Wells – With heating – refrigerating or heat insulating means – Electrical heater in well
Patent
1989-03-14
1990-04-24
Dang, Hoang C.
Wells
With heating, refrigerating or heat insulating means
Electrical heater in well
166 651, 166902, 204147, 204196, E21B 4324
Patent
active
049192019
ABSTRACT:
Corrosion inhibition apparatus in an electromagnetic heating system for in situ downhole heating in an oil well or other mineral fluid well that includes an A.C. power source for a high amperage, low frequency heating current (e.g. over 50 amperes at 0.01 to 35 Hz) and a D.C. bias source for generating a low amplitude (e.g., less than one ampere) current for corrosion inhibition, both sources connected to a downhole electrode. The bias source includes at least one semiconductor device, connected in the main A.C. heating circuit, in a bias circuit that develops a net D.C. voltage differential of the polarity required for corrosion inhibition in response to the A.C. heating current.
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Bajzek Thomas J.
Bridges Jack E.
Dubiel George T.
Dang Hoang C.
Uentech Corporation
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