System and method for electro-hydraulic actuation of downhole tools
AssigneeSchlumberger Technology Corporation
InventorsBenoit Deville, Srinivas Poluchalla, Virinchi Mallela, Marian Faur, Charley Martinez
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Abstract
A technique facilitates wellbore operations and utilization of wellbore equipment, e.g. equipment comprising actuation devices for downhole tools. According to an embodiment, the system comprises a pump solution for an electrically control device, e.g. an electrically controlled valve. The system may comprise hydraulic circuitry which utilizes bellows to effectively enclose the hydraulic circuitry. Consequently, the system enables an electrically control downhole system having components hydraulically actuated via a closed loop hydraulic system.
Claims16
A system for use in a well, comprising:
- a tubing string deployed in a borehole, the tubing string having a downhole tool actuatable by a downhole hydraulic system, the downhole hydraulic system comprising a piston and an accumulator spring disposed in a pressure chamber, the piston coupled to the downhole tool via a rod to actuate the downhole tool between operational positions;
- a pumping assembly hydraulically coupled with the pressure chamber;
- a bellows system arranged to contain hydraulic actuating fluid in a metal enclosed loop within the downhole hydraulic system, the bellows system comprising:
- a first sealed metal bellows disposed around the rod and within a bellows chamber;
- and
- a second sealed metal bellows fluidly coupled to the bellows chamber;
- and
- a control system coupled with the downhole hydraulic system via an electrical line to enable control over the downhole hydraulic system via electric signals.
A method, comprising:
- providing an electro-hydraulic actuation system having a downhole hydraulic system electrically controlled via a surface control system;
- coupling the downhole hydraulic system with a downhole tool via a piston, an accumulator spring, and a piston rod;
- locating a sealed bellows of a bellows system around the piston rod and within a bellows chamber of the bellow system;
- fluidly coupling the bellows chamber with a compensating bellows of the bellow system;
- utilizing the bellows system in the downhole hydraulic system to provide a leakproof,
- closed-loop hydraulic system for actuating the downhole tool, the leakproof,
- closed-loop hydraulic system being fully metal enclosed;
- and
- providing electric signals to the downhole hydraulic system to cause hydraulic actuation of the downhole tool to a desired operational position.
A system for use with a downhole tool, the system comprising:
- a downhole hydraulic system having:
- a piston and an accumulator spring, disposed in a pressure chamber and the piston couplable to the downhole tool via a rod coupled to the piston;
- a pumping assembly hydraulically coupled with the pressure chamber, the pumping assembly being electrically controllable;
- and
- a bellows system arranged to contain hydraulic actuating fluid in a closed loop within the downhole hydraulic system to avoid leakage of hydraulic actuating fluid to a surrounding environment, the bellows system comprising:
- a first sealed metal bellows disposed around the rod and within a bellow chamber, and
- a second sealed metal bellows fluidly coupled to the bellows chamber.
Dependencies are inferred from the claim text.