复杂断块低渗弱边水油藏剩余油描述方法探讨  

Discussion on Remaining Oil Description Method for Complex Fault Block Reservoir With Weak Edge Water and Low Permeability

作　　者：张骞 马帅 唐慧敏 何志辉 王一 ZHANG Qian;MA Shuai;TANG Hui-min;HE Zhi-hui;WANG Yi(Zhanjiang Branch of CNOOC(China)Company Limited,Guangdong Zhanjiang 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司

出　　处：《辽宁化工》2019年第12期1249-1251,共3页Liaoning Chemical Industry

摘　　要：复杂断块中低渗弱边水油藏通常采用边部注水开发,常觃数值模拟斱法描述剩余油结果往往与强边水油藏开发描述结果相近,预测生产指标远远好于油藏实际生产情况。本文以A油田为例,分析认为油藏模型与相渗曲线不匹配,是导致常觃数值模拟斱法预测指标偏高的主要原因,在此基础上优化提出改进的数值模拟新斱法。新斱法采用非平衡建模斱法匹配相渗曲线,建立油藏模型更符合储层实际情况,有效降低了纯水流动区注入水绕流驱替,历史拟合过程中参数修改更合理,拟合效果更好,预测生产指标与实际更接近,剩余油描述结果更准确。基于改进斱法的剩余油描述结果,指导油田调整挖潜,在构造中高部位实施调整井,实施效果好,有效提高了油藏采收率,进一步证明了新斱法的可靠性。Low permeability and complex fault block reservoirs with weak edge water usually use edge water injection development mode.The remaining oil describing result of conventional numerical simulation is similar to the strong edge water drive reservoirs.At the end of development,only a small amount of remaining oil exists in the high position of the structure,the prediction index is much better than the actual condition.In this paper,taking A oil field as an example,an improved numerical simulation method was proposed.The new model using nonequilibrium-modeling to assign relative permeability curve is close to the actual condition,and unreasonable problems of injected water flooding along the pure water area preferentially is amended.Based on the improved numerical simulation method,the parameter modification is more reasonable at history matching,the history matching effect is better,the predictive index and remaining oil description is more reliable.In view of the results,an adjustment well have been implemented,the oil recovery has been effectively enhanced,which proves the reliability of the method.

关 键 词：残余油饱和度 相渗曲线 非平衡建模 改进的描述斱法 

分 类 号：TE347[石油与天然气工程—油气田开发工程]