摘要：Hot dry rock (HDR) is an important global clean energy resource. However, the drilling process is difficult due to the hardness and abrasiveness of the rock. In this paper, the single PDC cutter tests were conducted to investigate the mechanism of rock breaking at different target temperatures (25-480℃). Besides, the effects of high-pressure water jet on the rock failure process were studied as well, which is of great importance to improve the efficiency of geothermal exploitation. The cutting force and the mechanical specific energy (MSE) were used to estimate the efficiency of rock breaking. At the same time, we measured the mass fraction of cuttings with different sizes and morphology of cutting grooves. The results show that micro-cracks would be induced when high-pressure water jet contact with the rock with high temperature. Consequently, the brittle failure dominates more easily and the mass fraction of chunk-like cuttings will increase. The topography of cutting grooves shows that the roughness of the rock surface increases significantly at higher temperatures. Meanwhile, the increase in the temperature of the rock will lead to a decrease in the cutting force and MSE. That is, the efficiency of rock breaking will be improved. The findings indicate that thermal stress plays an important role in assisting the process of HDR drilling. ? 2021 ARMA, American Rock Mechanics Association.

ISSN号：9781713839125

卷、期、页：v 2,

发表日期：2021-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：55th U.S. Rock Mechanics / Geomechanics Symposium 2021

通讯作者：代献伟,程镇

第一作者：黄中伟,史怀忠,熊超

论文类型：会议论文

论文概要：代献伟,黄中伟,史怀忠,熊超,程镇，Experimental analysis on rock failure mechanism under the joint action of cutting and jet impingement，55th U.S. Rock Mechanics / Geomechanics Symposium 2021，2021，v 2,

论文题目：Experimental analysis on rock failure mechanism under the joint action of cutting and jet impingement