CN215444015U

CN215444015U - Composite soluble bridge plug

Info

Publication number: CN215444015U
Application number: CN202120889693.XU
Authority: CN
Inventors: 国际
Original assignee: Daqing Dasheng Petroleum Technology Co ltd
Current assignee: Daqing Dasheng Petroleum Technology Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2022-01-07
Anticipated expiration: 2031-04-27

Abstract

The utility model provides a composite soluble bridge plug. Relates to the technical field of oil field downhole tools. The shear pin hole has been seted up to the center tube upper end, and the center tube upper end cover is equipped with and keeps off the ring, and it is spacing by the step of center tube upper end to keep off the ring, keeps off the ring under the center tube lower extreme threaded connection down, keeps off down between ring and the last ring, and the packing element both sides are equipped with symmetrical arrangement's packing element seat and slips in proper order, keeps off the ring lower part down and is equipped with the guide shoe, and the guide shoe passes through shear pin and center tube fixed seal and connects. The utility model has the following beneficial effects: the pipe column carries the bridging plug and goes into the well in-process, goes up the retaining ring and passes through locating pin connection center tube, can not appear hanging the card because of meeting slightly in the pit shaft and block, meet the card and sit the problem of sealing in advance, the slips passes through one-way tooth connection center tube, sits and seals reliably, both can effectively exert the soluble drilling-free characteristic of bridging plug, can promote fracturing again simultaneously, well workover, store up the efficiency that changes, avoid environmental pollution, can pressurize simultaneously will cut the pin fracture, the guide shoe is thrown off and is used as the packer.

Description

Composite soluble bridge plug

The technical field is as follows:

the utility model relates to the technical field of oil field downhole tools, in particular to a composite soluble bridge plug.

Background art:

at present, the soluble bridge plug made of composite materials is mostly adopted in shaft restoration and reservoir transformation of oil and gas fields at home and abroad, and the soluble bridge plug can be automatically dissolved in mineralized substances with certain concentration along with time on the premise of realizing the function of technological requirements, so that the on-site use requirements are met, but the soluble bridge plug used at present has the risk of setting in advance to a certain extent.

The utility model has the following contents:

in order to solve the above problems, the present invention provides a composite soluble bridge plug.

The technical scheme of the utility model is as follows: a composite soluble bridge plug comprises a central tube, wherein a shear pin hole is formed in the upper end of the central tube, an upper retaining ring is sleeved on the upper end of the central tube and limited by a step at the upper end of the central tube, the lower end of the central tube is in threaded connection with a lower retaining ring, a rubber tube seat and slips which are symmetrically arranged are sequentially arranged on two sides of a rubber tube, a guide shoe is arranged at the lower part of the lower retaining ring, and the guide shoe is fixedly and hermetically connected with the central tube through a shear pin;

the central tube, the upper retaining ring, the slips, the rubber cylinder seat, the rubber cylinder, the lower retaining ring and the guide shoe are all made of soluble materials.

The slips and the central pipe are connected through one-way teeth.

The upper baffle ring is fixedly connected with the central tube through a positioning pin.

Slip teeth are uniformly distributed and fixed on the outer edge of the slip.

The lower end of the lower baffle ring is provided with a guiding conical surface I, and the lower part of the guide shoe is provided with a guiding conical surface II.

And a layer of wear-resistant paint is laid outside the lower baffle ring and the guide shoe.

The utility model has the following beneficial effects: the hydraulic setting tool is used for setting, and can be used for oil and gas well shafts and stratum fracturing processes, when a pipe column carries a bridge plug to enter a well, an upper retaining ring is connected with a central pipe through a positioning pin, the problem of hanging and clamping in advance setting due to slight blockage and clamping in the well is solved, the bridge plug is ensured to be set according to a preset process position, a slip is connected with the central pipe through a one-way tooth, the setting is reliable, the soluble drilling-free characteristic of the bridge plug can be effectively exerted, meanwhile, the fracturing, well repairing and storage and modification efficiencies can be improved, the recovery of oil and gas well production is accelerated, the environmental pollution is avoided, meanwhile, the shearing pin can be pressurized to fracture, and a guide shoe is separated to be used as a packer.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention.

In the figure, 1-a central tube, 2-an upper retaining ring, 3-a slip, 4-a rubber cylinder base, 5-a rubber cylinder, 6-a lower retaining ring, 7-a guide shoe, 8-a shearing pin, 9-a one-way tooth, 10-a slip tooth, 11-a positioning pin, 12-a shearing pin hole, 13-a guiding conical surface I and 14-a guiding conical surface II.

The specific implementation mode is as follows:

the utility model will be further described with reference to the accompanying drawings in which:

as shown in fig. 1, the composite soluble bridge plug comprises a central tube 1, wherein a shear pin hole 12 is formed in the upper end of the central tube 1, an upper retaining ring 2 is sleeved on the upper end of the central tube 1, the upper retaining ring 2 is limited by a step at the upper end of the central tube 1, the lower end of the central tube 1 is in threaded connection with a lower retaining ring 6, the lower retaining ring 6 is arranged between the upper retaining ring 2 and the rubber tube 5, symmetrically arranged rubber tube bases 4 and slips 3 are sequentially arranged on two sides of the rubber tube 5, a guide shoe 7 is arranged at the lower part of the lower retaining ring 6, and the guide shoe 7 is fixedly and hermetically connected with the central tube 1 through a shear pin 8;

the central tube 1, the upper retaining ring 2, the slips 3, the rubber cylinder seat 4, the rubber cylinder 5, the lower retaining ring 6 and the guide shoe 7 are all made of soluble materials, so that the bridge plug has the characteristics of solubility and drilling resistance.

The slips 3 and the centre tube 1 are connected by one-way teeth 9.

The upper baffle ring 2 is fixedly connected with the central tube 1 through a positioning pin 11.

Slip teeth 10 are uniformly distributed and fixed on the outer edge of the slip 3.

The lower end of the lower baffle ring 6 is provided with a guiding conical surface I13, and the lower part of the guide shoe 7 is provided with a guiding conical surface II 14.

Keep off ring 6 and guide shoe 7 outside down and all lay one deck wear-resistant coating, can effectively avoid guide shoe 7, keep off ring 6 and the wall of a well production friction down, guarantee the fixity between guide shoe 7 and center tube 1.

Before use, a hydraulic setting tool is connected with a shear pin hole 12 reserved at the upper end of the central tube 1 by a shear pin. When the hydraulic setting tool is used, the hydraulic setting tool is connected to be put into a preset position of a shaft through a conventional oil pipe or a continuous oil pipe, ground equipment is pressurized, the hydraulic setting tool acts to force the central pipe 1 to lift up, the lower slip 3 is limited by the axial limit of the lower retaining ring 6, when the lifting force reaches a certain degree, the positioning pin 11 of the upper retaining ring 2 is broken, the upper retaining ring 2 and the lower retaining ring 6 expand towards the rubber cylinder base 4, the rubber cylinder 5 generates deformation of axial compression and radial expansion, the rubber cylinder 5 is expanded and then is contacted with the pipe wall of the sleeve, the upper and lower slip bodies 3 are matched with the pipe wall of the sleeve due to the mutual reverse action of the slip teeth 10 on the upper slip bodies, the slip teeth 10 form fixed limit on the deformation of the rubber cylinder 5, a sealing section is further formed through the rubber cylinder 5, the ground is pressurized to a certain degree, the shear pin connected with the central pipe 1 is cut off, the hydraulic setting tool is separated from the central pipe 1, and the hydraulic setting tool is lifted to the ground along with the well pipe column, the running and setting of the utility model are completed.

The hydraulic setting tool is used for setting, and can be used for oil and gas well shafts and stratum fracturing processes, when a pipe column carries a bridge plug to enter a well, the upper baffle ring 2 is connected with the central pipe 1 through the positioning pin 11, the problem of hanging and clamping in advance setting due to slight blockage and clamping in the well is solved, the bridge plug is ensured to be set according to a preset process position, the slips 3 are connected with the central pipe through the one-way teeth 9, the setting is reliable, the soluble drilling-free characteristic of the bridge plug can be effectively exerted, meanwhile, the fracturing, well repairing and storage improving efficiency can be improved, the recovery of oil and gas well production is accelerated, the environmental pollution is avoided, the shearing pin 8 can be pressurized to fracture, and the guide shoe 7 can be separated to be used as a packer.

Claims

1. A composite soluble bridge plug comprising a central tube (1), characterized in that: the upper end of a central tube (1) is provided with a shear pin hole (12), the upper end of the central tube (1) is sleeved with an upper retaining ring (2), the upper retaining ring (2) is limited by a step at the upper end of the central tube (1), the lower end of the central tube (1) is in threaded connection with a lower retaining ring (6), the lower retaining ring (6) and the upper retaining ring (2) are arranged between each other, two sides of a rubber cylinder (5) are sequentially provided with a rubber cylinder seat (4) and slips (3) which are symmetrically arranged, the lower part of the lower retaining ring (6) is provided with a guide shoe (7), and the guide shoe (7) is fixedly and hermetically connected with the central tube (1) through a shear pin (8);

the central tube (1), the upper retaining ring (2), the slips (3), the rubber cylinder seat (4), the rubber cylinder (5), the lower retaining ring (6) and the guide shoe (7) are all made of soluble materials.

2. A composite soluble bridge plug according to claim 1, wherein: the slips (3) are connected with the central pipe (1) through one-way teeth (9).

3. A composite soluble bridge plug according to claim 1, wherein: the upper baffle ring (2) is fixedly connected with the central pipe (1) through a positioning pin (11).

4. A composite soluble bridge plug according to claim 1, wherein: slip teeth (10) are uniformly distributed and fixed on the outer edge of the slip (3).

5. A composite soluble bridge plug according to claim 1, wherein: the lower end of the lower baffle ring (6) is provided with a guiding conical surface I (13), and the lower part of the guide shoe (7) is provided with a guiding conical surface II (14).

6. A composite soluble bridge plug according to claim 1, wherein: a layer of wear-resistant paint is laid outside the lower baffle ring (6) and the guide shoe (7).