Casing valves system for selective well stimulation and control

摘要

A valve for use in a tubular string in a subterranean well includes a sleeve having first and second opposite ends, the sleeve being displaceable between open and closed positions to thereby selectively permit and prevent flow through a sidewall of a housing assembly, and a first and second pistons at the respective first and second ends of the sleeve. Pressure differentials applied to the first and second pistons are operative to displace the sleeve between its open and closed positions.

主权项

1. A valve for use in a tubular string in a subterranean well, the valve comprising:
a housing assembly defining first and second chambers; a sleeve disposed within the housing assembly and having first and second opposite ends, the sleeve being displaceable between open and closed positions to thereby selectively permit and prevent flow through a sidewall of a housing assembly; and first and second pistons at the respective first and second ends of the sleeve, pressure differentials applied between the first and second pistons through a first line and a second line, respectively, being operative to displace the sleeve between the open and closed positions, wherein an outer external diameter of the sleeve is sealingly engaged to an outer internal diameter of the respective first and second chambers, and an inner external diameter of the sleeve is sealingly engaged to an inner internal diameter of the respective first and second chambers to define the first and second pistons.