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OALib Journal期刊
ISSN: 2333-9721
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川南地区龙马溪组页岩润湿性分析及影响讨论
Keywords: 龙马溪组页岩,润湿性,油湿,水湿,吸附特性,水锁,井壁稳定
Abstract:
？国内外大部分学者研究认为泥页岩表面润湿性为水湿，而页岩气藏中页岩岩石存在有机质影响，页岩表面润湿性表现比较复杂，因此选择四川盆地龙马溪组野外露头及井下岩心进行分析，通过开展一系列实验，研究分析了龙马溪组页岩润湿性，并从3个方面初步探索讨论了润湿性对页岩气藏的影响。研究结果表明龙马溪组页岩表面既亲油又亲水，且页岩表面更倾向于油湿，页岩岩石孔隙表面处润湿性存在差异，出现非均匀润湿性即斑状润湿|页岩自吸吸水率、吸油率随时间增加而先上升后趋于稳定，页岩自吸吸水率大于自吸吸油率|页岩浸泡在水中水化应力随着时间增加而先呈上升后趋于稳定，而先浸泡白油后浸泡水中水化应力上升速度减慢|页岩硬度随浸泡时间增加、浸泡温度升高以及浸泡压力增大而呈下降趋势，其中浸泡白油中硬度下降幅度较小，而浸泡水中硬度下降幅度较大|页岩表面吸附特性与表面自由能有关，表面自由能随水接触角减小而增大，同时页岩表面亲油对气态烃有较强吸附能力|页岩表面亲水性易造成水锁，而表面亲油性可减轻水锁伤害，页岩气藏水锁伤害评价应考虑页岩表面既亲油又亲水特性影响|油基钻井液对页岩强度影响较小，而水基钻井液对页岩强度影响较大，易造成井壁失稳，水基钻井液体系优化需考虑抑制其水化作用。
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