Patent ID: 9447788
Filing Date: 2016-09-20
CPC Classification: F04B,F04D,F15B

Claim Text:
1. A linear pump for pumping production fluids from a well, the linear pump comprising: an electric motor; a rotary-to-linear mechanism coupled to the electric motor, wherein the rotary-to-linear mechanism converts rotary motion from the electric motor into linear motion in an upward direction or downward direction; a lubrication region for the linear pump, wherein the lubrication region contains lubrication fluid for the linear pump that is isolated from the production fluids; a pump plunger coupled to the rotary-to-linear mechanism, wherein the pump plunger moves in the upward or downward direction in accordance with the rotary-to-linear mechanism; an intake coupled to the pump plunger for receiving the production fluids from the well; a pump barrel receiving the production fluids, wherein the pump plunger reciprocates back and forth in the pump barrel to pump the production fluids; a pressure compensation tubular disposed between the rotary-to-linear mechanism and the pump plunger; a piston disposed within the pressure compensation tubular, wherein the piston separates the lubrication fluid from the production fluids, and the piston is movable within the pressure compensation tubular to compensate for a pressure differential between the lubrication fluid and the production fluids; and an encapsulator tubular with a first end coupled to the rotary-to-linear mechanism and a second end coupled to the pressure compensation tubular, wherein an internal region of the encapsulator tubular is in fluid communication with the lubrication region of the linear pump containing the lubrication fluid.