天然气地球科学 ›› 2021, Vol. 32 ›› Issue (1): 98108.doi: 10.11764/j.issn.1672-1926.2020.11.008
Shu-sheng GAO(),Hua-xun LIU(),Li-you YE,Wei-guo AN,Wen-qing ZHU
摘要:
为揭示页岩和致密砂岩气开发方式差异性的原因,运用页岩与致密砂岩全直径岩心模拟气井全生命周期开发动态,研究2种气藏产气机理。实验结果表明:页岩气生产过程包括高速、中速和低速开发3个阶段,只有中速开发阶段地层视压力与累计产气量呈线性关系,压力降到12 MPa时偏离原有的线性关系;而致密砂岩地层视压力与累计产气量基本呈线性关系,只在压力接近于0.1 MPa时偏离原有的线性关系。致密砂岩高速开采阶段采出程度达90%,低速开发采出程度低;而页岩高速开采阶段采出程度只有17%,中低速开发阶段采出程度可以达到50%,二者低速开发阶段单位压降采气量大幅增加,证明都含有一定量的吸附气,差别在于页岩解吸压力和吸附气量占总气量比例相对较高。最后,根据页岩渗透率和吸附气的认识,建立考虑滑移效应与Langmiur吸附效应的相对简单的页岩全生命周期渗流模型,数值模拟页岩全直径岩心全生命周期生产动态,视压力曲线、日产气递减曲线与实验结果具有很好的一致性,拟合游离气量和吸附气量相对误差不足5%,证明该模型预测页岩气井产能的可行性。
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