摘要：Imaging cracks is a direct way to learn the rock breaking mechanism beneath a PDC cutter. In this study, a series of linear cutting tests and precise observations of cracks were conducted. The formation of major cracks was captured in-situ with a high speed camera in the process of cutting rock sheets. Then the cracks under the cutting groove (subsurface cracks) were studied by reproducing the cutting groove after cuffing some rock blocks and further observed by means of thin-section optical microscopy. Finally, the development sequence of the cracks and adjacent crushed zone was determined by recording the cutting process on a rock-like silica glass block. The results show that the shape of major cracks is mainly curved, both upward and downward curves were observed. The major cracks mainly initiate at the tip of the cutter when cuffing sandstone and granite, while they initiate more randomly in marble. The length and angle of the subsurface cracks vary with the rocks: the subsurface cracks extend the longest in granite, while propagating more vertically in sandstone. Finally, it is determined that the major cracks initiate after the formation of crushed zone. And the initiation of major cracks will enlarge the crushed zone and lead to the initiation and propagation of the subsurface cracks. The results in this paper are expected to further reveal the rock breaking mechanism beneath a PDC cutter.

关键字：PDC bits Single cutter test Crack pattern Rock breaking mechanism

ISSN号：0920-4105

卷、期、页：卷: 179 页: 1151-1158

发表日期：2019-08-01

影响因子：1.873000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

通讯作者：程镇,代献伟,郭战胜

第一作者：盛茂,李根生,黄中伟,史怀忠

论文类型：期刊论文

论文概要：程镇,盛茂,李根生,黄中伟,史怀忠,代献伟,郭战胜，Cracks imaging in linear cutting tests with a PDC cutter: Characteristics and development sequence of cracks in the rock，JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING，2019，卷: 179 页: 1151-1158

论文题目：Cracks imaging in linear cutting tests with a PDC cutter: Characteristics and development sequence of cracks in the rock