裂缝性潜山油藏空气驱见效特征分析

摘要

针对裂缝性潜山油藏在中高含水开发期,基质原油动用程度低、控制含水上升与稳定地层压力存在矛盾的问题,在沈625潜山及静北潜山实施了空气驱,并对气驱见效特征进行了分析结果认为,注气见效体现在油井含水率持续下降;注气见效与注水见效时注采对应关系基本一致;纵向上不同部位注气均有油井见效,但无法确定注气部位的优劣.影响注气效果的因素主要包括注采对应关系、含油饱和度以及地层压力保持水平等.该研究为同类油藏空气驱提供了借鉴%The development of fractured buried-hill oil reservoir in high water-cut stage is featured by low producing-level of matrix oil and significant contradiction between water-cut controlling and formation pressure maintaining.Air-flooding is respectively implemented in Shen625 and Jingbei buried-hill oil reservoirs and the corresponding air-flooding response is analyzed.Research demonstrates that the response of air injection is characterized by the decline of water-cut in oil well.There is a consistent injection-production relationship for the responses of air-flooding and water-flooding.The optimal air injection interval cannot be determined though any air injection interval along the longitudinal direction could lead to response in oil well.The air-flooding performance is dependent on injection-production relationship,oil saturation and formation pressure level.This research could provide a reference for the air-flooding of similar oil reservoirs.