Unclamping method and device adopting continuous jarring through spring periodically stretching out and drawing back

Abstract

The invention discloses an unclamping method and device adopting continuous jarring through spring periodically stretching out and drawing back. According to the unclamping method and device, a valveis arranged in a tubular column, when the pressure of circulating fluid entering the tubular column is larger than the counter-acting force of a spring inside the tubular column and a valve hole is closed, the pressure of the circulating fluid compresses the spring and is converted into compressed elastic potential energy of the spring, when the compressed elastic potential energy of the spring isincreased gradually and equal to the pressure of the circulating fluid, the valve hole is opened, the pressure inside the tubular column is unbalanced instantly, the compressed elastic potential energy of the spring is released instantly and drives a jar weight inside the tubular column to upwards impact suddenly, and impacting kinetic energy is transmitted to the clamping point through the tubular column; after one-time impacting is completed, all components inside the tubular column are reset simultaneously to well prepare for energy storage impact of the next time, the process is repeated,and periodical repeat jarring is formed till unclamping is achieved. The unclamping method and device can be used for salvage operation of vertical wells and can also be used for unclamping and salvage operation of deviated wells, greatly-displaced wells and horizontal wells; and during operation, manual resetting operation is not needed, continuous jarring can be achieved till unclamping is achieved, and the unclamping method and device are more efficient and quicker than a conventional technology.

Description

technical field [0001] The invention relates to a stuck-releasing method and device using periodic stretching and continuous vibration of springs, and belongs to the technical field of downhole stuck-releasing of horizontal wells in oil fields. Background technique [0002] In the development process of highly deviated wells or horizontal wells in oil fields, tools such as packers, slips, hydraulic anchors, and pumps need to be lowered into oil, gas and water wells to perform various operations. These tools have been working downhole for a long time; Production strings are often unable to be lifted, lowered, and rotated due to sand, salt, scaling, waxing, etc. Tool stuck accident is the most common and most easily caused downhole pipe string stuck in workover construction. Existing jam release methods mainly adopt measures such as vigorously pulling activity jam release and jar jam release. To release the jam by vigorously pulling, it is necessary to lift the pipe string vi...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method and device for unjamming using periodic stretching and continuous vibration of springs, so as to solve the problem that the existing jars cannot transmit the lifting force on the wellhead of highly inclined wells or horizontal well sections to the downhole level. The technical problem that the fish fell in the section well cannot be salvaged, so as to overcome the shortcomings of the existing technology

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