Measuring and testing – Borehole or drilling – Downhole test
Patent
1979-01-15
1980-11-18
Ciarlante, Anthony V.
Measuring and testing
Borehole or drilling
Downhole test
E21B 4900
Patent
active
042338395
ABSTRACT:
The determination of a "composite" parameter of the formation water in formations surrounding a borehole, for example the composite conductivity of the formation water, is used in the disclosure to obtain a relatively accurate determination of formation characteristics, such as water saturation. The determined values are meaningful even in shaly regions of the formations. In contrast to past approaches which attempted to determine the volume and distribution type of shale or clay present in the formations and then introduce appropriate factors which often involve substantial guesswork, the disclosed technique determines a composite water parameter, for example a composite water conductivity, which represents the conductivity of the bulk water in the formations, including both free water and bound water. Bound water trapped in shales is accounted for in this determination so unlike prior techniques, the shales can be considered as having a porosity. Having determined the composite water conductivity, water saturation can be directly obtained using relatively straightforward relationships which do not require estimates of the volume of shale in the formations. Shale effects are accounted for by the different conductivities (or other parameter such as capture cross sections) of the formation water constituents (free and bound) which make up the total water.
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Porosity--resistivity Cross--plots Can Help to Evaluate Formations, William H. Lang, Jr., The Oil and Gas Journal, Nov. 29, 1976.
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Electrical Conductivities in Oil--Bearing Shaly Sands, Monroe Waxman et al., Society of Petroleum Engineers Journal, Jun., 1968.
Ciarlante Anthony V.
Garrana Henry N.
Novack Martin M.
Olsen Kenneth
Schlumberger Technology Corporation
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