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OALib Journal期刊
ISSN: 2333-9721
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致密多孔介质气体运移机理
Keywords: knudsen数,渗透率修正因子,enskog稠密气体理论,滑脱效应
Abstract:
？气体在致密多孔介质中的运移受多种因素的影响，如孔隙结构、气体的赋存方式、温度和压力等。地层压力大，气体密度高，应属于稠密气体|另外，在页岩、煤岩、致密砂岩等多孔介质中发育了丰富的纳米级孔隙，使气体的运移机制极为复杂。详细研究了气体在致密多孔介质中的运移机理，并引入稠密气体理论，通过计算分子平均自由程，发现直径大于2nm的孔隙中，压力大于1.135mpa时(76.85℃)，气体不会发生knudsen型扩散，fick型扩散和表面扩散可能是主要的扩散方式|并得到knudsen渗透率修正因子随压力增加而减小,随温度的升高而增加,随孔隙半径的减小而增加，在较小孔隙中温度的影响更显著;气体从小孔扩散至大孔和裂缝系统是多种扩散机制的结果，孔隙的大小、气体的赋存方式和压力直接关系到气体的运移机理。对比分析klinkenberg渗透率和knudsen渗透率修正因子，发现knudsen渗透率模型是更精确的渗透率模型，klinkenberg渗透率修正因子可以看作是knudsen渗透率修正因子的一级修正。
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