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Influence factors of pop-in in the nanoindentation micromechanical property measurement of gas-bearing shale

  • Ligeng Wang , Yuanzhong Zhang and Wensheng Wu
Published/Copyright: September 26, 2019
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Abstract

Studying the micromechanical properties of gas-bearing shale is very important for understanding it. In the nanoindentation measurement of gas-bearing shale, the load-displacement curve often shows pop-in at the loading stage, namely the change of load is small but the change of penetration depth is large. Pop-in can introduce a large error in the calculation of the mechanical parameter. To investigate the influence factors of pop-in, the maximum load, load rate and sample characteristics have been addressed. The results show that pop-in is related to cracks and pores in the shale. Due to the heterogeneity of shale, pop-in cannot be avoided, but can be reduced by choosing reliable load modes and test parameters. Pop-in can increase the maximum indentation depth and decrease the elastic modulus and hardness. The influence of pop-in on hardness is larger than on the elastic modulus. At a high load rate it is easy to induce pop-in. The influence of the load rate on pop-in is larger than that of the maximum load.


Correspondence Address, Assoc. Prof. Dr. Yuanzhong Zhang, State Key Laboratory of, Petroleum Resources and Prospecting, China University of Petroleum Beijing, Beijing 102249, P. R. China, E-mail:

Ligeng Wang, born 1993, graduated from China University of Petroleum, Beijing in 2016 and received his Bachelor's Degree. Now he is a PHD Candidate at the China University of Petroleum, Beijing. His current research interests focus on petrophysics and logging interpretation.

Yuanzhong Zhang, born 1971, graduated from the China University of Petroleum, Beijing in 2000 and gained his PhD. Currently, he is an Associated Professor at the China University of Petroleum, Beijing. His current research interests focus on petrophysics and logging interpretation.

Wensheng Wu, born 1972, graduated from the China University of Petroleum (East China) in 2001 and received his PhD. Currently, he is a Professor at the China University of Petroleum, Beijing. His current research interests focus on nuclear logging.


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Published Online: 2019-09-26
Published in Print: 2019-10-02

© 2019, Carl Hanser Verlag, München

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