WELL CIRCULATION CONTROL DEVICE Russian patent published in 2012 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: device consists of detachable housing with annular groove, fixed sleeve rigidly attached to adapter and spring-loaded movable sleeve arranged in annular groove, and ball fixing assembly in the form of upper and lower mounting seats. At that, ball fixing assembly is made in the form of upper and lower collets attached to each other in the middle. Upper collet is provided with annular projection. Detachable housing is equipped with circulation holes. At that, movable support is installed in annular groove with possibility of shutting off circulation holes and interaction with annular projection of upper collet.

EFFECT: possibility of creating hydrodynamic connection of axial channel of tubing string to inter-tube space of the well and improving the reliability of formation of mounting surface of upper and lower seats.

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