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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。
By using the theories and methods of CBM geology, advanced coal chemistry, coal petrology and geology of oil and gas exploration, a new principle of coal reservoir reformation is discussed. From the perspective of conventional reservoir acidification, a simulation experiment of coal-rock carbon dioxide and acid-to-soil acidification was designed and carried out, and the conventional permeability test was carried out. The experimental results show that permeability of coal and rock can be improved to some extent after being acidified. The samples were analyzed by mercury intrusion, X-ray diffraction and scanning electron microscopy. It was found that the acidified coal and rock mineral components had different degrees of dissolution, and pore structure, seepage channel and permeability were all improved to some extent. However, The reformation effect mainly depends on the basic pore-permeability characteristics, mineral composition and content of raw coal reservoirs and the time control of drainage after acidizing.