胜利油区整装油田河流相开发单元开发潜力及对策

Development potential and strategy of fluvial sedimentary units in integrated oilfield of Shengli oilfield

胜利油区整装油田河流相开发单元分布在胜坨、孤岛、孤东和埕东4个油田,经过几十年的开发,目前已进入特高含水开发阶段,油田稳产难度越来越大,因此需要对油田的开发潜力进行分析,并提出相应的开发对策来保持油田稳产。根据胜利油区整装油田河流相开发单元特征,提出了综合流动系数的概念并依此进行分类;通过建立的分类标准,将河流相开发单元分为3类。采用河流相开发单元的相对渗透率曲线和经验公式,计算了不同类别单元的驱油效率、波及系数和采收率,并与水驱曲线法标定的采收率进行了对比,得到了不同单元的开发潜力。以Ⅰ类单元为例,选取交错行列和正对行列2种井网形式的典型单元,建立了油藏地质模型,在历史拟合的基础上,通过对不同开发措施的优化分析,提出了以井网整体加密和水平井挖潜为主的提高水驱采收率的开发对策。

Based on understanding of the characteristics of fluvial sedimentary units in integrated oilfield in Shengli oilfield,the concept of an integrated flow coefficient is put forward.Based on the classification criteria established,the fluvial sedimentary units are divided into three types.Using the predicted model of displacement efficient which is obtained from the relative permeability curves of integrated oilfield,and using the empirical formula,the displacement efficient and sweep coefficient of different units are obtained.Compared with the oil recovery which is obtained from the flooding curves,the development potential of different types units is obtained.The reservoir simulation models are established based on the actual units,Based on the production history matching,the development performance of different approaches is predicted by using the reservoir simulation technique.And,the optimal approach to improve the oil recovery is proposed.The research result has important significance for the development of integrated oilfield in Shengli oilfield.