Patent ID: 8960309
Filing Date: 2015-02-24
Classification: E21B,F01C,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, the tool body having an outer wall; b) a transverse portion dividing the toot body into upper and lower sections, the transverse portion being a seal that prevents fluid flow from the upper section to the lower section; c) spaced apart, longitudinally extending upper and lower openings in the tool body wall, each of said and upper and lower openings enabling flow to exit the tool body laterally; d) a casing and a production tubing; e) a working fluid that can be pumped into the production tubing; f) a prime mover for pumping the working fluid; g) 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; h) a pumping mechanism on the tool body that includes a rotary shaft, the pumping mechanism including a first impeller contained within said first upper section that is driven by the working fluid and a second impeller contained within said lower section that is mounted for rotation on said shaft with and is rotated by the first impeller, the second impeller pumping oil from the well via the toot body lower longitudinally extending opening; i) wherein the working fluid flows downwardly in the tool body and then laterally through the first impeller and upper longitudinally extending opening; j) wherein oil flows laterally through the second impeller and exits the tool body via the lower, longitudinally extending opening; k) wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped; l) wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area; and m) wherein the said shaft extends through the transverse portion and the shaft does not convey working fluid from the upper section to the lower section.