Circulated washing device for expansion pipe inner annulus

Abstract

The invention discloses a circulated washing device for an expansion pipe inner annulus. The circulated washing device for the expansion pipe inner annulus comprises an expansion cone seat and an expansion cone which is sleeved at the upper portion of the expansion cone seat. A sliding sleeve is sleeved at the inner pipe wall of the expansion cone seat in a sealing mode, and a ring-shaped groove is formed in the inner wall face of the sliding sleeve. A locating seat is fixedly arranged at the bottom of the expansion cone seat, a center hole which is communicated with an expansion pipe sending cavity is axially formed in the locating seat, and a first press spring is arranged between the locating seat and the sliding sleeve. A plurality of through holes are formed in a pipe wall of the upper portion of the expansion cone seat along the circumferential direction, and the plurality of through holes are sealed and blocked by the side wall of the upper end of the sliding sleeve. A starting washing blinding is arranged in the sliding sleeve in the axial direction. The circulated washing device for the expansion pipe inner annulus supplies a solution to sand blocking or the other foreign matter sticking and blocking of an expansion cone operation area in a construction process, the fact that the expansion pipe inner wall annulus and the expansion cone operation area can be washed in a circulated mode is achieved to keep an area to be expanded clean so that successful expansion construction is guaranteed.

Description

technical field [0001] The invention relates to a construction tool for an expansion pipe used in the petroleum industry, in particular to an annular space circulation cleaning device in the expansion pipe. Background technique [0002] Expandable pipe technology is a new technology that has been booming in recent years, and it can be applied to drilling, well completion, oil production, workover and other operations. The expansion process of the expansion tube is the process of cold hardening of the tube body. The expansion methods include mechanical and hydraulic methods. At present, the conventional expansion tube tools used in wells with severe sand production are difficult to ensure the expansion cone working area (i.e. : The contact surface of the expansion cone and the expansion pipe contact area) is clean, so sand sticking or other foreign matter sticking is easy to occur, hindering the smooth progress of expansion, and even leading to construction failure. [0003]...

AI Technical Summary

Problems solved by technology

The expansion process of the expansion tube is the process of cold hardening of the tube body. The expansion methods include mechanical and hydraulic methods. At present, the conventional expansion tube tools used in wells with severe sand production are difficult to ensure the expansion cone working area (i.e. : The contact surface between the expansion cone and the expansion tube) is clean, so sand sticking or other foreign matter sticking is easy to occur, which hinders the smooth progress of expansion and even leads to construction failure

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