Apparatus and method for in situ controlled heat processing of h

Details Apparatus and method for in situ controlled heat processing of h Apparatus and method for in situ controlled heat processing of h

1982-11-30

1985-02-12

Suchfield, George A.

Wells

Processes

Electric current or electrical wave energy through earth for...

166 60, 166245, 166302, 219 1081, 219 1075, 219 1043, E21B 4324, E21B 3604

Patent

active

044985355

ABSTRACT:
A system and method provide for preferential in situ heating of earth formations. A plurality of elongated conductive electrodes are emplaced in earth formations in respective spaced rows bounding a particular volume of the earth formations and forming a transmission line, preferably a triplate line, extending in the direction of the electrodes with the particular volume of the earth formations providing a dielectric medium between respective rows of electrodes. Electromagnetic energy is supplied to the transmission line at a frequency at which the spacing between respective rows is less than about twice the skin depth at the frequency of the applied energy. Reactance means are disposed along respective electrodes to provide predetermined effective transmission line characteristics to develop a predetermined heating pattern in the earth formations. The reactance means may be reactances disposed discretely between sections of respective electrodes. The reactance means may also be disposed between respective electrodes and the earth formation, as by a dielectric coating. A heating pattern may be developed to heat hydrocarbon rich deposits preferentially.

REFERENCES:
patent: Re30738 (1981-09-01), Bridges et al.
patent: 4135579 (1979-01-01), Rowland et al.
patent: 4140179 (1979-02-01), Kasevich et al.
patent: 4140180 (1979-02-01), Bridges et al.
patent: 4144935 (1979-03-01), Bridges et al.
patent: 4193451 (1980-03-01), Dauphine
patent: 4373581 (1983-02-01), Toellner
Mining Engineering, "RF Technology said to Offer Advantages in Shale Oil Recovery" Industry Newswatch, Jul. 1978, p. 735.

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