Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1993-10-18
1995-08-22
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
73155, G01N 1508, E21B 4900
Patent
active
054429501
ABSTRACT:
Methods and apparatus are provided for determining the pore volume compressibility, the porosity at stress and the relative porosity change of reservoir rock samples. In accordance with the invention, as few as two pore volume measurements of reservoir rock samples are obtained at simulated overburden pressures and relatively low pore pressure. From these data, a bi-logarithmic plot of pore volume versus pressure for a given reservoir rock sample is prepared. From the slope of the plot, pore volume compressibility of the reservoir rock sample at a given overburden pressure is directly calculated. In a further aspect, the intercept of the pore volume versus pressure plot is obtained, and, in conjunction with a measurement of the grain volume of the sample, the porosity at stress and relative porosity change of the rock sample are determined.
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Swalwell Terry J.
Unalmiser Servet
Saudi Arabian Oil Company
Wiggins J. David
Williams Hezron E.
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