岩性油气藏 ›› 2022, Vol. 34 ›› Issue (6): 152159.doi: 10.12108/yxyqc.20220613
• 石油工程与油气田开发 • 上一篇
卢迎波
LU Yingbo
摘要: 为探索泡沫油在超稠油油藏中的形成机理、渗流特征及驱油效果,采用准噶尔盆地西北缘乌夏断裂带侏罗系齐古组原油及油藏参数,进行注气形成泡沫油介质筛选及原油泡点压力测定实验,并开展注气微观可视化和填砂管驱油实验,深入解析注气形成泡沫油过程中的渗流特征,评价了注气泡沫油驱油效果。研究结果表明:①准噶尔盆地西北缘乌夏断裂带侏罗系齐古组原油泡点压力为9.7 MPa,拟泡点压力随着注气量的增加而增加,随温度的上升而上升,50℃的拟泡点压力随着CO2注入量的增加而增大,压力上升速度较缓,储层具有较好的注气特性。②研究区的泡沫油渗流可分为5个阶段:无气泡阶段、气泡析出阶段、气泡扩张阶段、气泡聚并阶段和气泡消亡阶段。③研究区蒸汽+CO2方式驱油开采过程较纯蒸汽填砂管驱的采收率可提升13.3%,开采过程中随着压力的释放,气泡数目逐渐增多,产油量逐步缓慢上升;当压力降至泡点压力后,气泡数目趋于平稳,形成较稳定的泡沫油,产油量大幅提升,为主力产油期;当压力释放至拟泡点压力后,气泡数目迅速下降,泡沫油逐渐消亡,产油量缓慢下降。
中图分类号:
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