In situ production of synthesis gas from a coal formation,...

Wells – Processes – In situ combustion

Reexamination Certificate

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C166S250150, C166S261000, C166S267000, C166S302000, C048S127300, C048SDIG006, C208S108000, C208S134000, C518S703000, C518S704000

Reexamination Certificate

active

06880635

ABSTRACT:
A coal formation may be treated using an in situ thermal process. A mixture of hydrocarbons, H2, and/or other formation fluids may be produced from the formation. Heat may be applied to the formation to raise a temperature of a portion of the formation to a pyrolysis temperature. A portion of a formation may be heated from a plurality of heat sources to a temperature sufficient to allow generation of a first synthesis gas having a low H2to CO ratio. A second portion of a formation may generate synthesis gas having a H2to CO ratio greater than the first synthesis gas. A portion of the first synthesis gas may be blended with a portion of the second synthesis gas to produce a blend synthesis gas having a desired H2to CO ratio.

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