Heating tar sands formations while controlling pressure
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United States of America Patent
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Jan 12, 2010
Grant Date -
Nov 13, 2008
app pub date -
Oct 19, 2007
filing date -
Oct 20, 2006
priority date (Note) -
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Abstract
Methods for treating a tar sands formation are described herein. Methods may include heating at least a section of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. A pressure in the majority of the section may be maintained below a fracture pressure of the formation. The pressure in the majority of the section may be reduced to a selected pressure after the average temperature reaches a temperature that is above 240° C. and is at or below pyrolysis temperatures of hydrocarbons in the section. At least some hydrocarbon fluids may be produced from the formation.
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