Electric resistance heating devices – Heating devices – Borehole type
Patent
1995-05-18
1997-04-15
Leung, Philip H.
Electric resistance heating devices
Heating devices
Borehole type
392306, 392338, 219772, 219780, 166 60, H05B 303, H05B 654, E21B 3604
Patent
active
056218451
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.
REFERENCES:
patent: 4037655 (1977-07-01), Carpenter
patent: 4487257 (1984-12-01), Dauphine
patent: 4545435 (1985-10-01), Bridges et al.
patent: 4670634 (1987-06-01), Bridges et al.
patent: 4956535 (1990-09-01), Buelt et al.
patent: 5046559 (1991-09-01), Glandt
Bridges Jack E.
Sresty Guggilam C.
IIT Research Institute
Leung Philip H.
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