一种致密多孔介质的克氏渗透率测试校正方法——以煤岩为例A Compact Porous Media Klinkenberg Permeability Test Modification Method:A Case Study of Coal-Rock
邓鹏,林亮,鄂广杏,朱苏阳,彭小龙,杨宇光
摘要(Abstract):
随着页岩气藏和煤层气藏的深入开发,研究普遍关注气体实验室条件下在岩心微纳流道中的滑脱效应。煤岩的渗透率一般在气测渗透率后,利用Klinkenberg提出的校正方法得到煤岩的克氏渗透率。滑脱效应的校正采用延长低压实验测试段的拟合线,得到克氏渗透率的方法。通过分析煤岩在实验过程中不同回压条件下的流动阶段,研究发现在滑脱流动拟合线延长过程中,流动从滑移流动变化为连续流动的过程中,气测渗透率并不符合滑移流动延长线的变化趋势。研究通过实验以及文献中的数据验证了提出了渗透率校正方法。通过回压校正方法,得到的煤岩的渗透率较常规滑脱校正方法得到的渗透率大,两者的差距在中等渗透率岩心上并不明显,渗透率越小,两者差距越大。
关键词(KeyWords): 滑脱效应;克氏校正;回压校正;煤岩;流动阶段
基金项目(Foundation): “十三五”国家科技重大专项课题(编号:2016ZX05066004-001)
作者(Author): 邓鹏,林亮,鄂广杏,朱苏阳,彭小龙,杨宇光
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