 from first through-hole 11, packing element 4 began to expand, and the part that connector 2 and packing element 4 contacted can exert radial inward power to packing element 4, restraines its inflation, through the combined action of connector 2 and sealing ring 3, firmly locks the free end 41 of packing element 4, has improved the stability in use of packing element 4.

As shown in fig. 3, two annular grooves 32 are formed in the outer side wall of the sealing ring 3, the two annular grooves 32 are located at the upper side and the lower side of the second through hole 31, and an embedded groove 33 is formed in one end, away from the second through hole 31, of each annular groove 32; the free end 41 of the rubber tube 4 is provided with an annular flange 411, the free end 41 of the rubber tube 4 is hermetically embedded into the annular groove 32, and the annular flange 411 is hermetically embedded into the embedded groove 33.

Among the above-mentioned technical scheme, the free end 41 of the fixed packing element 4 of annular groove 32, the annular flange 411 of the fixed free end 41 of embedded groove 33, both cooperate, can fix the more firm sealing of packing element 4 on sealing ring 3, when liquid gets into stock solution chamber 43 from second through-hole 31, packing element 4 inflation produces radial force and axial force, axial force can push two free ends 41 of packing element 4 to axial both ends respectively, make in the insertible embedded groove 33 of annular flange 411 more, the sealing stability of connection has been improved.

The axial both sides of second through-hole 31 are equipped with third through-hole 311 respectively, the cross-section of embedded groove 33 is spherical, and spherical cross-section's entry length is less than its maximum diameter, annular flange 411 have with the corresponding spherical cross-section of embedded groove 33, be equipped with annular cavity 412 in the annular flange 411, be equipped with on the free end 41 and communicate respectively the fourth through-hole 413 of third through-hole 311 and annular cavity 412.

Among the above-mentioned technical scheme, through at the inside ring cavity 412 that sets up of cyclic annular flange 411, make cyclic annular flange 411 have the inflation self sealss effect, when liquid flowed into stock solution chamber 43 from second through-hole 31, partial liquid can pass through third through-hole 311 and fourth through-hole 413 and get into in the ring cavity 412, make cyclic annular flange 411 take place the inflation to inseparabler embedding groove 33 that is full of further improves the leakproofness and the stability that packing element 4 and sealing ring 3 are connected.

The biggest difference between this embodiment and prior art is that, packing element 4 is straight tube-shape among the prior art, and upper and lower both ends are all fixed on center tube 1 through vulcanizing, and the inside wall of packing element 4 and the lateral wall of center tube 1 form sealed stock solution chamber 43 jointly, and when the fluid pressure in packing element 4 was too big, packing element 4 took place very easily with the vulcanization department of center tube 1 and tears and breaks away from to lead to sealed inefficacy. The rubber tube 4 is folded, the two free ends 41 of the rubber tube 4 are connected with the sealing ring 3 to form the sealed liquid storage cavity 43, then the sealing ring 3 is fixed on the central tube 1, the central tube 1 and the connector 2 form the annular space 25, the annular space 25 can limit the expansion of the part, close to the free ends 41, of the rubber tube 4, the connecting area of the two free ends 41 of the rubber tube 4 and the sealing ring 3 is fully protected, and the rubber tube 4 is effectively prevented from being torn and separated when deformed.

Example 2

Combine fig. 1 to fig. 10, this embodiment provides an expanding packer, on embodiment 1's basis, add the bearing structure to packing element 4, this bearing structure not only can restrict the axial inflation degree of packing element 4, improves the setting stability of packer under the high pressure difference environment, and packing element 4's drainage efficiency when also can promoting the deblocking realizes quick deblocking. The specific technical scheme is as follows,

as shown in fig. 4, 5 and 6, 2 circumference equidistance of connector articulate a plurality of bracing pieces 5, and articulated department is equipped with

torsional spring

24, 24 one ends of torsional spring are connected connector 2, and the other end is connected bracing piece 5, bracing piece 5 is hugged closely packing element 4 extends annular space 25's part, and can follow the inflation of packing element 4, by the radial horizontality of rotatory to butt sleeve pipe inner wall of vertical state.

In the above technical solution, in an initial state (i.e. when the packing element 4 is not expanded), as shown in fig. 1, the torsion spring 24 makes the support rod 5 in a vertical state by a torque force, and tightly adheres to a portion of the packing element 4 extending out of the annular space 25, when the packer is set, as shown in fig. 11, liquid enters the liquid storage cavity 43 in the packing element 4, a portion of the packing element 4 extending out of the annular space 25 expands to block an annular space between the casing and the central tube 1, the support rod 5 is pushed to rotate in a horizontal direction when the packing element 4 expands (refer to fig. 1, 9, 10 and 11), the torsion spring 24 accumulates the torque force, the plurality of support rods 5 form an annular limit support structure, the limit support structure can rotate to a horizontal state at the limit to limit and support the packing element 4, because the two packing elements 4 and 2 are arranged in a mirror image, the limit support structure formed by the plurality of support rods 5 connected by the connector is also arranged in a mirror image, rubber cylinder 4 one end after the inflation receives spacing bearing structure to block the support, and the other end receives the support that blocks of another rubber cylinder 4 rather than the mirror image setting, and its inflation receives dual restriction, has effectively avoided the excessive deformation and the wriggling of rubber cylinder 4, has improved the seat seal stability under the high pressure difference environment. When needing the deblocking, unload the pressure liquid in the center tube 1, the packing element 4 realizes under the elastic force of self and contracts, with the liquid discharge in the stock solution chamber 43, torsional spring 24 release moment of torsion simultaneously, and bracing piece 5 is rotatory to vertical direction, extrudees the stock solution chamber 43 of packing element 4 for the discharge of liquid in the stock solution chamber 43, accomplish the deblocking fast.

As shown in fig. 5 and 6, the connector 2 is close to the bent portion 42 one end is equipped with the limit flange 21, the circumference equidistance below the limit flange 21 is equipped with a plurality of rectangular blocks 22, the distance between two adjacent rectangular blocks 22 with the width of bracing piece 5 is unanimous, the circumference both sides of rectangular block 22 are equipped with mounting groove 221 respectively, and articulated shaft 23 level is fixed in the mounting groove 221 of two adjacent rectangular blocks 22, and on the articulated shaft 23 in the mounting groove 221 was located to the torsional spring 24 cover, the one end of bracing piece 5 with articulated shaft 23 pivot connection.

In the above technical solution, the support rod 5 is limited by the limiting flange 21, so that the support rod 5 can only rotate within 90 °.

As shown in fig. 7 and 8, a sliding groove 51 is disposed at a free end of the supporting rod 5, the sliding groove 51 extends along a length direction of the supporting rod 5, a sliding rod 52 is disposed in the sliding groove 51, one end of a first spring 53 is fixed at a bottom of the sliding groove 51, the other end of the first spring 53 is fixedly connected to the sliding rod 52, in an initial state, the supporting rod 5 is in a vertical state, the first spring 53 naturally extends, and the sliding rod 52 extends out of the sliding groove 51 to a bending portion 42 of the glue tube 4.

In the above technical solution, the sliding rod 52 can slide and stretch in the sliding groove 51 of the support rod 5, so as to compensate the overall length of the support rod 5, and in the initial state, the sliding rod 52 extends out of the sliding groove 51 to the maximum extent and is close to the bending part 42 of the packing element 4, so that the packing element 4 is more tightly attached to the side wall of the central tube 1, and the packer can be conveniently put into the casing. When the seat sealing is needed, the rubber tube 4 expands to drive the support rod 5 and the slide rod 52 to rotate towards the horizontal direction, the slide rod 52 is extruded by the inner wall of the sleeve and retracts towards the sliding groove 51, the first spring 53 is compressed to accumulate elastic force, and when the support rod 5 rotates to the horizontal state, the slide rod 52 retracts into the sliding groove 51 to the maximum extent. When needing the deblocking, packing element 4 contracts, and bracing piece 5 is rotatory to vertical direction, and slide bar 52 stretches out in spout 51 under the effect of first spring 53 resilience force, extrudees packing element 4 together in coordination with bracing piece 5, further accelerates the discharge of liquid in packing element 4, realizes quick deblocking.

As shown in fig. 8, a curved roller 54 is connected to a free end of the slide rod 52, an axis of the curved roller 54 is parallel to an axis of the hinge shaft 23, a diameter of the curved roller 54 is equal to a thickness of the support rod 5, a second spring 542 is disposed between two adjacent curved rollers 54, an insertion groove 541 into which the support rod 5 is inserted is disposed on a side of the curved roller 54 facing the support rod 5, when the support rod 5 is in a horizontal state, the slide rod 52 is received in the sliding groove 51, and the curved roller 54 is integrally inserted into the support rod 5.

Among the above-mentioned technical scheme, curved surface roller 54 can butt intraductal wall of sleeve slip, and curved surface roller 54 has the camber unanimous with the radian of intraductal wall of sleeve, can guarantee that intraductal wall of sleeve is not by smooth pole 52 fish tail, and when bracing piece 5 rotated to the horizontality, curved surface roller 54 pegged graft as an organic whole with bracing piece 5, makes connection between them more firm, has improved the stability of supporting. The second spring 542 is provided between the curved rollers 54, and when setting is performed, the support bar 5 rotates to a horizontal state, the second spring 542 is stretched to accumulate elastic force, and when unsetting is performed, the support bar 5 rotates in the vertical direction, and the second spring 542 releases the elastic force, thereby further accelerating the return of the support bar 5 and the slide bar 52, and improving the unsetting efficiency.

As shown in fig. 8, two side walls of the support rod 5 are symmetrically provided with hinge lugs 55, the hinge lugs 55 are hinged to connecting rods 56, the thickness of each connecting rod 56 is the same as that of the support rod 5, the free ends of two adjacent connecting rods 56 are hinged, the hinge lugs 55 are provided in plurality along the length direction of the support rod 5, and high resilience rubber membranes (not shown in the figure) are fixed on one sides of the support rods 5 facing the rubber tube 4 and form an umbrella-shaped structure together with the support rods 5.

Among the above-mentioned technical scheme, connecting rod 56 can fill the space between the adjacent bracing piece 5, improves the bearing area by the annular bearing structure that bracing piece 5 formed, has further improved separation supporting effect, and the high rubber film that kick-backs can form continuous elastic barrier layer, avoids packing element 4 to extend from the gap of bracing piece 5 to the axial.

The working principle and the working process of the embodiment are as follows: when the seat is sealed, pressure liquid is pumped into the central tube 1, the liquid enters the liquid storage cavity 43 of the rubber cylinder 4 and pushes the support rod 5 to rotate in the horizontal direction, the high resilience rubber film is deformed, the torsion spring 24 accumulates torque force, the slide rod 52 rotates along with the support rod 5 in the horizontal direction, the curved roller 54 abuts against the inner wall of the sleeve to slide, the slide rod 52 retracts into the sliding groove 51 under the pushing of the inner wall of the sleeve, the first spring 53 in the sliding groove 51 is compressed and accumulates elastic force, the second spring 542 on the curved roller 54 is stretched and accumulates elastic force, when the support rod 5 rotates to the horizontal state (refer to figure 12), the slide rod 52 is completely accommodated in the sliding groove 51, the free end of the support rod 5 is inserted into the insertion groove 541 of the curved roller 54 to form stable connection, and at this time, the support rod 5, the connecting rod 56 and the high resilience rubber film together form an annular seamless support structure with a metal framework, restriction packing element 4 further inflation warp, and 4 axial one ends of packing element receive annular bearing structure's restriction, and the other end receives the restriction of the packing element 4 after another inflation, and under dual restriction, packing element 4 can not take place excessive deformation, has improved the sealing stability of packing element 4 under the high pressure difference environment. When the deblocking is carried out, pressure liquid in the central tube 1 is unloaded, the rubber cylinder 4 releases resilience force, the high-resilience rubber film releases resilience force, the torsion spring 24 releases torque force, the first spring 53 releases resilience force, the second spring 542 releases resilience force, and under the combined action of the above elements, the support rod 5 and the sliding rod 52 reset rapidly to extrude the rubber cylinder 4, so that the discharge speed of liquid in the liquid storage cavity 43 is accelerated, and the rapid deblocking is completed.

Example 3

The embodiment provides a using method of an expansion packer, which comprises the following steps:

step S100, assembling: connecting an upper connector 2 and a lower connector 2 of the expansion packer with an upstream pipe string and a downstream pipe string respectively, and then putting the connectors into specified positions in a sleeve;

step S200, setting: pumping pressure liquid into the central tube 1, wherein the liquid sequentially enters a liquid storage cavity 43 of the rubber cylinder 4 through a first through hole 11 of the central tube 1 and a second through hole 31 of the sealing ring 3, the part of the rubber cylinder 4, which is positioned in the annular space 25, is limited by the connector 2 and cannot expand, the part of the rubber cylinder 4, which extends out of the annular space 25, simultaneously expands axially and radially until the seating is completed, and after the seating, the two rubber cylinders 4 are axially and hermetically abutted to radially block the annular space between the central tube 1 and the sleeve;

step S300, unsealing: and (3) discharging the pressure liquid in the central tube 1, allowing the liquid in the liquid storage cavity 43 of the rubber cylinder 4 to flow out through the second through hole 31 and the first through hole 11 in sequence, and contracting the rubber cylinder 4 to finish unsealing.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims

1. An expansion packer comprises a central pipe (1), wherein two ends of the central pipe (1) are respectively in threaded connection with a connector (2), it is characterized in that the connector (2) and the central tube (1) form an annular space (25), a sealing ring (3) tightly attached to the outer side wall of the central tube (1) is fixedly arranged in the annular space (25), the outer side wall of the sealing ring (3) is connected with two free ends (41) of the rubber cylinder (4), the rubber cylinder (4) is in a folded ring shape, and forms a sealed liquid storage cavity (43) together with the sealing ring (3), the rubber cylinder (4) axially extends out of the annular space (25), one end far away from the connector (2) forms a bending part (42), a first through hole (11) is formed in the central pipe (1), and a second through hole (31) which is communicated with the first through hole (11) and the liquid storage cavity (43) is formed in the sealing ring (3); when pressure liquid is introduced into the central tube (1), the liquid enters the liquid storage cavity (43) from the first through hole (11), the rubber cylinder (4) expands, and the connectors (2) at the upper end and the lower end of the central tube (1), the sealing ring (3) and the rubber cylinder (4) are arranged in a mirror image manner;

step parts (12) which are inwards concave in the radial direction are respectively arranged at two ends of the central tube (1), the sealing rings (3) are sleeved on the step parts (12), the outer diameters of the sealing rings are consistent with the maximum outer diameter of the central tube (1), the annular space (25) respectively comprises a sealing ring space (251) and a rubber tube space (252) from inside to outside, the size of the sealing ring space (251) is consistent with that of the sealing rings (3), in an initial state, the rubber tube space (252) is filled with the part of the rubber tube (4) which is positioned in the annular space (25), the part extending out of the annular space (25) is tightly attached to the central tube (1), and bent parts (42) of the two rubber tubes (4) are mutually abutted;

two annular grooves (32) are formed in the outer side wall of the sealing ring (3), the two annular grooves (32) are located on the upper side and the lower side of the second through hole (31), and an embedded groove (33) is formed in one end, far away from the second through hole (31), of each annular groove (32); the free end (41) of the rubber sleeve (4) is provided with an annular flange (411), the free end (41) of the rubber sleeve (4) is embedded into the annular groove (32) in a sealing mode, and the annular flange (411) is embedded into the embedded groove (33) in a sealing mode.

2. An expandable packer according to claim 1, characterised in that the second through hole (31) is provided with third through holes (311) on both axial sides, the section of the embedded groove (33) is spherical, the inlet length of the spherical section is smaller than the maximum diameter thereof, the annular flange (411) has a spherical section corresponding to the embedded groove (33), an annular cavity (412) is provided in the annular flange (411), and a fourth through hole (413) communicating the third through hole (311) and the annular cavity (412) is provided in the free end (41).

3. An expanding packer according to claim 2, characterised in that the connector (2) is hinged with a plurality of support rods (5) at equal distances around the circumference, a torsion spring (24) is arranged at the hinge, one end of the torsion spring (24) is connected with the connector (2), the other end of the torsion spring is connected with the support rods (5), the support rods (5) are tightly attached to the part of the rubber sleeve (4) extending out of the annular space (25) and can radially rotate to the horizontal state abutting against the inner wall of the sleeve along with the expansion of the rubber sleeve (4).

4. The expanding packer of claim 3, wherein the connector (2) is provided with a limiting flange (21) near one end of the bending part (42), a plurality of rectangular blocks (22) are arranged below the limiting flange (21) at equal intervals on the circumference, the distance between two adjacent rectangular blocks (22) is consistent with the width of the support rod (5), mounting grooves (221) are respectively arranged on two circumferential sides of the rectangular blocks (22), the hinge shaft (23) is horizontally fixed in the mounting grooves (221) of two adjacent rectangular blocks (22), the torsion spring (24) is sleeved on the hinge shaft (23) in the mounting grooves (221), and one end of the support rod (5) is pivotally connected with the hinge shaft (23).

5. An expandable packer according to claim 4, wherein a sliding groove (51) is formed at a free end of the support rod (5), the sliding groove (51) extends along the length direction of the support rod (5), a sliding rod (52) is arranged in the sliding groove (51), one end of a first spring (53) is fixed at the bottom of the sliding groove (51), the other end of the first spring is fixedly connected with the sliding rod (52), in an initial state, the support rod (5) is in a vertical state, the first spring (53) naturally extends, and the sliding rod (52) extends out of the sliding groove (51) to a bending part (42) of the packing element (4).

6. An expandable packer as claimed in claim 5, wherein the free end of the sliding rod (52) is connected with a curved roller (54), the axis of the curved roller (54) is parallel to the axis of the hinge shaft (23), the diameter of the curved roller (54) is the same as the thickness of the support rod (5), a second spring (542) is arranged between two adjacent curved rollers (54), one side of the curved roller (54) facing the support rod (5) is provided with a plug-in groove (541) for the support rod (5) to be inserted into, when the support rod (5) is in a horizontal state, the sliding rod (52) is accommodated in the sliding groove (51), and the curved roller (54) and the support rod (5) are plugged into a whole.

7. An expandable packer according to claim 6, wherein the two side walls of the supporting rod (5) are symmetrically provided with hinge lugs (55), the hinge lugs (55) are hinged with connecting rods (56), the thickness of each connecting rod (56) is equal to that of the supporting rod (5), the free ends of two adjacent connecting rods (56) are hinged, the hinge lugs (55) are provided in plurality along the length direction of the supporting rod (5), and a high-resilience rubber membrane is fixed on one side of the supporting rods (5) facing the rubber sleeve (4) and forms an umbrella-shaped structure together with the supporting rods (5).

8. The method of using an expandable packer according to claim 1, comprising the steps of:

step S100, assembling: connecting an upper connector (2) and a lower connector (2) of the expansion packer with an upstream pipe string and a downstream pipe string respectively, and then putting the connectors into specified positions in a sleeve;

step S200, setting: pumping pressure liquid into the central tube (1), enabling the liquid to enter a liquid storage cavity (43) of the rubber cylinder (4) through a first through hole (11) of the central tube (1) and a second through hole (31) of the sealing ring (3) in sequence, limiting the part, located in the annular space (25), of the rubber cylinder (4) by the connector (2) so that the rubber cylinder cannot expand, enabling the part, extending out of the annular space (25), of the rubber cylinder (4) to expand axially and radially at the same time until seating is completed, and after the seating, enabling the two rubber cylinders (4) to abut axially in a sealing mode and radially block an annulus between the central tube (1) and a sleeve;

step S300, unsealing: pressure liquid in the central tube (1) is discharged, liquid in the liquid storage cavity (43) of the rubber cylinder (4) flows out through the second through hole (31) and the first through hole (11) in sequence, and the rubber cylinder (4) shrinks to finish unsealing.