Method for in situ heat processing of hydrocarbonaceous formatio

Details Method for in situ heat processing of hydrocarbonaceous formatio Method for in situ heat processing of hydrocarbonaceous formatio

1977-08-29

1979-02-20

Novosad, Stephen J.

Wells

Processes

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

166 60, 166 65R, 166245, 166272, E21B 4324

Patent

active

041401808

ABSTRACT:
The disclosure describes a technique for uniform heating of relatively large blocks of hydrocarbonaceous formations in situ using radio frequency (RF) electrical energy that is substantially confined to the volume to be heated and effects dielectric heating of the formations. An important aspect of the disclosure relates to the fact that certain hydrocarbonaceous earth formations, for example raw unheated oil shale, exhibit dielectric absorption characteristics in the radio frequency range. In accordance with the system of the invention, a plurality of conductors are inserted in the formations and bound a particular volume of the formations. The phrase "bounding a particular volume" is intended to mean that the volume is enclosed on at least two sides thereof. Electrical excitation is provided for establishing alternating electric fields in the volume. The frequency of the excitation is selected as a function of the dimensions of the volume so as to establish a substantially non-radiating electric field which is substantially confined in the volume. In this manner, volumetric dielectric heating of the formations will occur to effect approximately uniform controlled heating of the volume.

REFERENCES:
patent: 2685930 (1954-08-01), Albaugh
patent: 2757738 (1956-08-01), Ritchey
patent: 3133592 (1964-05-01), Tomberlin
patent: 3169577 (1965-02-01), Sarapuu
patent: 3170519 (1965-02-01), Haagensen
patent: 3208674 (1965-09-01), Bailey
patent: 3954140 (1976-05-01), Hendrick
Fu, "Gasification of Fossil Fuels in a Microwave Discharge in Argon", Chemistry and Industry, 31 Jun. 1971, pp. 876-877.
Fu et al., "Pyrolysis of Coals in a Microwave Discharge", Industrial & Engineering Chemistry, Process Design and Development, vol. 8, No. 2, Apr. 1969, pp. 257-262.

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