Stochastic Analysis of Core Discing for Estimation of In Situ Stress |
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| Authors: | Andrew P Bunger |
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| Institution: | (1) CSIRO Petroleum, Melbourne, Australia |
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| Abstract: | Extraction of diamond-drilled core from high stress environments can result in the core breaking into discs. Through four
decades of research, a variety of computational tools and experimental approaches have been used to analyze the details of
the failure processes leading to core-discing-type breakage of diamond-drilled cores. One motivation for this research is
to use these calculations for stress estimation based on, for example, the disc length (i.e., thickness) measured in a particular
core. This application requires that the core discs lengths do not deviate much from an average or typical value. This paper
presents a stochastic approach, based on analyzis of the entire distribution of disc lengths, that provides a basis for application
of existing core discing models even when it is unclear how to define a typical disc length, for example when the disc length
distribution is highly non-Gaussian. The viability of the stochastic approach is demonstrated by comparison with data collected
from 900 m of core extracted from a South Australian granite formation. |
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