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Fishable bridge plug releasing mechanism and releasing and fishing method thereof

A technology for unsealing and bridging plugs, applied in the field of underground construction operations in oilfields, can solve the problems of bridge plug setting and unreliable unsealing, and achieve the effect of reliable setting and unsealing, and improving reliability.

Active Publication Date: 2016-09-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of unreliable setting and unsealing of some bridge plugs in the prior art

Method used

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  • Fishable bridge plug releasing mechanism and releasing and fishing method thereof
  • Fishable bridge plug releasing mechanism and releasing and fishing method thereof
  • Fishable bridge plug releasing mechanism and releasing and fishing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a fishable bridge plug unsealing mechanism, such as figure 1 As shown, it includes an overshot 2, a central tube 4, a rubber tube 13 and slips 17. The central tube 4 is covered with a lock shaft 3, and the inner wall of the lower part of the lock shaft 3 is locked with the outer wall of the central tube 4 through the lock ring 12. The lock shaft 3. The upper, middle and lower parts of the exterior are respectively fitted with the overshot 2, the upper rubber sleeve seat 10 and the bushing 11, and the inner wall of the lower part of the overshot 2 is connected with the push-down slip 5, and the overshot 2 is connected with the lock through the push-down slip 5. The shaft 3 is clamped, and the rubber cylinder seat 10 is clamped with the lock shaft 3 through the lock block 9 passing through the rubber cylinder base 10;

[0040] An outer limiting sleeve 8 is connected to the outer side of the lower part of the overshot barrel 2, and a connecting sle...

Embodiment 2

[0045]In this embodiment, the structure in the above-mentioned embodiment 1 is further described in detail. In this embodiment, the push-down slip 5 is a split-type slip, and the lower root is provided with a diameter-reducing step, and the push-down slip 5 is fixed on On the inner wall of the overshot 2 bottom, the outer wall of the lock shaft 3 is provided with an annular groove, and the diameter-reducing steps at the root of the push-down slips 5 are embedded in the annular groove of the lock shaft 3 .

[0046] The inner end of the lock block 9 is tapered, and the outer wall of the lock shaft 3 is provided with a tapered groove, and the inner end of the lock block 9 is embedded in the tapered groove of the lock shaft 3 .

[0047] The lock ring 12 is an open C-shaped ring with a zigzag thread on the outside, which can shrink inward. The lock ring 12 is fixed in the groove on the outer wall of the central tube 4, and forms a step-by-step locking mechanism with the lock shaft 3...

Embodiment 3

[0051] This embodiment provides a method for unsealing and salvaging a fishable bridge plug unsealing mechanism, combining Figure 1 to Figure 9 shown, including the following steps:

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Abstract

The invention belongs to the technical field of oilfield underground construction operations and particularly relates to a fishable bridge plug releasing mechanism and a releasing and fishing method thereof. The mechanism is an important underground tool for separate layer fracturing, testing and production of oil and gas wells. According to the fishable bridge plug releasing mechanism and the releasing and fishing method thereof, with the adoption of the reasonable structure, under the condition of setting of a bridge plug, releasing of a packer and anchoring relieving of slips are completed through continuous lifting and lowering, reliable setting and releasing of the bridge plug are realized, the setting and releasing reliability of the bridge plug is improved, and problems of unreliable setting and releasing of partial bridge plugs in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of downhole construction operations in oil fields, and in particular relates to a fishable bridge plug unsealing mechanism and an unsealing fishing method thereof, and is an important downhole tool for layered fracturing, testing and production seeking of oil and gas wells. Background technique [0002] Fishable bridge plugs are widely used in oil and gas well layered fracturing, testing and production operations, and the production demand is large. Use the tubing to connect and go down the well, and the operations of well washing, setting, and exploration can be completed at one time. [0003] The on-site construction is simple. When the bridge plug is lowered to the designed position, the ground rotates the pipe string clockwise, lowers the lifting pipe string, and completes the bridge plug setting. Rotate the string counterclockwise on the ground and slowly lower and lift the string to complete the drop ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/00E21B31/00E21B33/134
CPCE21B23/00E21B31/00E21B33/134
Inventor 隆世明邓小强苏敏文柳瑞军许建伟李景彬安洪飞宫娜娜徐红张文李铭徐孝山
Owner BC P INC CHINA NAT PETROLEUM CORP
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