Experimental determination of the biot elastic constant: Applications in formation evaluation (sonic porosity, rock strength, earth stresses and sanding predictions)
Conference
·
OSTI ID:207298
- SPE, Richardson, TX (United States); and others
An experimental method has been developed to obtain the {open_quotes}Biot elastic constant{close_quotes} of rocks from laboratory acoustic measurements. To date, the {open_quotes}Biot elastic constant{close_quotes} has never been determined experimentally. It has always been calculated using various empirical equations. The experimental determination of the Biot elastic constant is very important to engineering problems associated with sand control hydraulic fracturing, wellbore stability, earth stresses, ionic porosity and estimation of compressional (P) and shear (S) wave velocity. Both the dynamic and static moduli of actual reservoir sandstone core samples, jacketed and mounted in a triaxial cell under high vacuum (< 0.15 mbar), were measured at various confining and overburden pressures. The vacuum was obtained in-situ and maintained fill the end of the experiment. This vacuum-dry rock condition represents the dry skeletal frame of the rock. The bulk modulus of the dry skeletal frame of the rock (K{sub sk}) was calculated using the measured P- and S-wave velocities of the vacuum-dry rock. The rock matrix bulk modulus (K{sub sk}) was estimated by averaging the harmonic and arithmetic means of the constituent pure mineral moduli. The results obtained show that the Biot elastic constant is a complex function of porosity, permeability, clay content, pore-size distribution and overburden and confining pressure. The experimentally determined Biot constant values may be significantly different from those calculated using empirical equations. This experimental method suggests a new approach to quantifying the Biot elastic constant in the laboratory. This approach gave a better estimate of rock strength, earth stresses, sanding predictions, P- and S- wave velocities, porosity and pore-fluid from sonic and seismic data.
- OSTI ID:
- 207298
- Report Number(s):
- CONF-951002--
- Country of Publication:
- United States
- Language:
- English
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