Velocity string sand-preventing-type plugging tool and using method thereof

Abstract

The invention discloses a velocity string sand-preventing-type plugging tool and a using method thereof. The velocity string sand-preventing-type plugging tool at least comprises an inner connecting pipe connected to the bottommost end of a velocity string, the inner connecting pipe is of a string-shaped structure, a guiding head is fixed to the lower part of the inner connecting pipe, and a plughead is arranged in an inner cavity of the inner connecting pipe; and the plug head is fixed to the inner connecting pipe through a pin, a sand-preventing protective hood is fixed to the outer wall ofthe inner connecting piece in the circumferential direction of the inner connecting pipe, and gas feeding kerves are formed in the positions, below the plug head, on the side wall of the inner connection pipe and the corresponding position of the sand-preventing protective hood correspondingly. The structure is convenient, and sealing is reliable; the plug head is connected to the lower part of the velocity string, a channel where gas enters the velocity string is closely blocked, a sealing mat and the inner wall of the velocity string are reliably sealed, upper and lower sealing sleeves arearranged on the upper part of the plug head, and sealing is reliable; after the pin is sheared off and the plug head is knocked out, the plug head falls into the guiding head, and the gas enters fromthe kerves of the sand-preventing protective hood to achieve effective sand prevention; and the application range is wide, all parts in the string can bear the high pressure, and thus the velocity string sand-preventing-type plugging tool is suitable for working in deep wells or high-pressure gas wells.

Description

technical field [0001] The invention relates to the technical field of gas field development, in particular to a velocity pipe string sand prevention plugging tool and a use method, which are suitable for all vertical wells and directional wells in gas field development. Background technique [0002] Velocity string drainage gas recovery is a commonly used technology in gas fields. Its principle is to reduce the pipe diameter and increase the gas flow rate, thereby achieving the purpose of improving the liquid-carrying capacity of gas wells. At present, during the construction of running the speed pipe string, the bottom is connected with a plug. After the speed pipe string is lowered to a suitable position and the speed pipe string is suspended, the plug is removed and the well is opened for production. This technology mainly has one problem: for sand producing wells, when the gas flow velocity increases, it will carry sand and gravel out of the wellhead, puncture ground pi...

AI Technical Summary

Problems solved by technology

This technology mainly has one problem: for sand producing wells, when the gas flow velocity increases, it will carry sand and gravel out of the wellhead, puncture ground pipeline valves and other devices, causing safety hazards, thus affecting the normal production of gas wells

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