CN117449797A - Unpackable packing device, lifting unpacking tool and application - Google Patents

Abstract

The invention provides a seal-removable type packing device, a lifting seal-removable tool and an application, wherein the packing device comprises a suspension packer, the suspension packer comprises a setting driving unit, a tieback unit, a slip rubber unit and a seal-removable unit which are sequentially connected, the slip rubber unit comprises a central tube, a setting assembly, slips, a setting assembly and a rubber unit, the seal-removable unit comprises a connecting sleeve, a first seal-removable elastic claw, a seal-removable sleeve, a lower joint and a seal-removable shear pin, and the lower end of the seal-removable sleeve is arranged in the lower joint in a penetrating manner and is connected with the lower joint through the seal-removable shear pin; the setting driving unit can drive the setting assembly and the setting assembly to respectively push the slips and the rubber cylinder group to be opened along the radial direction so as to realize setting and setting; the lifting type deblocking tool can be put into the hanging packer to lift upwards to shear deblocking shear pins, and drives the slips and the rubber cylinder group to shrink so as to realize deblocking. Compared with the existing ball throwing deblocking, the lifting deblocking tool is added, and is more beneficial to improving the operation capability of the sectional yield improvement of the horizontal well completion.

Description

Unpackable packing device, lifting unpacking tool and application

Technical Field

The invention relates to the technical field of downhole tools for petroleum drilling and production, in particular to a sealing device capable of being unsealed, a lifting type unsealing tool and application.

Background

At present, when the sectional yield improvement of the well completion of the horizontal well is implemented, a yield improvement tool is put into a horizontal section, a suspension packer is put into a vertical well or a well section with smaller inclination by a drill rod, after the suspension packer hangs a horizontal section tool pipe column on a sleeve, the drill rod is separated from the suspension packer, and then a lower oil pipe tie-back tool pipe column is inserted into a tie-back sealing cylinder on the suspension packer for pipe column tie-back. The existing hanging packer (Chinese patent: split slip hanging packer, patent number: ZL 201010216240.7) plays a role of hanging and top packing in a horizontal well open hole segmentation tool, and can only be used for fracturing and acidizing construction, wherein the working temperature is 170 ℃ and the working pressure difference is 70MPa; the suspension completion integrated packer (Chinese patent: suspension completion integrated packer and completion pipe string, patent number: ZL 202110810796.7) which is iteratively upgraded simplifies the open hole sectional completion pipe string, integrates suspension and completion functions, has the working temperature of 200 ℃ and the working pressure difference of 70MPa, and the two suspension packers developed by the inventor can not meet the open hole sectional requirements of the existing blocks with the working temperature of 200 ℃ and the working pressure difference of 105 MPa. The existing hanging packer mainly has the following technical defects:

1. The existing hanging packer rubber combination material is single in selection, simple in structure combination and limited in pressure bearing capacity.

2. The existing hanging packer deblocking mechanism is poor in reliability, and an emergency deblocking technology needs to be improved.

Disclosure of Invention

The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the purposes of the present invention is to provide a sealing device capable of being unsealed, a lifting type unsealing tool and an application thereof, which can be used for solving the technical problems of single material selection, simple structure combination, limited pressure bearing capacity, poor reliability of the unsealing mechanism and the like of the combination materials of the suspended packer rubber in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a packing device capable of being unpacked, the packing device may include a hanging packer, the hanging packer includes a setting driving unit, a tie-back unit, a slip packing unit and an unpacking unit connected in sequence, wherein the setting driving unit includes a first outer layer mechanism and a first inner layer mechanism, the first outer layer mechanism is sleeved outside the first inner layer mechanism, and a gap is formed between the first outer layer mechanism and the first inner layer mechanism; the first inner layer mechanism comprises an upper joint, a setting middle joint, a setting central pipe and a setting ball seat, wherein the upper joint, the setting middle joint and the setting central pipe are sequentially connected, and the setting ball seat is arranged in the inner cavity of the setting central pipe in a penetrating manner; the tieback unit comprises a second outer layer mechanism and a second inner layer mechanism, the second outer layer mechanism is sleeved outside the second inner layer mechanism, the second outer layer mechanism is connected to the lower end of the first outer layer mechanism, and the second inner layer mechanism is connected to the lower end of the first inner layer mechanism; the slip rubber cylinder unit comprises a third outer layer mechanism and a central pipe, the third outer layer mechanism is sleeved outside the central pipe, the third outer layer mechanism comprises a sitting and hanging assembly, slips, a sitting and sealing assembly and a rubber cylinder group, the sitting and hanging assembly is axially arranged at the upper end and the lower end of the slips, the sitting and sealing assembly is axially arranged at the upper end and the lower end of the rubber cylinder group, and the rubber cylinder group is axially arranged below the slips at intervals; the deblocking unit comprises a connecting sleeve, a first deblocking elastic claw, a deblocking sleeve, a lower joint and deblocking shear pins, wherein the connecting sleeve is sleeved on the central tube and axially arranged at the lower end of the setting assembly; the upper end of the deblocking sleeve is penetrated in the first deblocking elastic claw, and the lower end of the deblocking sleeve is penetrated in the lower joint and connected with the lower joint through a deblocking shear pin; the first outer layer mechanism and the second outer layer mechanism can be pushed to move downwards relative to the first inner layer mechanism and the second inner layer mechanism along the axial direction, and the setting assembly are driven to respectively push the slips and the rubber cylinder group to be opened along the radial direction so as to realize setting and setting; the central tube can be pushed upwards and upwards after being sheared off, the deblocking shear pin drives the slips and the rubber cylinder group to shrink in the radial direction so as to realize deblocking.

Optionally, the first outer layer mechanism may include a first setting cylinder sleeve, a second setting cylinder sleeve, and a first setting piston connected in sequence, and further include a second setting piston disposed between the first setting cylinder sleeve and the setting intermediate joint; the first setting piston is sleeved and attached to the outer wall of the setting central pipe, through holes are formed in the side walls of the setting central pipe and the side walls of the setting intermediate joint and are communicated with gaps between the first outer layer mechanism and the first inner layer mechanism, setting balls can be put into the setting central pipe to seal the upper end of the setting ball seat, and well killing liquid in an inner cavity of the first inner layer mechanism can enter the gaps between the first outer layer mechanism and the first inner layer mechanism along the through holes so as to drive the first outer layer mechanism to descend relative to the first inner layer mechanism by pushing the first setting piston and the second setting piston.

Optionally, the tieback unit may further include a thrust sleeve and a lock sleeve, where the thrust sleeve and the lock sleeve are sequentially connected to the lower end of the second outer layer mechanism, and the thrust sleeve is fixedly connected to the central tube through a start shear pin, and the thrust sleeve and the lock sleeve can shear and downlink the start shear pin under the pushing of the second outer layer mechanism.

Alternatively, the setting assembly may include an upper cone mounted at an upper end of the slips and connected with a lower end of the sleeve, and a lower cone mounted at a lower end of the slips, the upper cone and the lower cone being insertable into a gap between the slips and the central tube under the pushing of the sleeve to radially expand the slips to set.

Optionally, the setting assembly may include an upper rubber cylinder seat and a lower rubber cylinder seat, the upper rubber cylinder seat is installed between the setting assembly and the rubber cylinder group, the lower rubber cylinder seat is installed between the connecting sleeve and the rubber cylinder group, and the upper rubber cylinder seat can push the rubber cylinder group downwards along the axial direction under the pushing of the setting assembly to extrude and bulge along the radial direction to realize setting.

Optionally, the rubber cylinder group may include a main rubber cylinder and auxiliary rubber cylinders respectively disposed at upper and lower ends of the main rubber cylinder, the third outer layer mechanism further includes two sets of casing components, each set of casing components includes a sealing support ring, a wrist band, a first sheath and a second sheath sequentially sleeved outside the central tube, each set of casing components further includes a reinforcing ring, and the reinforcing ring is disposed between the first sheath, the second sheath and the central tube; the two sets of protective cylinder components are symmetrically arranged at the upper end and the lower end of the rubber cylinder group.

Alternatively, the seal support ring, cuff and stiffening ring may be metallic materials and the first and second sheaths may be composite materials.

Optionally, the packing device may further include a pulling-type deblocking tool, where the pulling-type deblocking tool may extend into the hanging packer to perform deblocking operation, and the pulling-type deblocking tool includes an upper connection section, a middle pipe, a deblocking assembly, a pull-out assembly, and a guide shoe, where the middle pipe is threaded at a lower end of the upper connection section, the deblocking assembly is sleeved on the middle pipe and connected to a lower end of the upper connection section, the pull-out assembly is connected to a lower end of the middle pipe, and the guide shoe is connected to a lower end of the pull-out assembly; the deblocking assembly comprises an elastic piece, a second deblocking elastic claw and a supporting sleeve, the second deblocking elastic claw is sleeved outside the middle pipe, the elastic piece is arranged between the middle pipe and the second deblocking elastic claw, the upper end of the elastic piece is abutted with the lower end of the upper connecting section, and the lower end of the elastic piece is abutted with a step of the inner wall of the second deblocking elastic claw; the support sleeve is sleeved outside the middle pipe; the elastic piece can push the second deblocking elastic claw to descend along the middle pipe, and the lower end of the second deblocking elastic claw is sleeved at the upper end of the supporting sleeve; the support sleeve can radially expand the second deblocking elastic claw and clamp the second deblocking elastic claw at the lower end of the central pipe, so as to carry out deblocking operation on the suspended packer.

Optionally, the hand-off assembly may include a connection pipe, a hand-off elastic claw, and a hand-off inner sleeve, where the upper end of the connection pipe is sleeved on the lower section of the support sleeve and is fixedly connected with the support sleeve, and the lower end of the connection pipe is sleeved on the upper end of the guide shoe and is fixedly connected with the guide shoe; the stripping claw is positioned between the middle pipe and the connecting pipe, the upper end of the stripping claw is fixedly connected with the middle pipe, and the inner wall of the lower end of the stripping claw is tightly attached to the outer wall of the upper end of the stripping inner sleeve; the lower end of the hand-off inner sleeve is arranged in the guide shoe in a penetrating way and is fixedly connected with the guide shoe through a hand-off shear pin; the inner diameter of the hand-off inner sleeve is smaller than that of the middle pipe, the middle pipe can be put into the hand-off ball to plug the upper end of the hand-off inner sleeve, the hand-off inner sleeve can shear off and descend the hand-off shear pins under the action of pressure until the hand-off elastic claws are separated, and the second deblocking elastic claws can be lifted up along with the middle pipe and the upper connecting section and separated from the supporting sleeve to shrink and reset along the radial direction, so that the hand-off operation of the lifting deblocking tool in the hanging packer is realized.

The invention further provides a lifting type deblocking tool, which comprises an upper connecting section, a middle pipe, a deblocking assembly, a handle assembly and a guide shoe, wherein the middle pipe is arranged at the lower end of the upper connecting section in a penetrating way, the deblocking assembly is sleeved on the middle pipe and connected with the lower end of the upper connecting section, the handle assembly is connected with the lower end of the middle pipe, and the guide shoe is connected with the lower end of the handle assembly; the deblocking assembly comprises an elastic piece, a second deblocking elastic claw and a supporting sleeve, the second deblocking elastic claw is sleeved outside the middle pipe, the elastic piece is arranged between the middle pipe and the second deblocking elastic claw, the upper end of the elastic piece is abutted with the lower end of the upper connecting section, and the lower end of the elastic piece is abutted with a step of the inner wall of the second deblocking elastic claw; the support sleeve is sleeved outside the middle pipe; the elastic piece can push the second deblocking elastic claw to descend along the middle pipe, and the lower end of the second deblocking elastic claw is sleeved at the upper end of the supporting sleeve; the support sleeve can radially expand the second deblocking elastic claw and clamp the second deblocking elastic claw at the lower end of the central pipe, so as to carry out deblocking operation on the suspended packer.

Optionally, the hand-off assembly may include a connection pipe, a hand-off elastic claw, and a hand-off inner sleeve, where the upper end of the connection pipe is sleeved on the lower section of the support sleeve and is fixedly connected with the support sleeve, and the lower end of the connection pipe is sleeved on the upper end of the guide shoe and is fixedly connected with the guide shoe; the stripping claw is positioned between the middle pipe and the connecting pipe, the upper end of the stripping claw is fixedly connected with the middle pipe, and the inner wall of the lower end of the stripping claw is tightly attached to the outer wall of the upper end of the stripping inner sleeve; the lower end of the hand-off inner sleeve is arranged in the guide shoe in a penetrating way and is fixedly connected with the guide shoe through a hand-off shear pin; the inner diameter of the hand-off inner sleeve is smaller than that of the middle pipe, the middle pipe can be put into the hand-off ball to plug the upper end of the hand-off inner sleeve, the hand-off inner sleeve can shear off and descend the hand-off shear pins under the action of pressure until the hand-off elastic claws are separated, and the second deblocking elastic claws can be lifted up along with the middle pipe and the upper connecting section and separated from the supporting sleeve to shrink and reset along the radial direction so as to realize the hand-off operation.

The application of the above-mentioned sealing device or lifting type sealing tool in underground sealing operation.

Compared with the prior art, the invention has the beneficial effects that at least one of the following contents is included:

1. The rubber cylinder group in the suspended packer adopts the design of the anti-burst protection main sealing rubber cylinder which is formed by triple combination and symmetrical nesting arrangement of various materials, and compared with the existing rubber cylinder group which is single in material and simple in combination, the invention can improve the bearing capacity of the rubber cylinder and the performance of the suspended packer.

2. According to the invention, the rubber cylinder group is arranged below the slips, so that the packing pressure difference directly acts on the slips, the existing packing pressure difference acts on the slips through the central pipe force transmission, the stress condition of the suspended packer is optimized, and the central pipe is protected.

3. Compared with the existing ball injection deblocking, the deblocking type packing device provided by the invention has the advantages that the full-diameter of the inner pipe of the pipe column is realized, and the improvement of the operation capability of the sectional yield improvement of the well completion of the horizontal well is facilitated.

Drawings

The foregoing and other objects and/or features of the invention will become more apparent from the following description taken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates a cross-sectional view of a suspended packer in a releasable packing assembly in accordance with an exemplary embodiment of the invention.

Fig. 2 shows a partial enlarged view at a in fig. 1.

Fig. 3 shows a partial enlarged view at B in fig. 1.

Fig. 4 shows a cross-sectional view of a pull-up type decapsulation tool in an uncapping type packer apparatus of an exemplary embodiment of the invention.

Reference numerals illustrate:

1. a setting driving unit, 11, a first outer layer mechanism, 111, a first setting cylinder sleeve, 112, a second setting cylinder sleeve, 113, a first setting piston, 114, a second setting piston, 12, a first inner layer mechanism, 121, an upper joint, 122, a setting middle joint, 123, a setting central tube, 124, a setting ball seat, 2, a tieback unit, 21, a second outer layer mechanism, 211, a tieback cylinder, 22, a second inner layer mechanism, 23, a thrust sleeve, 24, a lock sleeve, 25, a start shear pin, 3, a slip rubber cylinder unit, 31, a third outer layer mechanism, 311, a setting assembly, 3111, an upper cone, 3112, a lower cone, 312, slips, 313, a setting assembly, 3131, an upper rubber cylinder seat, 3132, a lower rubber cylinder seat, 314, a rubber cylinder group, 3141, a main rubber cylinder, 3142, auxiliary rubber cylinder, 315, protective cylinder component, 3151, sealing support ring, 3152, wrist protector, 3153, first sheath, 3154, second sheath, 3155, reinforcing ring, 32, central tube, 4, deblocking unit, 41, connecting sleeve, 42, first deblocking spring claw, 43, deblocking sleeve, 44, lower joint, 45, deblocking shear pin, 5, upper connecting section, 51, joint, 52, first connecting tube, 53, second connecting tube, 6, intermediate tube, 7, deblocking component, 71, elastic piece, 72, second deblocking spring claw, 73, support sleeve, 8, deblocking component, 81, connecting tube, 82, deblocking spring claw, 83, deblocking inner sleeve, 84, deblocking shear pin, 9, guiding shoe, a, sealing ball, b, deblocking ball, c, first pressurizing chamber, d, second pressurizing chamber.

Detailed Description

Hereinafter, the unpackable packing device, the pull-up unpacking tool, and the application of the present invention will be described in detail with reference to exemplary embodiments.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

At present, when the sectional yield improvement of the well completion of the horizontal well is implemented, a yield improvement tool is put into a horizontal section, a suspension packer is put into a vertical well or a well section with smaller inclination by a drill rod, after a horizontal section tool pipe column is suspended on a sleeve by the suspension packer, the drill rod is separated from the suspension packer, and then a lower oil pipe tie-back tool pipe column is inserted into a tie-back sealing cylinder on the suspension packer for pipe column tie-back; the hanging packer in the related art mainly has the following technical defects: 1. the existing hanging packer rubber combination material is single in selection, simple in structure combination and limited in pressure bearing capacity. 2. The existing hanging packer deblocking mechanism is poor in reliability, and an emergency deblocking technology needs to be improved.

The invention provides a sealing device capable of being unsealed, a lifting type sealing tool and application, wherein the sealing device comprises a hanging packer, the hanging packer comprises a setting driving unit, a tie-back unit, a slip rubber unit and a sealing unit which are sequentially connected, the setting driving unit comprises a first outer layer mechanism and a first inner layer mechanism, the first outer layer mechanism is sleeved outside the first inner layer mechanism, and a gap is formed between the first outer layer mechanism and the first inner layer mechanism; the first inner layer mechanism comprises an upper joint, a setting middle joint, a setting central pipe and a setting ball seat, wherein the upper joint, the setting middle joint and the setting central pipe are sequentially connected, and the setting ball seat is arranged in the inner cavity of the setting central pipe in a penetrating manner; the tieback unit comprises a second outer layer mechanism and a second inner layer mechanism, the second outer layer mechanism is sleeved outside the second inner layer mechanism, the second outer layer mechanism is connected to the lower end of the first outer layer mechanism, and the second inner layer mechanism is connected to the lower end of the first inner layer mechanism; the slip rubber cylinder unit comprises a third outer layer mechanism and a central pipe, the third outer layer mechanism is sleeved outside the central pipe, the third outer layer mechanism comprises a sitting and hanging assembly, slips, a sitting and sealing assembly and a rubber cylinder group, the sitting and hanging assembly is axially arranged at the upper end and the lower end of the slips, the sitting and sealing assembly is axially arranged at the upper end and the lower end of the rubber cylinder group, and the rubber cylinder group is axially arranged below the slips at intervals; the deblocking unit comprises a connecting sleeve, a first deblocking elastic claw, a deblocking sleeve, a lower joint and deblocking shear pins, wherein the connecting sleeve is sleeved on the central tube and axially arranged at the lower end of the setting assembly; the upper end of the deblocking sleeve is penetrated in the first deblocking elastic claw, and the lower end of the deblocking sleeve is penetrated in the lower joint and connected with the lower joint through a deblocking shear pin; the first outer layer mechanism and the second outer layer mechanism can be pushed to move downwards relative to the first inner layer mechanism and the second inner layer mechanism along the axial direction, and the setting assembly are driven to respectively push the slips and the rubber cylinder group to be opened along the radial direction so as to realize setting and setting; the central tube can be pushed upwards and upwards after being sheared off, the deblocking shear pin drives the slips and the rubber cylinder group to shrink in the radial direction so as to realize deblocking.

The rubber cylinder group in the suspension packer adopts the design of the anti-burst protection main sealing rubber cylinder which is formed by triple combination and symmetrical nesting arrangement of various materials, and compared with the existing rubber cylinder group which is single in material and simple in combination, the rubber cylinder bearing capacity can be improved, and the performance of the suspension packer can be improved; according to the invention, the rubber cylinder group is arranged below the slips, so that the packing pressure difference directly acts on the slips, the existing packing pressure difference acts on the slips through the central pipe force transmission, the stress condition of the suspended packer is optimized, and the central pipe is protected; compared with the existing ball injection deblocking, the deblocking type packing device provided by the invention has the advantages that the full-diameter of the inner pipe of the pipe column is realized, and the improvement of the operation capability of the sectional yield improvement of the well completion of the horizontal well is facilitated.

Example embodiment 1

The present exemplary embodiment provides a resealable packing device.

FIG. 1 illustrates a cross-sectional view of a suspended packer in a releasable packing assembly in accordance with an exemplary embodiment of the invention; FIG. 2 shows a partial enlarged view at A in FIG. 1; FIG. 3 shows a partial enlarged view at B in FIG. 1; fig. 4 shows a cross-sectional view of a pull-up type decapsulation tool in an uncapping type packer apparatus of an exemplary embodiment of the invention.

As shown in fig. 1 to 4, the deblockable packing apparatus according to the present exemplary embodiment may include a hanging packer, which may include a setting driving unit 1, a tie-back unit 2, a slip packing unit 3, and a deblock unit 4, which are sequentially connected from top to bottom, wherein the setting driving unit 1 may include a first outer layer mechanism 11 and a first inner layer mechanism 12, the first outer layer mechanism 11 is sleeved outside the first inner layer mechanism 12, and a gap may be formed between the first outer layer mechanism 11 and the first inner layer mechanism 12; the first inner layer mechanism 12 may include an upper joint 121, a setting middle joint 122, a setting central tube 123 and a setting ball seat 124, where the upper joint 121, the setting middle joint 122 and the setting central tube 123 are sequentially butted from top to bottom to form a whole, and the setting ball seat 124 may be inserted into the setting central tube 123 and fixedly connected with the setting central tube 123 through a shear pin, as can be seen in fig. 2, the inner diameter of the setting ball seat 124 is smaller than the inner diameter of the setting central tube 123.

The tie-back unit 2 may include a second outer layer mechanism 21 and a second inner layer mechanism 22, the second outer layer mechanism 21 may be sleeved outside the second inner layer mechanism 22, the second outer layer mechanism 21 may include a tie-back cylinder 211, the second outer layer mechanism 21 may be fixedly connected to the lower end of the first outer layer mechanism 11, specifically, the tie-back cylinder 211 of the second outer layer mechanism 21 may be fixedly connected to the lower end of the first outer layer mechanism 11 through threads, and the second inner layer mechanism 22 may be fixedly connected to the lower end of the first inner layer mechanism 12 through threads.

The slip packing element unit 3 may include a third outer layer mechanism 31 and a central tube 32, the third outer layer mechanism 31 is sleeved outside the central tube 32, the third outer layer mechanism 31 may include a seat hanging component 311, a slip 312, a seat sealing component 313 and a packing element group 314, the seat hanging component 311 may be axially installed at the upper and lower ends of the slip 312, the seat sealing component 313 may be axially installed at the upper and lower ends of the packing element group 314, the packing element group 314 and the seat sealing component 313 may be axially installed at the lower ends of the seat hanging component 311 and the slip 312, and the packing element group 314 and the slip 312 may be spaced apart from each other.

The deblocking unit 4 may include a connection sleeve 41, a first deblocking claw 42, a deblocking sleeve 43, a lower joint 44, and a deblocking shear pin 45, the connection sleeve 41 may be sleeved on the central tube 32 from a lower end of the central tube 32 and fixedly connected to a lower end of the setting assembly 313 by threads in an axial direction, the lower joint 44 may be fixedly connected to a lower end of the connection sleeve 41 by threads, the first deblocking claw 42 may be fixedly connected to a lower end of the central tube 32 by threads and pass through the connection sleeve 41, that is, an upper end of the first deblocking claw 42 may be disposed between the central tube 32 and the connection sleeve 41; the upper end of the deblocking sleeve 43 is inserted into the first deblocking spring claw 42, so that the outer wall of the upper end of the deblocking sleeve 43 is tightly attached to the inner wall of the lower end of the first deblocking spring claw 42, that is, the lower end of the first deblocking spring claw 42 can be tightly clamped on the outer wall of the upper end of the deblocking sleeve 43; the lower end of the unsealing sleeve 43 can be penetrated in the lower joint 44, and the unsealing sleeve 43 and the lower joint 44 can be fixedly connected through unsealing shear pins 45.

The first outer layer mechanism 11 and the second outer layer mechanism 21 can move downwards relative to the first inner layer mechanism 12 and the second inner layer mechanism 22 under the action of axially downward pressure, so that the setting assembly 311 can be pushed to expand the slips 312 in the radial direction to realize the setting action, and meanwhile, the setting assembly 313 can be pushed to axially squeeze the rubber cylinder group 314 to expand outwards in the radial direction to realize the setting action.

The central tube 32 can shear the deblocking shear pin 45 through the first deblocking elastic claw 42 and the deblocking sleeve 43 which are connected with the lower end of the central tube 32 under the action of the axially upward pressure, the deblocking shear pin 45 can release the constraint of the central tube 32 after being sheared, the central tube can be lifted up together with the first outer layer mechanism 11 and the second outer layer mechanism 21, the slips 312 and the packing element 314 can be driven to shrink in the radial direction to restore to the original state, and the sitting and hanging assembly 311 and the sitting and hanging assembly 313 can also be restored to the original position in the axial direction, so that the deblocking operation of the hanging packer can be realized.

In this embodiment, the first outer layer mechanism 11 may include a first setting cylinder liner 111, a second setting cylinder liner 112, a first setting piston 113 and a second setting piston 114, where the first setting cylinder liner 111, the second setting cylinder liner 112 and the first setting piston 113 are sequentially connected from top to bottom to form the outer layer mechanism, the second setting piston 114 is installed between the first setting cylinder liner 111 and the setting intermediate joint 122, that is, the second setting piston 114 is installed in a gap between the outer layer mechanism and the inner layer mechanism, and may seal the gap; the first setting piston 113 may be abutted against the outer wall of the setting center tube 123.

Here, a first pressurizing chamber c may be formed between the inner wall of the first setting cylinder liner 111, the outer wall of the setting intermediate joint 122, the upper end of the second setting piston 114, and the lower end of the upper joint 121, a second pressurizing chamber d may be formed between the inner wall of the second setting cylinder liner 112, the outer wall of the setting central tube 123, the upper end of the first setting piston 113, and the lower end of the setting intermediate joint 122, and through holes formed in the side walls of the setting intermediate joint 122 and the setting central tube 123 may be respectively communicated with the first pressurizing chamber c and the second pressurizing chamber d.

In this embodiment, the tie-back unit 2 further includes a thrust sleeve 23 and a lock sleeve 24, where the thrust sleeve 23 and the lock sleeve 24 may be sequentially connected to the lower end of the second outer layer mechanism 21 from top to bottom, and the thrust sleeve 23 and the lock sleeve 24 are sleeved on the central tube 32, and a start shear pin 25 is disposed on the radial inner side of the thrust sleeve 23, and the start shear pin 25 may be inserted into the side wall of the central tube 32, so that the thrust sleeve 23 is axially fixed on the central tube 32; the thrust sleeve 23 can be pushed by the downward axial force exerted by the first outer layer mechanism 11 and the second outer layer mechanism 21 to shear the start shear pins 25 and push the lock sleeve 24 to move downwards together to perform setting operation of the suspended packer.

In this embodiment, the hitch assembly 311 may include an upper cone 3111 and a lower cone 3112, the upper cone 3111 may be mounted at an upper end of the slips 312 and connected to a lower end of the lock sleeve 24, that is, the upper cone 3111 may be mounted between the slips 312 and the lock sleeve 24, the lower cone 3112 may be mounted at a lower end of the slips 312, and tapered portions of the upper cone 3111 and the lower cone 3112 may be inserted inside the slips 312 under the pushing of the lock sleeve 24 and the thrust sleeve 23, that is, in a gap between the slips 312 and the center tube 32, so that the slips 312 may be radially opened, and closely adhered to an inner wall of the wellbore, thereby achieving a hitch operation of the slips.

In the present embodiment, the setting assembly 313 may include an upper rubber seat 3131 and a lower rubber seat 3132, the upper rubber seat 3131 may be installed at the upper end of the rubber set 314 while being located at the lower end of the lower cone 3112, that is, the upper rubber seat 3131 is installed between the rubber set 314 and the lower cone 3112; the lower rubber block 3132 may be installed at the lower end of the rubber block 314 while being located at the upper end of the connecting sleeve 41, that is, the lower rubber block 3132 is installed between the rubber block 314 and the connecting sleeve 41; the upper rubber cylinder block 3131 can push the rubber cylinder group 314 downwards along the axial direction under the pushing of the upper component (the lower cone 3112) so that the rubber cylinder group 314 expands and protrudes along the radial direction, and is clung to the inner wall of a shaft to realize setting operation.

Optionally, the rubber cylinder group 314 may include a main rubber cylinder 3141 and two sets of auxiliary rubber cylinders 3142, the third outer layer mechanism 31 further includes two sets of casing components 315, the two sets of auxiliary rubber cylinders 3142 are symmetrically installed at the upper and lower ends of the main rubber cylinder 3141, and the two sets of auxiliary rubber cylinders 3142 and the main rubber cylinder 3141 are tightly matched to form an integral structure; the two sets of protection cylinder assemblies 315 are symmetrically arranged at the upper end and the lower end of the two sets of auxiliary rubber cylinders 3142 respectively, the protection cylinder assemblies 315 can form an axial protection effect on the rubber cylinder assemblies 314, the rubber cylinder assemblies 314 are prevented from axially protruding in the annular space of the well wall while being expanded and protruding in the radial direction under stress, and the setting effect of the rubber cylinders is ensured.

Alternatively, each of the two sets of cage assemblies 315 may include a seal support ring 3151, a cuff 3152, a first sheath 3153, a second sheath 3154, and a reinforcing ring 3155, in particular, the cage assembly 315 disposed at the upper end of the set of rubber barrels 314 may include a seal support ring 3151, a cuff 3152, a first sheath 3153, and a second sheath 3154 that are sequentially sleeved on the center tube 32 from top to bottom, the reinforcing ring 3155 may be installed between the first sheath 3153, the second sheath 3154, and the center tube 32, and the reinforcing ring 3155 may be in close contact with the first sheath 3153, the second sheath 3154, and the center tube 32; the casing assembly 315 disposed at the lower end of the rubber cylinder set 314 may include a second sheath, a first sheath, a wrist band and a sealing support ring sequentially sleeved on the central tube 32 from top to bottom, the reinforcing ring may be installed between the first sheath, the second sheath and the central tube, and the reinforcing ring may be tightly attached to the first sheath, the second sheath and the central tube; that is, the two sets of casing assemblies 315 may be symmetrically disposed at the upper and lower ends of the rubber set 314; however, the invention is not limited thereto and the two sets of cage assemblies 315 may include other types of components, as the invention is not limited in this regard.

Alternatively, the materials of the main rubber 3141 and the auxiliary rubber 3142 may be the same or different materials, the materials of the seal support ring 3151, the cuff 3152 and the reinforcing ring 3155 may be metal materials, and the materials of the first sheath 3153 and the second sheath 3154 may be composite materials; the invention does not limit the materials of the components, and the materials can be arbitrarily selected according to the actual operation requirement.

When the setting operation of the suspension packer in this embodiment is required, a setting ball a may be put into the upper end of the upper joint 121, and since the outer diameter of the setting ball a is smaller than the inner diameters of the upper joint 121, the setting middle joint 122 and the setting center pipe 123 and the outer diameter of the setting ball a is larger than the inner diameter of the setting ball seat 124, the setting ball a may descend in the axial direction until reaching the upper end of the setting ball seat 124, so that the upper end of the setting ball seat 124 may be plugged; preferably, a chamfer matched with the outer surface of the setting ball a can be formed at the upper end of the inner wall of the setting ball seat 124 so as to enable the setting ball a to be better attached to the upper end of the setting ball seat 124, and the plugging performance of the setting ball a on the setting ball seat 124 can be improved; at this time, well killing fluid is input into the upper end of the upper joint 121 through the pipe column and is suppressed, because of the plugging effect of the setting ball a on the setting ball seat 124, the well killing fluid cannot continue to descend along the setting ball seat 124, and only can enter the first pressurizing chamber c and the second pressurizing chamber d from the through holes on the side walls of the setting middle joint 122 and the setting center pipe 123 respectively, along with the continuous increase of pressure, the well killing fluid in the first pressurizing chamber c and the second pressurizing chamber d can push the second setting piston 114 and the first setting piston 113 to descend at the same time, so that the first outer layer mechanism 11, the second outer layer mechanism 21, the thrust sleeve 23, the lock sleeve 24 and the upper cone 3111 are pushed to descend integrally, so that the slips 312 can be opened to realize setting, the lower cone 3112 can push the upper cone seat 3131 to descend, so that the packing set 314 can be extruded and expanded in the radial direction to realize setting, and finally, the setting operation of hanging the packer is realized.

In this embodiment, the deblocking device according to this exemplary embodiment may further include a pulling deblocking tool, where the pulling deblocking tool may extend into the hanging packer to perform deblocking operation, and the pulling deblocking tool may include an upper connection section 5, a middle pipe 6, a deblocking assembly 7, a pulling component 8, and a guide shoe 9, where the middle pipe 6 may be threaded at the lower end of the upper connection section 5, the deblocking assembly 7 may be sleeved on the middle pipe 6, and the upper end thereof may be sleeved at the lower end of the upper connection section 5, the pulling component 8 may be fixedly connected at the lower end of the middle pipe 6, and the guide shoe 9 may be fixedly connected at the lower end of the pulling component 8 through threads.

The deblocking assembly 7 may include an elastic member 71, a second deblocking elastic claw 72 and a supporting sleeve 73, the second deblocking elastic claw 72 may be sleeved outside the intermediate pipe 6, the elastic member 71 may be installed between the intermediate pipe 6 and the second deblocking elastic claw 72, the upper end of the elastic member 71 may abut against the lower end of the upper connection section 5, and the lower end of the elastic member 71 may abut against a step on the inner wall of the second deblocking elastic claw 72; the supporting sleeve 73 can be sleeved outside the middle pipe 6, and the outer diameter of the upper end of the supporting sleeve 73 is larger than the outer diameter of the middle pipe 6; when the second deblocking spring 72 is restrained by the axial upward force, that is, the second deblocking spring 72 is located at the upper section of the intermediate pipe 6, that is, at the upper end of the moving stroke, the elastic member 71 may be compressed, and the radially protruding portion at the lower end thereof is also located above the supporting sleeve 73, at this time, the second deblocking spring 72 is in an initial undeployed state, after the second deblocking spring 72 is relieved from the axial restraint, the second deblocking spring 72 may be pushed to move downward in the axial direction under the elastic action of the elastic member 71 until the radially protruding portion at the lower end thereof is sleeved at the upper end of the supporting sleeve 73, at this time, the lower end of the second deblocking spring 72 may be radially stretched under the action of the supporting sleeve 73, and the radially protruding portion at the lower end thereof may be clamped at the lower end of the central pipe 32 of the hanging packer, thereby operating the pull-type deblocking tool to deblock the hanging packer.

Alternatively, the hand-removing assembly 8 may include a connecting pipe 81, a hand-removing elastic claw 82 and a hand-removing inner sleeve 83, wherein the upper end of the connecting pipe 81 may be sleeved on the lower section of the supporting sleeve and fixedly connected with the supporting sleeve 73, and the lower end of the connecting pipe 81 may be sleeved on the upper end of the guide shoe 9 and fixedly connected with the guide shoe 9; the stripping claw 82 can be installed between the middle pipe 6 and the connecting pipe 81, the upper end of the stripping claw 82 can be fixedly connected with the middle pipe 6 through threads, the inner wall of the lower end of the stripping claw 82 can be tightly attached to the outer wall of the upper end of the stripping inner sleeve 83, that is, the stripping claw 82 can be clamped at the upper end of the stripping inner sleeve 83 through the elastic action of the lower end of the stripping claw 82; the lower end of the hand-off inner sleeve 83 can be inserted into the guide shoe 9 and fixedly connected with the guide shoe 9 through the hand-off shear pin 84.

In this embodiment, the upper connection section 5 may include a joint 51, a first connection pipe 52 and a second connection pipe 53 sequentially connected from top to bottom, the inner diameters of the joint 51, the first connection pipe 52 and the second connection pipe 53 are the same, and the inner cavities of the joint 51, the first connection pipe 52 and the second connection pipe 53 may be communicated with the inner cavity of the intermediate pipe 6; the connection manner among the joint 51, the first connection pipe 52 and the second connection pipe 53 may be arbitrarily selected, for example, the joint 51, the first connection pipe 52 and the second connection pipe 53 may be integrally formed with the upper connection section 5 through an integrally formed connection, which is not particularly limited in the present invention.

If the suspended packer is in advance set due to abnormal lowering of the suspended packer or the suspended packer needs to be lifted out of the well in later period, the suspended packer needs to be unpacked, the lifting unpacking tool can be extended into the suspended packer from the upper end of the upper joint 121, and the elastic piece 71 is compressed in the axial descending process, so that the second unpacking elastic claw 72 is located at the initial position and is in an unopened state; when the radially protruding portion at the lower end of the second deblocking claw 72 comes under the central tube 32, the elastic member 71 may push the second deblocking claw 72 downward, the second deblocking claw 72 may be expanded radially under the action of the supporting sleeve 73, so that the radially protruding portion at the lower end of the second deblocking claw 72 abuts against the lower end of the central tube 32, at this time, the second deblocking claw 72 may apply an upward axial force to the central tube 32, the axial force may be transferred to the deblocking sleeve 43 along the first deblocking claw 42, when the axial force increases sufficiently, the deblocking shear pin 45 between the deblocking sleeve 43 and the lower joint 44 may be sheared, and then the lifting of the first deblocking claw 42 may be continued, the deblocking sleeve 43 may drop down into the lower joint 44, the first deblocking claw 42 may move upward with the central tube 32, and at the same time, the third outer layer mechanism 31, the second outer layer 21 and the first layer 314 may be restored to the original position, and the first layer 11 may be restored to the original position, thereby restoring the original position.

If an abnormality occurs in the process of unsetting the suspended packer, the unsetting tool can be unsetted from the suspended packer, specifically, the unsetting ball b can be thrown into the upper connecting section 5 from the upper end of the joint 51, the unsetting ball b can reach the upper end of the unsetting inner sleeve 83 along the upper connecting section 5 and the middle pipe 6, the unsetting inner sleeve 83 can be plugged by the unsetting ball b because the outer diameter of the unsetting ball b is larger than the inner diameter of the unsetting inner sleeve 83, at this time, a well killing liquid can be input into the unsetting tool and is pressed, the unsetting inner sleeve 83 can shear off the unsetting shear pin 84 under the downward pressure, the unsetting inner sleeve 83 can be enabled to descend and be separated from the lower end of the unsetting claw 82 by continuing to pressurize, at the upper connecting section 5 can be lifted, the middle pipe 6, the unsetting claw 82 and the second unsetting claw 72 can be lifted up together, the unsetting claw 72 can leave the upper end of the supporting sleeve and be contracted in the radial direction, and the unsetting tool can be lifted up by the suspended tool, and the suspended packer can be completely suspended by the suspended tool.

Example embodiment 2

The present exemplary embodiment provides a pull-up deblocking tool.

The lifting type deblocking tool according to the present exemplary embodiment may be used for deblocking the suspended packer described in exemplary embodiment 1, or may be used for deblocking a suspended packer of other structures that may be deblocked by lifting, which is not particularly limited in the present invention.

The pull-up type deblocking tool according to the present exemplary embodiment is identical to the pull-up type deblocking tool described in exemplary embodiment 1 in structure and function, and this exemplary embodiment will not be described again.

Example embodiment 3

The present exemplary embodiment provides a method for applying a releasable packing device in a downhole packing operation.

The application method described in the present exemplary embodiment may employ the resealable packing device described in exemplary embodiment 1, or the pull-up type deblocking tool described in exemplary embodiment 2.

As shown in fig. 1 to 4, the application method described in the present exemplary embodiment may include the steps of:

when the setting operation of the suspension packer in this embodiment is required, a setting ball a may be put into the upper end of the upper joint 121, and since the outer diameter of the setting ball a is smaller than the inner diameters of the upper joint 121, the setting middle joint 122 and the setting center pipe 123 and the outer diameter of the setting ball a is larger than the inner diameter of the setting ball seat 124, the setting ball a may descend in the axial direction until reaching the upper end of the setting ball seat 124, so that the upper end of the setting ball seat 124 may be plugged; preferably, a chamfer matched with the outer surface of the setting ball a can be formed at the upper end of the inner wall of the setting ball seat 124 so as to enable the setting ball a to be better attached to the upper end of the setting ball seat 124, and the plugging performance of the setting ball a on the setting ball seat 124 can be improved; at this time, well killing fluid is input into the upper end of the upper joint 121 through the pipe column and is suppressed, because of the plugging effect of the setting ball a on the setting ball seat 124, the well killing fluid cannot continue to descend along the setting ball seat 124, and only can enter the first pressurizing chamber c and the second pressurizing chamber d from the through holes on the side walls of the setting middle joint 122 and the setting center pipe 123 respectively, along with the continuous increase of pressure, the well killing fluid in the first pressurizing chamber c and the second pressurizing chamber d can push the second setting piston 114 and the first setting piston 113 to descend at the same time, so that the first outer layer mechanism 11, the second outer layer mechanism 21, the thrust sleeve 23, the lock sleeve 24 and the upper cone 3111 are pushed to descend integrally, so that the slips 312 can be opened to realize setting, the lower cone 3112 can push the upper cone seat 3131 to descend, so that the packing set 314 can be extruded and expanded in the radial direction to realize setting, and finally, the setting operation of hanging the packer is realized.

If the suspended packer is in advance set due to abnormal lowering of the suspended packer or the suspended packer needs to be lifted out of the well in later period, the suspended packer needs to be unpacked, the lifting unpacking tool can be extended into the suspended packer from the upper end of the upper joint 121, and the elastic piece 71 is compressed in the axial descending process, so that the second unpacking elastic claw 72 is located at the initial position and is in an unopened state; when the radially protruding portion at the lower end of the second deblocking claw 72 comes under the central tube 32, the elastic member 71 may push the second deblocking claw 72 downward, the second deblocking claw 72 may be expanded radially under the action of the supporting sleeve 73, so that the radially protruding portion at the lower end of the second deblocking claw 72 abuts against the lower end of the central tube 32, at this time, the second deblocking claw 72 may apply an upward axial force to the central tube 32, the axial force may be transferred to the deblocking sleeve 43 along the first deblocking claw 42, when the axial force increases sufficiently, the deblocking shear pin 45 between the deblocking sleeve 43 and the lower joint 44 may be sheared, and then the lifting of the first deblocking claw 42 may be continued, the deblocking sleeve 43 may drop down into the lower joint 44, the first deblocking claw 42 may move upward with the central tube 32, and at the same time, the third outer layer mechanism 31, the second outer layer 21 and the first layer 314 may be restored to the original position, and the first layer 11 may be restored to the original position, thereby restoring the original position.

If an abnormality occurs in the process of unsetting the suspended packer, the unsetting tool can be unsetted so as to be separated from the suspended packer, specifically, the unsetting ball b can be thrown into the upper connecting section 5 from the upper end of the joint 51, the unsetting ball b can reach the upper end of the unsetting inner sleeve 83 along the upper connecting section 5 and the middle pipe 6, the unsetting inner sleeve 83 can be plugged by the unsetting ball b because the outer diameter of the unsetting ball b is larger than the inner diameter of the unsetting inner sleeve 83, at the moment, a well killing liquid can be input into the unsetting tool and is pressed, the unsetting inner sleeve 83 can shear off the unsetting shear pin 84 under the downward pressure, the unsetting inner sleeve 83 can be enabled to descend and separate from the lower end of the unsetting claw 82 by continuing to press, at the upper connecting section 5, the middle pipe 6, the unsetting claw 82 and the second unsetting claw 72 can be lifted together, the second unsetting claw 72 can leave the upper end of the supporting sleeve and be radially contracted, and the unsetting tool can be lifted up by the suspended tool, and the suspended packer can be completely suspended by the suspended tool.

In summary, the design of the anti-burst protection main sealing rubber sleeve with the triple combination symmetrical nesting arrangement of multiple materials is adopted for the rubber sleeve group in the suspension packer, and compared with the existing rubber sleeve group with single material and simple combination, the anti-burst protection main sealing rubber sleeve has the advantages that the bearing capacity of the rubber sleeve can be improved, and the performance of the suspension packer is improved; according to the invention, the rubber cylinder group is arranged below the slips, so that the packing pressure difference directly acts on the slips, the existing packing pressure difference acts on the slips through the central pipe force transmission, the stress condition of the suspended packer is optimized, and the central pipe is protected; compared with the existing ball injection deblocking, the deblocking type packing device provided by the invention has the advantages that the full-diameter of the inner pipe of the pipe column is realized, and the improvement of the operation capability of the sectional yield improvement of the well completion of the horizontal well is facilitated.

Although the present invention has been described above with reference to the exemplary embodiments and the accompanying drawings, it should be apparent to those of ordinary skill in the art that various modifications can be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims (12)

1. The packing device capable of being unpacked is characterized by comprising a hanging packer, wherein the hanging packer comprises a setting driving unit, a tieback unit, a slip rubber unit and an unpacking unit which are connected in sequence,

the setting driving unit comprises a first outer layer mechanism and a first inner layer mechanism, the first outer layer mechanism is sleeved outside the first inner layer mechanism, and a gap is formed between the first outer layer mechanism and the first inner layer mechanism; the first inner layer mechanism comprises an upper joint, a setting middle joint, a setting central pipe and a setting ball seat, wherein the upper joint, the setting middle joint and the setting central pipe are sequentially connected, and the setting ball seat is arranged in the inner cavity of the setting central pipe in a penetrating manner;

the tieback unit comprises a second outer layer mechanism and a second inner layer mechanism, the second outer layer mechanism is sleeved outside the second inner layer mechanism, the second outer layer mechanism is connected to the lower end of the first outer layer mechanism, and the second inner layer mechanism is connected to the lower end of the first inner layer mechanism;

The slip rubber cylinder unit comprises a third outer layer mechanism and a central pipe, the third outer layer mechanism is sleeved outside the central pipe, the third outer layer mechanism comprises a sitting and hanging assembly, slips, a sitting and sealing assembly and a rubber cylinder group, the sitting and hanging assembly is axially arranged at the upper end and the lower end of the slips, the sitting and sealing assembly is axially arranged at the upper end and the lower end of the rubber cylinder group, and the rubber cylinder group is axially arranged below the slips at intervals;

the deblocking unit comprises a connecting sleeve, a first deblocking elastic claw, a deblocking sleeve, a lower joint and deblocking shear pins, wherein the connecting sleeve is sleeved on the central tube and axially arranged at the lower end of the setting assembly; the upper end of the deblocking sleeve is penetrated in the first deblocking elastic claw, and the lower end of the deblocking sleeve is penetrated in the lower joint and connected with the lower joint through a deblocking shear pin;

the first outer layer mechanism and the second outer layer mechanism can be pushed to move downwards relative to the first inner layer mechanism and the second inner layer mechanism along the axial direction, and the setting assembly are driven to respectively push the slips and the rubber cylinder group to be opened along the radial direction so as to realize setting and setting;

the central tube can be pushed upwards and upwards after being sheared off, the deblocking shear pin drives the slips and the rubber cylinder group to shrink in the radial direction so as to realize deblocking.

2. The deblockable packing assembly of claim 1, wherein the first outer layer mechanism comprises a first set cylinder liner, a second set cylinder liner, and a first set piston connected in sequence, further comprising a second set piston disposed between the first set cylinder liner and the set intermediate joint; the first setting piston is sleeved and attached to the outer wall of the setting central pipe, through holes are formed in the side walls of the setting central pipe and the side walls of the setting intermediate joint and are communicated with gaps between the first outer layer mechanism and the first inner layer mechanism, setting balls can be put into the setting central pipe to seal the upper end of the setting ball seat, and well killing liquid in an inner cavity of the first inner layer mechanism can enter the gaps between the first outer layer mechanism and the first inner layer mechanism along the through holes so as to drive the first outer layer mechanism to descend relative to the first inner layer mechanism by pushing the first setting piston and the second setting piston.

3. The seal-type packing device of claim 1, wherein the tieback unit further comprises a push sleeve and a lock sleeve, the push sleeve and the lock sleeve are sequentially connected to the lower end of the second outer layer mechanism, the push sleeve is fixedly connected with the central tube through a start shear pin, and the push sleeve and the lock sleeve can shear and descend the start shear pin under the pushing of the second outer layer mechanism.

4. A releasable seal as claimed in claim 3, wherein the setting assembly comprises an upper cone mounted on the upper end of the slips and connected to the lower end of the sleeve, and a lower cone mounted on the lower end of the slips, the upper cone and lower cone being insertable into the gap between the slips and the central tube under the urging of the sleeve to radially expand the slips to set.

5. The seal-removable packing apparatus of claim 1, wherein the setting assembly comprises an upper rubber cylinder seat and a lower rubber cylinder seat, the upper rubber cylinder seat is mounted between the setting assembly and the rubber cylinder group, the lower rubber cylinder seat is mounted between the connecting sleeve and the rubber cylinder group, and the upper rubber cylinder seat can push the rubber cylinder group downwards along the axial direction under the pushing of the setting assembly to squeeze and bulge the rubber cylinder group along the radial direction to realize setting.

6. The unsealable packing device of claim 1, wherein the set of packing elements comprises a main packing element and auxiliary packing elements respectively disposed at upper and lower ends of the main packing element, the third outer layer mechanism further comprises two sets of casing elements, each set of casing elements comprises a sealing support ring, a wrist band, a first sheath and a second sheath sequentially sleeved outside the central tube, each set of casing elements further comprises a reinforcing ring disposed between the first sheath, the second sheath and the central tube; the two sets of protective cylinder components are symmetrically arranged at the upper end and the lower end of the rubber cylinder group.

7. The unsealable enclosure of claim 6, wherein the seal support ring, the cuff, and the reinforcing ring are metallic materials and the first sheath and the second sheath are composite materials.

8. The deblockable packing assembly of claim 1 further comprising a pull-up deblocking tool capable of extending into the suspended packer for deblocking operations, the pull-up deblocking tool comprising an upper connection section, a middle tube, a deblocking assembly, a hands-off assembly, and a guide shoe, wherein,

the middle pipe is arranged at the lower end of the upper connecting section in a penetrating way, the deblocking assembly is sleeved on the middle pipe and connected with the lower end of the upper connecting section, the handle-off assembly is connected with the lower end of the middle pipe, and the guide shoe is connected with the lower end of the handle-off assembly;

the deblocking assembly comprises an elastic piece, a second deblocking elastic claw and a supporting sleeve, the second deblocking elastic claw is sleeved outside the middle pipe, the elastic piece is arranged between the middle pipe and the second deblocking elastic claw, the upper end of the elastic piece is abutted with the lower end of the upper connecting section, and the lower end of the elastic piece is abutted with a step of the inner wall of the second deblocking elastic claw; the support sleeve is sleeved outside the middle pipe; the elastic piece can push the second deblocking elastic claw to descend along the middle pipe, and the lower end of the second deblocking elastic claw is sleeved at the upper end of the supporting sleeve; the support sleeve can radially expand the second deblocking elastic claw and clamp the second deblocking elastic claw at the lower end of the central pipe, so as to carry out deblocking operation on the suspended packer.

9. The seal-type packing device of claim 8, wherein the hand-off assembly comprises a connecting pipe, a hand-off elastic claw and a hand-off inner sleeve, the upper end of the connecting pipe is sleeved on the lower section of the supporting sleeve and fixedly connected with the supporting sleeve, and the lower end of the connecting pipe is sleeved on the upper end of the guide shoe and fixedly connected with the guide shoe; the stripping claw is positioned between the middle pipe and the connecting pipe, the upper end of the stripping claw is fixedly connected with the middle pipe, and the inner wall of the lower end of the stripping claw is tightly attached to the outer wall of the upper end of the stripping inner sleeve; the lower end of the hand-off inner sleeve is arranged in the guide shoe in a penetrating way and is fixedly connected with the guide shoe through a hand-off shear pin;

the inner diameter of the hand-off inner sleeve is smaller than that of the middle pipe, the middle pipe can be put into the hand-off ball to plug the upper end of the hand-off inner sleeve, the hand-off inner sleeve can shear off and descend the hand-off shear pins under the action of pressure until the hand-off elastic claws are separated, and the second deblocking elastic claws can be lifted up along with the middle pipe and the upper connecting section and separated from the supporting sleeve to shrink and reset along the radial direction, so that the hand-off operation of the lifting deblocking tool in the hanging packer is realized.

10. A lifting type deblocking tool is characterized by comprising an upper connecting section, a middle pipe, a deblocking component, a handle component and a guide shoe, wherein,

The middle pipe is arranged at the lower end of the upper connecting section in a penetrating way, the deblocking assembly is sleeved on the middle pipe and connected with the lower end of the upper connecting section, the handle-off assembly is connected with the lower end of the middle pipe, and the guide shoe is connected with the lower end of the handle-off assembly;

the deblocking assembly comprises an elastic piece, a second deblocking elastic claw and a supporting sleeve, the second deblocking elastic claw is sleeved outside the middle pipe, the elastic piece is arranged between the middle pipe and the second deblocking elastic claw, the upper end of the elastic piece is abutted with the lower end of the upper connecting section, and the lower end of the elastic piece is abutted with a step of the inner wall of the second deblocking elastic claw; the support sleeve is sleeved outside the middle pipe; the elastic piece can push the second deblocking elastic claw to descend along the middle pipe, and the lower end of the second deblocking elastic claw is sleeved at the upper end of the supporting sleeve; the support sleeve can radially expand the second deblocking elastic claw and clamp the second deblocking elastic claw at the lower end of the central pipe, so as to carry out deblocking operation on the suspended packer.

11. The lifting deblocking tool of claim 10, wherein the hand-off assembly comprises a connecting pipe, a hand-off elastic claw and a hand-off inner sleeve, the upper end of the connecting pipe is sleeved on the lower section of the supporting sleeve and fixedly connected with the supporting sleeve, and the lower end of the connecting pipe is sleeved on the upper end of the guide shoe and fixedly connected with the guide shoe; the stripping claw is positioned between the middle pipe and the connecting pipe, the upper end of the stripping claw is fixedly connected with the middle pipe, and the inner wall of the lower end of the stripping claw is tightly attached to the outer wall of the upper end of the stripping inner sleeve; the lower end of the hand-off inner sleeve is arranged in the guide shoe in a penetrating way and is fixedly connected with the guide shoe through a hand-off shear pin;

The inner diameter of the hand-off inner sleeve is smaller than that of the middle pipe, the middle pipe can be put into the hand-off ball to plug the upper end of the hand-off inner sleeve, the hand-off inner sleeve can shear off and descend the hand-off shear pins under the action of pressure until the hand-off elastic claws are separated, and the second deblocking elastic claws can be lifted up along with the middle pipe and the upper connecting section and separated from the supporting sleeve to shrink and reset along the radial direction so as to realize the hand-off operation.

12. Use of a resealable packing device according to any one of claims 1 to 9 or a pull-up type uncapping tool according to any one of claims 10 to 11 in a downhole packing operation.