考虑相渗时变的数值模拟历史拟合方法及应用  

Numerical simulation historical matching method and its application considering the relative permeability time-dependent

作　　者：李威 李伟 闫正和 谷悦 张琴 LI Wei;LI Wei;YAN Zhenghe;GU Yue;ZHANG Qin(Shenzhen Branch of CNOOC Ltd.,Shenzhen,Guangdong,518000,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000

出　　处：《天然气与石油》2021年第1期67-73,共7页Natural Gas and Oil

基　　金：中海石油(中国)有限公司深圳分公司“南海东部在生产油田挖潜技术研究”(YXKY-ZL-SZ-2016-04)。

摘　　要：海相砂岩油田长期水驱冲刷下存在残余油饱和度变化,制约着油藏数值模拟历史拟合及对剩余油认识的准确性,有必要开展相渗端点时变表征及时变模拟方法研究与应用。利用物理模拟及过路井饱和度标定,定量表征长期水驱残余油饱和度端点变化规律,建立水驱倍数下相渗曲线系列;改进传统数值模拟软件,增加相渗分区随过水倍数调用函数,嵌入历史全过程迭代,实现相渗时变模拟及历史拟合。南海X油田应用表明,长期水驱残余油饱和度与驱替倍数呈对数关系,该方法将过路井沿程含油饱和度及高含水期生产动态的拟合精度大幅提高,剩余油分化"马太效应"明显,指导调整井挖潜效果较好且与模型吻合度高,为油田开发后期潜力研究及提高采收率提供了较好的技术借鉴。Residual oil saturation variation exists in marine sandstone oil fields under long-term water flooding,which limits the accuracy of reservoir numerical simulation historical matching and residual oil recognition.So,it is necessary to carry out research and application of the relative permeability timedependent characterization and simulation method.Physical simulation and saturation benchmarking of crossing wells are used to quantitatively characterize the residual oil saturation endpoint in long-term water flooding and establish a series of time-dependent relative permeability group.By improving traditional numerical simulation software,the calling function of water-drive multiples field is increased and embedded into history full-process iterative algorithm,and finally realize the historical matching considering the relative permeability time-dependent.The application in Nanhai X oilfield shows that the residual oil saturation has a logarithmic relationship with water-drive multiples in long-term water flooding.The accuracy of saturation along crossing well and production dynamics matching is considerably improved with time-dependent simulation.The‘Matthew Effect’of remaining oil distribution is obvious.Guided by the study,the adjustment wells have better potential tapping performance and well fit the model,which provides technical reference for the study and oil recovery enhancement at late development stage.

关 键 词：相渗端点时变 残余油饱和度 过路井标定 全过程迭代 历史拟合 

分 类 号：TE53[石油与天然气工程—油气田开发工程]