Blanking plug

Abstract

The invention discloses a blanking plug, and belongs to the technical field of oil well maintenance. A communicating mechanism in the blanking plug comprises an upper connector, a piston sleeve, a first piston, a sawtooth ring and a second piston, wherein the upper end of the piston sleeve is fixed into the lower end of the upper connector through a first shear pin, the first piston is arranged inthe piston sleeve in a sliding mode, the first piston is sleeved with the sawtooth ring, and the second piston is arranged in the lower end of the first piston through a second shear pin. After the blanking plug is installed in a pipe column, if the pipe column is stuck, liquid can be injected through a well mouth, the liquid pressure above the blanking plug is increased, and the liquid pressureis applied to the top wall of the second piston, so that the second shear pin is sheared off, the second piston moves downwards, the first piston and the second piston are separated, the blanking plugis unblocked, the liquid above and below the blanking plug can flow through the blanking plug, conditions are provided for further maintenance or production, and the production efficiency is furtherimproved.

Description

technical field [0001] The invention relates to the technical field of oil well maintenance, in particular to a plug. Background technique [0002] During the workover operation of oil and water wells, due to the huge downhole pressure, in order to prevent blowout accidents and avoid the use of killing hydraulic wells to pollute the oil layer, it is usually a pressurized operation. One of the steps of the pressurized operation is to maintain the original well pressure. 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 sequentially connected from top to bottom. The positioning mechanism is...

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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