Patent ID: 6328112
Filing Date: 2001-12-11
Classification: E21B

Abstract:
A valve for controlling fluid flow through at least one orifice in a wall of a downhole tubing that has a circumference, comprising:a seat defined about the at least one orifice;at least one cover selectively positionable at and between an open position and a closed position, the at least one cover slideably and sealingly engaging the seat,the at least one cover extending less than the full circumference of the tubing, wherein:the wall of the tubing has an interior and an exterior surface;the seat comprises an inner seat portion defined by the interior surface about the at least one orifice and an outer seat portion defined by the exterior surface about the at least one orifice;a first cover selectively positionable at and between an open and closed position, the first cover slideably and sealingly engaging the inner seat portion; anda second cover selectively positionable at and between an open and closed position, the second cover slideably and sealingly engaging the outer seat portion.