Patent ID: 9458698
Filing Date: 2016-10-04
CPC Classification: E21B

Claim Text:
1. A stimulation valve for a well tubular, said stimulation valve comprising: (a) a cylindrical housing adapted for assembly into a tubular for a well and defining a conduit for passage of fluids through said housing and a port allowing fluid communication between said conduit and the exterior of said housing; (b) a valve sleeve adapted for movement from a closed position restricting fluid communication through said port to an open position allowing fluid communication through said port; (c) a driver adapted for linear indexing relative to said housing from an initial position through one or more intermediate positions to a terminal position, said indexed driver being operatively connected to said valve sleeve such that said valve sleeve moves from said closed position to said open position as said indexed driver moves to said terminal position; (d) a shifter adapted for linear reciprocation relative to said housing, said shifter adapted to index said indexed driver from said initial position through said intermediate positions to said terminal position; (e) said shifter comprising an actuation seat adapted to receive a ball for actuation of said shifter and to release said ball after actuation of said shifter; (f) an isolation seat adapted to allow passage of said ball when said indexed driver is in said initial and intermediate positions and to receive said ball when said indexed driver is in said terminal position, said ball restricting fluid flow through said conduit when received by said isolation seat.