关键词: 聚丙烯酰胺, 反相乳液, 调驱, 注入参数, 敏感性分析, 数值模拟, 数学模型

Abstract: The combination mechanism of in-depth profile control and flooding of polyacrylamide(PAM) inverse emulsion was studied.Considering the adsorption of chemical species on rock surfaces,permeability reduction caused by the adsorption of polymer and gel,as well as inaccessible pore volume to macromolecules,a mathematical model applicable to description of the flooding process of PAM inverse emulsion was established.The corresponding numerical simulator was developed.Taking Ng^3-4 strata of Zhongernan Block in Gudao Oilfield as an example,the sensitivity of injection parameters was analyzed.It is found that the effects for combination of profile control and flooding are improved with the increases of injection concentration of PAM inversion emulsion,injection volume of PAM inversion emulsion and the injection volume of displacement fluid,in the view of enhanced oil recovery aspect alone.However,when other factors,such as cost,and incremental oil production,are considered,there exist the corresponding optimum values for these factors,respectively.Taking the cost,incremental oil production,and decremented water cut into account,the field injection scheme was optimized with the orthogonal array method and the fuzzy mathematical theory.The average daily liquid production rate increased by 21.3%,but the average daily oil production rate increased by 37%,and the water cut decreased by 1.1%.

Key words: polyacrylamide, inverse emulsion, combination of profile control and flooding, injection parameter, sensitivity analysis, numerical simulation, mathematical model