Progressive fluid sampling for boreholes
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United States of America Patent
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Jan 3, 1995
Grant Date -
N/A
app pub date -
Mar 2, 1994
filing date -
Mar 2, 1994
priority date (Note) -
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Abstract
An everting membrane assembly defines a constant volume for traveling along a generally horizontal borehole, pipe, or the like, having two accessible ends, for sampling within the borehole on a continuous basis. A first everting membrane carries an extraction tube through the borehole. A second everting membrane contains a perforated pipe for attachment to the extraction tube. As the first membrane is inverted back through the borehole, the second membrane is everted, forming a sampling volume therebetween with the perforated pipe exposed in the sampling volume for withdrawing fluids through the extraction tube for analysis.
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