中国石油大学学报（自然科学版）2023，Vol.47Issue(6)：80-86,7.DOI:10.3969/j.issn.1673-5005.2023.06.009
析蜡不可逆性对低渗高凝油流动性及水驱效果的影响
Effect of wax precipitation irreversibility on flowability and water flooding for high pour point crude oil in low permeability reservoir
摘要
Abstract
Wax precipitation of high pour point oil is irreversible,which has significant effect on development of water injec-tion and other enhanced methods.Under cooling and heating procedures,the wax precipitation-wax dissolution behavior,vis-cosity,rheological property,oil phase seepage ability and water flooding efficiency of high pour point oil were systematically compared.The results show that the wax dissolution temperature of a high pour point oil is 71.5℃,which is significantly higher than the wax precipitation point of 62.3 ℃,and there is irreversibility.When the temperature is higher than the wax dissolution point,the crude oil viscosity values in the cooling and heating modes are basically the same,and the water flood-ing recoveries are equivalent.When the temperature of the crude oil is between the wax dissolution point and the wax precipi-tation point,the wax does not precipitate during the cooling process,and the viscosity is relatively small,showing Newtonian fluid performance and having no seepage starting pressure,and higher water flooding recovery(more than 60%).In the heating mode,the wax crystal is not completely dissolved,the viscosity is high,and it is a non-Newtonian fluid.There is a starting pressure,and water flooding recovery is significantly reduced(less than 50%),indicating the obvious irreversible effect.Considering cold damage of high pour point oil reservoir,its temperature is not enough to be slightly increased by hot water injection,and it should reach above the wax melting point,otherwise the water flooding efficiency will be significantly worse.关键词
高凝油/温度/析蜡不可逆性/流动性/水驱采收率Key words
high pour point oil/temperature/wax precipitation irreversibility/flowability/water flooding recovery分类
能源科技引用本文复制引用
王业飞,吴寒超,丁名臣,陈五花,司永昌,李强..析蜡不可逆性对低渗高凝油流动性及水驱效果的影响[J].中国石油大学学报（自然科学版）,2023,47(6):80-86,7.基金项目
国家重点研发计划政府间国际科技创新合作重点专项(2021YFE0107000) （2021YFE0107000）
国家自然科学基金面上项目(52074339) （52074339）
山东省自然科学基金面上项目(ZR201911080151) （ZR201911080151）
