摘要：By integrating laboratory physical modeling experiments with machine learning-based analysis of dominant factors, this study explored the feasibility of pulse hydraulic fracturing (PHF) in deep coal rocks and revealed the fracture propagation patterns and the mechanisms of pulsating loading in the process. The results show that PHF induces fatigue damage in coal matrix, significantly reducing breakdown pressure and increasing fracture network volume. Lower vertical stress differential coefficient (less than 0.31), lower peak pressure ratio (less than 0.9), higher horizontal stress differential coefficient (greater than 0.13), higher pulse amplitude ratio (greater than or equal to 0.5) and higher pulse frequency (greater than or equal to 3 Hz) effectively decrease the breakdown pressure. Conversely, higher vertical stress differential coefficient (greater than or equal to 0.31), higher pulse amplitude ratio (greater than or equal to 0.5), lower horizontal stress differential coefficient (less than or equal to 0.13), lower peak pressure ratio (less than 0.9), and lower pulse frequency (less than 3 Hz) promote the formation of a complex fracture network. Vertical stress and peak pressure are the most critical geological and engineering parameters affecting the stimulation effectiveness of PHF. The dominant mechanism varies with coal rank due to differences in geomechanical characteristics and natural fracture development. Low-rank coal primarily exhibits matrix strength degradation. High-rank coal mainly involves the activation of natural fractures and bedding planes. Medium-rank coal shows a coexistence of matrix strength degradation and micro-fracture connectivity. The PHF forms complex fracture networks through the dual mechanism of matrix strength degradation and fracture network connectivity enhancement.

关键字：deep coal-rock gas; pulse hydraulic fracturing; coal rank; fatigue damage; matrix strength degradation; break-down pressure; micro-fracture connectivity; complex fracture network

ISSN号：2096-4803

卷、期、页：卷52期4: 1074-1085

发表日期：2025-08-01

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）

发表期刊名称：PETROLEUM EXPLORATION AND DEVELOPMENT

通讯作者：陆美全,李敖,成浩瑾,井美洋

第一作者：杨睿月,黄中伟,李根生

论文类型：期刊论文

论文概要：杨睿月,陆美全,李敖,成浩瑾,井美洋,黄中伟,李根生，Fracture propagation and fatigue damage mechanisms in pulse hydraulic fracturing of deep coal，PETROLEUM EXPLORATION AND DEVELOPMENT，2025，卷52期4: 1074-1085

论文题目：Fracture propagation and fatigue damage mechanisms in pulse hydraulic fracturing of deep coal