Underground packed-hole vortex tool for water drainage and gas production

Abstract

An underground packed-hole vortex tool for water drainage and gas production comprises a salving head, a swirl flow body, a connecting body, a liquid incoming pipe and a sitting and clamping device. A spiral wing in the swirl flow body is composed of two parts, each part is composed of a cuboid structure and a spiral structure, and the two parts have certain spiral lift angle structures which are connected, have 360-degree projection and are mounted in a rectangular through groove and a spiral through groove of an outer barrel 4; a conical mandrel moves downwards to provide radial thrust to strut upper and lower annular springs to enable the same to extend along the rectangular groove of the outer barrel and to get close to the inner wall of a pipe column so as to realize packed-hole working state of the vortex tool; when the conical mandrel moves upwards, the spiral wing under elasticity action of the annular springs contracts along the rectangular groove of the outer barrel to the center and breaks away from the inner wall of the pipe column so as to realize diameter shrinkage. An extensible structure is adopted, the problem that a gap exists between a conventional vortex tool and the inner wall of the pipe column is solved, the packed-hole working state of the vortex tool is realized, own energy of a gas well is utilized fully, and liquid carrying ability and liquid discharging effect of the gas well are improved.

Description

technical field [0001] The invention relates to a downhole tool for low-yield gas wells in which wellbore fluid accumulation occurs in the middle and later stages of needle mining, and in particular to a downhole full-bore vortex tool for drainage and gas recovery. Background technique [0002] With the continuous deepening of oil and natural gas development, the production of natural gas reservoirs in the middle and later stages of production gradually decreases, and more and more low-yield gas wells have insufficient natural gas liquid-carrying capacity, and the accompanying problem of wellbore liquid accumulation is becoming more and more serious. [0003] There are many kinds of drainage gas recovery techniques. One of the more advanced drainage gas recovery technologies at present is the drainage gas recovery of downhole vortex tools. The spiral wing structure produces a spiral flow along the trajectory of the spiral wing; and under the action of centrifugal force, a sp...

AI Technical Summary

Problems solved by technology

[0004]The vortex tool has achieved certain effects in drainage and gas recovery, but in order to smoothly lower the vortex tool and sit stuck in the predetermined position in the downhole wellbore, it is necessary to make the vortex tool as a whole The outer diameter is smaller than the inner diameter of the pipe string, so there must be a gap between the outer diameter of the spiral wing of the vortex tool and the inner wall of the pipe string; the existence of this gap greatly reduces the liquid drainage effect of the vortex tool

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