Patent ID: 9359877
Filing Date: 2016-06-07
CPC Classification: E21B

Claim Text:
1. A single trip well stimulation tool comprising: a plurality of valve mechanisms, a plurality of tubulars connected between the valve mechanisms, a plurality of time variable actuators each including an adjustable timer mechanism, and means for deactivating the adjustable timer mechanism once the timer mechanism has been initially activated; and means for retaining the time that the timer mechanisms have been activated so that upon reactivation the timers will all resume at the point where they were deactivated, wherein the time variable valve actuators include a first piston having a surface exposed to pressure within the tubulars, an orifice piston having a flow control device therein, a chamber filled with fluid, a pressure release rod, a second chamber charged with a pressurized gas, a second piston movable within a third chamber movable by the pressurized gas in the second chamber and a sleeve connected to the second piston.