Patent ID: 7377312
Filing Date: 2008-05-27
Classification: F04C

Abstract:
1. 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 tool body has flow conveying portions that mix the working fluid and the oil as the working fluid and oil flow through the tool body in generally opposite directions; and h) wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area.