Circulation valve

Details Circulation valve Circulation valve

1982-04-21

1984-06-05

Purser, Ernest R.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166317, 166323, 166334, E21B 3410, E21B 3412

Patent

active

044523130

ABSTRACT:
A recloseable circulation valve includes a cylindrical housing having a central flow passage disposed therethrough and having a power port and a circulation port disposed through a wall thereof. An operating mandrel is telescopingly received in the upper end of the housing. A valve sleeve is slidably received in the housing and movable to open and close the circulation port. A power mandrel is disposed in the housing and is connected to the valve sleeve for moving the valve sleeve from an initial position toward an open position. A mandrel lock is provided for locking the operating mandrel and power mandrel together after the power mandrel moves the valve sleeve from its initial position. The power mandrel and valve sleeve are initially held in their initial positions by a shear pin assembly. After the power mandrel moves the valve sleeve upward toward its open position, and the power mandrel is locked to the operating mandrel by the mandrel lock, the circulation valve may be subsequently repeatedly opened and closed by picking up weight from or setting down weight on the circulation valve. Methods of testing and treating subsurface formations utilizing such a circulation valve are also disclosed.

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