摘要
运用煤层气地质学、高等煤化学、煤岩学以及油气开发地质学的理论与方法,探讨了煤储层改造的新原理。从常规储层酸化改造的角度,设计并开展了煤岩二氧化碳、土酸酸化改造模拟实验,并配以常规渗透率测试。实验结果显示,煤岩经过酸化后,渗透率得到不同程度的改善。结合压汞实验、X-衍射实验、扫描电镜实验对样品进行分析,发现经过酸化的煤岩矿物组分得到了不同程度的溶蚀,孔隙结构、渗流通道和渗透性均得到不同程度的改善,但其改造效果主要决定于原煤储层的基础孔渗特征、矿物组成及含量和酸化改造后排液的时间控制。
Synthetically application of CBM geology, higher coal chemistry, coal petrology and petroleum engineering,new principle of coal reservoir stimulation was discussed. From the perspective of conventional reservoir acidification reconstruction,an experiment of acidization alteration of CO2 and mud acid was designed and made. Based on the results of conventional permeability, mercury injection,X-ray diffraction and SEM, the effect of acid treatment for the alteration of reservoirs was positive and productive. The minerals that coal reservoir contained were dissolved. The pore structures, seepage channels and the permeability of the coal samples after acidification were improved obviously. The main factors influencing the acidification of coal samples were the basic characteristics of porosity and permeability of coal samples before treated such as the minerals component and content,and the control of drainage after acidization alteration.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第5期761-766,共6页
Natural Gas Geoscience
基金
国家科技重大专项"大型油气田及煤层气开发"(编号:2011ZX05033-003)资助
关键词
煤
储层
孔隙
渗透性
酸化
控制因素
Coalbed
Reservoir
Porosity
Permeability
Acidization alteration
Control factors
