CN219864936U

CN219864936U - Packer for underground well closing

Info

Publication number: CN219864936U
Application number: CN202321354863.XU
Authority: CN
Inventors: 朱玉刚
Original assignee: Sichuan Cccc Xinneng Technology Co ltd
Current assignee: Sichuan Cccc Xinneng Technology Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-10-20
Anticipated expiration: 2033-05-31

Abstract

The utility model relates to the technical field of packers and discloses a packer for underground well closing, which comprises an upper connecting pipe and a clamp sleeve, wherein one end of the clamp sleeve is coaxially fixed with a sealing pipe, the outer wall of the sealing pipe is provided with threads, the upper connecting pipe is sleeved on the sealing pipe in a threaded manner, a plurality of sealing rubber barrels are sleeved on the sealing pipe along the axial direction of the sealing pipe, the sealing rubber barrels are positioned between the upper connecting pipe and the clamp sleeve, one end of the upper connecting pipe, which is far away from the clamp sleeve, is provided with an internal threaded hole, and the screwing direction of the threads of the internal threaded hole is identical with that of the external threads of the sealing pipe. The pipe is internally sealed in a thread locking mode, so that the sealing strength is improved, and meanwhile, the connection mode of threads is convenient to detach, so that the packer has a recovery function.

Description

Packer for underground well closing

Technical Field

The utility model relates to the technical field of packers, in particular to a packer for underground well closing.

Background

The packer is used for sealing annulus and separating production intervals to control injection or extraction of fluid and can bear pressure difference of downhole tools so as to meet the requirements of production and measure operation and provide safety guarantee for production, thus being widely applied to various oil field development operations such as well completion, fracturing, acidification, water injection, oil test and the like. With the increasing number of deep wells and ultra-deep wells in oil and gas exploration and exploitation, the pressure and temperature change greatly in the production process of high-temperature and high-pressure deep wells, especially under the alternate change of working conditions such as perforation, fracturing, well closing, well opening and the like, once the underground packer moves, the well completion efficiency can be greatly reduced, and the risks of well completion pipe column damage and well shaft blowby are increased. How to make the packer have stronger sealing performance, but also have the recovery function of recoverable packer simultaneously, it is important to the completion operation of high-pressure well especially.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides the packer for underground well closing, which is used for sealing in a pipe in a thread locking mode, so that the sealing strength is improved, and meanwhile, the connection mode of threads is convenient to detach, so that the packer has a recovery function.

The aim of the utility model is realized by the following technical scheme: the utility model provides a packer for closing well in pit, is including last takeover and a clamp section of thick bamboo, the one end coaxial fixation of a clamp section of thick bamboo has the seal tube, the outer wall of seal tube is equipped with the screw thread, go up takeover thread suit and be in on the seal tube, it is equipped with a plurality of seal rubber barrels to follow self axial cover on the seal tube, seal rubber barrel is located go up between takeover and the clamp section of thick bamboo, go up takeover and keep away from the internal thread hole has been seted up to the one end of a clamp section of thick bamboo, the screw thread of internal thread hole revolve to with the external screw thread of seal tube revolves to the same, the internal thread hole internal thread adaptation has the end cap, the end cap is used for connecting outside tubular column.

The technical scheme has the advantages that the pipe is sealed in a threaded locking mode, the sealing strength is improved, and meanwhile, the threaded connection mode is convenient to detach, so that the packer has a recovery function.

In some embodiments, the internal bore of the upper adapter communicates with the internally threaded bore, and the internal bore diameter of the upper adapter is smaller than the diameter of the internally threaded bore.

In some embodiments, a diversion cavity is arranged in the slip barrel, the diversion cavity penetrates through two ends of the slip barrel, a plurality of mounting grooves are formed in the side wall of the slip barrel, the mounting grooves are uniformly distributed along the circumference of the slip barrel, friction blocks are arranged in the mounting grooves in a sliding mode, and the friction blocks move along the radial direction of the slip barrel.

In some embodiments, the upper end surface of the friction block is provided with a wedge surface, the lower end of the wedge surface is arranged close to the axis of the slip barrel, an abutting barrel is arranged in the slip barrel, the abutting barrel moves along the axial direction of the slip barrel, and the wedge surface is positioned on the moving path of the abutting barrel.

In some embodiments, a disc is fixed at one end of the friction block, which is close to the axis of the slip cylinder, a return spring is arranged between the disc and the inner wall of the slip cylinder, and two ends of the return spring are respectively connected with the disc and the slip cylinder.

In some embodiments, the inner cavity of the sealing tube is provided with an internal thread, the outer wall of the abutting tube is provided with an external thread, the abutting tube is in threaded connection with the sealing tube, and one end of the abutting tube, which is close to the upper connecting tube, is provided with a threaded hole.

In some embodiments, the abutment cylinder has an inner cavity diameter that is smaller than the diameter of the threaded bore.

In some embodiments, the friction block is provided with a plurality of friction teeth at an end remote from the tile cylinder, the friction teeth being equally spaced along the radial direction of the tile cylinder.

The beneficial effects of the utility model are as follows:

1. the pipe is internally sealed in a thread locking mode, so that the sealing strength is improved, and meanwhile, the connection mode of threads is convenient to detach, so that the packer has a recovery function.

2. The friction block is ejected out of the slip barrel through the abutting barrel, the friction block is abutted against the stratum of the oil hole, so that the position of the packer is locked, the abutting barrel moves in a threaded mode to push the friction block, the abutting barrel can lock the position of the friction block with high strength, the situation of falling is avoided, and the recovery of the packer is facilitated.

Drawings

FIG. 1 is a schematic illustration of the internal structure of a packer for downhole well shut-in according to the present utility model;

FIG. 2 is a diagram of an unset condition of a packer for use in a downhole shut-in of the present utility model;

FIG. 3 is a seal state diagram of a packer for downhole shut-in according to the present utility model;

in the figure, the device comprises a 1-upper connecting pipe, a 2-clamp cylinder, a 3-sealing pipe, a 4-sealing rubber cylinder, a 5-internal threaded hole, a 6-flow guiding cavity, a 7-mounting groove, an 8-friction block, a 9-wedge surface, a 10-abutting cylinder, an 11-disc, a 12-return spring, a 13-threaded hole, 14-friction teeth and a 15-plug.

Detailed Description

The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.

As shown in fig. 1 to 3, a packer for downhole well closing comprises an upper connecting pipe 1 and a slip barrel 2, wherein one end of the slip barrel 2 is coaxially fixed with a sealing pipe 3, the outer wall of the sealing pipe 3 is provided with threads, the upper connecting pipe 1 is sleeved on the sealing pipe 3 by threads, a plurality of sealing rubber barrels 4 are axially sleeved on the sealing pipe 3 along the self-axial direction, the sealing rubber barrels 4 are positioned between the upper connecting pipe 1 and the slip barrel 2, one end of the upper connecting pipe 1, which is far away from the slip barrel 2, is provided with an internal threaded hole 5, the screwing direction of the threads of the internal threaded hole 5 is the same as the screwing direction of the external threads of the sealing pipe 3, the internal threads of the internal threaded hole 5 are matched with a plug 15, the plug 15 is used for connecting an external pipe column, the plug 15 is removed to enable the inner cavity of the packer to normally circulate media, well closing operation or sealing annular space is needed to be carried out in emergency, the packer is fixed at a designated position of an oil hole by the slip barrel 2, the top of the plug 15 is fixedly provided with a connecting rod, when in sealing, the pipe column is connected with the connecting rod, the plug 15 is driven by the pipe column to extend into the internal threaded hole 5, so that the plug 15 is adapted to the internal threaded hole 5, the inner cavity of the packer is sealed by the plug 15, the pipe is sealed in a threaded locking mode, the sealing strength is improved, meanwhile, the plug 15 moves close to the tile cylinder 2, the upper connecting pipe 1 and the sealing pipe 3 are connected in a threaded mode, the sealing rubber cylinder 4 is extruded to deform in the process that the upper connecting pipe 1 is close to the tile cylinder 2, the sealing rubber cylinder 4 is expanded and extruded on a rock stratum of a drilling oil hole, the space between the packer and the oil hole is sealed by the sealing rubber cylinder 4, and the threaded connection between the upper connecting pipe 1 and the sealing pipe 3 can effectively stabilize the position of the upper connecting pipe 1, so that the expansion state of the sealing rubber cylinder 4 is stabilized, and the sealing strength is higher and more stable; in the process of deblocking the material, the material is removed, the pipe column drives the plug 15 to reversely rotate, the plug 15 is lifted up, the plug 15 carries the upper connecting pipe 1 to rotate on the sealing pipe 3, the upper connecting pipe 1 moves away from the tile clamping cylinder 2, the sealing rubber cylinder 4 is restored to the original position, the drilling oil hole is unsealed, then the plug 15 is gradually separated from the internal threaded hole 5, the plug 15 is taken out, the inner cavity of the packer is conducted, and the unsealing operation is realized; it should be noted that, in order to ensure the implementation of the above operation, the thread friction force between the sealing tube 3 and the upper connecting tube 1 needs to be smaller than the thread friction force between the plug 15 and the internal threaded hole 5, after the plug 15 is primarily screwed into the internal threaded hole 5, the plug 15 is continuously rotated to drive the upper connecting tube 1 to rotate together, so that the upper connecting tube 1 presses the sealing rubber tube 4 first, after the sealing rubber tube 4 is pressed, the plug 15 is continuously screwed into the internal threaded hole 5 again, so that when the sealing rubber tube 4 is restored to the original state first, at this time, the plug 15 is further screwed into the internal threaded hole 5, so that the plug 15 can be driven to move upwards through the pipe column, and the whole packer is further carried out, thereby completing the retreating operation of the packer. Preferably, the inner hole of the upper connecting pipe 1 is communicated with the inner threaded hole 5, the diameter of the inner hole of the upper connecting pipe 1 is smaller than that of the inner threaded hole 5, the plug 15 is abutted against a step formed between the inner threaded pipe 5 and the inner hole, and sealing of the inner hole is completed.

In some embodiments, as shown in fig. 1, a diversion cavity 6 is arranged in a slip barrel 2, the diversion cavity 6 penetrates through two ends of the slip barrel 2, a plurality of mounting grooves 7 are formed in the side wall of the slip barrel 2, the mounting grooves 7 are uniformly distributed along the circumferential direction of the slip barrel 2, friction blocks 8 are arranged in the mounting grooves 7 in a sliding manner, the friction blocks 8 move along the radial direction of the slip barrel 2, wedge faces 9 are arranged on the upper end faces of the friction blocks 8, the lower ends of the wedge faces 9 are close to the axis of the slip barrel 2, an abutting barrel 10 is arranged in the slip barrel 2, the abutting barrel 10 moves along the axial direction of the slip barrel 2, the wedge faces 9 are positioned on the moving path of the abutting barrel 10, one end of the friction blocks 8 close to the axis of the slip barrel 2 is fixedly provided with a disc 11, a reset spring 12 is arranged between the disc 11 and the inner wall of the slip barrel 2, two ends of the reset spring 12 are respectively connected with the disc 11 and the slip barrel 2, the inner cavity of a sealing tube 3 is provided with internal threads, the outer wall of the abutting cylinder 10 is provided with external threads, the abutting cylinder 10 is in threaded connection with the sealing tube 3, one end of the abutting cylinder 10, which is close to the upper connecting tube 1, is provided with a threaded hole 13, the abutting cylinder 10 is driven to move through a threaded rod, the threaded rod is in threaded fit with the threaded hole 13, the threaded friction between the threaded rod and the threaded hole 13 is larger than the threaded friction between the abutting cylinder 10 and the sealing tube 3, the threaded rod is driven to rotate and move downwards through an external tubular column, after the threaded rod is primarily screwed into the threaded hole 13, the threaded rod drives the abutting cylinder 10 to screw downwards on the sealing tube 3, so that the abutting cylinder 10 extrudes a friction block 8, the friction block 8 moves outwards away from the axis of the tile cylinder 2, so that the friction block 8 abuts against a rock stratum of an oil hole, the position of a packer is locked, and when the packer is unsealed, the threaded rod firstly drives the abutting cylinder 10 to screw on the sealing tube 3, make the butt section of thick bamboo 10 remove from the clutch blocks 8, under reset spring 12's effect, make the clutch blocks 8 reset, release the locking operation of packer, the threaded rod still adapts at screw hole 13 this moment, then through the pulling tubular column, carry out the packer is whole through the threaded rod, realize can move back the operation, because the mode that butt section of thick bamboo 10 adopted the screw thread removes in order to push up the clutch blocks 8, make the position of the locking clutch blocks 8 that butt section of thick bamboo 10 can high strength, avoid appearing the condition that drops, conveniently carry out the recovery of packer. It is worth noting that the external pipe column firstly clamps the threaded rod and is screwed downwards to drive the friction block 8 to move, after the pipe column is locked in place, the threaded rod is loosened, then the plug 15 is clamped to seal the upper connecting pipe 1, finally the pipe column is loosened to finish well closing operation, when the pipe column is unsealed, the plug head 15 is firstly unsealed, the abutting barrel 10 is unsealed, finally the packer is carried out through the threaded rod, and when the packer is concretely implemented, the bottom of the pipe column is connected with the hydraulic mechanical claw, and the threaded pipe and the plug 15 are clamped or loosened through the hydraulic mechanical claw.

Further, the inner cavity diameter of the abutting barrel 10 is smaller than the diameter of the threaded hole 13, a plurality of friction teeth 14 are arranged at one end, far away from the tile clamping barrel 2, of the friction block 8, the friction teeth 14 are arranged at equal intervals along the radial direction of the tile clamping barrel 2, rock strata are snapped through the friction teeth 14, the fixing strength of the packer is improved, and the situation that the packer falls off is avoided.

In the description of the present utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "one side," "top," "inner," "front," "center," "two ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying 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 thus should not be construed as limiting the present utility model; and those of ordinary skill in the art will appreciate that the benefits achieved by the present utility model are merely better than those achieved by the current embodiments of the prior art in certain circumstances and are not intended to be the most excellent uses directly in the industry.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims

1. A packer for downhole well closing, its characterized in that includes takeover (1) and slips section of thick bamboo (2), the one end coaxial fixed with sealed tube (3) of slips section of thick bamboo (2), the outer wall of sealed tube (3) is equipped with the screw thread, it is in to go up takeover (1) thread bush on sealed tube (3), it is equipped with a plurality of sealed packing elements (4) to follow self axial cover on sealed tube (3), sealed packing elements (4) are located go up between takeover (1) and slips section of thick bamboo (2), go up takeover (1) and keep away from one end of slips section of thick bamboo (2) has seted up internal thread hole (5), the screw thread of internal thread hole (5) revolve to the same with the external screw thread of sealed tube (3) revolves to, internal thread hole (5) internal thread adaptation has end cap (15), end cap (15) are used for connecting outside tubular column.

2. A packer for downhole shut-in according to claim 1, wherein the inner bore of the upper nipple (1) communicates with the internally threaded bore (5), the inner bore diameter of the upper nipple (1) being smaller than the diameter of the internally threaded bore (5).

3. The packer for underground well shut-in according to claim 2, wherein a diversion cavity (6) is arranged in the slip barrel (2), the diversion cavity (6) penetrates through two ends of the slip barrel (2), a plurality of mounting grooves (7) are formed in the side wall of the slip barrel (2), the mounting grooves (7) are uniformly distributed along the circumferential direction of the slip barrel (2), friction blocks (8) are slidably arranged in the mounting grooves (7), and the friction blocks (8) move along the radial direction of the slip barrel (2).

4. A packer for downhole well shut-in according to claim 3, wherein the upper end surface of the friction block (8) is provided with a wedge surface (9), the lower end of the wedge surface (9) is arranged close to the axis of the slip cylinder (2), an abutment cylinder (10) is arranged in the slip cylinder (2), the abutment cylinder (10) moves along the axial direction of the slip cylinder (2), and the wedge surface (9) is located on the movement path of the abutment cylinder (10).

5. The packer for downhole well shut-in according to claim 4, wherein a disc (11) is fixed at one end of the friction block (8) close to the axis of the slip cylinder (2), a return spring (12) is arranged between the disc (11) and the inner wall of the slip cylinder (2), and two ends of the return spring (12) are respectively connected with the disc (11) and the slip cylinder (2).

6. The packer for downhole well shut-in according to claim 5, wherein the inner cavity of the sealing tube (3) is provided with an inner thread, the outer wall of the abutting tube (10) is provided with an outer thread, the abutting tube (10) is in threaded connection with the sealing tube (3), and one end of the abutting tube (10) close to the upper connecting tube (1) is provided with a threaded hole (13).

7. A packer for downhole shut-in according to claim 6, wherein the diameter of the inner cavity of the abutment cylinder (10) is smaller than the diameter of the threaded bore (13).

8. A packer for downhole shut-in according to claim 3, wherein the end of the friction block (8) remote from the slip bowl (2) is provided with a plurality of friction teeth (14), the friction teeth (14) being equally spaced along the radial direction of the slip bowl (2).