聚合物驱多参数数值模拟自动历史拟合方法  

Automatic history matching method for multi-parameter numerical simulation of polymer flooding

作　　者：苏旭 SU Xu(Exploration and Development Research Institute,Daqing Oilfield Co.,Ltd.,PetroChina,Daqing City,Heilongjiang Province,163412,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163412

出　　处：《油气地质与采收率》2022年第5期102-110,共9页Petroleum Geology and Recovery Efficiency

基　　金：中国石油天然气股份有限公司重大科技专项“化学驱后提高采收率技术研究与试验”(2016E-0207)。

摘　　要：为了解决聚合物驱历史拟合涉及参数多、工作量大、花费时间较长等问题,从聚合物驱数值模拟基本原理出发,在多参数历史拟合影响因素研究的基础上选用应用较为广泛的ENKF方法进行聚合物驱自动历史拟合方法的探索研究,并针对聚合物驱历史拟合参数非线性特征进行改进,采用ESMDA方法研制了自动历史拟合软件,且对实际区块进行了聚合物驱历史拟合。研究结果表明聚合物驱多参数数学模型可以较好地反映油藏中聚合物驱替的基本规律,通过综合调整聚合物的吸附量、黏浓关系、残余阻力系数、不可及孔隙体积等参数,模拟结果与油藏实际动态相符,达到历史拟合的目的。所建立的自动历史拟合的数学模型满足方法要求,所研制的自动历史拟合软件可以降低模型计算结果系统误差。实际测试结果表明:全区含水趋势基本符合历史动态,累积产油量误差为3.8%,单井拟合结果较好,单井拟合符合率为81.2%,满足聚合物驱历史拟合要求。History matching of polymer flooding is exposed to problems such as the multiple parameters,heavy workload,and huge time consumption.Considering this,on the basis of the basic numerical simulation principle of polymer flooding and the research on the influencing factors in multi-parameter history matching,the widely used ENKF method was select⁃ed to explore the automatic history matching of polymer flooding.The nonlinear characteristics of the history matching pa⁃rameters for polymer flooding were improved,and the automatic history matching software was developed by the ESMDA al⁃gorithm.Moreover,the history matching of polymer flooding was performed for an actual block.The results revealed that the multi-parameter mathematical model of polymer flooding can satisfactorily reflect the basic laws of polymer flooding in oil reservoirs.Upon the comprehensive adjustment to the parameters such as the polymer adsorption capacity,viscosity-con⁃centration relationship,residual resistance coefficient,and inaccessible pore volume,the simulations are consistent with the actual performance of the reservoirs.In this way,the purpose of history matching is achieved.The constructed mathematical model for automatic history matching meets the algorithm requirements,and the developed automatic history matching soft⁃ware can reduce the systematic error of model calculations.The actual test results indicate that the water cut trend of the whole region basically conforms to the historical performance,and the cumulative oil production error of the whole region is 3.8%;the single well matching result is good,with a single well matching coincidence rate of 81.2%,which meet the re⁃quirement of history matching of polymer flooding.

关 键 词：聚合物驱 聚合物驱特征参数 ESMDA算法 集合卡尔曼滤波 数据同化 自动历史拟合 

分 类 号：TE319[石油与天然气工程—油气田开发工程]