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US 7,453,266 B2Granted
Electronic humidity chamber for vapor desorption to determine high capillary pressures
OwnerPatrick M. Laswell, Kent E. Newshaminventors
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Abstract
The present invention relates to the use of an electronically controlled humidity chamber with temperature controls: to determine, by vapor desorption, high capillary pressures of core samples; to produce core samples with a high capillary pressure for testing electrical properties; and, using a curve of high capillary pressures from vapor desorption data, to transform a curve of high capillary pressures determined from high pressure mercury injection.
Claims2
A method for determining an electrical property of a core sample having a capillary pressure above about 4200 psi, comprising the steps:
- drying the core sample,
- weighing the core sample,
- saturating the core sample with a brine solution,
- weighing the core sample,
- calculating the brine volume,
- placing the core sample in an electronically controlled humidity chamber with temperature controls,
- setting a humidity level in the humidity chamber at about 80% or lower,
- periodically weighing the core sample to determine when equilibrium water saturation is achieved at the humidity level,
- calculating the capillary pressure at or above about 4200 psi, and
- measuring an electrical property of the core sample.
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Dependencies are inferred from the claim text.