Patent ID: 9695679
Date: 2017-07-04
CPC Classifications: E21B,F04B

Claim:
1. A method of actuating a well tool, comprising: applying a first hydraulic pressure through a first control line to a set input of a manifold thereby opening a first communication path for a fire input of the manifold; then applying a second hydraulic pressure through a second control line to the fire input while holding the first hydraulic pressure on the set input to maintain the open first communication path thereby establishing flow pathways for a third control line to a first side of a hydraulic operated element and a fourth control line to a second side of the hydraulic operated element; and then applying a third hydraulic pressure through at least one of the third and fourth control lines for actuation of the well tool wherein each manifold includes a first piston having a passage through which fluid from one of the control lines passes to an operator for a second piston configured to open a communication path for another one of the control lines coupled to operate the first piston and upon pressurization block the passage through the first piston.