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OALib Journal期刊
ISSN: 2333-9721
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考虑应力敏感性的页岩气产能预测模型
Keywords: 页岩气,解吸,产能预测,数学模型,应力敏感性
Abstract:
？根据页岩气储层中气体的成藏机制及流动机理，综合考虑了解吸—吸附作用和应力敏感性对页岩气藏产能的影响，建立了考虑解吸、扩散及渗流综合作用的页岩气稳态流动模型，在不同边界条件下对控制方程进行求解，得到页岩气储层的压力分布及产能方程，分析了不同解吸量对地层压力和产量的影响，解吸量越大，地层压力下降越慢，产量和压力平方差呈线性关系。在此基础上建立了考虑应力敏感性的产能方程，分析结果表明随着渗透率变异系数的增大，储层的应力敏感性越强，产量逐渐减小,要合理控制压差，以防对储层造成损害。此模型对页岩气生产和后续研究具有重要指导意义。
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