CN217760930U - Multifunctional swelling type washable well high-pressure water injection packer - Google Patents

Abstract

The utility model discloses a multi-functional swelling formula washable well high pressure water injection packer, including interior center tube, feed liquor hole A and feed liquor hole B have been seted up to interior center tube bottom, interior center tube outside cover is equipped with outer center tube, interior center tube lateral wall top threaded connection has connecting portion, go up connecting portion, be equipped with the elasticity portion between the interior center tube, outer center tube lateral wall middle part cover is equipped with inflation portion, elasticity portion bottom and inflation portion top butt, outer center tube lateral wall middle part slip cover is equipped with the adjusting ring, adjusting ring top and inflation portion bottom butt, the adjusting ring bottom is equipped with rightting portion, righting portion bottom threaded connection has connecting portion down, connecting portion outside threaded connection has joint portion down. The utility model has the characteristics of simple structure, multiple functions, reliable performance, wide application range and no operation; the preparation time in the early stage of water injection can be greatly shortened, the operation flow is simplified, the labor intensity is reduced, and the operation cost is reduced.

Description

Multifunctional swelling type washable well high-pressure water injection packer

Technical Field

The utility model belongs to the technical field of oil gas field instrument in the pit, especially, relate to a multi-functional swelling formula washable well high pressure water injection packer.

Background

The layered water injection process of the oil-water well is one of powerful measures for increasing the yield and the efficiency of an oil field, and has irreplaceable effects on increasing the formation pressure of the oil well and improving the productivity of an oil deposit. The separate layer packing tool, namely the water injection packer, is an indispensable ring, and the performance of the separate layer packing tool, namely the water injection packer, directly determines the success or failure of the separate layer water injection process. The water injection packer commonly used at present has the following defects: the pressure bearing capacity is low, and the requirement of high water injection pressure fluctuation cannot be met; before the water injection operation is implemented, the seat sealing needs to be applied, and then the pressure is removed, and then the water injection operation can be implemented, so that the process operation is complex and the operation time is long; the seat seal locking structure mostly adopts a clamping tooth-pin locking type, and has the advantages of complex structure, lower pressure bearing capacity, easy self-unsealing and poorer reliability; the long-time seat sealing makes the relative sliding parts easy to generate sand blocking and scale blocking, which causes difficulty in unsealing; the well casing has no righting function, and has poor sealing performance for casing change wells, inclined wells and horizontal wells; when deblocking, the deblocking pin is sheared by means of blocking of the casing coupling and increasing the lifting force of the operation machine, so that the deblocking purpose is achieved, the power output of the operation machine is increased, and the operation cost is increased; and the rubber cylinder is easy to damage, so that underground falling objects are caused, and underground potential safety hazards are generated. Therefore, a multifunctional swelling type washable well high-pressure water injection packer needs to be designed to solve the problems existing in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a multi-functional swelling formula washable well high pressure water injection packer to solve above-mentioned problem, reach the purpose that improves the work effect of water injection packer.

In order to achieve the above purpose, the utility model provides a following scheme: the utility model provides a multi-functional swelling formula high pressure water injection packer that can wash well, includes interior center tube, feed liquor hole A and feed liquor hole B have been seted up to interior center tube bottom, interior center tube outside cover is equipped with outer center tube, interior center tube lateral wall top threaded connection has connecting portion, it is equipped with the elasticity portion to go up between connecting portion, the interior center tube, outer center tube lateral wall middle part cover is equipped with inflation portion, elasticity portion bottom with inflation portion top butt, outer center tube lateral wall middle part sliding sleeve is equipped with the adjustment ring, the adjustment ring top with inflation portion bottom butt, the adjustment ring bottom is equipped with positive portion, right a portion bottom threaded connection has lower connecting portion, connecting portion outside threaded connection has joint portion down.

Preferably, go up connecting portion including protecting a section of thick bamboo, go up protect a section of thick bamboo with interior center tube lateral wall top threaded connection, go up protect a section of thick bamboo inside wall top threaded connection has the top connection, the top connection inside wall with interior center tube lateral wall threaded connection, go up protect a section of thick bamboo with reserve between the interior center tube has the interval, the elasticity portion is established it protects between a section of thick bamboo, the interior center tube to go up.

Preferably, the elastic part includes the carrier, the carrier lateral wall with go up and protect a section of thick bamboo inside wall threaded connection, the carrier cover is established the interior center tube outside, the carrier below is equipped with the well-flushing valve, be equipped with the spring between carrier, the well-flushing valve, the spring housing is established the interior center tube outside, the well-flushing valve slides and sets up go up and protect inside the section of thick bamboo.

Preferably, the top of the outer side wall of the outer central tube is in threaded connection with a pushing body, the top end of the pushing body is abutted to the bottom end of the well washing valve, and the bottom end of the pushing body is abutted to the top end of the expansion part.

Preferably, the expansion part comprises a middle rubber cylinder, the middle rubber cylinder is slidably sleeved outside the outer central tube, the upper end and the lower end of the middle rubber cylinder are respectively abutted with a spacer ring, one side of the spacer ring, away from the middle rubber cylinder, is abutted with an outer rubber cylinder, the outer rubber cylinder and the spacer ring are both in sliding connection with the outer side of the outer central tube, the outer rubber cylinder is abutted with the bottom end of the pushing body and is positioned above, and the outer rubber cylinder is abutted with the adjusting ring and is positioned below.

Preferably, the righting portion comprises a righting ring, the righting ring is in sliding connection with the outer side wall of the inner central tube, the top of the outer side wall of the righting ring is in threaded connection with the inner side wall of the adjusting ring, the bottom of the outer side wall of the righting ring is in threaded connection with the top end of the lower connecting portion, a plurality of righting balls are embedded into the top of the righting ring, and the plurality of righting balls are evenly arranged along the circumferential direction of the side wall of the righting ring.

Preferably, the lower connecting portion comprises a lower protective sleeve, the upper portion of the inner side wall of the lower protective sleeve is in threaded connection with the lower portion of the outer side wall of the righting ring, the lower portion of the inner side wall of the lower protective sleeve is in threaded connection with a lower connector, the inner side wall of the lower connector is in threaded connection with the inner central pipe, and the clamping portion is in threaded connection with the outer side wall of the lower protective sleeve.

Preferably, joint portion includes the soluble snap ring, soluble snap ring inside wall with lower clutch lateral wall butt, soluble snap ring top with protect a section of thick bamboo bottom butt down, soluble snap ring outside cover is equipped with the lock mother, the lock mother with protect a section of thick bamboo lateral wall threaded connection down.

The utility model discloses has following technological effect:

the utility model discloses a lower connecting portion can provide two hydraulic pressure cavity structures, and the reunion tubular column natural pressure can form multiple pressure boost, has higher packing performance, and joint portion can automatic swelling release, and the vacuum cavity that lower connecting portion and inner center tube formed combines the inflation portion can remove the automatic deblocking of pressure resilience, simultaneously can sand control card, dirt card.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic view of the start of the operation of the present invention;

FIG. 3 is a schematic view of the clip portion after being unsealed;

figure 4 is the well-flushing process schematic diagram of the present invention.

Wherein, 1, an upper joint; 2. an upper protective cylinder; 3. a carrier; 4. a spring; 5. a well flushing valve; 6. a pushing body; 7. an outer rubber cylinder; 8. a spacer ring; 9. a middle rubber cylinder; 10. an outer center tube; 11. an inner center tube; 12. an adjustment ring; 13. righting the ball; 14. a righting ring; 15. a seal ring; 16. a piston; 17. a lower protective cylinder; 18. a soluble snap ring; 19. locking a nut; 20. a lower joint; 21. a limiting table; 22. a liquid inlet hole A; 23. a hydraulic chamber A; 24. a vacuum chamber; 25. a liquid inlet hole B; 26. a hydraulic chamber B; 27. washing the well hole C; 28. righting the boss; 29. a well flushing channel; 30. washing the well hole B; 31. washing the well hole A; 32. a sleeve; 33. a casing collar.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the following detailed description.

Referring to fig. 1-4, the utility model discloses a multi-functional swelling formula washable well high pressure water injection packer, including inner center tube 11, feed liquor hole A22 and feed liquor hole B25 have been seted up to inner center tube 11 bottom, inner center tube 11 outside cover is equipped with outer center tube 10, 11 lateral wall top threaded connection of inner center tube has last connecting portion, go up connecting portion, be equipped with the elasticity portion between the inner center tube 11, outer center tube 10 lateral wall middle part cover is equipped with the inflation portion, elasticity portion bottom and inflation portion top butt, outer center tube 10 lateral wall middle part slip cover is equipped with adjusting ring 12, adjusting ring 12 top and inflation portion bottom butt, adjusting ring 12 bottom is equipped with righting portion, connecting portion under righting portion bottom threaded connection, connecting portion outside threaded connection has joint portion down.

Further, a well washing channel 29 is formed between the outer central tube 10 and the inner central tube 11, a righting boss 28 is arranged in the middle of the outer side wall of the inner central tube 11, and the righting boss 28 is located below the bottom end of the outer central tube 10.

Connecting portion can provide two hydraulic pressure cavity structures down, and the reunion tubular column natural pressure can form multiple pressure boost, has higher packing performance, and joint portion can automatic swelling release, and the vacuum cavity that lower connecting portion and interior center tube 11 formed combines the inflation portion can remove the automatic deblocking of pressure kick-back, can sand control card, dirt card simultaneously.

Further optimize the scheme, go up connecting portion and include that protecting a section of thick bamboo 2, go up and protect a section of thick bamboo 2 and 11 lateral wall top threaded connection of interior center tube, go up and protect 2 inside wall top threaded connection of a section of thick bamboo and have top connection 1, top connection 1 inside wall and 11 lateral wall threaded connection of interior center tube, go up and protect to have the interval between a section of thick bamboo 2 and the interior center tube 11 of reserving, the elastic component is established at last and is protected between a section of thick bamboo 2, the interior center tube 11.

Further optimize the scheme, the elastic part includes carrier 3, 3 lateral walls of carrier and 2 inside wall threaded connection of last casing, 11 outsides of center tube including carrier 3 cover is established, 3 below carrier are equipped with well-flushing valve 5, are equipped with spring 4 between carrier 3, the well-flushing valve 5, and 4 covers in the center tube 11 outsides of establishing, well-flushing valve 5 slides and sets up in last casing 2 insides.

Further optimize the scheme, outer center tube 10 lateral wall top threaded connection has the pushing body 6, pushes away 6 tops and 5 bottom butts of well-flushing valve, pushes away 6 bottoms and inflation portion top butt of body.

Further optimize the scheme, the inflation portion includes well packing element 9, and well packing element 9 slip cap is established in the outer center tube 10 outside, and both ends do not the butt have a spacer ring 8 about well packing element 9, and one side butt that well packing element 9 was kept away from to spacer ring 8 has outer packing element 7, and outer packing element 7, spacer ring 8 all with outer center tube 10 outside sliding connection, the outer packing element 7 that is located the top and the 6 bottom butt of pushing away the body, the outer packing element 7 and the adjusting ring 12 butt that are located the below.

Further optimization scheme, the portion of righting is including righting ring 14, and righting ring 14 and 11 lateral walls sliding connection of inner tube, and the top of the lateral wall of righting ring 14 and the inside wall threaded connection of adjusting ring 12, the bottom of the lateral wall of righting ring 14 and lower connecting portion top threaded connection, and a plurality of balls 13 of righting are inlayed at righting ring 14 top, and a plurality of balls 13 of righting evenly set up along righting ring 14 lateral wall circumference.

Further, a well washing hole C27 is formed in the righting ring 14, a well washing hole A31 is formed in the bottom end of the upper casing 2, a well washing hole B30 is formed by the outer central pipe 10 and the bottom end of the upper casing 2, the well washing hole B30 and the well washing hole A31 are separated through a well washing valve 5, and the well washing hole B30 and the well washing hole A31 are communicated with the well washing hole C27 through a well washing channel 29.

Further optimize the scheme, lower connecting portion protect a 17 inside wall upper portion and right ring 14 lateral wall lower part threaded connection including protecting a 17 down, protect a 17 inside wall lower part threaded connection down and have lower clutch 20, lower clutch 20 inside wall and interior center tube 11 threaded connection, joint portion and protect a 17 lateral wall threaded connection down.

Further, the outer side wall of the inner central tube 11 is in threaded connection with a piston 16, the top end of the piston 16 is abutted to the bottom end of the centralizing ring 14, and the outer side wall of the piston 16 is in sliding contact with the inner side wall of the lower casing 17.

Further optimize the scheme, joint portion includes soluble snap ring 18, and 18 inside walls of soluble snap ring and 20 lateral walls butts of lower clutch, and the top of soluble snap ring 18 and the 17 bottom butts of protecting down section of thick bamboo, the 18 outside cover of soluble snap ring are equipped with the lock mother 19, lock mother 19 and the 17 lateral walls threaded connection of protecting down section of thick bamboo.

The upper part of the outer side wall of the lower joint 20 is provided with a limiting table 21, and the limiting table 21 clamps the soluble snap ring 18. The soluble snap ring 18 mainly comprises magnesium element and aluminum element, and also comprises other trace elements such as copper, manganese, iron, sodium, gallium, indium and the like.

Furthermore, each threaded connection is provided with a sealing ring 15, so that the sealing effect is improved.

Further, feed liquor hole A22 and feed liquor hole B25 have been seted up to the bottom of interior center tube 11, feed liquor hole A22 is located feed liquor hole B25's below, the inside wall top of lower clutch 20 sets up to the inclined plane, protect down and form hydraulic pressure chamber A23 between section of thick bamboo 17, the 11 lateral wall three of interior center tube, hydraulic pressure chamber A23 and feed liquor hole A22 intercommunication, it forms hydraulic pressure chamber B26 to right between ring 14 bottom, the 16 top of piston, the 11 lateral wall three of interior center tube, hydraulic pressure chamber B26 and feed liquor hole B25 intercommunication.

Furthermore, a vacuum cavity 24 is formed among the bottom end of the piston 16, the lower protective cylinder 17 and the outer side wall of the inner central tube 11.

The working process of the embodiment is as follows:

will the utility model discloses go down to predetermined aspect in the pit after connecting according to water injection technology tubular column requirement, natural liquid column gets into hydraulic chamber A23 and hydraulic chamber B26 through feed liquor hole A22 and feed liquor hole B25 in the tubular column, form natural pressure, through protecting section of thick bamboo 17, piston 16, right ring 14 and adjusting ring 12 to produce the compression trend to the inflation portion down, because the blocking effect of lock nut 19, soluble snap ring 18 and spacing platform 21, above-mentioned compression trend can't constitute the actual compression swell to the inflation portion and seal the result, soluble snap ring 18 begins to dissolve simultaneously; after a certain time, the water injection pipe column is lowered, the connection of the ground water injection manifold is completed, the soluble snap ring 18 is dissolved, the blocking effect of the locking nut 19, the soluble snap ring 18 and the limiting table 21 disappears, and the natural pressure in the pipe column pushes the lower protective cylinder 17, the piston 16, the centering ring 14 and the adjusting ring 12 to generate preliminary compression on the expansion part, so that the automatic swelling and releasing function is realized. After the water injection operation is started, liquid with pressure enters the hydraulic cavity A23 and the hydraulic cavity B26 through the liquid inlet hole A22 and the liquid inlet hole B25, double pressures are generated by the double hydraulic cavities at the moment, triple composite pressures are formed by the double hydraulic cavities and the previous natural pressure, the expansion part is further compressed, the expansion part is completely expanded and sealed, the product achieves the multiple pressurization expansion sealing function, and the sealing effect on the related layer position is achieved at the moment. Meanwhile, the righting ball 13 moves upwards to the righting boss 28 under the driving of the righting ring 14 and protrudes outwards to contact with the casing 32, so that the function of automatically righting the pipe column is realized. Meanwhile, liquid with pressure enters a corresponding layer to be injected through a relevant jet tool of the tubular column to realize a water injection task; after the water injection operation is finished, pressure is removed, the pressure of the double hydraulic cavities disappears, only single natural pressure generated by a liquid column in the residual pipe is left, the pressure state of the expansion part is obviously weakened, and due to the elastic air bag effect of the vacuum cavity 24, the ascending parts such as the adjusting ring 12 and the righting ring 14 are forced to descend together to return to the original state, so that the expansion part retracts radially and extends axially, the semi-expansion state before the water injection pressure is restored, the righting ball 13 retracts, the expansion sealing and righting states are released, and the automatic pressure removing function is realized. Because the shape reaches the full expansion sealing state only in the water injection operation time period, and the normal state is recovered by self-unsealing after pressure is removed, the exposure time of the related sliding parts is short, and the phenomena of sand blocking and scale blocking caused by mud sand and scale pieces are not easy to enter, so that a clean local space is kept during the next water injection operation, and the functions of preventing the sand blocking and the scale blocking are realized.

During well washing operation, well washing liquid passes through the well washing hole A31 of the uppermost packer, overcomes the resistance of the spring 4, pushes the well washing valve 5 open, is communicated with the well washing hole B30, is discharged from the well washing hole C27 through the well washing channel 29, bypasses the expansion part in a semi-expansion state, and completes the reverse well washing task of the surface layer section of the expansion part; and meanwhile, the well washing liquid enters the next-stage packer according to the flow, and the like, so that the function of simultaneously backwashing the multiple stages of packers is realized.

When lifting up, the packer is in a semi-expansion state, and the expansion part and the inner wall of the casing 32 do not have a retardation effect, so that the pipe column is directly lifted up and taken out of the well.

Any two adjacent casings 32 are fixedly connected by a casing collar 33.

The utility model discloses there is following technical characterstic:

1. the double-hydraulic-cavity structure is adopted, triple composite pressure is formed by virtue of the natural pressure and the water injection pressure of the pipe column, the generated pressure is greatly higher than the pressure generated by a single pressure cavity and a single hydraulic source of a common packer, the multiple pressurization and expansion sealing functions are realized, the sealing performance is more reliable, and the problems that the pressure bearing capacity of the common packer is lower and the requirement of higher water injection pressure fluctuation cannot be met are solved.

2. Because can produce triple composite pressure automatically to have automatic swelling release function, so need not other additional operations and can realize the function of instant water injection, instant seat sealing, solved the problem that the water injection operation earlier stage of present commonly used packer is operated more complicacy, the activity duration is long.

3. Because rely on water injection pressure to realize the complete swell-seal to utilize the elasticity answer effect of inflation portion, so make the instrument have the function of withdrawing pressure resilience, automatic deblocking, solved present packer locking structure commonly used complicacy, the bearing capacity is lower, easily deblocking by oneself, the relatively poor problem of reliability.

4. Because of the characteristics of water injection seat sealing and pressure releasing, the related sliding parts are short in exposure time and are not easy to enter mud sand and scale sheets to cause the phenomena of sand blocking and scale blocking, clean local space is kept for next water injection operation, and the problem that the common packer is easy to generate the sand blocking and the scale blocking to cause difficulty in releasing is solved.

5. Because the packer is provided with the centralizing ball 13, the centralizing ring 14 and other related linkage mechanisms, the packer has the automatic centralizing functions of setting centralizing and deblocking returning on a pipe column, and the problems that the conventional common packer has no centralizing function and has poor sealing performance on a casing change well, an inclined well and a horizontal well are solved.

6. Because the packer is in a half-expansion deblocking state when pressure is removed and injection is stopped, and no blocking action exists between the packer and the inner wall of the casing 32, the operation of a pipe string is not influenced completely, the problem that the power output of the operation machine needs to be increased in the pipe-pulling operation of the common packer at present is solved, and the operation cost is increased; and the rubber cylinder is easy to damage, so that the underground falling object is caused, and the underground potential safety hazard is caused.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims (8)

1. The utility model provides a multi-functional swelling formula washable well high pressure water injection packer, a serial communication port, including inner tube (11), feed liquor hole A (22) and feed liquor hole B (25) have been seted up to inner tube (11) bottom, inner tube (11) outside cover is equipped with outer center tube (10), inner tube (11) lateral wall top threaded connection has last connecting portion, go up and be equipped with elasticity portion between connecting portion, inner tube (11), outer center tube (10) lateral wall middle part cover is equipped with inflation portion, elasticity portion bottom with inflation portion top butt, outer center tube (10) lateral wall middle part sliding sleeve is equipped with adjustment ring (12), adjustment ring (12) top with inflation portion bottom butt, adjustment ring (12) bottom is equipped with righting portion, righting portion bottom threaded connection has lower connecting portion, connecting portion outside threaded connection has joint portion down.

2. The packer of claim 1, wherein the upper connection portion comprises an upper casing (2), the upper casing (2) is in threaded connection with the top of the outer side wall of the inner central tube (11), the top of the inner side wall of the upper casing (2) is in threaded connection with an upper joint (1), the inner side wall of the upper joint (1) is in threaded connection with the outer side wall of the inner central tube (11), a gap is reserved between the upper casing (2) and the inner central tube (11), and the elastic portion is arranged between the upper casing (2) and the inner central tube (11).

3. The packer of claim 2, wherein the elastic part comprises a carrier (3), the outer side wall of the carrier (3) is in threaded connection with the inner side wall of the upper casing (2), the carrier (3) is sleeved on the outer side of the inner central tube (11), a well washing valve (5) is arranged below the carrier (3), a spring (4) is arranged between the carrier (3) and the well washing valve (5), the spring (4) is sleeved on the outer side of the inner central tube (11), and the well washing valve (5) is slidably arranged inside the upper casing (2).

4. The multifunctional swelling type washable well high-pressure water injection packer as claimed in claim 3, characterized in that the top of the outer side wall of the outer central tube (10) is in threaded connection with a push body (6), the top end of the push body (6) is abutted with the bottom end of the well washing valve (5), and the bottom end of the push body (6) is abutted with the top end of the swelling part.

5. The multifunctional swelling-type washable well high-pressure water injection packer as claimed in claim 4, wherein the swelling part comprises a middle rubber cylinder (9), the middle rubber cylinder (9) is slidably sleeved on the outer side of the outer central pipe (10), spacer rings (8) are respectively abutted to the upper end and the lower end of the middle rubber cylinder (9), an outer rubber cylinder (7) is abutted to one side, away from the middle rubber cylinder (9), of the spacer ring (8), the outer rubber cylinder (7) and the spacer ring (8) are both slidably connected with the outer side of the outer central pipe (10), the outer rubber cylinder (7) above is abutted to the bottom end of the push body (6), and the outer rubber cylinder (7) below is abutted to the adjusting ring (12).

6. The multifunctional swelling type washable well high-pressure water injection packer as claimed in claim 1, wherein the centralizing part comprises a centralizing ring (14), the centralizing ring (14) is slidably connected with the outer side wall of the inner central tube (11), the top of the outer side wall of the centralizing ring (14) is in threaded connection with the inner side wall of the adjusting ring (12), the bottom of the outer side wall of the centralizing ring (14) is in threaded connection with the top end of the lower connecting part, a plurality of centralizing balls (13) are embedded in the top of the centralizing ring (14), and a plurality of centralizing balls (13) are uniformly arranged along the circumferential direction of the side wall of the centralizing ring (14).

7. The multifunctional swelling type washable well high-pressure water injection packer as claimed in claim 6, wherein the lower connecting portion comprises a lower casing (17), the upper portion of the inner side wall of the lower casing (17) is in threaded connection with the lower portion of the outer side wall of the centralizing ring (14), the lower portion of the inner side wall of the lower casing (17) is in threaded connection with a lower joint (20), the inner side wall of the lower joint (20) is in threaded connection with the inner central pipe (11), and the clamping portion is in threaded connection with the outer side wall of the lower casing (17).

8. The multifunctional swelling type washable well high-pressure water injection packer as claimed in claim 7, wherein said clamping portion comprises a soluble snap ring (18), the inner side wall of said soluble snap ring (18) is abutted against the outer side wall of said lower joint (20), the top end of said soluble snap ring (18) is abutted against the bottom end of said lower casing (17), a locking nut (19) is sleeved on the outer side of said soluble snap ring (18), and said locking nut (19) is in threaded connection with the outer side wall of said lower casing (17).

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