Patent ID: 8348642
Filing Date: 2013-01-08
Classification: E21B,F04B,F16K,Y10T

Abstract:
1. A pumping apparatus of a downhole tool, comprising: a body having a cavity housing a reciprocating piston defining first and second chambers within the cavity, and an active valve block comprising a plurality of active valves, wherein the plurality of active valves includes a first active valve fluidly connected to the first chamber of the body, the plurality of active valves includes a second active valve fluidly connected to the second chamber of the body, and each of the plurality of active valves is configured to be actively actuated between open and closed positions wherein the plurality of active valves further comprises a third active valve fluidly connected to the first chamber of the body, the plurality of active valves further comprises a fourth active valve fluidly connected to the second chamber of the body, and the pumping apparatus further comprises: a hydraulic pump; a first solenoid valve fluidly connected between the hydraulic pump and each of the first, second, third and fourth active valves; and a second solenoid valve fluidly connected between the hydraulic pump and each of he first, second, third and fourth active valves.