Controlling and assessing pressure conditions during treatment of tar sands formations
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United States of America Patent
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Nov 10, 2015
Grant Date -
Dec 31, 2009
app pub date -
Apr 18, 2008
filing date -
Apr 20, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method for treating a tar sands formation includes providing heat to at least part of a hydrocarbon layer in the tar sands formation from a plurality of heaters located in the formation. Heat is allowed to transfer from the heaters to at least a portion of the formation. A pressure in the portion of the formation is controlled such that the pressure remains below a fracture pressure of the formation overburden while allowing the portion of the formation to heat to a selected average temperature of at least about 280° C. and at most about 300° C. The pressure in the portion of the formation is reduced to a selected pressure after the portion of the formation reaches the selected average temperature.
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