Method of developing subsurface freeze zone
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United States of America Patent
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Jan 31, 2012
Grant Date -
Apr 15, 2010
app pub date -
Dec 15, 2009
filing date -
Oct 13, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A method of lowering the temperature of a subsurface formation, e.g., comprising oil shale, includes injecting a cooling fluid under pressure into a wellbore. The wellbore is completed at or below a depth of the subsurface formation, and the wellbore includes a bore formed through the subsurface formation defining a diameter. The cooling fluid comprises a slurry having particles of frozen material. The cooling fluid is circulated across the formation in order to lower the temperature of at least a portion of the formation to a point that is at or below the freezing point of water.
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