to the pump device 30 the pump 36 is operably interconnected with a supply of power fluid 40 the power fluid 40 is an operating fluid for the downhole pump device 30 and is preferably filtered brine salt water a fluid return line 42 extends from the downhole pump 30 to the surface 38 wherein it is preferably associated with a fluid collection point 44 such as a sump in some preferred embodiment a controller 46 is operably associated with the downhole pump 30 via a control line 48 the controller 46 may be a preprogrammed programmable computer controller of a type known in the art for actuating the pilot valve 54 of the downhole pump 30 in accordance with a predetermined scheme in a currently preferred embodiment the controller 46 operates the pilot valve 54 on a timer during operation the fluid pump 36 preferably flows power fluid down through the inflow fluid conduit 34 in a continuous manner fig2 illustrates an exemplary downhole pump 30 in greater detail the pump device 30 includes a pilot control section 50 and a piston pump portion 52 it can be seen that the inflow fluid conduit 34 runs into a pilot valve 54 within the control section 50 a pilot valve is a known device which can be used to.