04790375 is referenced by 63 patents and cites 7 patents.

Heating systems for mineral wells (e.g. oil wells) employ electrical power sources, sometimes operating at relatively high frequencies, that are connected to the well casing and production tubing so as to provide a coaxial line electrical heater projecting down into the well. The heating pattern of the coaxial line is effectively controlled so that most of the power is dissipated as heat, primarily in the tubing, above a depth D above which paraffins or other condensible constituents would tend to condense or otherwise impair the flow of mineral fluid up through the production tubing. The applied electrical power is controlled so that the fluid is kept approximately at or only somewhat above the flow impairment temperature for constituents of the fluid. In some embodiments the system is extended to provide heating of a portion of the deposit formation adjacent to the well.

Title
Mineral well heating systems
Application Number
7/123931
Publication Number
4790375
Application Date
November 23, 1987
Publication Date
December 13, 1988
Inventor
Homer L Spencer
Calgary
CA
Vincent R Young
Tulsa
OK, US
Guggilam C Sresty
Burbank
IL, US
Jack E Bridges
Park Ridge
IL, US
Agent
Kinzer Plyer Dorn McEachran & Jambor
Assignee
ORS Development Corporation
OK, US
IPC
E21B 43/00
E21B 36/00
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