
为了优化压裂液清理过程,建立裂缝单井模型,分析裂缝长度、储层渗透率、毛细管力等参数对压裂液清理效率的瞬时影响。共进行了35组不同参数条件下的模拟分析,探讨裂缝渗透率、闭井时间、压降等因素对天然气损失的影响。模拟结果表明,裂缝渗透率是影响压裂液清理效率的最重要因素,裂缝渗透率的增加可显著降低天然气损失。在裂缝渗透率较高的情况下,天然气流动更加顺畅,压裂液清理效率提高。裂缝长度对天然气损失的影响较为复杂,短裂缝的清理效率高于长裂缝。研究还发现,延长闭井时间(最多20天)有助于提高清理效率,特别是在生产初期阶段,能够提高毛细管力对天然气损失的影响,增强清理效果。在低渗透层位,增大基质渗透率和提高裂缝内流体流动性可显著提升清理效率,减少天然气损失。生产压降的减小有助于进一步提高清理效率。
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