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Study on Mechanism of Harm to CBM Well Capability in Low Permeability Seam with Quick Drainage Method
Author(s): 
Pages: 27-31
Year: Issue:  3
Journal: Journal of Shandong University of Science and Tech

Keyword:  煤层气 渗透率 流固耦合 数值模拟;
Abstract: 我国煤层的渗透率普遍偏低,一般比美国低2~3个数量级,并且煤岩本身具有强压缩性,进而导致我国煤层普遍具有压力敏感性强的特点。山西宁武盆地煤层含气量较高,在10~20 m3/t之间,但试采结果并不理想。为了探索该问题,通过建立煤层气井流固耦合数学模型,对煤层气井的降压制度进行拟合,分析煤层气井附近储层降压漏斗的扩展情况和储层压力变换情况。结果表明,过快的排采制度使煤层气井筒附近煤储层在短时间内受到较为严重的伤害,煤层气渗透率急剧降低,阻碍煤储层降压漏斗的扩展,煤层气无法大规模解吸,因而无法形成长期稳定的单井规格产量。
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