Mineral well heating systems

Wells – With heating – refrigerating or heat insulating means – Electrical heater in well

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Details

166304, 166902, 166 62, 219277, E21B 3600, E21B 4300

Patent

active

047903759

ABSTRACT:
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.

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patent: 4522262 (1985-06-01), Perkins
patent: 4716960 (1988-01-01), Eastlund et al.
Production Increase of Heavy Oils by Electro Magnetic Heating, Abernethy, May 1974.
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AC Current Heats Heavy Oil for Extra Recovery, World Oil, May 1970.
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Unique Electrothermic Recovery Method gets Rocky Mountain Test, The Oil and Gas Journal, Dec. 1969.
Influence of Adjacent Conductive Formations on the Selective Electric Reservoir Heating Process, Society of Petroleum Engs., 10-1982.
Electroflood Proves Technically Feasible, Petroleum Engineer International, Jan. 1980.
Selective Electric Reservoir Heating, The Journal of Canadian Petroleum, Jul. 1979.
A Radial Model for Estimating Heat Distribution in Selective Electric Reservoir Heating, The Journal of Canadian Petro. 10-1980.
Well Stimulation by Downhole Thermal Methods, Petroleum Engineer, Oct. 1973.

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