Patent ID: 9453385
Filing Date: 2016-09-27
CPC Classification: E21B,F15B

Claim Text:
1. A method for pressurizing a hydraulic accumulator, comprising: creating an annulus pressure zone by closing rams in a blowout preventer stack, said annulus pressure zone being in hydraulic communication with a hydraulic accumulator through a hydraulic recharging circuit, the hydraulic recharging circuit having a hydraulic intensifier in communication with a hydraulic reservoir and with a hydraulically actuated device; applying a hydraulic pressure to the annulus pressure zone; operating the hydraulic recharging circuit via shifting of the hydraulic intensifier in response to the applied hydraulic pressure; pressurizing the hydraulic accumulator in response to the operating the hydraulic recharging circuit; and shifting the hydraulic intensifier back toward an original position to draw hydraulic fluid from the hydraulic reservoir.