董广为;

• 1:中国石化石油勘探开发研究院

摘要(Abstract)：

对于低渗气藏,采用分段压裂水平井技术可以达到经济效益最大化。基于点源函数法和能量守恒方程,建立非稳态气藏渗流与井筒压降耦合模型,刻画气藏介质—裂缝—井筒的流动特征,采用非线性迭代法求解耦合系统,融入平均压缩因数迭代法修正结果。对于某气藏,应用耦合模型设计最优压裂方案,优化单裂缝参数,以单裂缝最优几何形态为基础,优化双裂缝和多裂缝设计方案,包括裂缝位置、条数等。结果表明:相同体积、不同几何形态裂缝的产量差别很大,垂向—水平渗透率比越大,越应减小裂缝的垂向尺寸;固定裂缝几何形态,裂缝位于气藏中部时产量最高;流动早期,裂缝数量的增加使流量提高,随开采进行裂缝数量增加优势逐渐不明显;结合压裂成本、油价等因素,确定多裂缝系统最优裂缝数为3条。耦合模型与数值模拟结果误差在15%以内,验证模型的可靠性,系统化裂缝设计方法为低渗气藏压裂水平井提供指导。

关键词(KeyWords)：低渗气藏;非稳态渗流;点源函数;井筒压降;耦合模型;裂缝设计

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2016ZX05033-003);; 国家青年科学基金项目(41702359)

作者(Author):董广为;

Email:

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