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Probing the Mechanical Properties of Shales by Nanoindentation

机译：通过纳米压痕探测页岩的力学性能

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Nanoindentation testing was performed on 121 fractured core and drill cutting shale samples to investigate the mechanical properties of samples. With a twofold goal to examine the possibility of obtaining mechanical properties from small intact core fragment and to hereafter establish an understanding for upscaling relationship between cuttings and cores. A new hardness-based method for clay matrix is proposed to reasonably process and interpret indentation data. Results reveal that the clay matrix's mechanical properties including Young's modulus, hardness, and fracture toughness can be obtained. Such a hardness-based method for processing indentation data proves to be convenient and feasible. Weak anisotropy is observed for the studied shale samples. The fracture toughness exhibits stronger anisotropy. Comparison of the results from fractured core blocks and shale cuttings shows encouraging agreement in their mechanical properties, hence intact drill cuttings may be advantageously used for nanoindentation testing in cases where intact core samples are unavailable.
机译：对121个破裂的岩心和钻切页岩样品进行了纳米压痕测试，以研究样品的力学性能。为了达到双重目的，研究了从完整的小岩心碎片中获得机械性能的可能性，并在此后建立了对钻屑与岩心之间扩大关系的理解。提出了一种新的基于硬度的黏土基体方法，以合理地处理和解释压痕数据。结果表明，可以获得粘土基质的机械性能，包括杨氏模量，硬度和断裂韧性。这样的基于硬度的压痕数据处理方法被证明是方便和可行的。对于研究的页岩样品，观察到弱的各向异性。断裂韧性表现出较强的各向异性。对裂开的岩心块和页岩屑的结果进行比较表明，它们的力学性能令人鼓舞，因此，如果没有完整的岩心样品，完整的钻屑可有利地用于纳米压痕测试。

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