提高煤岩渗透性的酸化处理室内研究  

Indoor study on acidification for enhancing the permeability of coal

作　　者：李瑞[1] 王坤[2,3,4] 王于健[1] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国科学院广州地球化学研究所,广东广州510640 [3]中国科学院矿物学与成矿学重点实验室,广东广州510640 [4]中国科学院大学地球科学学院,北京100049

出　　处：《煤炭学报》2014年第5期913-917,共5页Journal of China Coal Society

基　　金：山西省煤层气联合研究基金资助项目(2012012007);国家科技重大专项资助项目(2011ZX05034-002);国家重点基础研究发展计划(973)资助项目(2009CB219608)

摘　　要：对沁水盆地南部晋城矿区3号煤储层井下观察研究后,采集了含有方解石脉的煤岩样品,实验室条件下钻取了?25 mm的煤岩芯,利用两种不同的酸液体系对其进行了酸处理,并对酸化前后煤岩芯的渗透率、孔隙度及孔隙结构进行了测试和分析。结果显示,用盐酸对煤岩芯进行处理后,煤岩芯渗透率由原来的不足10-15m2增加到了20×10-15m2左右,孔隙度增加了4.654%,酸化主要通过改造1μm前后的孔、裂隙系统来提高煤渗透性。在此基础上,提出了对煤储层进行酸化处理在我国煤层气钻完井和增产改造中的应用前景。After the research of No. 3 coal reservoir in Jincheng area of Qinshui Basin, some coal samples were collect ed and drilled to be several Φ25 mm coal cores. Then, the coal cores are processed with two kinds of acids. The tests and analyses of permeability, porosity, and pores structure show that when the coal cores are processed with HCl acid, the permeability increases from less than 1015 mE to about 20×1015m2, and the porosity increases by 4. 654%. Acidi fication enhances the permeability of coal cores by stimulating the pores or cracks of 1μm before and after. On this ba sis ,the acidification application prospects were put forward in the drilling/completion and production stimulation of Chinese coalbed methane wells.

关 键 词：渗透率 酸化 煤岩芯 孔隙度 孔隙结构 碳酸盐矿物 

分 类 号：P618.11[天文地球—矿床学]