plug

Abstract

The invention discloses a plug, belonging to the technical field of oil well maintenance. The communicable mechanism in the occluder includes: an upper joint, a piston sleeve whose upper end is fixed in the lower end of the upper joint through first scissors, a first piston slidably arranged in the piston sleeve, and a first piston sleeved in the first The sawtooth ring on the piston and the second piston arranged in the lower end of the first piston through the second scissors. After the plug is installed in the pipe string, if the pipe string is stuck, liquid can be injected through the wellhead to increase the liquid pressure above the plug, and the liquid pressure is applied to the top wall of the second piston to make the first The two scissors are cut, the second piston moves downward, and the first piston and the second piston are separated, thereby conducting the plug, so that the liquid above and below the plug can flow through the plug, so as to further Provide conditions for maintenance or production, thereby improving production efficiency.

Description

technical field [0001] The invention relates to the technical field of oil well maintenance, in particular to a plug. Background technique [0002] During workover operations of oil and water wells, due to the huge downhole pressure, in order to prevent blowout accidents and at the same time avoid the use of killing hydraulic wells to pollute the oil layer, the operation is usually under pressure. One of the steps of under pressure operation is to maintain the pressure in the original well. Before the pipe string is pulled down, the plug needs to be put into the pipe string and fixed on the inner wall of the pipe string, so as to prevent high pressure liquids such as crude oil and water from entering the pipe string to be lifted and overflowing from the wellhead. [0003] At present, the commonly used occluder includes a slip mechanism, a sealing mechanism, a setting mechanism, a locking mechanism and a positioning mechanism which are sequentially connected from top to botto...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a plug, which can solve the problem that after the currently commonly used plug is installed in the pipe string, if the pipe string is stuck, the operation process will be forced to stop, and it is necessary to wait for the overhaul equipment to carry out further maintenance. During the process, the oil well cannot resume production, which takes a lot of time and causes the problem of low production efficiency

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