Processing hydrocarbons and Debye frequencies
View Patent ↗A medium ( 24 and 124 ) made up of fossil fuel hydrocarbons ( 304 ) is heated by maintaining at least a portion or area of the medium ( 334 ) in an alternating current electrical field ( 36 and 136 ) provided by a radio frequency signal at a radio frequency that matches a Debye resonance frequency or frequencies of one or more components of the medium ( 334 ). As the medium ( 334 ), or as at least one individual component of the medium ( 334 ) increases in temperature, the frequency of the radio frequency signal is automatically adjusted to track changes in the Debye resonance frequency, which shifts in frequency as the temperature rises. Portions, areas and/or individual chemical compositions of the medium ( 334 ) can be heated, by the use of grid electrodes ( 22, 22, 120, 124 ), at different rates to assure uniform temperature increases or to achieve a particular desired warming pattern.
1. A method for heating a medium, said medium comprising fossil fuel related hydrocarbonaceous material selected from the group consisting of oil shale, tar sand, oil sand, coal, bitumen, heavy oil, crude petroleum, petroleum distillates, and/or kerogen, comprising:
maintaining said medium in an alternating electrical field provided by a radio frequency signal not greater than 300 MHz at a resonance frequency of said medium;
sensing the temperature of said medium to produce a sensor output signal; and
determining the resonance frequency which corresponds to the most recently sensed temperature by applying the sensor output signal to a computer which supplies resonance frequency vs. temperature information for said medium to produce a control signal output of the computer corresponding to the resonance frequency;
as said medium increases in temperature, adjusting the frequency of said radio frequency signal by the control signal output of the computer to match the resonance frequency for the most recently sensed temperature.
2. The method of claim 1 comprising providing said radio frequency signal at multiple radio frequencies which respectively correspond to Debye resonance frequencies of multiple components of said medium.
3. The method of claim 1 wherein:
said medium being exposed to a fluid carrier medium, said fluid carrier medium allowing passage of said radio frequency waveforms to penetrate and heat said medium; and
the frequency of said radio frequency signal is selected not to be a Debye resonance frequency of e said carrier medium.
4. The method of claim 1 wherein:
said medium being exposed to a fluid carrier medium, said fluid carrier medium allowing passage of said radio frequency waveforms to penetrate and heat said medium; and
the frequency of said radio frequency signal is selected to be a Debye resonance frequency of said carrier medium.
5. The method of claim 1 wherein the said radio frequency signal is not limited to being a radio frequency signal but instead an electromagnetic signal not greater than 10 GHz.
6. The method of claim 1 wherein said medium is located in a subterranean hydrocarbon-bearing formation.
7. The method of claim 6 wherein a desired compound within said medium forms a recoverable layer within said reservoir, and said recoverable layer can be extracted from said subterranean hydrocarbon-bearing formation, and said recoverable layer can be extracted to surface of earth.
8. The method of claim 1 wherein said medium undergoes pyrolysis.