既有裂缝下高压电脉冲-水力压裂联合 破岩裂缝演化

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中图分类号：TE242 文献标志码：A

Abstract： To address the problem that the fracturing effect of the combined high-voltage electric pulsehydraulic fracturing technology is limited when encountering cemented natural fractures，based on the energy release rate theory，a fluid-solid coupling model for rock breaking by the combined high-voltage electric pulse-hydraulic fracturing， which incorporates cemented natural fractures， was established. Considering the interaction between cemented natural fractures and hydraulic fractures， the effects of different principal stress differences， intersection angles between hydraulic fractures and natural fractures， and voltage on fracture propagation were studied. The results demonstrate that under conditions of principal stress difference less than 10MPa and intersection angle less than 30∘ ， highvoltage electric pulse fracturing increases fracture width by approximately 25% compared to conventional hydraulic fracturing. At low principal stress differences， hydraulic fractures propagate along natural fractures， while at high principal stress differences，they penetrate through natural fractures and extend in the direction of maximum principal stress. When the intersection angle is small natural fractures are more readily activated and extend along their original orientation. Within a voltage range of 1～5kV ， the total fracture width increase reaches approximately 94% ， with natural fractures becoming significantly more susceptible to activation. These findings provide theoretical foundation and technical guidance for applying high-voltage electric pulse and hydraulic fracturing technology in practical engineering to enhance resource extraction efficiency in complex subsurface formations.

Keywords： high-voltage electric pulse rock breaking; hydraulic fracturing; energy release rate; natural fractures; fracture evolution

近年来，非常规油气资源的开发利用逐渐成为我国经济发展的重要组成部分，然而，复杂的地质环境（如岩溶地区、高应力区以及冻土区等）导致破岩难度逐渐增大[1]。（剩余11957字）