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Keywords: in-situ stress
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Proceedings Papers
First Field Test of the Dual Core-Bit Tool for Drilling Stress Record Cores at Kamioka Mine, Japan
Available to Purchase
Paper presented at the SPWLA 25th Formation Evaluation Symposium of Japan, September 25–26, 2019
Paper Number: SPWLA-JFES-2019-K
... ABSTRACT We have developed a tool to drill core samples which is recording in-situ stress information around a bottom of a borehole. When the core is cut from the bedrock, it is released from the in-situ stress and expands slightly in the radial direction. Using this principle, the in-situ...
Proceedings Papers
Elastic Deformation of Core Sample With Stress Relief by Drilling and Its Application to Rock Stress Estimation
Available to Purchase
Paper presented at the SPWLA 23rd Formation Evaluation Symposium of Japan, October 11–12, 2017
Paper Number: SPWLA-JFES-2017-J
... Abstract When a piece of rock at depth is cut out to be a core sample by drilling, it becomes free from rock stresses and expand in radial direction. The expansion occurs in an asymmetric manner with the relief of anisotropic in-situ stresses, and it results in a sinusoidal variation of core...
