Patent ID: 7275592

Claim:
An oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising: a) a tool body that is sized and shaped to be lowered into the production tubing string of an oil well; b) a casing and production tubing; c) a working fluid that can be pumped into the production tubing: d) a prime mover for pumping the working fluid; e) a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area; f) a pumping mechanism on the tool body, the pumping mechanism including a first impeller that is driven by the working fluid and a second impeller that is rotated by the first impeller, the second impeller pumping oil from the well via the tool body; g) wherein the working fluid flows downwardly through the first impeller; h) wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped; and i) wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area.