Patent ID: 11965394
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E  F

Claim 15:
16. A method of operating a valve assembly within a wellbore, comprising:
opening a valve assembly by transferring a first volume of fluid into a first chamber via a first fluid conduit;
compressing a valve actuator with a second volume of fluid in a second chamber, wherein the valve actuator comprises a main piston sealingly coupled to an activation chamber containing a gas charge;
transferring the first volume of fluid and the second volume of fluid from the first chamber and the second chamber;
closing the valve assembly from an open position to a shear position via the main piston by transferring a third volume of fluid into a third chamber via a third fluid conduit as the first volume of fluid transfers out of the first chamber; and
closing the valve assembly from the shear position to a closed position by one or more push rods, wherein the one or more push rods are sealingly coupled to the main piston, and
wherein a biasing force exerted by the gas charge on the one or more push rods is less than a biasing force exerted by the gas charge on the main piston.