应用水平井动用储层顶部剩余油物理模拟

Physical model of producing remaining oil from top reservoir by horizontal well

通过实际动静态资料及相似理论,建立了大型三维物理模型。应用所建立的模型,研究了高含水期正韵律储层剩余油分布规律,并针对应用水平井挖潜储层顶部剩余油的机理及效果进行了分析,最终总结出应用水平井提高顶部剩余油动用程度的有效模式。研究表明:具有正韵律特征的储层开发至高含水期,剩余油多富集于顶部及油井井间;应用水平井进行挖潜顶部剩余油,相对于直井,其在提高采收率、累计产油及产油速度等方面均表现出了较大的优势,且可有效改善顶部油水分布状况;不同的水平井部署方式会对顶部挖潜效果产生差异,当水平井垂直于注入井连线时顶部动用最为充分。

A large scale 3D physical model has been built based on dynamic and static data as well as the theory of similarity.The model is used to study the distribution trend of remaining oil in positive rhythm reservoirs at high water cut stage,to analyze the mechanism and effect of producing remaining oil from the top of a reservoir by using horizontal well,thereby generalized an effective mode of tapping remaining oil in top reservoir with horizontal well.The result shows that when a reservoir with positive rhythm has entered high water cut stage in its development process,remaining oil usually concentrates in the top and between oil wells;compared to vertical well,horizontal well is more superior in tapping top reservoir in respects of improving recovery,cumulative oil production,production rate,and can effectively improve oil and water distribution in the top;different placements of wells may have different effects on potential tapping;and the top reservoir is produced most efficiently when horizontal well is perpendicular to injection row.