Electric resistance heating devices – Heating devices – Borehole type
Patent
1990-11-07
1991-12-03
Reynolds, Bruce A.
Electric resistance heating devices
Heating devices
Borehole type
166 60, E21B 715, E21B 3604, H05B 302, H05B 378
Patent
active
050705334
ABSTRACT:
Electrical heating system for mineral wells, particularly oil wells, in which the reservoir or "pay zone" is heat stimulated or some well components (e.g., the tubing) are heated, or both, by electrical power supplied to a multi-perforate electrode have the operating efficiency enhanced by effectively terminating the heating electrode, at both its top and bottom, at a distance inwardly of the pay zone equal to at least three times the diameter of the well casing. In some systems the electrical power connection to the main heating electrode is made through a section of the production tubing of the well, with an electrical contactor interconnecting the tubing and the electrode in the level of the pay zone; these systems also provide electrical isolation, within critical height limits, for the production tubing and the pump rod. Delivery of electrical power downhole of the well may be accomplished through an electrical cable, which may or may not be appropriately armored. Specific electrode construction combine conductive and insulating materials to counteract galvanic corrosion while maintaining mechanical strength.
REFERENCES:
patent: 2276833 (1942-03-01), Germain
patent: 3113623 (1963-12-01), Krueger
patent: 3420301 (1969-01-01), Riley et al.
patent: 4012868 (1991-05-01), Bridges
patent: 4570715 (1986-02-01), Van Muers et al.
patent: 4790375 (1988-12-01), Bridges et al.
Bajzek Thomas J.
Bridges Jack E.
Hofer Kenneth E.
Smith Larry G.
Spencer Homer L.
Jeffery John A.
Reynolds Bruce A.
Uentech Corporation
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