基于数值试井的聚驱前缘与大通道识别应用案例分析利用产气剖面精细描述多层气藏动态特征  

Case study for identification of polymer flooding front and large channel based on numerical well testing

作　　者：董晓芳 DONG Xiaofang(Well Logging Services Branch Company of Daqing Oilfield Company Ltd.,PetroChina,Daqing,Heilongjiang 163453,China)

机构地区：[1]中国石油大庆油田有限责任公司测试技术服务分公司,黑龙江大庆163453

出　　处：《油气井测试》2018年第3期66-71,共6页Well Testing

基　　金：国家重大科技专项"致密油气藏多尺度介质复杂结构井数值试井分析方法及应用研究"(2017ZX05009005-002)

摘　　要：地层压力、聚合物波及范围及前缘变化监测是聚合物驱提高采收率中亟待解决的难题。根据地层流体渗流特点,考虑聚合物黏度、吸附、剪切变稀等多种物化现象,建立油水两相四组分聚合物驱流动模型,基于非结构PEBI网格进行全隐式数值求解,形成聚合物驱数值试井方法,并研制聚驱数值试井解释软件。以A1井和B1井为例,应用压力恢复测试的数值试井解释结果,考察了聚合物驱的波及范围及聚驱前缘推进情况,识别了注采井组之间优势通道发育状况。该方法在大庆油田聚合物驱开发区块应用200多井次,取得较好的效果。应用实例表明,聚驱数值试井解释软件能正确反映地层压力及流体渗流情况,准确判断聚合物波及范围及前缘推进、地层大孔道分布、井间连通状况,可以为化学驱提高采收率的生产制度优化和措施调整提供依据。The formation pressure,the sweep range of the polymer and the monitoring of the change of the leading edge are the problems to be urgently solved in the polymer flooding.According to the percolation characteristics of formation fluids,as well as the multiple physical and chemical phenomena such as polymer viscosity,adsorption and shear thinning,the flow model of oil-water two-phase four-component polymer flooding was established.The model is based on a non-structural PEBI grid for full implicit numerical solution,so that a set of numerical test methods for polymer flooding is established.Meanwhile,the corresponding numerical testing interpretation software is also developed.In order to verify their effectiveness,this paper takes Wells A1 and B1 as examples,applies the numerical well test interpretation results of the pressure recovery test to examine the sweep range of the polymer flooding,the position of front edge,and the development status of dominant channels between injection-production wells,it is found that the effectiveness is great.The method was applied in more than 200 wells in the polymer flooding block in Daqing Oilfield and achieved satisfactory results.These actual examples show that the polymer flooding numerical testing interpretation software can accurately reflect formation pressure and fluid percolation conditions,meanwhile,it can also determine the spread of the polymer,the position of the front edge,the distribution of large pore throat,and the connectivity of wells,so as to provide the basis for optimization and adjustment of production system for improving enhanced oil recovery.

关 键 词：聚合物驱 试井 数值试井 前缘 曲线拟合 优势渗流通道 

分 类 号：TE353[石油与天然气工程—油气田开发工程]