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| Number | Title | Issue Date |
| 7322415 | Subterranean electro-thermal heating system and method A subterranean electro-thermal heating system including one or more heater cable sections extending through one or more heat target regions of a subterranean environment and one or more cold lead sections coupled to the heater cable section(s) and extending through ... | 01/29/2008 |
| 5907662 | Electrode wells for powerline-frequency electrical heating of soils An electrode well for use in powerline-frequency heating of soils for decontamination of the soil. Heating of soils enables the removal of volatile organic compounds from soil when utilized in combination with vacuum extraction. A preferred embodiment of ... | 05/25/1999 |
| 5829519 | Subterranean antenna cooling system The present invention provides a system for cooling antenna assemblies, such as subterranean RF antennas used to heat geological formations. The invention generally includes a radio frequency (RF) generator, a waveguide operatively connected to the RF gen... | 11/03/1998 |
| 5619611 | Device for removing downhole deposits utilizing tubular housing and passing electric current through fluid heating medium contained therein A device for removing deposits such as asphalt, hydrates, and paraffins from petroleum and natural gas production strings and pipelines include a tubular housing divided into a heating section at a forward end and a ballast section at a rear end, the heat... | 04/08/1997 |
| 5539853 | Downhole heating system with separate wiring cooling and heating chambers and gas flow therethrough An electric downhole heating system for formation heat treatment in the field of oil and gas production contains a separate wiring chamber, heating chamber, and cooling chamber, the latter being inserted between the wiring chamber and the heating chamber.... | 07/23/1996 |
| 5126037 | Geopreater heating method and apparatus A separate heat source, such an a skin effect heater, is added to a subterranean heat exchanger and oxygen combustion device for upgrading viscous crude oil feeds. An insulated wire is integrated with combustion oxygen supply piping to form the skin effec... | 06/30/1992 |
