Methods and apparatus to confine earth currents for recovery of

Details Methods and apparatus to confine earth currents for recovery of Methods and apparatus to confine earth currents for recovery of

1992-02-05

1995-05-30

Leung, Philip H.

Electric heating

Capacitive dielectric heating

Specific heating application

219778, 219780, 166248, 166 60, H05B 654

Patent

active

054204020

ABSTRACT:
Improved methods and apparatus are disclosed for confining ohmic heating currents to a subsurface formation in the use of in situ ohmic heating for recovery of volatile and semi-volatile materials, such as hazardous waste, hydrocarbon-like materials, and valuable minerals having thermally responsive properties. Spacing between emplaced electrodes and the number of electrodes employed are controlled to cause coupling between electrodes for more uniform and higher temperature heating. Electrode designs are disclosed which suppress spurious earth currents which would heat other formations not of interest. Suppression of electrode end currents is accomplished by the use of distinct rings of insulation, control of the applied potential along the electrode, and injection or withdrawal of fluids at distinct locations along the electrode.

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