Method of yielding oil residues or oil containing liquids from contaminated ground layers
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United States of America Patent
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-
Jan 24, 1989
Grant Date -
N/A
app pub date -
May 19, 1993
filing date -
May 23, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of yielding oil residues or oil containing liquids from contaminated ground layers, includes forming at least two adjacent bore holes in a contaminated ground region, producing connecting passages between the bore holes by loosening and partially rinsing out components of a ground material which surrounds the bore holes and directing a liquid in at least one of the bore holes; applying an underpressure in at least one of the bore holes for aspirating the liquid upwardly, supplying a fluid in at least another one of the bore hole with maintaining a pressure difference between the bore holes, and aspirating in the bore hole under pressure oil separated from the liquid in a raised liquid column or an oil containing cover layer of the liquid column.
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