초록 ▼

This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve

This invention relates to a self-contained circulation sub which may be operated upon control from the surface. It may be in the shape of a short section of drill collar and utilizes a sleeve valve to cover the circulation ports. Upon reception of an acoustic signal from the surface, a control valve directs fluid from the pipe bore onto a pressure face on the sleeve valve. The sleeve valve then moves down and exposes the circulation ports thereby allowing drilling fluids to pass from its interior to its exterior.

대표청구항 ▼

A device suitable for use in a wall as circulation sub comprising: a housing having an inner bore, an exterior wall, at least one circulation port allowing fluid communication between the inner bore and the exterior wall and adapted at its upper and lower ends to connect to well drilling pipe or col

A device suitable for use in a wall as circulation sub comprising: a housing having an inner bore, an exterior wall, at least one circulation port allowing fluid communication between the inner bore and the exterior wall and adapted at its upper and lower ends to connect to well drilling pipe or collars; a piston sleeve slidably mounted within the inner bore of the housing, covering said at least one circulation port in one position, and having pressure responsive means adapted to move the piston sleeve to another position uncovering said at least one circulation port upon application of sufficient fluid pressure from the fluid communicating between the inner bore and exterior wall; control valve means adapted to apply said sufficient fluid pressure to said piston sleeve pressure responsive means to move said piston sleeve to said another position; and means for receiving an acoustic signal from an upper portion of the well and adapted to actuate said control valve means.