CN207686663U - expanding packer - Google Patents

Abstract

The utility model discloses an expanding packer, include: the device comprises an upper connector (1), a core pipe (2) connected with the upper connector (1), a rubber cylinder mechanism (3) sleeved on the core pipe (2) and hermetically connected with the upper connector (1), and a lower connector (4) hermetically connected with the rubber cylinder mechanism (3); the rubber tube mechanism (3) comprises: the rubber sleeve (301) is a first rubber sleeve (302) connected with the first end (3011) of the rubber sleeve in a sealing mode, the first rubber sleeve (302) is further connected with the upper connector (1) in a sealing mode, the second rubber sleeve (303) connected with the second end (3012) of the rubber sleeve in a sealing mode, and the second rubber sleeve (303) is further connected with the lower connector (4) in a sealing mode; the expandable packer further comprises: a seat seal flow passage (401) which runs through the inner side wall and the upper end surface of the lower joint (4), and a one-way valve (5) which is arranged in the seat seal flow passage (401). The expanding packer is suitable for water injection operation.

Description

Expanding packer

Technical Field

The utility model relates to an expanding packer.

Background

Packers are downhole tools that have elastomeric sealing means whereby the annulus between the string and the wellbore and between strings of various sizes is sealed off and the producing zone isolated to control production (injection) fluids and protect the casing. The packer can be divided into a compression packer and an expansion packer according to different expansion modes of the rubber sleeve. Wherein the rubber sleeve of the expanding packer is expanded under the hydraulic action, and the contact area with the inner wall of the shaft is large, so that the packer is more firmly seated.

Referring to fig. 1, a conventional expandable packer is configured to include: top connection 1, the core pipe 2 of being connected with top connection 1, core pipe 2 have slot 203, and the packing element mechanism 3 on core pipe 2 is established to the cover, with the lower clutch 4 that core pipe 2 is connected, packing element mechanism 3 includes: packing element 301, first packing element cover 302, the upper end and the top connection 1 sealing connection of first packing element cover 302, the lower extreme and packing element 301 sealing connection of first packing element cover 302, second packing element cover 303, the upper end and the packing element 301 sealing connection of second packing element cover 303, lower extreme and lower clutch 4 sealing connection. When hydraulic pressure is applied to the expandable packer, the hydraulic pressure enters between the rubber sleeve 301 and the core tube 2 through the slit 203, and the rubber sleeve 301 is expanded, thereby setting the expandable packer to the casing. However, after the hydraulic pressure is stopped, the fluid between the core pipe 2 and the rubber sleeve 301 flows out from the slot 203, the rubber sleeve 301 contracts, and the expandable packer is unlocked, so that the conventional expandable packer can only temporarily seat the pipe string on the well bore, is mostly used for fracturing operation, and is limited to be used in the operation requiring continuous seat of the pipe string, such as water injection operation.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an expanding packer who is suitable for water injection operation. The technical scheme is as follows:

an expandable packer, comprising:

an upper joint is arranged on the upper end of the connecting rod,

a core tube connected with the upper joint,

a rubber cylinder mechanism which is sleeved on the core pipe and is hermetically connected with the upper joint, and

the lower connector is hermetically connected with the core pipe and the rubber cylinder mechanism;

wherein,

the packing element mechanism includes:

a glue cartridge having a first end of the glue cartridge and a second end of the glue cartridge,

a first rubber sleeve hermetically connected with the first end of the rubber sleeve, the first rubber sleeve further hermetically connected with the upper joint, and

the second rubber sleeve is connected with the second end of the rubber sleeve in a sealing mode and is also connected with the lower joint in a sealing mode;

the expandable packer further comprises:

a seat seal flow passage which runs through the inner side wall and the upper end surface of the lower joint,

and the one-way valve is arranged in the seat seal flow passage.

Preferably, the first rubber sleeve comprises:

a first fixing ring sealingly connected to the upper joint, and

with the first fender ring that first solid fixed ring is connected, first fender ring with the first end fixed connection of packing element, first fender ring still with core pipe sealing connection.

More preferably, the core tube comprises:

an inner core tube connected with the upper joint,

an outer core tube connected to the upper joint, an

A first annulus between the inner core tube and the outer core tube,

wherein,

the rubber cylinder mechanism is sleeved on the outer core pipe,

the axial length of the outer core tube is less than the axial length of the inner core tube,

the outer core pipe and the inner core pipe are respectively connected with the inner side wall of the lower joint above the inlet of the seat seal flow passage in a sealing way,

a second annular space is arranged between the inner core tube and the lower joint,

the second annulus is in communication with the seating flow passage.

More preferably, the first rubber sleeve is provided with a first liquid inlet hole,

the outer core pipe is provided with a second liquid inlet hole which is communicated with the first annulus,

the lower connector is provided with a first liquid outlet hole communicated with the first annular space, and the first liquid outlet hole is not communicated with the seat seal flow channel.

More preferably, the packer further comprises:

the sliding sleeves are arranged between the outer core pipe and the first rubber sleeve and slide relative to the outer core pipe and the first rubber sleeve so as to simultaneously block or unblock the first liquid inlet hole and the second liquid inlet hole.

More preferably, a sealing member is arranged in the first annular space, and the sealing member is positioned above the second liquid inlet hole.

More preferably, a third liquid inlet hole is provided on a side wall of the inner core tube above the sealing member,

a fourth liquid inlet hole is arranged on the side wall of the outer core pipe above the sealing part,

the sliding sleeve can block the fourth liquid inlet hole.

More preferably, the first liquid inlet hole, the second liquid inlet hole and the first liquid outlet hole are multiple.

More preferably, the packer further comprises: the first limiting ring is arranged on the upper joint.

More preferably, the lower end of the inner core tube is provided with a second limiting ring matched with the lower joint.

The embodiment of the utility model provides a technical scheme's beneficial effect is: will the utility model discloses the top connection and the tubular column of expanding packer are connected, go into to preset position under the tubular column that will be connected with expanding packer from the well head, from the well head to the tubular column hydraulic pressure of beating again, fluid gets into the inside of expanding packer from the core pipe of expanding packer, and through lining up in the inside wall of lower clutch and the seat seal runner of up end back-up check valve, flow in between core pipe and the packing element, because first packing element cover and the first end and the top connection sealing connection of packing element, and the second packing element cover and the second end and the lower clutch sealing connection of packing element, make the fluid stay between packing element and core pipe, constantly to pouring into fluid between core pipe and the packing element, under the hydraulic action that lasts the increase, radial expansion takes place for the packing element, thereby make the packer seat seal on the pit shaft. Stopping to beat hydraulic pressure in the tubular column, under the promotion of the fluid between packing element and core pipe, the check valve closes for fluid is stayed all the time between packing element and core pipe, and the packing element is in the expansion state all the time, and the seal of expanding packer seat still is on the inner wall of pit shaft. As can be seen, the expandable packer of the present embodiment is suitable for water injection operations, and can still be set in the wellbore when water injection is stopped.

Drawings

FIG. 1 is a schematic view of a conventional expandable packer.

Fig. 2 is a schematic view of a first embodiment of the expandable packer of the present invention, wherein the expandable packer is unset.

Fig. 3 is a schematic view of a second embodiment of the expandable packer of the present invention, wherein the expandable packer is unset.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is an enlarged view at B in fig. 3.

Fig. 6 and 7 are diagrams illustrating the unset state of the expandable packer according to a second embodiment of the present invention, in which fig. 6 illustrates the unset state at a in fig. 3, and fig. 7 illustrates the unset state at B in fig. 3.

The reference numerals in the drawings denote:

1. an upper joint;

2. a core tube;

201. an inner core tube; 2011. a third liquid inlet hole; 2012. a second stop collar;

202. an outer core tube; 2021. a second liquid inlet hole; 2022. a fourth liquid inlet hole; 2023. a third limit ring;

x, a first annulus;

3. a rubber cylinder mechanism;

301. a rubber cylinder; 3011. a first end of the glue cartridge; 3012. a second end of the glue cartridge;

302. a first rubber sleeve; 3021. a first retaining ring; 3022. a first retainer ring; 3023. a first liquid inlet hole;

303. a second rubber sleeve;

4. a lower joint; 401. sealing the flow channel; 4011. seating an inlet of the flow passage; 402. a first liquid outlet hole;

y, a second annulus;

5. a one-way valve;

6. a sealing member;

7. a first limit ring;

8. pin bolt

9. And (4) a sliding sleeve.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the following will describe the embodiments of the present invention in further detail with reference to the accompanying drawings.

First embodiment

The utility model discloses a first embodiment provides an expanding packer. Referring to fig. 2, fig. 2 is a schematic view of an expandable packer according to a first embodiment of the present invention, wherein the expandable packer is in an unset state. As shown in fig. 2, the expandable packer of the first embodiment includes: the device comprises an upper connector 1, a core pipe 2 connected with the upper connector 1, a rubber cylinder mechanism 3 sleeved on the core pipe 2 and hermetically connected with the upper connector 1, and a lower connector 4 hermetically connected with the core pipe 2 and the rubber cylinder mechanism 3; wherein, packing element mechanism 3 includes: the rubber sleeve 301 is provided with a first end 3011 of the rubber sleeve, a second end 3012 of the rubber sleeve, a first rubber sleeve 302 in sealing connection with the first end 3011 of the rubber sleeve, the first rubber sleeve 302 is further in sealing connection with the upper connector 1, a second rubber sleeve 303 in sealing connection with the second end 3012 of the rubber sleeve, and the second rubber sleeve 303 is further in sealing connection with the lower connector 4; a seat seal flow passage 401 penetrating the inner side wall and the upper end face of the lower joint 4, and a check valve 5 disposed in the seat seal flow passage 401.

The utility model discloses the theory of operation of the expanding packer of first embodiment does:

as shown in fig. 2, the upper joint 1 of the expandable packer of the present embodiment is connected to a pipe string, the pipe string connected with the expandable packer is lowered from a wellhead to a predetermined position, hydraulic pressure is applied to the pipe string from the wellhead, fluid enters the interior of the expandable packer from the core tube 2 of the expandable packer, and the check valve 5 is pushed open through the seat seal flow channel 401 penetrating the inner side wall and the upper end surface of the lower joint 4, and flows between the core tube 2 and the packing element 301, because the first packing element sleeve 302 is hermetically connected to the first end 3011 of the packing element and the upper joint 1, and the second packing element sleeve 303 is hermetically connected to the second end 3012 and the lower joint 4 of the packing element, the fluid is retained between the packing element 301 and the core tube 2, the fluid is continuously injected between the core tube 2 and the packing element 301, and the packing element 301 is radially expanded under the action of the continuously increased hydraulic pressure, so that the packer is seated in a wellbore. Stopping pumping hydraulic pressure into the pipe column, under the pushing of the fluid between the rubber sleeve 301 and the core pipe 2, closing the one-way valve 5, so that the fluid is always remained between the rubber sleeve 301 and the core pipe 2, the rubber sleeve 301 is always in an expansion state, and the expansion packer seat seal is still on the inner wall of the shaft. As can be seen, the expandable packer of the present embodiment is suitable for water injection operations, and can still be set in the wellbore when water injection is stopped.

The check valve 5 of the expandable packer according to the present embodiment is configured such that when fluid is injected between the rubber tube 301 and the core tube 2, the check valve 5 is opened, and when the injection of fluid is stopped, the check valve 5 is closed, and the fluid between the rubber tube 301 and the core tube 2 is sealed. For example, the structure of the check valve may adopt a form that a valve seat is matched with a valve ball, and the valve ball may be connected with the valve body through an elastic component (such as a spring) so as to realize automatic resetting of the valve ball. When fluid is injected between the rubber sleeve 301 and the core tube 2, the fluid pushes the valve ball open, the fluid smoothly enters the valve ball, when the fluid injection is stopped, the valve ball is seated on the valve seat under the action of the fluid between the rubber sleeve 301 and the core tube 2, the fluid between the rubber sleeve 301 and the core tube 2 cannot flow out from the seating flow channel 401, the rubber sleeve 301 is always in an expansion state, and therefore the expansion packer is always seated on a well bore.

Referring to fig. 3, fig. 3 is a schematic view of an expandable packer according to a second embodiment of the present invention, wherein the expandable packer is in an unset state. As shown in fig. 3, the first rubber sleeve 302 of the expandable packer of the present embodiment may include: the first fixed ring 3021 is connected with the upper joint 1 in a sealing manner, the first retaining ring 3022 is connected with the first fixed ring 3021, the first retaining ring 3022 is fixedly connected with the first end 3011 of the rubber cylinder, and the first retaining ring 3022 is also connected with the core tube 2 in a sealing manner. The second rubber sleeve 303 of the expandable packer of the present embodiment may include: the second fixing ring 3031 is connected with the lower connector 4 in a sealing mode, the second retaining ring 3032 is connected with the second fixing ring 3031 in a sealing mode, and the second retaining ring 3032 is further fixedly connected with the second end 3012 of the rubber cylinder. So that the packing element 301 forms a sealed space with the core tube 2 and the fluid injected therein does not leak out to maintain the expanded state of the packing element 301, thereby seating the expandable packer on the sidewall of the wellbore.

With continued reference to fig. 3, in this embodiment, the expandable packer may further comprise: a first stop collar 7 arranged on the upper joint 1. When hydraulic pressure is applied, the rubber sleeve 301 is expanded in the radial direction by fluid pressure from below, and meanwhile, an upward pushing effect is generated on the first rubber sleeve 302 in the axial direction, so that the first rubber sleeve 302 slightly moves upwards, and thus, a threat to the joint of the first rubber sleeve 302 and the rubber sleeve 301 is caused, sealing and fixing effects of the first rubber sleeve 302 on the rubber sleeve 301 are likely to be weakened, and even the joint of the first rubber sleeve 302 and the rubber sleeve 301 is separated, so that a seat sealing failure is caused. The first limit ring 7 can prevent the first rubber sleeve 302 from further moving upwards, so that the connection part of the first rubber sleeve 302 and the rubber sleeve 301 is effectively prevented from being separated, and the expandable packer of the embodiment is ensured to be smoothly set on a shaft.

The first rubber sleeve 302 (or the first fixing ring 3021) of the expandable packer according to the present embodiment may be connected to the upper joint 1 by a pin, and when unset, the upper joint 1 is lifted up, the pin fixedly connecting the first rubber sleeve 302 (or the first fixing ring 3021) to the upper joint 1 is cut, the inner core tube 201 and the outer core tube 202 connected to the upper joint 1 are lifted up, the lower end surface of the outer core tube 202 moves up to the upper side of the check valve 5, and the fluid between the rubber sleeve 301 and the outer core tube 202 flows out, the rubber sleeve 301 contracts, and the expandable packer is unset.

Second embodiment

A second embodiment of the present invention provides another expandable packer. Referring to fig. 3, fig. 3 is a schematic view of an expandable packer according to a second embodiment of the present invention, wherein the expandable packer is in an unset state. As shown in fig. 3, the expandable packer of the second embodiment includes: the device comprises an upper connector 1, a core pipe 2 connected with the upper connector 1, a rubber cylinder mechanism 3 sleeved on the core pipe 2 and hermetically connected with the upper connector 1, and a lower connector 4 hermetically connected with the core pipe 2 and the rubber cylinder mechanism 3; wherein, packing element mechanism 3 includes: the rubber sleeve 301 is provided with a first end 3011 of the rubber sleeve, a second end 3012 of the rubber sleeve, a first rubber sleeve 302 in sealing connection with the first end 3011 of the rubber sleeve, the first rubber sleeve 302 is further in sealing connection with the upper connector 1, a second rubber sleeve 303 in sealing connection with the second end 3012 of the rubber sleeve, and the second rubber sleeve 303 is further in sealing connection with the lower connector 4; link up in the seat of the inside wall of lower clutch 4 and up end and seal runner 401, set up check valve 5 in seat runner 401, core pipe 2 includes: the inner core pipe 201 is connected with the upper connector 1, the outer core pipe 202 is connected with the upper connector 1, and a first annular space X is located between the inner core pipe 201 and the outer core pipe 202, wherein the rubber sleeve mechanism 3 is sleeved on the outer core pipe 202, the axial length of the outer core pipe 202 is smaller than that of the inner core pipe 201, the outer core pipe 202 and the inner core pipe 201 are respectively connected with the inner side wall, located above an inlet 4011 of the seat seal flow channel, of the lower connector 4 in a sealing mode, a second annular space Y is arranged between the inner core pipe 202 and the lower connector 4, and the second annular space Y is communicated with the seat seal flow channel 401.

The utility model discloses the theory of operation of second kind of embodiment does:

as shown in fig. 3, the upper joint 1 of the expandable packer of the present embodiment is connected to a pipe string, the pipe string to which the expandable packer is connected is lowered from a wellhead to a predetermined position, hydraulic pressure is applied from the wellhead into the pipe string, fluid is introduced into the interior of the expandable packer from the core tube 2 of the expandable packer, and flows into a seat seal flow channel 401 communicated with the second annular space Y from the second annular space Y, the one-way valve 5 is jacked open by the fluid, the fluid flows into a space between the rubber sleeve 301 and the outer core tube 202, because the first rubber sleeve 302 is hermetically connected with the upper connector 1, the second rubber sleeve 303 is hermetically connected with the lower connector 4, and the outer core tube 202 and the inner core tube 201 are respectively connected with the inner side wall of the lower joint 4 above the inlet 4011 of the seat seal flow passage in a sealing way, so that the fluid is retained between the rubber cylinder 301 and the outer core tube 202, under increasing hydraulic pressure, the packer element 301 expands in a radial direction, thereby setting the expandable packer in the wellbore. Stopping the hydraulic pressure in the pipe string, under the push of the fluid between the rubber sleeve 301 and the outer core tube 202, the one-way valve 5 is closed, so that the fluid is reserved between the rubber sleeve 301 and the outer core tube 202, the rubber sleeve 301 is always in an expansion state, and the expansion packer setting is still on the inner wall of the well bore. As can be seen, the expandable packer of the present embodiment is suitable for water injection operations, and can still be set in the wellbore when water injection is stopped.

Please refer to fig. 3, fig. 4 and fig. 5, wherein fig. 4 is an enlarged view of a point a in fig. 3; fig. 5 is an enlarged view at B in fig. 3. As shown in fig. 3 to 5, in the present embodiment, the first rubber sleeve 302 of the expandable packer has a first liquid inlet hole 3023, the outer core tube 202 has a second liquid inlet hole 2021, the second liquid inlet hole 2021 is communicated with the first annulus X, the lower joint 4 has a first liquid outlet hole 402 communicated with the first annulus X, and the first liquid outlet hole 402 is not communicated with the seat seal flow passage 401. During the backwashing operation, water is injected between the shaft and the pipe column, and flows out of the expansion packer of the embodiment from the first liquid inlet hole 3023, the second liquid inlet hole 2021, the first annular space X and the first liquid outlet hole 402 in sequence, and then returns to the pipe column from the lower joint 4, so that the pipe column is cleaned, and the backwashing operation is realized. Therefore, the expanding packer of the embodiment can well realize the backwashing operation without unsealing.

In this embodiment, there may be a plurality of the first liquid inlet hole 3023, the second liquid inlet hole 2021, and the first liquid outlet hole 402. Further, the plurality of first liquid inlet holes 3023 are uniformly distributed along the radial direction of the first rubber cylinder sleeve 302; the plurality of second liquid inlet holes 2021 are uniformly distributed along the radial direction of the outer core tube 202; the first outlet holes 402 are evenly distributed in the radial direction of the lower joint 4.

In the present embodiment, in addition to the function of flushing the expanded packer, as shown in fig. 3, the expanded packer further includes: and the sliding sleeve 9 is arranged between the outer core pipe 202 and the first rubber sleeve 302 and slides relative to the outer core pipe and the first rubber sleeve to simultaneously seal or unseal the first liquid inlet hole 3023 and the second liquid inlet hole 2021. When no backwashing well operation is needed, the sliding sleeve 9 closes a backwashing well channel formed by the first liquid inlet hole 3023, the second liquid inlet hole 2021, the first annular space X, the first liquid outlet hole 402 and the like. During the backwashing operation, the sliding sleeve 9 slides upwards under the pressure of water between the pipe column and the well bore, and the water flows into the first annulus X from the first liquid inlet hole 3023 and the second liquid inlet hole 2021, so that the above-mentioned backwashing operation is realized.

Referring to fig. 4, the outer core tube 202 has a third limiting ring 2023 against which the upper end surface of the sliding sleeve 9 abuts, when the well is backflushed, water injected from between the tubular column and the well bore enters from the first liquid inlet hole 3023, and then the sliding sleeve 9 is pushed to slide upward, and when the sliding sleeve 9 slides until the upper end surface of the sliding sleeve abuts against the lower end surface of the third limiting ring 2023, the sliding sleeve 9 stops sliding upward, so that the third limiting ring 2023 can control the distance of the sliding sleeve 9 sliding upward.

As shown in fig. 4, the expandable packer of the present embodiment further includes a seal member 6 provided in the first annulus X, and the seal member 6 is located above the second fluid intake hole 2021. On the basis, a third liquid inlet 2011 is provided on the side wall of the inner core tube 201 above the sealing member 6, and a fourth liquid inlet 2022 is provided on the side wall of the outer core tube 202 above the sealing member 6. The seal member 6 prevents the first annulus X from communicating with the third inlet 2011 and the fourth inlet 2022. When hydraulic pressure is applied to the pipe string from the wellhead, a fluid flows into the inner core tube 201 of the expandable packer of the present embodiment, a part of the fluid flows into the setting channel 401, and a small part of the fluid flows into the space between the first rubber sleeve 302 (or the first fixing ring 3021) and the outer core tube 202 from the third fluid inlet 2011 and the fourth fluid inlet 2022, so as to generate a downward thrust on the sliding sleeve 9, and the sliding sleeve 9 generates a downward thrust on the rubber sleeve 301, so as to balance the upward thrust on the rubber sleeve 301 generated by the fluid flowing into the space between the outer core tube 202 and the rubber sleeve 301, thereby preventing the rubber sleeve 301 from being radially expanded, pushing the first rubber sleeve 302 to move upward, and affecting the setting effect of the expandable packer.

As shown in fig. 4, the fourth liquid inlet hole 2022 is located below the third limiting ring 2023, and preferably, the fourth liquid inlet hole 2022 is located adjacent to the third limiting ring 2023, so that the sliding sleeve 9 does not block the fourth liquid inlet hole 2022, so that when a hydraulic pressure is applied, a fluid can flow into between the first rubber sleeve 302 (or the first fixing ring 3021) and the outer core 202 through the third liquid inlet hole 2011 and the fourth liquid inlet hole 2022, push the sliding sleeve 9 to slide downward, and block the first liquid inlet hole 3023, so that the fluid cannot leak out from the first liquid inlet hole 3023, thereby smoothly completing the seating work.

It can be understood by those skilled in the art that the sealing member 6 in the present embodiment may be an integral structure with the inner core tube 201, and the sealing member 6 may be an annular protrusion of the inner core tube 201, and is sealed with the outer core tube 202 above the first annulus X; alternatively, the sealing member 6 may be an annular projection of the outer core tube 202 that seals with the inner core tube 201 above the first annulus X.

In this embodiment, please refer to fig. 6 and 7, fig. 6 and 7 are diagrams illustrating the unset state of the expandable packer according to a second embodiment of the present invention, wherein fig. 6 illustrates the unset state at a in fig. 3, and fig. 7 illustrates the unset state at B in fig. 3. As shown in fig. 6 and 7, the first rubber sleeve 302 can be fixedly connected with the upper joint 1 in a sealing manner by a pin 8, and the lower end of the inner core tube 201 is provided with a second limiting ring 2012 matched with the lower joint 4. When the packer is unpacked, the upper joint 1 is lifted, the pin 8 fixedly connecting the first rubber sleeve 302 with the upper joint 1 is sheared, the inner core tube 201 and the outer core tube 202 connected with the upper joint 1 rise along with the pin, the outer core tube 202 is not hermetically connected with the lower joint 4, fluid between the outer core tube 202 and the rubber sleeve 301 flows out from a gap between the outer core tube 202 and the lower joint 4, the rubber sleeve 301 contracts and continues to move upwards until the lower end face of the outer core tube 4 is located above the one-way valve 5, the inner core tube 201 moves upwards to the second limiting ring 2012 to be abutted against the lower joint 4, the outflow speed of the fluid is accelerated, and finally the expanding packer is unpacked. The inner core pipe 201 moves upwards to the second limiting ring 2012 to abut against the lower joint 4, and the upper joint 1 does not move upwards relative to the glue cylinder mechanism 3 any more, so that the upper joint 1 and the core pipe 2 are prevented from being separated from the glue cylinder mechanism 3.

The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An expandable packer, comprising:

an upper joint (1) is arranged on the upper joint,

a core tube (2) connected with the upper joint (1),

a rubber cylinder mechanism (3) which is sleeved on the core pipe (2) and is hermetically connected with the upper joint (1), and

the lower joint (4) is connected with the core pipe (2) and the rubber cylinder mechanism (3) in a sealing way;

wherein,

the glue cylinder mechanism (3) comprises:

a glue cartridge (301), the glue cartridge (301) having a first end (3011) of the glue cartridge and a second end (3012) of the glue cartridge,

a first rubber sleeve (302) connected with the first end (3011) of the rubber sleeve in a sealing way, wherein the first rubber sleeve (302) is also connected with the upper joint (1) in a sealing way, and

the second rubber sleeve (303) is connected with the second end (3012) of the rubber sleeve in a sealing mode, and the second rubber sleeve (303) is further connected with the lower connector (4) in a sealing mode;

it is characterized in that the preparation method is characterized in that,

the expandable packer further comprises:

a seat seal flow passage (401) which runs through the inner side wall and the upper end surface of the lower joint (4),

and the check valve (5) is arranged in the seat seal flow passage (401).

2. The expandable packer of claim 1, wherein the first rubber sleeve (302) comprises:

a first fixing ring (3021) sealingly connected to the upper joint (1), and

the first retaining ring (3022) is connected with the first fixing ring (3021), the first retaining ring (3022) is fixedly connected with the first end (3011) of the rubber cylinder, and the first retaining ring (3022) is further connected with the core tube (2) in a sealing manner.

3. The expandable packer of claim 1 or 2,

the core tube (2) comprises:

an inner core tube (201) connected with the upper joint (1),

an outer core tube (202) connected to the upper joint (1), and

a first annulus (X) between the inner core tube (201) and the outer core tube (202),

wherein,

the rubber cylinder mechanism (3) is sleeved on the outer core pipe (202),

the axial length of the outer core tube (202) is smaller than the axial length of the inner core tube (201),

the outer core pipe (202) and the inner core pipe (201) are respectively connected with the inner side wall of the lower joint (4) above the inlet (4011) of the seat seal flow passage in a sealing way,

a second annular space (Y) is arranged between the inner core tube (202) and the lower joint (4),

the second annulus (Y) is in communication with the seating flow passage (401).

4. The expandable packer of claim 3,

the first rubber cylinder sleeve (302) is provided with a first liquid inlet hole (3023),

the outer core tube (202) is provided with a second liquid inlet hole (2021), the second liquid inlet hole (2021) is communicated with the first annular space (X),

the lower connector (4) is provided with a first liquid outlet hole (402) communicated with the first annular space (X), and the first liquid outlet hole (402) is not communicated with the seat sealing flow passage (401).

5. The expandable packer of claim 4, further comprising:

the sliding sleeve (9) is arranged between the outer core pipe (202) and the first rubber sleeve (302) and slides relative to the outer core pipe (202) and the first rubber sleeve (302) to simultaneously seal or unseal the first liquid inlet hole (3023) and the second liquid inlet hole (2021).

6. An expandable packer according to claim 4, characterised in that a sealing member (6) is arranged in the first annulus (X), which sealing member (6) is located above the second inlet opening (2021).

7. The expandable packer according to claim 4, wherein the first inlet port (3023), the second inlet port (2021), and the first outlet port (402) are plural.

8. The expandable packer of claim 5,

a third liquid inlet hole (2011) is arranged on the side wall of the inner core pipe (201) above the sealing component (6),

a fourth liquid inlet hole (2022) is arranged on the side wall of the outer core tube (202) above the sealing component (6),

the sliding sleeve (9) can block the fourth liquid inlet hole (2022).

9. The expandable packer of claim 1, further comprising: a first limit ring (7) arranged on the upper joint (1).

10. An expandable packer according to claim 3, characterised in that the lower end of the inner core tube (201) is provided with a second stop collar (2012) cooperating with the lower sub (4).