04694907 is referenced by 301 patents and cites 4 patents.

A thermally-enhanced oil recovery method and apparatus for exploiting deep well reservoirs utilizes electric downhole steam generators to provide supplemental heat to generate high quality steam from hot pressurized water which is heated at the surface. A downhole electric heater placed within a well bore for local heating of the pressurized liquid water into steam is powered by electricity from the above-ground gas turbine-driven electric generators fueled by any clean fuel such as natural gas, distillate or some crude oils, or may come from the field being stimulated. Heat recovered from the turbine exhaust is used to provide the hot pressurized water. Electrical power may be cogenerated and sold to an electric utility to provide immediate cash flow and improved economics. During the cogeneration period (no electrical power to some or all of the downhole units), the oil field can continue to be stimulated by injecting hot pressurized water, which will flash into lower quality steam at reservoir conditions. The heater includes electrical heating elements supplied with three-phase alternating current or direct current. The injection fluid flows through the heater elements to generate high quality steam to exit at the bottom of the heater assembly into the reservoir. The injection tube is closed at the bottom and has radial orifices for expanding the injection fluid to reservoir pressure.

Title
Thermally-enhanced oil recovery method and apparatus
Application Number
6/832267
Publication Number
4694907
Application Date
February 21, 1986
Publication Date
September 22, 1987
Inventor
Christian W Knudsen
Houston
TX, US
Michael A Gibson
Houston
TX, US
Charles R Stahl
Scotia
NY, US
Agent
Neal J Mosely
Assignee
Carbotek
TX, US
IPC
E21B 43/24
E21B 36/04
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