毛港涛,赖枫鹏,木卡旦斯·阿克木江,蒋志宇
Mao Gang-tao,Lai Feng-peng,Mukatts Akrumyan,Jiang Zhi-yu
摘要: 在煤层气开采过程中,水锁伤害是煤层损害的一种主要因素,因此研究煤层气储层水锁损害及影响因素有利于作出具有针对性的应对措施来减轻水锁伤害的影响,达到提高煤层气采收率、提升经济效益的目的。以沁水盆地赵庄井田14块煤样为研究对象,首先通过低温液氮吸附对煤样的孔隙结构进行了研究,认为该区块孔隙结构复杂,孔径较小,孔隙体积分布在0.007 9~0.033 7cm3/g之间,平均为0.019 45cm3/g;孔容较小,且以微孔和过渡孔孔容为主,孔隙形态不利于煤层气的渗流。其次通过核磁共振和离心机实验,基于T2截止值法判断了区块的潜在水锁伤害程度,结果表明该区块平均束缚水饱和度达到0.822 1,说明潜在水锁伤害严重。最后分析了煤样孔隙结构,润湿性以及地层压力对赵庄区块水锁伤害的影响。
中图分类号:
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