Knife gate valve stage cementer

Details Knife gate valve stage cementer Knife gate valve stage cementer

1992-10-19

1994-04-05

Bui, Thuy M.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, E21B 3400

Patent

active

052996409

ABSTRACT:
Methods and apparatus are described which permit stage cementing within a well bore by means of a well tool which includes a cementer having cementing ports which may be responsively opened and closed by means of a knife gate valve. The knife gate valve is disposed within the housing between outer and inner cylindrical walls and being slidable therein between an open position, wherein the cementing port is open and fluid may be communicated therethrough, and a closed position, wherein the cementing port is closed thus blocking fluid communication through said port. The knife gate valve is further operationally associated with a driver assembly and trigger device adapted to receive a trigger signal and actuate the driver assembly in response thereto. In alternate exemplary embodiments, the trigger signal may comprise an acoustical, magnetic, electromagnetic wave, electrical or other suitable signal which is received by the trigger device. The driver assembly may comprise a hydraulic or pneumatic arrangement or a suitable electric motor arrangement.

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