Tool Introduction

The E-type differential circulation valve is a type of circulation valve that can be used as a substitute valve in acid pressure operations by closing the circulation hole through pressure operation inside the pipe column after the head ball is inserted.

Structural characteristics

① The locking spindle of the cutting pin keeps the tool in an open state at all times;

② After pitching, apply pressure to cut the shear pin, and the spindle descends to close the circulation hole;

③ The pawl structure can lock the downward circulation hole of the spindle after it is closed, and the circulation hole cannot be opened.

operation

During the downhole process, the circulation hole remains open under the action of the shear pin during the cyclic operation; After the cycle operation is completed, a steel ball is inserted into the oil pipe from the wellhead, and a pump truck is used to continuously inject liquid into the oil pipe at a certain displacement and pressure to close the circulation hole. The release of the ball seat allows the steel ball to fall freely through the diameter; This tool cannot be opened again once the circulation hole is closed during use.

technical parameter