E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/24 (2006.01) E21B 36/04 (2006.01)
Patent
CA 2152520
The invention relates to an A.C. electrical heating system for heating a fluid reservoir in the vicinity of a mineral fluid well, utilizing A.C. electrical power in a range of 25 Hz to 30 KHz. The well comprises a borehole extending down through an overburden and through a subterranean fluid (oil) reservoir; the well has a casing that includes an upper electrically conductive casing around the borehole in the overburden, at least one electrically conductive heating electrode located in the reservoir and an electrically insulating casing interposed between the upper casing and the heating electrode. An electrically isolated conductor such as a conductive production tubing extends down through the casing. The heating system comprises an electrical A.C. power source having first and second outputs, a downhole voltage-reducing impedance transformation network having a primary and a secondary, primary connection means connecting the primary of the transformation network to the first and second ouputs of the power source and secondary connection means connecting the secondary of the transformation network to the heating electrode.
Borden Ladner Gervais Llp
Uentech Corporation
LandOfFree
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