特种油气藏2018，Vol.25Issue(2)：125-129,5.DOI:10.3969/j.issn.1006-6535.2018.02.025
致密砂岩储层渗吸稳定时间影响因素研究
Sensitivity Analysis of Imbibition Stability Time in Tight Sandstone Reservoir
摘要
Abstract
The spontaneous imbibition experiment of the tight sandstone reservoir samples in Yanchang Formation of Changqing Oilfield is carried out to optimize the well-killing time. A statistic of imbibition stability times under dif-ferent properties is provided to analyze the effects of permeability,salinity,simulated oil viscosity,interfacial ten-sion and other factors on imbibition stability time. Research shows a V-shape relation between imbibition stability time and sample permeability. The imbibition stability time decreases with the increase of permeability when the permeability is less than 0.2×10-3μm2. The steady imbibition has not been reaches due to the influence of pore-throat structure when the permeability exceeds 0.2×10-3μm2. Due to the effect of salinity different,the imbibition stability time increases with the increase of substitution fluid salinity.The imbibition stability time increases with the increase of simulated oil viscosity. The imbibition stability time decreases with the decrease of interfacial tension be-tween the substitution fluid and simulated oi. The influencing factors from high to low level are permeability,inter-facial tension,oil viscosity and salinity. This research could provide certain guidance for the imbibition experiment analysis and well-killing production after volumetric fracturing in tight sandstone oil reservoir.关键词
致密砂岩/渗吸稳定时间/渗透率/矿化度/模拟油黏度/界面张力Key words
tight sandstone/imbibition stability/permeability/salinity/simulated oil viscosity/interfacial tension分类
能源科技引用本文复制引用
周德胜,李鸣,师煜涵,邹易,刘顺..致密砂岩储层渗吸稳定时间影响因素研究[J].特种油气藏,2018,25(2):125-129,5.基金项目
国家科技重大专项"低渗透致密砂岩气藏压裂裂缝及参数优化"(2016ZX05050-009) （2016ZX05050-009）
中国石油科技创新基金"致密砂岩储层压裂液渗吸增产主控因素探究"(2016D-5007-0207) （2016D-5007-0207）
