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<p>Faced with the complex problem of fracture initiation and propagation in shale gas reservoirs caused by developed bedding planes, geomechanically parameter heterogeneity, and natural fracture anisotropy, existing commercial software and models fail to accurately describe fracture propagation laws due to insufficient consideration of bedding planes and reservoir anisotropy. Based on the lithological characteristics of shale, a mathematical model integrating wellbore pressure wave amplitude, reservoir perforation flow distribution friction, and pressure wave time-lag response constraints was established. By introducing a dynamic correction formula for perforation friction coefficients, the influence of proppant erosion on perforation flow coefficients was quantified. Taking a shale gas well (total depth 6530 m, horizontal section length 2130 m) as a case study, the evolution characteristics of fracture propagation volume under different pulse frequencies were simulated by integrating field fracturing parameters (displacement 11–18 m<sup>3</sup>/min, pulse frequency 0.001–0.7 Hz). The results show that there is a nonlinear correlation between pulse frequency and fracture propagation efficiency: the growth rate of fracture propagation volume is the highest at medium frequencies (0.3–0.5 Hz); excessively high frequencies (0.7 Hz) slow down the efficiency due to stress interference effects; and low frequencies (≤0.02 Hz) limit fracture extension due to insufficient stress disturbance.</p>

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Bedding Plane Effect and Pulsation Regulation Mechanism of Fracture Propagation in Shale Gas Reservoirs

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Xudong Zhang,
  • Zhou Jun,
  • Haoyu Sun,
  • Jinfu Li,
  • Zhili Chen,
  • Xiangwei Kong

摘要

Faced with the complex problem of fracture initiation and propagation in shale gas reservoirs caused by developed bedding planes, geomechanically parameter heterogeneity, and natural fracture anisotropy, existing commercial software and models fail to accurately describe fracture propagation laws due to insufficient consideration of bedding planes and reservoir anisotropy. Based on the lithological characteristics of shale, a mathematical model integrating wellbore pressure wave amplitude, reservoir perforation flow distribution friction, and pressure wave time-lag response constraints was established. By introducing a dynamic correction formula for perforation friction coefficients, the influence of proppant erosion on perforation flow coefficients was quantified. Taking a shale gas well (total depth 6530 m, horizontal section length 2130 m) as a case study, the evolution characteristics of fracture propagation volume under different pulse frequencies were simulated by integrating field fracturing parameters (displacement 11–18 m3/min, pulse frequency 0.001–0.7 Hz). The results show that there is a nonlinear correlation between pulse frequency and fracture propagation efficiency: the growth rate of fracture propagation volume is the highest at medium frequencies (0.3–0.5 Hz); excessively high frequencies (0.7 Hz) slow down the efficiency due to stress interference effects; and low frequencies (≤0.02 Hz) limit fracture extension due to insufficient stress disturbance.