Method and apparatus for heating subsurface soil for decontamination
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United States of America Patent
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Nov 16, 1993
Issued Date -
N/A
app pub date -
Mar 12, 1991
filing date -
Feb 5, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique for in situ decontamination of an earth formation. High gas temperatures can be achieved at subsurface formations by supplying a fuel at a subsurface location, such as at the bottom of a wellbore. Pressurized air or gas preheated to a temperature of about 700.degree. F.-1200.degree. F. is supplied to the wellbore to ignite the fuel. The combustion heat produced by the fuel further heats the preheated gas to temperatures in the range of 1200.degree. F.-4500.degree., which heated gases are forced out of the borehole into the contaminated formation. Contaminants are thereby volatilized or oxidized and removed from the formation to the surface.
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