摘要：Radial jet drilling technique (RJD) has been identified as a cost-effective way of exploiting geothermal energy from hot dry rock (HDR). The swirling impeller nozzle is expected to drill large diameter radial branches in HDR. However, the swirling impeller water jet (SWJ) is difficult to break hard granite. Here, we investigate swirling impeller abrasive water jet (SAWJ) as an alternative jet type for drilling laterals in HDR reservoirs. We conducted comparative experiments to evaluate its rock-breaking performances on granite. Scanning electron microscope and 3D profiler were performed to observe the macro and micro-morphology of jet-drilled holes. Results show that SAWJ can efficiently create a large and regular hole with smooth walls that completely satisfies the re-quirements of drilling laterals in granite. The longitudinal sections of the SAWJ-drilled holes were "W" shaped. With the erosion of SAWJ, the generation of the conical bulge reached a state of dynamic balance. A large number of craters were formed through the impact of the abrasive particles. In addition, tensile cracks were found within the craters thereby improving the rock-breaking performance of the SAWJ over the SWJ technique. Interestingly, this is the first study to illustrate the feasibility of SAWJ drilling in hard rocks. The research results are expected to provide a viable alternative for effective RJD operation and optimal exploitation of geothermal resources in HDR.

关键字：Enhanced geothermal system; Abrasive water jet; Swirling impeller nozzle; Granite -breakage

ISSN号：1365-1609

卷、期、页：卷: 159

发表日期：2022-11-01

影响因子：7.135100

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）

发表期刊名称：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

参与作者：李晓静

通讯作者：李欢,姜天文,陈健翔

第一作者：黄中伟,李敬彬

论文类型：期刊论文

论文概要：李欢,黄中伟,李敬彬,李晓静,姜天文,陈健翔，Rock breaking characteristics by swirling impeller abrasive water jet (SAWJ) on granite，INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES，2022，卷: 159

论文题目：Rock breaking characteristics by swirling impeller abrasive water jet (SAWJ) on granite