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2015 | OriginalPaper | Chapter

13. Nanoindentation Measurements on Rocks

Authors : Priyavrat Shukla, Shantanu Taneja, Carl Sondergeld, Chandra Rai

Published in: Fracture, Fatigue, Failure, and Damage Evolution, Volume 5

Publisher: Springer International Publishing

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Abstract

Young’s modulus and hardness of shale are important parameters for the design of hydraulic fractures and the selection of proppant. Nanoindentation has shown applicability in fine grained rocks and provides a method to measure these parameters using core fragments and drill cuttings. Nanoindentation measurements on horizontal and vertical samples can be used to quantify anisotropy. Indentation Young’s modulus correlates well with dynamic modulus obtained from acoustic velocity data on core plugs. Nanoindentation is thus a viable method to measure mechanical properties of fine grained shale. Young’s moduli obtained by nanoindentation are related to composition and porosity, e.g., total organic carbon (TOC), porosity and mineralogy. Young’s modulus showed a trends with both TOC and porosity and warrants further study to establish more robust relationships. The primary aim of this paper is to study the applicability of nanoindentation to shale and this is established by comparing nanoindentation results with standard dynamic pulse-transmission velocity measurements. Nanoindentation on Wolfcamp shale, Lyons sandstone, Sioux quartzite, Indiana limestone and pyrophyllite was performed to test whether the nanoindentation test gives representative results of the whole sample with variation in grain size. The experimental results indicate that nanoindentation measures the grain Young’s modulus due to all indentations on a single grain for coarse grained rocks and thus, resulting in incorrect Young’s modulus of rock. However, for rock with smaller grain (<indenter area), nanoindentation results are representative of multiple grains and hence correlating well with the dynamically determined Young’s modulus.

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Metadata
Title
Nanoindentation Measurements on Rocks
Authors
Priyavrat Shukla
Shantanu Taneja
Carl Sondergeld
Chandra Rai
Copyright Year
2015
DOI
https://doi.org/10.1007/978-3-319-06977-7_13

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