Evaluation of rock mechanical parameters using nanoindentation

WANG Junwei , CHE Mingguang 2, , SONG Xiao , SU Jian , and ZHANG Jian 4 1) Liaohe Oil Company of PetroChina, Panjin 114010, Liaoning Province, P. R. China 2) Research Institute of Petroleum Exploration and Development PetroChina, Beijing 100083, P. R. China 3) University of Science and Technology of China, Hefei 230026, Anhui Province, P. R. China 4) Great Wall Drilling Company of CNPC, Weiyuan 642450, Sichuan Province, P. R. China Abstract: To evaluate the reliability of obtaining rock mechanics parameters and calculating the rock brittleness index using small core samples, the nanoindentation technology is applied to obtain mechanical parameters with the small-scale core samples or cuttings of 1 mm × 1 mm. Before nanoindentation testing, the mineral phase analysis is carried out. The scale is upgraded by the convolution method to obtain the micromechanical parameters. Compared with the mechanical experimental results of nanoindentation, the absolute error is less than 10%, which meets the needs of brittleness index calculation. The proposed method can obtain rock mechanical parameters using broken core samples or cuttings, providing a new technical method for obtaining experimental parameters for brittleness evaluation.