A kind of soluble bridge plug and preparation method thereof

Abstract

A dissolvable bridge plug and a preparation method thereof, the bridge plug comprising: a cone, the outer wall of which has a first tapered surface; a sealing expansion ring, whose inner wall has a second tapered surface, and the sealing expansion ring is mounted on the small end of the cone and has a predetermined distance from the small end face, the sealing expansion ring has a first slope; the slip is cylindrical, its inner wall has a third tapered surface, one end of the slip has a second slope, and the other end has a third slope, There are multiple guide columns on the third slope, and the slips are provided with a plurality of slits along the circumference array. The outer wall of the slips is provided with a number of annular grooves, and a stress ring sleeve is arranged in the annular grooves. The slips are installed on the small cone. At the end; the guide shoe, one end of which has a fourth slope, and a plurality of guide grooves on the fourth slope, and the guide shoe is mounted on the other end of the slip. Simplify the structure of the bridge plug and reduce the number of parts. The slips are opened and divided into multiple pieces after being stressed, and they will not fall when they are separated or after they are separated, and they will not deviate from the axis. , good stability and easy assembly.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a soluble bridge plug and a preparation method thereof. Background technique [0002] Dissolvable bridge plugs are used to temporarily block oil, gas, water, leakage and other layers, and can perform high-pressure fracturing operations on the production layer above the bridge plug. Automatic dissolution, currently mainly used in shale gas well formation stimulation. [0003] In the current bridge plug structure, the slip assembly uses multiple sheet-like slips. During the opening process of this multi-piece slip assembly, some slips may deviate from the original circumferential array under the action of their own gravity. position, which will lead to an unexpected state of final fit with the bushing, which will not only cause instability, but also cause the bridge plug as a whole to deviate from the axis, resulting in abnormal use; at the same time, the current bridge...

AI Technical Summary

Problems solved by technology

[0003] In the current bridge plug structure, the slip assembly uses multiple sheet-like slips. During the opening process of this multi-piece slip assembly, some slips may deviate from the original circumferential array under the action of their own gravity. position, which will lead to an unexpected state of final fit with the bushing, which will not only cause instability, but also cause the bridge plug as a whole to deviate from the axis, resulting in abnormal use; at the same time, the current bridge plug structure is relatively Complicated, requiring more devices, joint action can complete the plugging together, especially when dealing with the problem of slip offset, the structure is more complex and needs to be optimized and improved

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