135539 ⎘
Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings with time delay systems, e.g. hydraulic impedance mechanisms
Interventionless injection safety valve
#2Hydraulic drilling jar with hydraulic lock piston
#3STAGE TOOL
#4Hydraulic delay toe valve system and method
#5Hydraulic delay toe valve system and method
#6Hydraulic delay toe valve system and method
#7Delayed opening pressure actuated ported sub for subterranean use
#8Hydraulically-metered downhole position indicator