Corrosion inhibition method and apparatus for downhole...

Details Corrosion inhibition method and apparatus for downhole... Corrosion inhibition method and apparatus for downhole...

H - Electricity

05

B

309/6

H05B 3/60 (2006.01) E21B 36/04 (2006.01) E21B 41/02 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2012328

Method and apparatus for corrosion inhibition in an electromagnetic heating system for heating a portion of a mineral fluid deposit adjacent an oil well or other mineral fluid well, in situ. The preferred apparatus includes a power source, that develops a high amperage heating current, over 100 amperes, at a heating frequency usually in a range of from 0.01 Hz or lower to 35 Hz, in a heating circuit that includes a main heating electrode downhole of the well and a return electrode. The power source also supplies a very low amplitude, controlled D.C. bias current to those electrodes, maintaining the main electrode at a neutral or negative polarity for corrosion protection. The D.C. bias current is monitored and maintained below a given minimum level, usually about one ampere, to extend the effective life of the return electrode and to minimize corrosion protection costs.

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