Li Wei, Li Zhuolun, Li Ying, Zhao Huan, Wang Shuangyang, Xu Xingsheng, Kong Jiahao
Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.
State Key Laboratory of Continental Shale Oil, Daqing, China.
PLoS One. 2025 Jul 22;20(7):e0328782. doi: 10.1371/journal.pone.0328782. eCollection 2025.
Fracturing technology is an important technique in the development of shale reservoirs. Compared with conventional hydraulic fracturing, explosive fracturing technology has the advantages of low cost and environmental protection. Relevant research results have shown that this technology can effectively improve the efficiency of shale oil and gas extraction. To further reveal the mechanism of reservoir fracture propagation under explosive fracturing, this paper conducted experimental research on the propagation law of complex fractures in shale reservoirs under impact load. The dynamic elastic modulus of shale samples was tested by using the Split Hopkinson Pressure Bar (SHPB) test system. A finite element model was established by using LS-DYNA software. Based on test results, the fracture propagation process was simulated under different impact loads, interlayer spacing, and fracture distribution conditions. The results indicate that the original crack zone of layered reservoirs is more prone to induce stress, which is beneficial for reservoir transformation in the near wellbore area, while explosive fracturing. The increase in interlayer spacing is beneficial for the expansion of the main crack, which can improve reservoir connectivity. As the impact load increases, the main cracks have better connectivity. This study can provide a theoretical basis for optimizing fracturing parameters and designing fracturing schemes, which is of great significance for the promotion of explosive fracturing technology and the efficient and environmentally friendly development of shale oil.
压裂技术是页岩油藏开发中的一项重要技术。与传统水力压裂相比，爆炸压裂技术具有成本低和环保的优势。相关研究结果表明，该技术能够有效提高页岩油气开采效率。为进一步揭示爆炸压裂作用下油藏裂缝扩展机理，本文针对冲击载荷作用下页岩油藏复杂裂缝扩展规律开展了实验研究。利用分离式霍普金森压杆（SHPB）试验系统测试了页岩试样的动态弹性模量。采用LS-DYNA软件建立了有限元模型。基于试验结果，模拟了不同冲击载荷、层间距和裂缝分布条件下的裂缝扩展过程。结果表明，层状油藏原生裂缝区更容易诱发应力，有利于近井地带油藏改造，而爆炸压裂时，层间距增大有利于主裂缝扩展，可提高油藏连通性。随着冲击载荷的增加，主裂缝连通性更好。该研究可为优化压裂参数和设计压裂方案提供理论依据，对推动爆炸压裂技术及页岩油高效绿色开发具有重要意义。
