Patent ID: 11952864
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 9:
10. A method comprising:
deploying a well string having the isolation valve of claim 1 downhole in a wellbore,
wherein the ball valve element is in the open position during the deploying step, and
wherein the upper hydraulic chamber and the lower hydraulic chamber have equal pressures during the deploying step;

shifting the actuation mandrel to close the ball valve element, which causes the collet piston to rest on an angled bevel of the actuation mandrel;
using the trigger section to create the pressure differential between the upper hydraulic chamber and the lower hydraulic chamber;
stroking the actuation mandrel via the collet piston to open the ball valve element in response to the pressure differential;
disengaging the collet piston from the actuation mandrel such that the collet piston no longer rests on the angled bevel of the actuation mandrel; and
shouldering the collet piston on a lower portion of the piston housing.