CN109025893B

CN109025893B - Detachable packer

Info

Publication number: CN109025893B
Application number: CN201811089825.XA
Authority: CN
Inventors: 李晓军; 高振南; 杨少勇; 甘勇; 魏燕; 张胜鹏; 张昕; 李富强
Original assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Filing date: 2018-09-18
Publication date: 2024-07-02
Anticipated expiration: 2038-09-18

Abstract

The invention relates to the technical field of packers, in particular to a split packer; the slip anchor comprises a slip anchor device and a rubber cylinder sealing device; the lower end of the slip anchoring device and the upper end of the rubber cylinder sealing device are fixedly installed together in a detachable mode; the slip anchoring device comprises an anchoring connection mandrel and a slip anchoring mechanism; the rubber cylinder sealing device comprises a rubber cylinder connecting mandrel and a rubber cylinder sealing mechanism; the anchoring connection mandrel and the rubber cylinder connection mandrel are respectively of hollow shaft structures, threads are arranged outside the lower end of the anchoring connection mandrel, and threads are arranged in the upper end of the rubber cylinder connection mandrel. The invention has reasonable and compact structure and convenient use; the slip anchoring device and the rubber cylinder sealing device are connected in a detachable mode, so that the slip anchoring device and the rubber cylinder sealing device can be combined and detached according to practical application, multipurpose packing is effectively realized, the application range is wider, and the use is more flexible; the functions of each part of the packer tool are fully exerted, and the manufacturing cost of the packer is reduced.

Description

Detachable packer

Technical Field

The invention relates to the technical field of packers, in particular to a split packer.

Background

At present, in the construction processes of oil and gas field well completion, well repair, production increase operation and the like, annular spaces between various size tubular columns and wellbores and between tubular columns are often required to be sealed by using a packer so as to realize the purposes of layered and segmented exploitation, water shutoff control, reservoir reconstruction and the like; the existing packer is used for sealing between an oil pipe and a casing, and is usually provided with a sealing part with a rubber sleeve and an anchoring part with a slip for simultaneous action so as to ensure the sealing effect; however, when the packer with the functions of both the rubber sealing and the slip anchoring is used for sealing between a casing and a borehole, only the rubber sealing part is effective, the slip anchoring part has limited functions on the borehole wall, and the packer cannot be used, and is redundant; the application range is small, and the processing cost is high.

Disclosure of Invention

The invention provides a split packer, which overcomes the defects of the prior art, and can effectively solve the problems that the existing packer provided with a rubber cylinder sealing part and a slip anchoring part cannot play a role when the slip anchoring part is used for sealing between a casing and a borehole, and has redundant parts and small application range.

The technical scheme of the invention is realized by the following measures: a split packer comprises a slip anchoring device and a rubber cylinder sealing device; the lower end of the slip anchoring device and the upper end of the rubber cylinder sealing device are fixedly installed together in a detachable mode.

The following are further optimizations and/or improvements to the above-described inventive solution:

The slip anchoring device can comprise an anchoring connection mandrel and a slip anchoring mechanism; the rubber cylinder sealing device comprises a rubber cylinder connecting mandrel and a rubber cylinder sealing mechanism; the lower end of the anchoring connection mandrel and the upper end of the rubber cylinder connection mandrel are fixedly installed together through threads.

The anchoring connecting mandrel can be an upper section split mandrel and a lower section split mandrel, and comprises an upper anchoring connecting mandrel and a lower anchoring connecting mandrel; the lower end of the upper anchoring connecting mandrel is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower anchoring connecting mandrel through the thread; the outer part of the lower end of the lower anchoring connecting mandrel is fixedly arranged with the inner part of the upper end of the rubber cylinder connecting mandrel through threads; the slip anchoring mechanism comprises a slip assembly, an anchoring hydraulic sliding sleeve and a first shearing pin; the anchoring hydraulic sliding sleeve is sleeved on the lower anchoring connecting mandrel, and an anchoring sliding sleeve anti-retreating mechanism is arranged between the anchoring hydraulic sliding sleeve and the lower anchoring connecting mandrel; the lower end of the anchoring hydraulic sliding sleeve is fixedly arranged outside the lower anchoring connecting mandrel through a first shear pin; the upper end of the anchoring hydraulic sliding sleeve is provided with a first sealing ring table, and the first sealing ring table is sleeved outside the lower side of the upper anchoring connecting mandrel in a sealing way; an upper hydraulic sealing cavity is formed among the lower anchoring connecting mandrel, the upper anchoring connecting mandrel, the anchoring hydraulic sliding sleeve and the first sealing ring table, and a pressure transmission hole I which can enable an inner hole of the anchoring connecting mandrel to be communicated with the upper hydraulic sealing cavity is formed on the upper anchoring connecting mandrel; the slip assembly which can be pushed to be opened by the upward movement of the anchoring hydraulic sliding sleeve is arranged outside the upper anchoring connecting mandrel at the upper end of the anchoring hydraulic sliding sleeve.

The slip assembly can adopt a double-slip assembly, and comprises an upper slip, a cone and a lower slip; an upper limiting ring table is arranged outside the upper end of the upper anchoring connecting mandrel, an upper slip is sleeved on the upper anchoring connecting mandrel at the lower end of the upper limiting ring table, a cone is fixedly arranged on the upper anchoring connecting mandrel at the lower end of the upper slip through a second shearing pin, and the cone is of a fusiform structure with a wide middle and narrow upper and lower ends; the upper anchoring connection mandrel at the lower end of the cone is sleeved with a lower slip; an anchoring pushing connecting ring is fixed at the upper end of the anchoring hydraulic sliding sleeve, and the lower end of the lower slip is seated on the anchoring pushing connecting ring; the outer ring surface of the upper slip is provided with slip teeth, the circumference of the lower part of the upper slip is provided with notches, and the notches divide the lower part of the upper slip into at least two upper clamping tiles; the inner ring surface of each upper clamping tile is a conical surface which can be matched with the upper conical section of the cone, an upper ring conical groove with a downward opening is formed between each upper clamping tile and the upper anchoring connecting mandrel, and the upper end of the upper conical section of the cone is arranged in the lower side of the upper ring conical groove; the upper part of the lower slip is circumferentially distributed with notches which divide the upper part of the lower slip into at least two lower clamping tiles; the inner ring surface of each lower clamping tile is a conical surface which can be matched with the lower conical section of the cone, an upward lower ring conical groove is formed between each lower clamping tile and the upper anchoring connecting mandrel, and the upper end of the lower conical section of the cone is arranged in the upper side of the lower ring conical groove.

The anchoring sliding sleeve anti-retreating mechanism can comprise an anti-retreating ring I; an anti-withdrawal ring mounting groove I is formed in the lower side of the anchoring hydraulic sliding sleeve, and the anti-withdrawal ring I is arranged in the anti-withdrawal ring mounting groove I; the first anti-withdrawal ring is of an open ring or multi-petal combined ring structure, an external tooth with an outer inclined downward is arranged at the outer end of the first anti-withdrawal ring, a limiting latch with an inner inclined upward is arranged in the first anti-withdrawal ring mounting groove, and the external tooth of the first anti-withdrawal ring is meshed with the limiting latch of the first anti-withdrawal ring mounting groove; the lower anchoring connecting mandrel is provided with a tooth segment, the tooth segment of the lower anchoring connecting mandrel is provided with teeth, and an inner inclined downward inner tooth is arranged at one inner end of the anti-back-out ring and is meshed and installed outside the lower side of the tooth segment; radial thread outer holes are circumferentially distributed on the anchoring hydraulic sliding sleeve of the limiting teeth, radial thread blind holes are formed in the first anti-withdrawal ring corresponding to the thread outer holes, and fastening nails are fixedly arranged in the thread outer holes and the thread blind holes through threads.

The lower end of the lower anchoring connecting mandrel is externally provided with a lower stepped ring platform I with a narrow upper part and a wide lower part, the lower end of an anchoring hydraulic sliding sleeve at the lower side of the anti-withdrawal ring mounting groove is provided with a centralizing groove I, and the anchoring hydraulic sliding sleeve is clamped on a narrow diameter section of the lower stepped ring platform I through the centralizing groove I and is fixedly connected together through a first shearing pin.

The rubber tube connecting mandrel can be an upper section of split mandrel and a lower section of split mandrel, and comprises an upper rubber tube connecting mandrel and a lower rubber tube connecting mandrel; the lower end of the upper rubber cylinder connecting mandrel is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower rubber cylinder connecting mandrel through the thread; the upper end of the upper rubber cylinder connecting mandrel is fixedly connected with the outer side of the lower end of the lower anchoring connecting mandrel through threads; the rubber cylinder sealing mechanism comprises a rubber cylinder assembly, a rubber cylinder hydraulic sliding sleeve and a third shearing pin; the rubber cylinder hydraulic sliding sleeve is sleeved outside the lower rubber cylinder connecting mandrel, and a rubber cylinder sliding sleeve anti-retreating mechanism is arranged between the rubber cylinder hydraulic sliding sleeve and the lower rubber cylinder connecting mandrel; the lower end of the rubber cylinder hydraulic sliding sleeve is fixedly arranged outside the lower rubber cylinder connecting mandrel through a third shear pin; a second sealing ring table is arranged in the upper end of the rubber cylinder hydraulic sliding sleeve, and the second sealing ring table is sleeved outside the lower side of the upper rubber cylinder connecting mandrel in a sealing way; a lower hydraulic sealing cavity is formed among the lower rubber cylinder connecting mandrel, the upper rubber cylinder connecting mandrel, the anchoring hydraulic sliding sleeve and the second sealing ring table, and a second pressure transmission hole which can enable an inner hole of the rubber cylinder connecting mandrel to be communicated with the lower hydraulic sealing cavity is formed in the upper rubber cylinder connecting mandrel; and a rubber cylinder assembly capable of pushing the rubber cylinder hydraulic sliding sleeve to carry out upward setting is arranged outside the rubber cylinder connecting mandrel at the upper end of the rubber cylinder hydraulic sliding sleeve.

The rubber cylinder assembly can comprise an upper baffle ring, an upper shoulder pad, an upper auxiliary rubber cylinder, an upper hoop ring, a main rubber cylinder, a lower hoop ring, a lower auxiliary rubber cylinder, a lower shoulder pad and a lower baffle ring; an upper stepped ring table with a wide upper part and a narrow lower part is arranged outside the upper side of the upper rubber cylinder connecting mandrel, threads are arranged outside the narrow section of the upper stepped ring table, and the inner side of the upper end of the upper baffle ring is fixedly arranged with the outer side of the narrow section of the upper stepped ring table through the threads; an upper shoulder pad, an upper auxiliary rubber cylinder, an upper hoop ring, a main rubber cylinder, a lower hoop ring, a lower auxiliary rubber cylinder and a lower shoulder pad are sequentially sleeved outside an upper rubber cylinder connecting mandrel at the lower side of the upper baffle ring; the upper shoulder pad, the upper auxiliary rubber cylinder, the upper hoop, the main rubber cylinder, the lower hoop, the lower auxiliary rubber cylinder and the lower shoulder pad are fixedly connected together in sequence; a lower baffle ring is fixed at the lower end of the lower shoulder pad, and is fixedly arranged outside the upper rubber cylinder connecting mandrel through a fourth shear pin; the upper end of the rubber cylinder hydraulic sliding sleeve is fixedly provided with a rubber cylinder connecting ring, and the lower end of the lower baffle ring is seated on the rubber cylinder connecting ring.

The rubber tube connecting mandrel can be an upper section of split mandrel and a lower section of split mandrel, and comprises an upper rubber tube connecting mandrel and a lower rubber tube connecting mandrel; the lower end of the upper rubber cylinder connecting mandrel is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower rubber cylinder connecting mandrel through the thread; the upper end of the upper rubber cylinder connecting mandrel is fixedly connected with the outer side of the lower end of the lower anchoring connecting mandrel through threads; the rubber cylinder sealing mechanism comprises a rubber cylinder assembly, a rubber cylinder hydraulic sliding sleeve and a third shearing pin; the rubber cylinder hydraulic sliding sleeve is sleeved outside the lower rubber cylinder connecting mandrel, and a rubber cylinder sliding sleeve anti-retreating mechanism is arranged between the rubber cylinder hydraulic sliding sleeve and the lower rubber cylinder connecting mandrel; the lower end of the rubber cylinder hydraulic sliding sleeve is fixedly arranged outside the lower rubber cylinder connecting mandrel through a third shear pin; a second sealing ring table is arranged in the upper end of the rubber cylinder hydraulic sliding sleeve, and the second sealing ring table is sleeved outside the lower side of the upper rubber cylinder connecting mandrel in a sealing way; a lower hydraulic sealing cavity is formed among the lower rubber cylinder connecting mandrel, the upper rubber cylinder connecting mandrel, the rubber cylinder hydraulic sliding sleeve and the sealing ring table II, and a pressure transmission hole II which can enable an inner hole of the rubber cylinder connecting mandrel to be communicated with the lower hydraulic sealing cavity is formed on the upper rubber cylinder connecting mandrel; and a rubber cylinder assembly capable of pushing the rubber cylinder hydraulic sliding sleeve to carry out upward setting is arranged outside the rubber cylinder connecting mandrel at the upper end of the rubber cylinder hydraulic sliding sleeve.

The lower side of the lower rubber cylinder connecting mandrel can be externally provided with a lower stepped annular table II with a narrow upper part and a wide lower part, the lower end of the rubber cylinder hydraulic sliding sleeve is provided with a righting groove II, and the rubber cylinder hydraulic sliding sleeve is clamped on the narrow diameter section of the lower stepped annular table II through the righting groove II and is fixedly connected together through a third shearing pin.

At least one sealing ring is fixedly arranged between the upper anchoring connection mandrel above the upper hydraulic sealing cavity and the first sealing ring table; at least one sealing ring is fixedly arranged between the lower anchoring connecting mandrel below the upper hydraulic sealing cavity and the anchoring hydraulic sliding sleeve; at least one sealing ring is fixedly arranged between the upper rubber cylinder connecting mandrel above the lower hydraulic sealing cavity and the second sealing ring table; at least one sealing ring is fixedly arranged between the rubber cylinder hydraulic sliding sleeve below the lower hydraulic sealing cavity and the lower rubber cylinder connecting mandrel.

The invention has reasonable and compact structure and convenient use; the slip anchoring device and the rubber cylinder sealing device are connected in a detachable mode, so that the slip anchoring device and the rubber cylinder sealing device can be combined and detached according to practical application, multipurpose packing is effectively realized, the application range is wider, and the use is more flexible; the functions of each part of the packer tool are fully exerted, and the manufacturing cost of the packer is reduced.

Drawings

Fig. 1 is a schematic view of a front view and semi-section structure of a preferred embodiment of the present invention.

Fig. 2 is an enlarged schematic view of the structure at I in fig. 1.

Fig. 3 is an enlarged schematic view of the structure at ii in fig. 1.

The codes in the drawings are respectively: 1 is an upper anchoring connecting mandrel, 2 is a lower anchoring connecting mandrel, 3 is an anchoring hydraulic sliding sleeve, 4 is a first shearing pin, 5 is a sealing ring platform I, 6 is an upper hydraulic sealing cavity, 7 is a pressure transmission hole I, 8 is an upper slip, 9 is a cone, 10 is a lower slip, 11 is an upper limiting ring platform, 12 is a second shearing pin, 13 is an anchoring pushing connecting ring, 14 is a fourth shearing pin, 15 is an upper slip sheet, 16 is an upper ring conical groove, 17 is a lower clamping tile, 18 is a lower ring conical groove, 19 is an anti-withdrawal ring I, 20 is a inverted tooth segment, 21 is a limiting clamping tooth, 22 is a tightening pin, 23 is a lower stepped ring platform I, 24 is an upper rubber cylinder connecting mandrel, 25 is a lower rubber cylinder connecting mandrel, 26 is a rubber cylinder hydraulic sliding sleeve, 27 is a third shearing pin, 28 is a sealing ring platform II, 29 is a lower hydraulic sealing cavity, 30 is a pressure transmission hole II, 31 is an upper rubber cylinder platform, 32 is an upper retaining ring, 33 is an upper auxiliary stepped shoulder, 34 is an upper auxiliary stepped ring, 35 is an upper stepped ring, 36 is a main stepped ring, 36 is a lower stepped ring, 37 is a lower stepped ring, 40 is a lower stepped ring, 45 is a lower stepped ring, and 44 is a limiting ring, and is a lower stepped ring, 45 is a sealing ring, and is a lower stepped ring, and is a 45.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.

The invention is further described below with reference to examples and figures:

as shown in fig. 1, the split packer comprises a slip anchor device and a packing element sealing device; the lower end of the slip anchoring device and the upper end of the rubber cylinder sealing device are fixedly installed together in a detachable mode.

The slip anchoring device can adopt the prior known device capable of realizing the slip anchoring function, the rubber cylinder sealing device can adopt the prior known device capable of realizing the setting function, and the slip anchoring device and the rubber cylinder sealing device are connected in a detachable manner and can be combined or detached according to the actual application requirement; the specific use is as follows:

When the packer is used for packing between an oil pipe and a casing pipe, the packer combined together can be directly put in to ensure that the sealing of a rubber sleeve and the anchoring of a slip are simultaneously acted, so that the packing purpose is achieved;

When the sealing device is used for sealing between a casing and a borehole, the slip anchoring device and the rubber sleeve sealing device can be detached, redundant parts of the slip anchoring device are removed, and the sealing between the casing and the borehole can be achieved by only lowering a module part of the rubber sleeve sealing device;

Due to the adoption of the detachable modularized structure, the packer can be combined and detached according to practical application, so that the multipurpose packing is effectively realized, the application range is wider, and the use is more flexible; the functions of each part of the packer tool are fully exerted, and the manufacturing cost of the packer is reduced.

The split packer can be further optimized or/and improved according to actual needs:

As shown in fig. 1, the slip anchoring device comprises an anchoring connection mandrel and a slip anchoring mechanism; the rubber cylinder sealing device comprises a rubber cylinder connecting mandrel and a rubber cylinder sealing mechanism; the lower end of the anchoring connection mandrel and the upper end of the rubber cylinder connection mandrel are fixedly installed together through threads. The threaded connection is adopted, so that the connection strength can be ensured, and the tightness of the connection part can be ensured; the disassembly and the assembly are convenient and reliable, and the operation is simpler, more convenient and more efficient.

As shown in fig. 1, the anchoring connection mandrel is an upper-lower two-section split mandrel and comprises an upper anchoring connection mandrel 1 and a lower anchoring connection mandrel 2; the lower end of the upper anchoring connecting mandrel 1 is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower anchoring connecting mandrel 2 through the thread; the outer part of the lower end of the lower anchoring connecting mandrel 2 is fixedly arranged with the inner part of the upper end of the rubber cylinder connecting mandrel through threads; the slip anchoring mechanism comprises a slip assembly, an anchoring hydraulic sliding sleeve 3 and a first shear pin 4; the anchoring hydraulic sliding sleeve 3 is sleeved on the lower anchoring connecting mandrel 2, and an anchoring sliding sleeve anti-retreating mechanism is arranged between the anchoring hydraulic sliding sleeve 3 and the lower anchoring connecting mandrel 2; the lower end of the anchoring hydraulic sliding sleeve 3 is fixedly arranged outside the lower anchoring connecting mandrel 2 through a first shear pin 4; the upper end of the anchoring hydraulic sliding sleeve 3 is provided with a first sealing ring table 5, and the first sealing ring table 5 is sleeved outside the lower side of the upper anchoring connecting mandrel 1 in a sealing way; an upper hydraulic sealing cavity 6 is formed among the lower anchoring connecting mandrel 2, the upper anchoring connecting mandrel 1, the anchoring hydraulic sliding sleeve 3 and the first sealing ring platform 5, and a first pressure transmission hole 7 which can enable an inner hole of the anchoring connecting mandrel to be communicated with the upper hydraulic sealing cavity 6 is formed on the upper anchoring connecting mandrel 1; the slip assembly which can be pushed to be opened by the upward movement of the anchoring hydraulic sliding sleeve 3 is arranged outside the upper anchoring connecting mandrel 1 at the upper end of the anchoring hydraulic sliding sleeve 3. The upper and lower two-section split type mandrel structure is more convenient for dismounting the slip assembly and the anchoring hydraulic sliding sleeve 3; when the hydraulic sleeve is used, through the pressure built-in oil pipe, the slip assembly is opened under the upward thrust action of the anchoring hydraulic sliding sleeve 3, the inner wall of the sleeve is clamped, creep and failure of the rubber cylinder sealing device after the expansion and the packing of the rubber cylinder are limited, the anchoring action is realized, and the operation is convenient and reliable.

As shown in fig. 1, the slip assembly adopts a double slip assembly, and comprises an upper slip 8, a cone 9 and a lower slip 10; an upper limiting ring table 11 is arranged outside the upper end of the upper anchoring connecting mandrel 1, an upper slip 8 is sleeved on the upper anchoring connecting mandrel 1 at the lower end of the upper limiting ring table 11, a cone 9 is fixedly arranged on the upper anchoring connecting mandrel 1 at the lower end of the upper slip 8 through a second shear pin 12, and the cone 9 is of a fusiform structure with a wide middle and narrow upper and lower ends; the upper anchoring connection mandrel 1 at the lower end of the cone 9 is sleeved with a lower slip 10; an anchoring pushing connecting ring 13 is fixed at the upper end of the anchoring hydraulic sliding sleeve 3, and the lower end of the lower slip 10 is seated on the anchoring pushing connecting ring 13; the outer ring surface of the upper slip 8 is provided with slip teeth, the lower part of the upper slip 8 is provided with circumferentially distributed notches, and the notches divide the lower part of the upper slip 8 into at least two upper slip sheets 15; the inner annular surface of each upper slip sheet 15 is a conical surface which can be matched with the upper conical section of the cone 9, an upper annular conical groove 16 with a downward opening is formed between each upper slip sheet and the upper anchoring connection mandrel 1, and the upper end of the upper conical section of the cone 9 is arranged in the lower side of the upper annular conical groove 16; cutouts circumferentially distributed in the upper portion of the lower slips 10, the cutouts dividing the upper portion of the lower slips 10 into at least two lower slip segments 17; the inner ring surface of each lower slip piece 17 is a conical surface which can be matched with the lower cone section of the cone 9, a lower ring cone groove 18 with an upward opening is formed between the inner ring surface and the upper anchoring connection mandrel 1, and the upper end of the lower cone section of the cone 9 is arranged in the upper side of the lower ring cone groove 18. The double-slip assembly adopted by the packer has better anchoring effect.

As shown in fig. 1 and 2, the anchoring sliding sleeve anti-back mechanism comprises an anti-back ring I19; an anti-withdrawal ring mounting groove I is arranged in the lower side of the anchoring hydraulic sliding sleeve 3, and an anti-withdrawal ring I19 is arranged in the anti-withdrawal ring mounting groove I; the first anti-withdrawal ring 19 is of an open ring or multi-petal combined ring structure, the outer end of the first anti-withdrawal ring 19 is provided with external teeth which are outwards inclined downwards, the first anti-withdrawal ring mounting groove is internally provided with limiting latch teeth 21 which are inwards inclined upwards, and the external teeth of the first anti-withdrawal ring 19 are meshed with the limiting latch teeth 21 of the first anti-withdrawal ring mounting groove; the lower anchoring connection mandrel 2 is externally provided with a tooth segment 20, the tooth segment 20 of the lower anchoring connection mandrel 2 is externally provided with teeth, the inner end of the anti-withdrawal ring I19 is provided with inner teeth which are inwards inclined downwards, and the inner teeth are meshed and installed outside the lower side of the tooth segment 20; radial thread outer holes are circumferentially distributed on the anchoring hydraulic sliding sleeve 3 of the limiting teeth 21, radial thread blind holes are formed in the anti-withdrawal ring 19 corresponding to the thread outer holes, and fastening nails 22 are fixedly arranged in the thread outer holes and the thread blind holes through threads. Wherein, the first anti-withdrawal ring 19 is of an open ring or multi-petal combined ring structure, and is based on the installation and use requirements; during installation, the first anti-withdrawal ring 19 is buckled at the lower end of the inverted tooth section 20, then the anchoring hydraulic sliding sleeve 3 is sleeved to the limiting latch 21 from top to bottom to be engaged and clamped on the external teeth, and the nails 22 are tightened; when the anti-backing-up device is used, the first anti-backing-up ring 19 moves upwards along the inverted tooth section 20 along with the anchoring hydraulic sliding sleeve 3, inverted teeth outside the inverted tooth section 20 of the lower anchoring connecting mandrel 2 and internal teeth of the first anti-backing-up ring 19 can be meshed with each other, and the anti-backing-up function is achieved; the limiting latch 21 on the anchoring hydraulic sliding sleeve 3 is meshed with the external teeth of the first anti-backing ring 19, so that the hydraulic sliding sleeve and the first anti-backing ring 19 can be axially limited; the axial limit is adopted in a tooth-to-tooth meshing mode, so that the bearing contact surface between the anchoring hydraulic sliding sleeve 3 and the first anti-withdrawal ring 19 can be increased, and the bearing effect is improved; the main function of the fastening nail 22 is to fasten the first anti-back ring 19 inwards, so that the inner teeth of the first anti-back ring 19 and the inverted teeth of the inverted tooth section 20 can be effectively meshed, and the anti-back reliability is improved.

As shown in fig. 1 and 2, a lower stepped ring table 23 with a narrow upper part and a wide lower part is arranged outside the lower end of a lower anchoring connection mandrel 2, a centralizing groove I is arranged at the lower end of an anchoring hydraulic sliding sleeve 3 at the lower side of an anti-withdrawal ring mounting groove, and the anchoring hydraulic sliding sleeve 3 is clamped on a narrow diameter section of the lower stepped ring table 23 through the centralizing groove I and is fixedly connected together through a first shearing pin 4. The lower step ring platform one 23 plays a role in bearing and limiting the anchoring hydraulic sliding sleeve 3; secondly, the anchoring hydraulic sliding sleeve 3 is centered during installation.

As shown in fig. 1, the rubber tube connecting mandrel is an upper section of split mandrel and a lower section of split mandrel, and comprises an upper rubber tube connecting mandrel 24 and a lower rubber tube connecting mandrel 25; the lower end of the upper rubber tube connecting mandrel 24 is externally provided with threads, and is fixedly connected with the inner side of the upper end of the lower rubber tube connecting mandrel 25 through the threads; the upper end of the upper rubber cylinder connecting mandrel 24 is fixedly connected with the lower end of the lower anchoring connecting mandrel 2 through threads; the rubber cylinder sealing mechanism comprises a rubber cylinder assembly, a rubber cylinder hydraulic sliding sleeve 26 and a third shear pin 27; the rubber cylinder hydraulic sliding sleeve 26 is sleeved outside the lower rubber cylinder connecting mandrel 25, and a rubber cylinder sliding sleeve anti-retreating mechanism is arranged between the rubber cylinder hydraulic sliding sleeve 26 and the lower rubber cylinder connecting mandrel 25; the lower end of the rubber cylinder hydraulic sliding sleeve 26 is fixedly arranged outside the lower rubber cylinder connecting mandrel 25 through a third shear pin 27; a second sealing ring table 28 is arranged in the upper end of the rubber cylinder hydraulic sliding sleeve 26, and the second sealing ring table 28 is sleeved outside the lower side of the upper rubber cylinder connecting mandrel 24 in a sealing way; a lower hydraulic sealing cavity 29 is formed among the lower rubber tube connecting mandrel 25, the upper rubber tube connecting mandrel 24, the rubber tube hydraulic sliding sleeve 26 and the second sealing ring table 28, and a second pressure transmission hole 30 which can enable the inner hole of the rubber tube connecting mandrel to be communicated with the lower hydraulic sealing cavity 29 is formed on the upper rubber tube connecting mandrel 24; and a rubber cylinder assembly capable of pushing the rubber cylinder hydraulic sliding sleeve 26 to up and seal is arranged outside the rubber cylinder connecting mandrel 24 at the upper end of the rubber cylinder hydraulic sliding sleeve 26. The structure of the split type mandrel with the upper section and the lower section is more convenient for dismounting the rubber cylinder assembly and the rubber cylinder hydraulic sliding sleeve 26; when the sealing device is used, the pressure is suppressed in the oil pipe, the rubber cylinder assembly is opened under the upward thrust action of the rubber cylinder hydraulic sliding sleeve 26, and the rubber cylinder assembly is sealed, so that sealing is realized; simple structure, convenient and reliable operation. Further improving the service performance of the packer.

As shown in fig. 1, the rubber cylinder assembly comprises an upper baffle ring 32, an upper shoulder pad 33, an upper auxiliary rubber cylinder 34, an upper hoop 35, a main rubber cylinder 36, a lower hoop 37, a lower auxiliary rubber cylinder 38, a lower shoulder pad 39 and a lower baffle ring 40; an upper stepped ring table 31 with a wide upper part and a narrow lower part is arranged outside the upper side of the upper rubber cylinder connecting mandrel 24, threads are arranged outside the narrow section of the upper stepped ring table 31, and the inner side of the upper end of the upper baffle ring 32 and the outer side of the narrow section of the upper stepped ring table 31 are fixedly arranged together through the threads; an upper shoulder pad 33, an upper auxiliary rubber tube 34, an upper hoop 35, a main rubber tube 36, a lower hoop 37, a lower auxiliary rubber tube 38 and a lower shoulder pad 39 are sequentially sleeved outside the upper rubber tube connecting mandrel 24 at the lower side of the upper baffle ring 32; the upper shoulder pad 33, the upper auxiliary rubber cylinder 34, the upper hoop 35, the main rubber cylinder 36, the lower hoop 37, the lower auxiliary rubber cylinder 38 and the lower shoulder pad 39 are fixedly connected together in sequence; a lower baffle ring 40 is fixed at the lower end of the lower shoulder pad 39, and the lower baffle ring 40 is fixedly arranged outside the upper rubber cylinder connecting mandrel 24 through a fourth shear pin 14; a rubber connecting ring 41 is fixed at the upper end of the rubber hydraulic sliding sleeve 26, and the lower end of the lower baffle ring 40 is seated on the rubber connecting ring 41. Wherein, the fourth shear pin 14 locks the lower baffle ring 40, which can effectively avoid the rubber cylinder assembly from being set in advance.

As shown in fig. 1 and 3, the anti-back mechanism of the rubber sleeve sliding sleeve comprises an anti-back ring II 42; a second anti-withdrawal ring mounting groove is formed in the lower side of the rubber cylinder hydraulic sliding sleeve 26, a second anti-withdrawal ring 42 is arranged in the second anti-withdrawal ring mounting groove, an inner inclined upward rubber cylinder sliding sleeve limiting tooth 44 is arranged in the second anti-withdrawal ring mounting groove, an outer inclined downward outer tooth is arranged at the outer end of the first anti-withdrawal ring 19 corresponding to the rubber cylinder sliding sleeve limiting tooth 44, and the rubber cylinder sliding sleeve limiting tooth 44 is engaged with and limited with the outer tooth of the first anti-withdrawal ring 19; the lower rubber tube connecting mandrel 25 is provided with a rubber tube inverted tooth section 43, inverted teeth are arranged outside the rubber tube inverted tooth section 43, inner inclined downward inner teeth are arranged at the inner end of the second withdrawal ring 42, and the inner teeth are meshed and installed outside the lower side of the rubber tube inverted tooth section 43; the middle part of the rubber cylinder hydraulic sliding sleeve 26 is provided with a radial thread outer hole, a second anti-withdrawal ring 42 corresponding to the threaded hole is provided with a thread blind hole, and the screw 22 is fixedly arranged in the thread outer hole and the thread blind hole through threads. The action principle and the action effect of the rubber sleeve sliding sleeve anti-return mechanism are the same as those of the anchoring sliding sleeve anti-return mechanism, and the rubber sleeve sliding sleeve anti-return mechanism has the anti-return function.

As shown in fig. 1 and 3, a second stepped ring table 45 with a narrow upper part and a wide lower part is arranged outside the lower side of the lower rubber cylinder connecting mandrel 25, a second centralizing groove is arranged at the lower end of the rubber cylinder hydraulic sliding sleeve 26, and the rubber cylinder hydraulic sliding sleeve 26 is clamped on the narrow diameter section of the second stepped ring table 45 through the second centralizing groove and is fixedly connected together through a third shearing pin 27. Wherein, the lower step ring platform II 45 plays a role of bearing and limiting the rubber cylinder hydraulic sliding sleeve 26; secondly, during installation, the hydraulic sliding sleeve 26 of the rubber cylinder is centered.

As shown in fig. 1, to further increase the tightness between the contact surfaces, at least one sealing ring 46 is fixedly installed between the upper anchoring connection mandrel 1 and the first sealing ring platform 5 above the upper hydraulic sealing cavity 6; at least one sealing ring 46 is fixedly arranged between the lower anchoring connecting mandrel 2 and the anchoring hydraulic sliding sleeve 3 below the upper hydraulic sealing cavity 6; at least one sealing ring 46 is fixedly arranged between the upper rubber cylinder connecting mandrel 24 and the second sealing ring table 28 above the lower hydraulic sealing cavity 29. A sealing ring is fixedly arranged between the rubber cylinder hydraulic sliding sleeve 26 below the lower hydraulic sealing cavity 29 and the lower rubber cylinder connecting mandrel 25.

The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.

Use state 1: the optimal embodiment of the invention is used for the packing process between the oil pipe and the casing pipe:

The anchor hydraulic sliding sleeve 3 and the rubber cylinder hydraulic sliding sleeve 26 are respectively subjected to axial thrust, when the axial thrust is increased so that the axial thrust is greater than the shearing limit of the first shearing pin 4 and the third shearing pin 27, the first shearing pin 4 and the third shearing pin 27 are sheared simultaneously, the anchor hydraulic sliding sleeve 3 and the rubber cylinder hydraulic sliding sleeve 26 axially move together to push the lower slips 10 to move upwards along the conical surface of the cone 9, shear damage occurs to the second shearing pin 12 in the process, the conical surface of the cone 9 starts to squeeze the inner conical surface of the upper slips 8, and the lower slips 10 open outwards to deform under the pushing force of the anchor hydraulic sliding sleeve 3, so that the upper slips 15 and the lower slips 17 are anchored; when the slip anchoring device is anchored, the rubber cylinder hydraulic sliding sleeve 26 and the rubber cylinder connecting ring 41 move upwards and axially, and when the thrust reaches a certain value, the fourth shearing pin 14 is sheared and damaged, the lower baffle ring 40 starts to push the lower auxiliary rubber cylinder 38, the main rubber cylinder 36 and the upper auxiliary rubber cylinder 34 under the thrust action of the rubber cylinder hydraulic sliding sleeve 26, and the lower auxiliary rubber cylinder 38, the main rubber cylinder 36 and the upper auxiliary rubber cylinder 34 are compressed and outwards raised under the pushing force of the lower baffle ring 40, so that setting is realized; wherein, the first anti-back-out ring 19 and the second anti-back-out ring 42 keep the slips and the rubber barrel in an anchoring setting state.

Use state 2: the preferred embodiment of the invention is used in the packing process between the casing and the borehole:

The slip anchoring device is removed in advance, and only the rubber sealing device is used as a packing tool to be placed in a designated position, and the using process of the rubber sealing device is the same as that of the rubber sealing device used in the packing process between the oil pipe and the casing.

Claims

1. The split packer is characterized by comprising a slip anchoring device and a rubber cylinder sealing device; the lower end of the slip anchoring device and the upper end of the rubber cylinder sealing device are fixedly installed together in a detachable mode, and the slip anchoring device comprises an anchoring connection mandrel and a slip anchoring mechanism; the rubber cylinder sealing device comprises a rubber cylinder connecting mandrel and a rubber cylinder sealing mechanism; the lower end of the anchoring connecting mandrel is externally provided with threads, the upper end of the rubber barrel connecting mandrel is internally provided with threads, the outer side of the lower end of the anchoring connecting mandrel and the upper end of the rubber barrel connecting mandrel are fixedly installed together through threads, and the anchoring connecting mandrel is an upper-lower split type mandrel and comprises an upper anchoring connecting mandrel and a lower anchoring connecting mandrel; the lower end of the upper anchoring connecting mandrel is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower anchoring connecting mandrel through the thread; the outer part of the lower end of the lower anchoring connecting mandrel is fixedly arranged with the inner part of the upper end of the rubber cylinder connecting mandrel through threads; the slip anchoring mechanism comprises a slip assembly, an anchoring hydraulic sliding sleeve and a first shearing pin; the anchoring hydraulic sliding sleeve is sleeved on the lower anchoring connecting mandrel, and an anchoring sliding sleeve anti-retreating mechanism is arranged between the anchoring hydraulic sliding sleeve and the lower anchoring connecting mandrel; the lower end of the anchoring hydraulic sliding sleeve is fixedly arranged outside the lower anchoring connecting mandrel through a first shear pin; the upper end of the anchoring hydraulic sliding sleeve is provided with a first sealing ring table, and the first sealing ring table is sleeved outside the lower side of the upper anchoring connecting mandrel in a sealing way; an upper hydraulic sealing cavity is formed among the lower anchoring connecting mandrel, the upper anchoring connecting mandrel, the anchoring hydraulic sliding sleeve and the first sealing ring table, and a pressure transmission hole I which can enable an inner hole of the anchoring connecting mandrel to be communicated with the upper hydraulic sealing cavity is formed on the upper anchoring connecting mandrel; the upper anchoring connecting mandrel at the upper end of the anchoring hydraulic sliding sleeve is externally provided with a slip assembly which can be pushed to open by the upper anchoring hydraulic sliding sleeve, and the slip assembly adopts a double slip assembly and comprises an upper slip, a cone and a lower slip; an upper limiting ring table is arranged outside the upper end of the upper anchoring connecting mandrel, an upper slip is sleeved on the upper anchoring connecting mandrel at the lower end of the upper limiting ring table, a cone is fixedly arranged on the upper anchoring connecting mandrel at the lower end of the upper slip through a second shearing pin, and the cone is of a fusiform structure with a wide middle and narrow upper and lower ends; the upper anchoring connection mandrel at the lower end of the cone is sleeved with a lower slip; an anchoring pushing connecting ring is fixed at the upper end of the anchoring hydraulic sliding sleeve, and the lower end of the lower slip is seated on the anchoring pushing connecting ring; the outer ring surface of the upper slip is provided with slip teeth, the circumference of the lower part of the upper slip is provided with notches, and the notches divide the lower part of the upper slip into at least two upper clamping tiles; the inner ring surface of each upper clamping tile is a conical surface which can be matched with the upper conical section of the cone, an upper ring conical groove with a downward opening is formed between each upper clamping tile and the upper anchoring connecting mandrel, and the upper end of the upper conical section of the cone is arranged in the lower side of the upper ring conical groove; the upper part of the lower slip is circumferentially distributed with notches which divide the upper part of the lower slip into at least two lower clamping tiles; the inner ring surface of each lower clamping tile is a conical surface which can be matched with the lower conical section of the cone, an upward lower ring conical groove is formed between each lower clamping tile and the upper anchoring connecting mandrel, and the upper end of the lower conical section of the cone is arranged in the upper side of the lower ring conical groove.

2. The split packer of claim 1, wherein the anchoring sleeve anti-backup mechanism comprises an anti-backup ring one; an anti-withdrawal ring mounting groove I is formed in the lower side of the anchoring hydraulic sliding sleeve, and the anti-withdrawal ring I is arranged in the anti-withdrawal ring mounting groove I; the first anti-withdrawal ring is of an open ring or multi-petal combined ring structure, an external tooth with an outer inclined downward is arranged at the outer end of the first anti-withdrawal ring, a limiting latch with an inner inclined upward is arranged in the first anti-withdrawal ring mounting groove, and the external tooth of the first anti-withdrawal ring is meshed with the limiting latch of the first anti-withdrawal ring mounting groove; the lower anchoring connecting mandrel is provided with a tooth segment, the tooth segment of the lower anchoring connecting mandrel is provided with teeth, and an inner inclined downward inner tooth is arranged at one inner end of the anti-back-out ring and is meshed and installed outside the lower side of the tooth segment; radial thread outer holes are circumferentially distributed on the anchoring hydraulic sliding sleeve of the limiting teeth, radial thread blind holes are formed in the first anti-withdrawal ring corresponding to the thread outer holes, and fastening nails are fixedly arranged in the thread outer holes and the thread blind holes through threads.

3. The split packer of claim 2, wherein a lower stepped ring table I with a narrow upper part and a wide lower part is arranged outside the lower end of the lower anchoring connection mandrel, a centralizing groove I is arranged at the lower end of an anchoring hydraulic sliding sleeve at the lower side of the anti-withdrawal ring installation groove, and the anchoring hydraulic sliding sleeve is clamped on a narrow diameter section of the lower stepped ring table I through the centralizing groove I and is fixedly connected together through a first shearing pin.

4. The split packer according to claim 1, 2 or 3, wherein the packing element connecting mandrel is an upper split mandrel and a lower split mandrel, and comprises an upper packing element connecting mandrel and a lower packing element connecting mandrel; the lower end of the upper rubber cylinder connecting mandrel is externally provided with a thread, and is fixedly connected with the inner side of the upper end of the lower rubber cylinder connecting mandrel through the thread; the upper end of the upper rubber cylinder connecting mandrel is fixedly connected with the outer side of the lower end of the lower anchoring connecting mandrel through threads; the rubber cylinder sealing mechanism comprises a rubber cylinder assembly, a rubber cylinder hydraulic sliding sleeve and a third shearing pin; the rubber cylinder hydraulic sliding sleeve is sleeved outside the lower rubber cylinder connecting mandrel, and a rubber cylinder sliding sleeve anti-retreating mechanism is arranged between the rubber cylinder hydraulic sliding sleeve and the lower rubber cylinder connecting mandrel; the lower end of the rubber cylinder hydraulic sliding sleeve is fixedly arranged outside the lower rubber cylinder connecting mandrel through a third shear pin; a second sealing ring table is arranged in the upper end of the rubber cylinder hydraulic sliding sleeve, and the second sealing ring table is sleeved outside the lower side of the upper rubber cylinder connecting mandrel in a sealing way; a lower hydraulic sealing cavity is formed among the lower rubber cylinder connecting mandrel, the upper rubber cylinder connecting mandrel, the anchoring hydraulic sliding sleeve and the second sealing ring table, and a second pressure transmission hole which can enable an inner hole of the rubber cylinder connecting mandrel to be communicated with the lower hydraulic sealing cavity is formed in the upper rubber cylinder connecting mandrel; and a rubber cylinder assembly capable of pushing the rubber cylinder hydraulic sliding sleeve to carry out upward setting is arranged outside the rubber cylinder connecting mandrel at the upper end of the rubber cylinder hydraulic sliding sleeve.

5. The split packer of claim 4, wherein the packing element assembly comprises an upper stop ring, an upper shoulder pad, an upper auxiliary packing element, an upper hoop ring, a main packing element, a lower hoop ring, a lower auxiliary packing element, a lower shoulder pad, and a lower stop ring; an upper stepped ring table with a wide upper part and a narrow lower part is arranged outside the upper side of the upper rubber cylinder connecting mandrel, threads are arranged outside the narrow section of the upper stepped ring table, and the inner side of the upper end of the upper baffle ring is fixedly arranged with the outer side of the narrow section of the upper stepped ring table through the threads; an upper shoulder pad, an upper auxiliary rubber cylinder, an upper hoop ring, a main rubber cylinder, a lower hoop ring, a lower auxiliary rubber cylinder and a lower shoulder pad are sequentially sleeved outside an upper rubber cylinder connecting mandrel at the lower side of the upper baffle ring; the upper shoulder pad, the upper auxiliary rubber cylinder, the upper hoop, the main rubber cylinder, the lower hoop, the lower auxiliary rubber cylinder and the lower shoulder pad are fixedly connected together in sequence; a lower baffle ring is fixed at the lower end of the lower shoulder pad, and is fixedly arranged outside the upper rubber cylinder connecting mandrel through a fourth shear pin; the upper end of the rubber cylinder hydraulic sliding sleeve is fixedly provided with a rubber cylinder connecting ring, and the lower end of the lower baffle ring is seated on the rubber cylinder connecting ring.

6. The split packer of claim 5, wherein the packing element sliding sleeve anti-back mechanism comprises an anti-back ring two; an anti-withdrawal ring mounting groove is formed in the lower side of the rubber cylinder hydraulic sliding sleeve, the anti-withdrawal ring II is arranged in the anti-withdrawal ring mounting groove, inner oblique upward rubber cylinder sliding sleeve limiting teeth are arranged in the anti-withdrawal ring mounting groove, outer oblique downward outer teeth are arranged at the outer end of the anti-withdrawal ring I corresponding to the rubber cylinder sliding sleeve limiting teeth, and the rubber cylinder sliding sleeve limiting teeth are engaged with the outer teeth of the anti-withdrawal ring I for limiting; the lower rubber tube connecting mandrel is provided with a rubber tube inverted tooth section, inverted teeth are arranged outside the rubber tube inverted tooth section, inner inclined downward inner teeth are arranged at the inner end of the backing ring II, and the inner teeth are meshed and installed outside the lower side of the rubber tube inverted tooth section; radial thread outer holes are formed in the middle of the rubber cylinder hydraulic sliding sleeve, thread blind holes are formed in the anti-withdrawal ring II corresponding to the threaded holes, and fastening nails are fixedly arranged in the thread outer holes and the thread blind holes through threads.

7. The split packer of claim 6, wherein a lower stepped ring platform II with a narrow upper part and a wide lower part is arranged outside the lower side of the lower rubber cylinder connecting mandrel, a centralizing groove II is arranged at the lower end of the rubber cylinder hydraulic sliding sleeve, and the rubber cylinder hydraulic sliding sleeve is clamped on a narrow diameter section of the lower stepped ring platform II through the centralizing groove II and is fixedly connected together through a third shearing pin; or/and at least one sealing ring is fixedly arranged between the upper anchoring connecting mandrel above the upper hydraulic sealing cavity and the first sealing ring table; at least one sealing ring is fixedly arranged between the lower anchoring connecting mandrel below the upper hydraulic sealing cavity and the anchoring hydraulic sliding sleeve; at least one sealing ring is fixedly arranged between the upper rubber cylinder connecting mandrel above the lower hydraulic sealing cavity and the second sealing ring table; at least one sealing ring is fixedly arranged between the rubber cylinder hydraulic sliding sleeve below the lower hydraulic sealing cavity and the lower rubber cylinder connecting mandrel.