Measuring and testing – Borehole or drilling – Formation logging
Patent
1996-03-27
1997-04-01
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Formation logging
7315216, 367 31, E21B 4900
Patent
active
056168403
ABSTRACT:
A method for modeling fracture zones in the sidewall of a borehole and for estimating the hydraulic conductivity thereof. The method first separates Stoneley wavefields into a directly-transmitted wavefield and a one-way (i.e. downgoing) reflected wavefield from which the depth configuration may be determined. The separated wavefields are corrected for the effects of borehole irregularity due to such effects as washouts and the like by numerically modeling Stoneley wave propagation using caliper and slowness measurements. The hydraulic conductivity is estimated from parameters derived from synthetic and measured Stoneley-wave data across the fracture zone in combination with measurements of the borehole radius.
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Tang, X.M., and Cheng, C.H.; Borehole Stoneley Wave Propagation Across Permeable Structures, Geophysical Prospecting 41, pp. 165-187 (1993).
Knox William A.
Politzer Jay L.
Western Atlas International
Williams Hezron E.
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