Bridge plug for horizontal well

Abstract

The invention discloses a bridge plug for a horizontal well. The bridge plug comprises a central pipe. A boss is formed in the middle of the central pipe. A sealing and separating mechanism, an upper base sealing mechanism, a releasing mechanism and an upper joint are arranged from the boss to one side in sequence; and a cylindrical slip, a lower base sealing mechanism and a lower joint are arranged from the boss to the other side in sequence. The outer wall of the lower end of the upper joint is inwardly concave to form a releasing mounting part. The releasing mechanism is mounted on the releasing mounting part. The releasing mechanism comprises a releasing piston sleeve, a releasing piston, a releasing connection sleeve and a releasing connection head. The releasing piston and the releasing piston sleeve are arranged at the releasing mounting part. A first liquid inlet is formed at the part, near the upper end of the releasing piston, of the upper joint. The releasing piston is fixedly connected with the releasing piston sleeve by virtue of a releasing shear pin. The releasing piston sleeve and the releasing connection head are locked by a locking block. A groove corresponding to the locking block is formed at the outer side of the releasing piston between the releasing shear pin and the locking block. The bridge plug for the horizontal well has the advantages of simple structure, safety, reliability, and easiness for milling in a later stage.

Description

technical field [0001] The invention relates to the field of horizontal wells in the petroleum industry, in particular to a horizontal well bridge plug for blocking water layers and retaining positions. Background technique [0002] At present, the downhole bridge plugs researched, designed and applied in China are only equipped with pistons in one direction. Under the condition of force, the center pipe is easy to be broken, and the current drop-off structure has problems when it is applied to horizontal wells. Risks that cannot be successfully discarded. In addition, the existing bridge plugs are basically made of metal materials. Although some materials are ductile iron materials that are relatively easy to grind and mill, there are still the following disadvantages for horizontal wells: 1. It is difficult to grind and mill when used in horizontal wells ; 2. The powder and fragments produced after milling are not easy to wash out of the wellbore; 3. During the milling pr...

AI Technical Summary

Problems solved by technology

[0002] At present, the downhole bridge plugs researched, designed and applied in China are only equipped with pistons in one direction. Under the condition of force, the center pipe is easy to be broken, and the current drop-off structure has problems when it is applied to horizontal wells. The risk of not being able to throw away smoothly

In addition, the existing bridge plugs are basically made of metal materials. Although some materials are ductile iron materials that are relatively easy to grind and mill, there are still the following disadvantages for horizontal wells: 1. It is difficult to grind and mill when used in horizontal wells ;2. The powder and fragments produced after milling are not easy to wash out of the wellbore; 3. During the milling process, it is easy to damage the casing; 4. The workload of milling is large

Due to the existence of the above disadvantages, the implementation of horizontal well plugging water layer and clamping technology is limited

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