Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Reexamination Certificate
2008-10-15
2011-12-06
Fitzgerald, John (Department: 2856)
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
C166S264000
Reexamination Certificate
active
08069715
ABSTRACT:
A method and apparatus for collection of pore water samples from a subsurface geologic formation, especially a vadose zone formation having high capillary tension. The method consists of injection of a fluid with known tracer concentrations therein into the formation. The injected displacement fluid develops a wetting front which carries with it the ambient pore water. The mixture of pore water and tracer-bearing displacement fluid is absorbed by a collection system, such as an absorbent member or pumping system. The injection and collection system are attached to a sealing borehole liner for emplacement in a borehole in the formation, and for other functions. Water samples collected in the collector system may be recovered by inversion of the liner, or alternatively by pumping. Samples thus removed from the borehole may be evaluated for chemicals, such as contaminants. The use of the tracer permits pore water characteristics to be distinguished from the motivating displacement fluid. Apparatuses for performing the foregoing functions are described.
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Baker Rod D.
Fitzgerald John
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