APPARATUS AND METHODS TO CONTROL FLUID FLOW IN A DOWNHOLE TOOL

摘要

The present invention relates to a pumping system (600) for controlling fluid flow in a downhole tool (200). The pumping system icludes a hydraulically actuatable device including at least one cavity for receiving pressurized hydraulic fluid (616) and a reservoir (608) for storing the hydraulic fluid. A first (602a) and second (602b) hydraulic pump include an inlet (612a, 612b) fluidly coupled to the reservoir (608) and an outlet (614a, 614b) fluidly coupled (616) to the at least one cavity. At least one motor (604) is operatively coupled to at least one of the first (602a) and second (602b) hydraulic pumps. In addition, the system includes means (622a, 622b) for selectively flowing hydraulic fluid from the outlet of at least one of the first and second pumps to the at least one cavity.