CN214532890U

CN214532890U - Expanding packer and oil production pipe column

Info

Publication number: CN214532890U
Application number: CN202021780446.8U
Authority: CN
Inventors: 黎文才; 曹海燕; 吴坤琪; 李英; 郭保卫; 康金成
Original assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Current assignee: China Petroleum and Chemical Corp; Petroleum Engineering Technology Research Institute of Sinopec Zhongyuan Oilfield Co
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-10-29
Anticipated expiration: 2030-08-24

Abstract

The utility model relates to an expanding packer and oil production pipe. An expandable packer, comprising: a central body having a cavity; the central body is sleeved with a valve seat and a rubber cylinder assembly, a first annular cavity is defined between the valve seat and the central body, and a second annular cavity is defined between the rubber cylinder assembly and the central body; the elastic sealing part is used for being in sealing fit with the valve seat so as to cut off the first annular cavity and the second annular cavity; further comprising: the annular piston cylinder is sleeved on the central body and is positioned above the valve body, and a sealing annular cavity is enclosed by the annular piston cylinder, the central body and the valve body or enclosed by the annular piston cylinder and the central body; the central body liquid inlet hole is arranged on the cavity wall of the cavity and is communicated with the cavity and the sealing ring cavity; the valve seat liquid inlet hole is formed in the valve seat and communicated with the first annular cavity and the sealing annular cavity; the annular piston cylinder comprises an annular piston and a sealing sleeve, the sealing sleeve is formed by downward extension of the annular piston, the sealing sleeve is provided with a sealing section, and the sealing section is arranged close to the outer side of the valve body or the outer side of the central body.

Description

Expanding packer and oil production pipe column

Technical Field

The utility model relates to an expanding packer and oil production pipe.

Background

The packer is suitable for the processes of layered oil testing, water finding, bottom water plugging and the like, and is particularly suitable for casing change wells or highly deviated wells in which conventional tools cannot be put in. The packer comprises an expansion packer, an expansion rubber sleeve is sleeved on a central pipe of the expansion packer, and when the packer is set, liquid in an oil pipe directly acts on an inner cavity of the rubber sleeve to enable the rubber sleeve to expand and block a lower layer.

The Chinese utility model patent with the publication number of CN203808920U discloses an expanding packer, which comprises a central tube, wherein the upper end of the central tube is connected with an upper joint in a threaded manner, the lower end of the central tube is connected with a lower joint in a threaded manner, and the outer side of the central tube is sequentially sleeved with a deblocking outer sleeve, a valve seat, a connecting sleeve and a rubber sleeve component from top to bottom; the upper end of the deblocking outer sleeve is connected with the outer side face of the upper joint in a sealing mode, the lower end of the deblocking outer sleeve is connected with the valve seat in a threaded mode, an upper annular space is formed between the deblocking outer sleeve and the central pipe, a sealing annular plug is arranged in the upper annular space and fixedly arranged on the central pipe, a drainage hole communicated with the upper annular space is formed in the side wall of the deblocking outer sleeve, and the drainage hole is located above the sealing annular plug; a middle annular space is formed among the valve seat, the connecting sleeve and the central tube, an elastic sealing part (namely an elastic locking part) is arranged in the middle annular space, an annular part is convexly arranged on the inner side wall of the valve seat, a flow channel is formed between the annular part and the central tube, a liquid inlet hole communicated with the middle annular space is arranged on the side wall of the central tube, the liquid inlet hole is positioned above the elastic sealing part, and the elastic sealing part is matched with the annular part to block or open the flow channel; be formed with down the annular space between center tube and the packing element subassembly, down the annular space including interior annular space and outer annular space.

When setting, injecting liquid into the oil pipe for pressurizing, enabling the liquid to enter the middle annular space through a liquid inlet hole of the central pipe, generating hydraulic pressure at the position of the flow channel, and enabling the hydraulic pressure to overcome the elastic acting force of the pressure spring to open the elastic sealing part so that the liquid enters the lower annular space through the middle annular space, and further enabling a rubber cylinder in the rubber cylinder assembly to expand for setting; when stopping annotating liquid and suppressing, the elasticity sealing resets and the shutoff runner under the elastic force of self pressure spring for the liquid in the lower annular space can not flow back, ensures that the packer keeps the setting state.

After the expandable packer is set, if high-pressure construction such as fracturing and squeezing and blocking construction is carried out, the elastic sealing part can be opened by high-pressure fluid to continue entering the lower annular space, so that the lower annular space is continuously pressurized, the rubber sleeve is continuously expanded without stop, and the rubber sleeve is further expanded and broken.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an expansion packer to solve the technical problem that after the packer in the prior art is sealed, if high-pressure construction is carried out, a rubber cylinder is easy to burst; an object of the utility model is to provide an oil production pipe to solve the packer among the prior art and set up the back, if carry out the high pressure construction then lead to the packing element easily to have the technical problem of the broken risk of inflation.

In order to achieve the above purpose, the utility model discloses expanding packer's technical scheme is:

an expandable packer, comprising:

the central body is provided with a cavity which is used for being communicated with the inner cavity of the oil pipe;

a valve seat and a rubber cylinder assembly are sequentially sleeved on the central body from top to bottom, a first annular cavity is defined between the valve seat and the central body, and a second annular cavity is defined between the rubber cylinder assembly and the central body;

the elastic sealing part is positioned between the valve seat and the rubber cylinder assembly and is used for being in sealing fit with the valve seat so as to cut off the first annular cavity and the second annular cavity;

further comprising:

the annular piston cylinder is sleeved on the central body and is positioned above the valve body, the annular piston cylinder is directly or indirectly fixed on the central body through shear pins, and a sealing annular cavity is enclosed by the annular piston cylinder, the central body and the valve body or enclosed by the annular piston cylinder and the central body;

the central body liquid inlet hole is arranged on the cavity wall of the cavity and is communicated with the cavity and the sealing ring cavity;

the valve seat liquid inlet hole is formed in the valve seat and communicated with the first annular cavity and the sealing annular cavity;

the annular piston cylinder comprises an annular piston and a sealing sleeve, the sealing sleeve is formed by downward extension of the annular piston, the sealing sleeve is provided with a sealing section, and the sealing section is arranged close to the outer side of the valve body or the outer side of the central body;

before the shear pin is sheared, the sealing section is positioned below the central body liquid inlet hole or the valve seat liquid inlet hole, and the central body liquid inlet hole is communicated with the valve seat liquid inlet hole; after the shear pin is cut off by the hydraulic pressure force generated by the high-pressure liquid below the annular piston, the sealing sleeve moves upwards along with the annular piston, the sealing section is in sealing fit with the valve seat to seal the liquid inlet hole of the valve seat or the sealing section is in sealing fit with the central body to seal the liquid inlet hole of the central body, and then the liquid inlet hole of the central body and the liquid inlet hole of the valve seat are cut off.

The beneficial effects are that: through set up annular piston cylinder in the top of valve body on the center tube, after packing element accomplishes the seat and seals, the shear pin is cut by the hydraulic pressure force that the high-pressure liquid below the annular piston produced, the seal cover moves up along with annular piston, sealed section and disk seat sealing fit are sealed with the feed liquor hole of valve seat or sealed section and central body sealing fit are sealed with the feed liquor hole of central body in order to cut off central body feed liquor hole and disk seat feed liquor hole, when avoiding follow-up high pressure construction, high-pressure fluid continuously pours into and causes the risk that the packing element bursts into.

Furthermore, the sealing section is arranged close to the outer side of the valve body, the inner side of the sealing section is provided with two groups of third sealing rings which are arranged at intervals along the axial direction of the central body, the sealing sleeve moves upwards along with the annular piston, and the two groups of third sealing rings on the sealing section are respectively positioned above and below the liquid inlet hole of the valve seat.

The beneficial effects are that: the sealing section is arranged close to the outer side of the valve body, so that the structure can be simplified, and the sealing section is convenient to be matched with the valve seat in a sealing manner.

Furthermore, the outer side of the valve seat is provided with three sealing rings, two groups of the three sealing rings are arranged at intervals along the axial direction of the central body, the two groups of the three sealing rings are respectively positioned above and below the liquid inlet hole of the valve seat, the sealing sleeve moves upwards along with the annular piston, and the two groups of the three sealing rings on the valve seat are both positioned between the valve seat and the sealing section.

Furthermore, the upper end of the central body is provided with an upper connector, a piston sleeve is sleeved on the central body between the upper connector and the valve body, and the annular piston cylinder is fixed on the piston sleeve through shear pins so as to be indirectly fixed on the central body; and a liquid discharge hole is formed in the piston sleeve and is positioned above the annular piston cylinder.

The beneficial effects are that: therefore, the annular piston cylinder is convenient to fix, the piston sleeve can also play a certain protection role on the annular piston cylinder, and impurities such as silt can be prevented from entering between the central tube and the annular piston.

Further, annular piston cylinder still includes the locking portion that upwards extends by annular piston, be equipped with locking cooperation portion on central body or the piston sleeve, after annular piston cylinder rebound, through the locking cooperation of locking portion with locking cooperation portion to locking annular piston cylinder makes central body feed liquor hole and disk seat feed liquor hole keep the off-state.

The beneficial effects are that: by the design, after high-pressure construction is completed, the annular piston cylinder is ensured not to fall back under the pressure of the oil sleeve annulus.

Further, the locking part is provided with external threads, and the locking matching part is a locking ring with internal threads, and the locking ring is arranged on the piston sleeve.

The beneficial effects are that: the locking mode is simple, and locking of the annular piston cylinder is facilitated.

Furthermore, the upper end of the piston sleeve is in threaded connection with the outer side of the upper connector, an annular protrusion is arranged on the inner side of the piston sleeve and located below the upper connector, an annular groove is defined by the annular protrusion and the upper connector, the opening of the annular groove faces the inner side, and the locking ring is installed in the annular groove.

The beneficial effects are that: the design is convenient for the installation of the locking ring.

Furthermore, the expanding packer is an expanding bridge plug, the central body comprises a central tube at the upper part and a central rod at the lower part, the lower end of the central tube is in threaded connection with the upper end of the central rod, and the central rod is of a solid structure.

Furthermore, the elastic sealing part comprises a sealing head above and a pressure spring below, the sealing head is used for being in sealing fit with the valve seat, the pressure spring is used for applying an elastic acting force towards the valve seat to the sealing head, an upper spring seat is arranged at the upper end of the pressure spring, a lower spring seat is arranged at the lower end of the pressure spring, and the upper spring seat is located between the sealing head and the pressure spring.

The beneficial effects are that: the upper spring seat and the lower spring seat are respectively arranged at the upper end and the lower end of the pressure spring, so that the stability of the pressure spring in the stretching process is ensured.

In order to achieve the above purpose, the utility model discloses oil production pipe's technical scheme is:

the oil production string comprises an oil pipe, and an expansion packer is connected to the oil pipe;

the expandable packer comprises:

further comprising:

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the expandable packer of the present invention;

FIG. 2 is a schematic view of the ring piston of FIG. 1;

FIG. 3 is a schematic view of the structure at the elastomeric seal of FIG. 1;

in the figure: 1-upper joint; 2-a central tube; 3-a locking ring; 4-liquid discharge hole; 5-a piston sleeve; 6-cutting nails; 7-an annular piston; 8-sealing sleeve; 9-valve seat liquid inlet hole; 10-a third seal ring; 11-a valve seat; 12-an elastic seal; 121-rubber valve head; 122-valve body; 123-spring mounting; 124-pressure spring; 125-lower spring seat; 13-gluing a cylinder seat; 14-upper rubber sleeve sheath; 15-expanding rubber cylinder; 16-setting a rubber cylinder sheath; 17-lower rubber cylinder seat; 18-a central rod; 19-lower annulus; 20-middle annulus; 21-a sealing section; 22-a first sealing ring; 23-central body liquid inlet hole; 24-upper annulus; 25-a second seal ring; 26-locking part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses embodiment 1 of expanding packer:

as shown in fig. 1, the expandable packer in this embodiment is an expandable bridge plug, and includes an upper central tube 2 and a lower central tube 18, the upper end of the central tube 18 is provided with an external thread, the lower end of the central tube 2 is provided with an internal thread, the central tube 18 is in threaded sealing connection with the central tube 2, wherein the central tube 2 and the central tube 18 together form a central body; the central tube 2 is provided with a cavity, the upper end of the central tube 2 is provided with an upper joint 1 in threaded sealing connection, and the upper joint 1 is connected with a special delivery tool; the central rod 18 is of a solid structure, the whole central rod 18 is of an inverted T shape, and the lower end of the central rod 18 is provided with a chamfer structure. In other embodiments, the expandable packer is a conventional packer, i.e., the centerbody is a base pipe.

In this embodiment, the outer side of the central tube 2 is sequentially sleeved with the piston sleeve 5 and the valve seat 11, an upper annular space 24 is defined between the piston sleeve 5 and the central tube 2 as well as between the valve seat 11 and the central tube 2, and a middle annular space 20 is defined between the valve seat 11 and the central tube 2. Wherein, the annular part of the upper annular 24 below the annular piston 7 forms a sealed annular cavity, and the middle annular 20 forms a first annular cavity.

As shown in fig. 1 and 2, the upper end of the piston sleeve 5 is screwed and sealed on the outer side of the upper connector 1, and the lower end of the piston sleeve 5 is screwed and sealed on the outer side of the valve seat 11; the inner side of the upper part of the piston sleeve 5 is provided with an annular convex part which is positioned below the upper joint 1 and is abutted against the lower end surface of the upper joint 1.

In this embodiment, the inner side of the annular protrusion and the upper joint 1 define an annular groove, a locking ring 3 is disposed in the annular groove, the locking ring 3 has an internal thread, and the locking ring 3 and the central tube 2 are spaced apart in the radial direction to form an annular space into which the locking portion 26 of the annular piston 7 enters. Wherein, the lower side cell wall of annular groove is the inclined plane, and this inclined plane from top to bottom, outside-in slope, the lower extreme and this inclined plane adaptation of catch 3 to guarantee the stability of catch and locking portion locking.

In this embodiment, the lower end of the valve seat 11 is in threaded connection with the upper rubber cylinder seat 13 of the rubber cylinder assembly, and a first sealing ring 22 is arranged between the inner side of the upper end of the valve seat 11 and the outer side of the central tube 2; the valve seat 11 is provided with a valve seat liquid inlet hole 9, and the valve seat liquid inlet hole 9 is communicated with the annular part of the middle annular 20 and the upper annular 24 below the annular piston 7.

As shown in fig. 2, the annular piston 7 is sleeved on the central tube 2 and is located in the upper annular space 24, the outer side of the annular piston 7 is fixedly connected with the piston sleeve 5 through the shear pin 6, the inner side of the annular piston 7 is attached to the outer side of the central tube 2, and a second sealing ring 25 is arranged between the annular piston 7 and the central tube 2. The piston sleeve 5 is provided with a liquid discharge hole 4, and the liquid discharge hole 4 is positioned above the annular piston 7 and is used for communicating the annular part of the upper annular 24 above the annular piston 7 with the outside of the piston sleeve 5.

Wherein, be equipped with central body feed liquor hole 23 on the center tube 2, central body feed liquor hole 23 is located between annular piston 7 and disk seat 11, and between the first sealing washer 22 of central body feed liquor hole 23 department and the second sealing washer 25 promptly, central body feed liquor hole 23 intercommunication center tube 2's cavity and the annular part of last annular 24 below annular piston 7, and then realize the intercommunication of central body feed liquor hole 23 and disk seat feed liquor hole 9.

In this embodiment, a locking portion 26 extends upward from the upper portion of the central tube 2, the locking portion 26 is of an annular structure, and an external thread is disposed on the outer side of the upper portion of the locking portion 26; after the shear pin 6 is sheared, the locking part 26 moves upwards along with the annular piston 7 and enters into an annular space formed by the locking ring 3 and the central tube 2, and the external thread of the locking part 26 is in locking fit with the internal thread of the locking ring 3 to lock the annular piston 7. The manner of locking of the locking portion 26 and the locking ring 3 is prior art and will not be described in detail herein.

In this embodiment, the lower portion of the central tube 2 extends downward and is provided with a sealing sleeve 8, the sealing sleeve 8 is provided with a sealing section 21, the inner side of the sealing section 21 is provided with third sealing rings 10, and the third sealing rings 10 are arranged in two groups at intervals along the axial direction of the central tube 2. Before the shear pin 6 is sheared, the sealing section 21 is positioned below the liquid inlet hole 9 of the valve seat, namely, the two groups of third sealing rings 10 are positioned below the liquid inlet hole 9 of the valve seat; after the shear pin 6 is cut off, the sealing section 21 moves upwards along with the annular piston 7, when the external thread of the locking part 26 is locked and matched with the internal thread of the locking ring 3, the annular piston 7 is locked, at the moment, the two groups of third sealing rings 10 on the sealing section 21 are respectively positioned above and below the valve seat liquid inlet hole 9, so that the sealing section 21 is in sealed matching with the valve seat 11, and the central body liquid inlet hole 23 and the valve seat liquid inlet hole 9 are cut off.

Wherein, annular piston 7, locking portion 26 and seal cover 8 constitute annular piston cylinder jointly.

As shown in fig. 1, a rubber sleeve assembly is sleeved on the outer side of the central rod 18, and a lower annular space 19 is defined between the rubber sleeve assembly and the central rod 18, wherein the lower annular space 19 forms a second annular space. Specifically, the rubber cylinder assembly comprises an upper rubber cylinder base 13, an upper rubber cylinder jacket 14, an expansion rubber cylinder 15, a lower rubber cylinder base 17 and a lower rubber cylinder jacket 16; the upper end thread sealing of going up cartridge holder 13 connects in the outside of disk seat 11, goes up the inboard of last cartridge sheath 14 of lower extreme thread sealing of cartridge holder 13, and the upper end clamp of expanding packing element 15 is established between last cartridge holder 13 and last cartridge sheath 14, all is equipped with concave-convex structure between expanding packing element 15 and last cartridge holder 13 and last cartridge sheath 14 to guarantee the fastness when expanding packing element 15 and last cartridge holder 13 and last cartridge sheath 14 vulcanize the shaping.

In this embodiment, be equipped with the sealing washer between the inboard of lower packing element seat 17 and the outside of well core rod 18, the outside thread sealing connection of lower packing element seat 17 is in the inboard of packing element sheath 16 down, and the lower extreme clamp of expanding packing element 15 is established between packing element seat 17 and lower packing element sheath 16 down, all is equipped with concave-convex structure between expanding packing element 15 and lower packing element seat 17 and the lower packing element sheath 16 to guarantee the fastness when expanding packing element 15 vulcanizes the shaping with lower packing element seat 17 and lower packing element sheath 16.

As shown in fig. 1 and 3, an elastic seal portion 12 is provided between the inner side of the upper cylinder base 13 and the outer side of the joint position of the center tube 2 and the center rod 18. Specifically, the elastic sealing portion 12 includes a rubber valve head 121, a valve body 122, an upper spring seat 123, a compression spring 124, and a lower spring seat 125; the rubber valve head 121 is pressed against the sealing conical surface at the lower end of the valve seat 11 under the action of the pressure spring 124, the rubber valve head 121 is vulcanized and formed on the valve body 122, the lower end surface of the valve body 122 is supported on the upper end surface of the upper spring seat 123, the lower end surface of the upper spring seat 123 is pressed against by the upper end of the pressure spring 124, and the lower end of the pressure spring 124 is pressed against the upper end surface of the lower spring seat 125, so that the lower spring seat 125 is supported on the upper rubber cylinder seat 13. The pressure spring 124 is a pressure spring sleeved at the lower end of the central tube 2, the rubber valve body 121 and the valve body 122 jointly form a sealing head, and the elastic sealing part 12 and the valve seat 11 jointly form a check valve.

In this embodiment, a sealing ring is disposed between the valve body 122 and the central tube 2 to prevent high-pressure fluid from entering the lower annulus 19 between the valve body 122 and the central tube 2.

In this embodiment, the upper spring seat 123 is an annular structure, and the upper spring seat 123 is sleeved on the central tube 2; the lower spring seat 125 is an annular structure, and the lower spring seat 125 is disposed on the central rod 18.

When the expansion type rubber cylinder 15 is used, the upper end of the upper connector 1 is connected with a special delivery tool and delivered by an oil pipe, and in the process of dropping, as the rubber valve head 121 tightly pushes and seals on the sealing conical surface of the valve seat 11 under the action of the pre-tightening elastic force of the pressure spring 124, the liquid in the oil pipe cannot enter the lower annular space 19, and the expansion type rubber cylinder 15 keeps a contracted state; when the well head is lowered to a designated position, the well head is injected and pressurized, high-pressure fluid is transmitted to the rubber valve head 121 of the elastic sealing part 12 from the central body liquid inlet hole 23, the upper annular cavity 24, the valve seat liquid inlet hole 9 and the middle annular cavity 20, the rubber valve head 121, the valve body 122 and the upper spring seat 123 are pushed to overcome the spring compression force of the compression spring 124 to move downwards so as to open the elastic sealing part 12, the high-pressure fluid enters the lower annular cavity 19 from the middle annular cavity 20 and acts on the inner side of the expansion type rubber cylinder 15, and the expansion type rubber cylinder 15 is pushed to expand outwards to be seated on the wall of the casing pipe, so that the seating is completed. Wherein, the expandable rubber cylinder 15 drives the lower rubber cylinder base 17 and the lower rubber cylinder sheath 16 to move upwards when expanding outwards.

If the wellhead stops pressing at the moment, under the action of the pressure spring 124, the upper end of the rubber valve head 121 is pressed against the sealing conical surface of the valve seat 11 again, so that the liquid in the lower annular space 19 is prevented from flowing back to keep a setting state; when a preset setting force is reached, the annular piston 7 is subjected to an upward acting force, the annular piston 7 shears the shear pin 6 to move upwards until the locking part 26 of the annular piston 7 is locked on the locking ring 3, and at the moment, the two groups of third sealing rings 10 between the sealing section 21 and the valve seat 11 are respectively positioned above and below the valve seat liquid inlet hole 9 to cut off the upper annular space 24 and the middle annular space 20, so that high-pressure liquid in the oil pipe cannot enter the middle annular space 20 no matter what construction pressure, namely the high-pressure liquid cannot enter the lower annular space 19, and the rubber cylinder cannot be burst. Wherein, in the process of upward movement of the annular piston 7, the liquid above the annular piston 7 flows out through the liquid discharge hole 4.

The utility model discloses embodiment 2 of expanding packer:

in embodiment 1, the sealing section 21 is disposed closely to the outer side of the valve body 11, two sets of third sealing rings 10 are disposed on the sealing section 21, before the shear pin 6 is sheared, the valve seat liquid inlet hole 9 and the center body liquid inlet hole 23 are not cut by the two sets of third sealing rings 10, and after the shear pin 6 is sheared, the two sets of third sealing rings 10 are respectively disposed above and below the valve seat liquid inlet hole 9 to cut the valve seat liquid inlet hole 9 and the center body liquid inlet hole 23, so that the rubber sleeve is prevented from being burst during high-pressure construction. In the embodiment, the sealing sleeve 8 comprises a vertical section and a horizontal section, the sealing section is positioned at the inner end of the horizontal section, a sealing ring is arranged between the vertical section and the piston sleeve, a communicating hole is formed in the horizontal section, the sealing section is arranged in a manner of being attached to the outer side of the central pipe, two groups of third sealing rings are arranged on the sealing section, before the shear pin is sheared, the liquid inlet holes of the valve seat and the liquid inlet hole of the central body are not cut off by the two groups of third sealing rings, and the liquid inlet holes of the valve seat and the liquid inlet hole of the central body pass through the communicating hole; after the shear pin is sheared, the two groups of third sealing rings are respectively positioned above and below the liquid inlet hole of the central body so as to cut off the liquid inlet hole of the valve seat and the liquid inlet hole of the central body and avoid the rubber sleeve from bursting during high-pressure construction.

The utility model discloses embodiment 3 of expanding packer:

in embodiment 1, the sealing section 21 is disposed closely to the outer side of the valve body 11, two sets of third sealing rings 10 are disposed on the sealing section 21, before the shear pin 6 is sheared, the valve seat liquid inlet hole 9 and the center body liquid inlet hole 23 are not cut by the two sets of third sealing rings 10, and after the shear pin 6 is sheared, the two sets of third sealing rings 10 are respectively disposed above and below the valve seat liquid inlet hole 9 to cut the valve seat liquid inlet hole 9 and the center body liquid inlet hole 23, so that the rubber sleeve is prevented from being burst during high-pressure construction. In the embodiment, on the basis that the sealing section is arranged close to the outer side of the valve body, the outer side of the valve seat is provided with the third sealing rings, the third sealing rings are arranged in two groups at intervals along the axial direction of the central pipe, the two groups of the third sealing rings are respectively positioned above and below the liquid inlet hole of the valve seat, before the shear pin is sheared, the sealing section is only not contacted with the third sealing rings below the liquid inlet hole of the valve seat, and the liquid inlet hole of the valve seat and the liquid inlet hole of the central body are not cut off; after the shear pin is sheared, the sealing section is in contact with the third sealing rings above and below the liquid inlet hole of the valve seat so as to cut off the liquid inlet hole of the valve seat and the liquid inlet hole of the central body, and the rubber sleeve is prevented from being burst during high-pressure construction.

The utility model discloses embodiment 4 of expanding packer:

in embodiment 1, the outer side of the upper end of the locking part 26 of the annular piston 7 is provided with an external thread, the inner side of the annular protrusion of the piston sleeve 5 is provided with the locking ring 3, and after the annular piston 7 moves upwards, the locking part 26 is matched with the locking ring 3 in a locking manner to lock the annular piston 7, so that the central body liquid inlet hole 23 and the valve seat liquid inlet hole 9 are kept in a cutting-off state. In this embodiment, the inside of locking portion is equipped with the annular groove, is equipped with the catch in the annular groove, is equipped with the external screw thread on the outer wall of center tube, after annular piston rebound, through the locking cooperation of the catch on the locking portion with the external screw thread on the center tube to locking annular piston, and then make central body feed liquor hole and disk seat feed liquor hole keep the off-state.

In other embodiments, the locking portion and the locking ring may not be provided, that is, the annular piston is not locked after moving up, and the annular piston is lifted up at each high pressure construction and falls down again after the construction.

The utility model discloses embodiment 5 of expanding packer:

in embodiment 1, the outer side of the upper end of the locking portion 26 of the annular piston 7 is provided with an external thread, the inner side of the annular protrusion of the piston sleeve 5 is provided with the locking ring 3, the locking ring 3 forms a locking matching portion, and after the annular piston 7 moves upward, the locking portion 26 is matched with the locking ring 3 in a locking manner to lock the annular piston 7, so that the central body liquid inlet hole 23 and the valve seat liquid inlet hole 9 are kept in a cut-off state. In this embodiment, be equipped with the barb structure on the locking portion, be equipped with the recess on the outer wall of center tube, after annular piston rebound, barb on the locking portion enters into the recess to locking annular piston, and then make central body feed liquor hole and disk seat feed liquor hole keep the off-state. Wherein the recess constitutes a locking engagement.

The utility model discloses embodiment 6 of expanding packer:

in embodiment 1, the annular protrusion and the upper joint 1 enclose an annular groove, the opening of the annular groove faces the inside, and the annular groove is used for installing a lock ring. In this embodiment, the annular projection is wider in the axial direction of the center tube, and the inner side surface of the annular projection itself has an annular groove to fit the lock ring.

The utility model discloses the embodiment of oil production pipe, oil production pipe in this embodiment include oil pipe, are connected with the expanding packer on the oil pipe, and this expanding packer is arbitrary in 1 to 6 embodiments of above-mentioned expanding packer the structure the same, no longer describe here.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. An expandable packer, comprising:

it is characterized by also comprising:

the sealing section is used for being positioned below the central body liquid inlet hole or the valve seat liquid inlet hole when the shear pin is not sheared, so that the central body liquid inlet hole is communicated with the valve seat liquid inlet hole; the sealing sleeve is used for moving upwards along with the annular piston when a shear pin is sheared off by hydraulic pressure generated by high-pressure liquid below the annular piston, so that the sealing section is in sealing fit with the valve seat to seal the valve seat liquid inlet hole or the sealing section is in sealing fit with the central body to seal the central body liquid inlet hole, and further the central body liquid inlet hole and the valve seat liquid inlet hole are cut off.

2. The expandable packer of claim 1, wherein the seal segment is disposed adjacent to an outer side of the valve body, and wherein a third seal ring is disposed on an inner side of the seal segment, and wherein two sets of the third seal rings are axially spaced apart along the central body, and wherein the seal sleeve moves upward along with the annular piston, and wherein the two sets of the third seal rings on the seal segment are respectively disposed above and below the liquid inlet hole of the valve seat.

3. The expandable packer of claim 1, wherein the valve seat includes two sets of third seal rings spaced axially along the central body, the two sets of third seal rings being disposed above and below the fluid inlet opening of the valve seat, the sealing sleeve moving upwardly with the annular piston, the two sets of third seal rings being disposed between the valve seat and the sealing segment.

4. An expandable packer as claimed in claim 1, 2 or 3, wherein the central body has an upper end provided with an upper joint, a piston sleeve is sleeved on the central body between the upper joint and the valve body, and the annular piston cylinder is fixed on the piston sleeve by shear pins so as to be indirectly fixed on the central body; and a liquid discharge hole is formed in the piston sleeve and is positioned above the annular piston cylinder.

5. The expandable packer as claimed in claim 4, wherein the annular piston cylinder further comprises a locking portion extending upward from the annular piston, and the central body or the piston sleeve is provided with a locking engagement portion for locking the annular piston cylinder by locking engagement of the locking portion and the locking engagement portion after the annular piston cylinder moves upward, so that the central body fluid inlet hole and the valve seat fluid inlet hole are kept in a cut-off state.

6. The expandable packer of claim 5, wherein the locking portion has an external thread and the lock engagement portion is a lock ring having an internal thread, the lock ring being disposed on the piston sleeve.

7. The expandable packer of claim 6, wherein the upper end of the piston sleeve is threaded on the outside of the upper sub, the inside of the piston sleeve is provided with an annular protrusion below the upper sub, the annular protrusion and the upper sub define an annular groove, the annular groove opens to the inside, and the locking ring is mounted in the annular groove.

8. A expandable packer as claimed in claim 1, 2 or 3, wherein the expandable packer is an expandable bridge plug, the central body comprises an upper central tube and a lower central rod, the lower end of the central tube is in threaded connection with the upper end of the central rod, and the central rod is of a solid structure.

9. The expandable packer according to claim 1, 2 or 3, wherein the elastic sealing portion comprises an upper sealing head and a lower compression spring, the sealing head is used for being in sealing fit with the valve seat, the compression spring is used for applying an elastic acting force towards the valve seat to the sealing head, an upper spring seat is arranged at the upper end of the compression spring, a lower spring seat is arranged at the lower end of the compression spring, and the upper spring seat is located between the sealing head and the compression spring.

10. A production string comprising tubing to which is attached an expandable packer, wherein the expandable packer is as claimed in any one of claims 1 to 9.