Measuring and testing – Borehole or drilling – Downhole test
Patent
1989-07-10
1990-06-26
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
175 40, E21B 4910
Patent
active
049361392
ABSTRACT:
The apparatus of the present invention relates to a down hole tool capable of extraction of valid samples and making pressure measurements useful in calculating formation permeability. The tool incorporates the features of a straddle packer to allow formation fluid specimens to be taken at large flow rates without depressing the pressure below the formation fluid bubble point. When used in combination with a pressure probe the tool is used to obtain meaningful permeability readings in a larger radius area than previously permitted with known designs. Additionally, the apparatus of the present invention allows flow control during the creation of the pressure pulse which enhances extraction of valid samples and the permeability determination. The apparatus may be modularly constructed so that in a single descent of the tool, a pressure profile of the zone of interest can be made, a fluid analysis can be made at each station, multiple uncontaminated fluid samples can be withdrawn at pressures above the bubble point, local vertical and horizontal permeability measurements can be made at each station, a packer module can be set at a location dictated by previous measurements and a large scale pressure build up test can be performed.
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Perkins Joseph L.
Pop Julian J.
Zimmerman Thomas H.
Garrana Henry N.
O'Shea Kevin D.
Schlumberger Technology Corporation
Wagret Frederic C.
Williams Hezron E.
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