CO_2驱水气交替注入参数正交试验设计模拟

Optimization of water alternating gas injection parameters of CO_2 flooding based on orthogonal experimental design

结合ECLIPSE软件的PVTi和E300模块,建立了榆树林特低渗透油藏三维三相油藏数值模拟模型。在历史拟合基础上,根据正交试验设计原理,考虑水气交替注气量、段塞大小、气水比、注气速度和后续水驱注入速度5个参数,以增油量和换油率为评价指标,进行正交试验设计。通过对试验结果的直观和方差分析,得到注入参数对评价指标影响的主次顺序,优选出水气交替注入参数的最佳组合方案,为现场CO2驱水气交替注入参数的优化提供理论指导和技术支持。

A three-dimensional three-phase numerical simulation model has been established for the Yushulin extra-low permeability reservoir by combining the PVTi and E300 modular of the ECLIPSE software.Based on history match and the principle of orthogonal experimental design,the orthogonal experiment has been carried out with oil increment and oil drainage rate as evaluation criteria as well as considering five factors such as WAG injection volume,slug size,gas-water ratio,CO2 injection rate and subsequent water flooding injection rate.According to visual analysis and variance analysis,the importance order of the influence of injection parameters on evaluation criteria has been obtained;meanwhile the best combination of WAG injection parameters has been optimized,thus providing theoretical instruction and technical support for optimization of WAG injection parameters of CO2 flooding.