Small-sized soluble bridge plug

Abstract

The invention relates to a small-sized soluble bridge plug. The small-sized soluble bridge plug comprises a central pipe and a compression sleeve sleeving the upper end of the central pipe and used for compressing a rubber cylinder; a limited C-shaped ring is sandwiched between the compression sleeve and the central pipe; the compression sleeve and the limited C-shaped ring are clamped and fixed by threads; the outer side wall of the central pipe is provided with a thread-like continuous protrusion along the compressed traveling direction of a compression assembly; the inner wall of the limited C-shaped ring is provided with a thread-like continuous groove engaged with the thread-like continuous protrusion. Compared with a traditional double-slip bridge plug, the matched structure of the compression sleeve and the limited C-shaped ring is fixed without expansion produced by relative movements of two components of an existing slip assembly, a setting stroke is greatly decreased, and setting by cable pumping is allowed; in addition, due to the omittion of one slip assembly, the use area on the central pipe is saved, rubber cylinder lengthening design is allowed, and accordingly the expansion degree of the rubber cylinder and improvement of setting capability with expansion increase are ensured.

Description

technical field [0001] The invention relates to the field of soluble bridge plugs, in particular to a small-sized soluble bridge plug. Background technique [0002] Soluble bridge plug is a new type of layered and segmented reconstruction tool for shale gas fracturing. It uses a new type of magnesium-aluminum alloy material that can be dissolved in the corresponding salinity liquid, so that it can be It is dissolved by the well fluid over time, which reduces the post-fishing process, avoids the blockage of the well fluid flowback pipeline, and improves the flowback efficiency of the well fluid. However, the hardness of magnesium-aluminum alloy is lower than other metal materials, which greatly limits the pressure-bearing capacity of soluble bridge plugs. Therefore, the structure of the pressure-bearing part of soluble bridge plugs is the key to improving the pressure-bearing capacity of soluble bridge plugs. focus. [0003] In addition, with the continuous deepening of sha...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a small-sized soluble bridge plug. The purpose is to improve the functional structure of the soluble bridge plug based on the working condition characteristics of the small-sized soluble bridge plug, and solve the problem of the small-sized soluble bridge plug in the existing soluble bridge plug. Insufficient setting capacity and too long setting stroke occurred during structural improvement

Images