In situ production of synthesis gas from a hydrocarbon containing formation, the synthesis gas having a selected H2 to CO ratio
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United States of America Patent
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May 11, 2004
Grant Date -
Nov 21, 2002
app pub date -
Apr 24, 2001
filing date -
Apr 24, 2000
priority date (Note) -
Expired
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Abstract
A hydrocarbon containing formation may be treated using an in situ thermal process. A mixture of hydrocarbons, H.sub.2, 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 H.sub.2 to CO ratio. A second portion of a formation may generate synthesis gas having a H.sub.2 to 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 H.sub.2 to CO ratio.
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