砾岩油藏二元复合驱油体系各组分吸附规律

Absorption of Each Chemical Component during the Process of Surfactant/Polymer Flooding in Conglomerate Reservoir

吕建荣 陈丽华 霍 进 许长福 谭锋奇 程宏杰 张德富

Lü Jianrong CHEN Lihua HUO Jin XU Changfu TAN Fengqi CHENG Hongjie ZHANG Defu

为揭示二元复合驱体系各组分在非均质性强、 孔隙结构呈复模态的砾岩油藏中的吸附损失， 研究了石油磺酸盐（KPS） /部分水解聚丙烯酰胺（HPAM）二元体系在克拉玛依油藏砾岩岩心表面的静态吸附和动态滞留规律。结果表明， HPAM和 KPS在单矿物和砾岩岩心表面的静态吸附量均随初始浓度的增加而增加并逐渐稳定；KPS 在各单矿物表面的吸附量大于 HPAM； 由于物质组成和表面结构的差异， 黏土矿物的吸附量高于骨架矿物。二元复合驱油体系（0.3% KPS+0.18% HPAM）各组分的静态吸附量与矿物活性中心的作用力强弱成正比。由于存在竞争吸附关系， 二元复合驱溶液中 HPAM与 KPS在砾岩岩心表面的静态吸附量均小于单一组分的吸附量。HPAM与 KPS在砾岩岩心表面的静态吸附量小于黏土矿物、 大于骨架矿物， 主要的吸附作用发生在黏土矿物表面。二元复合驱油体系中 HPAM与 KPS的动态滞留量与砾岩岩心渗透率呈负相关关系； 受岩心比表面积及水对化学剂稀释解吸的影响， 二元复合驱油体系中 KPS的动态滞留量低于静态吸附量； 受岩心孔隙结构及比表面积的影响， HPAM的动态滞留量小于静态吸附量。图6表 1参17

In order to reveal the adsorption and lost amount of each component in surfactant/polymer（SP）flooding system for conglomerate reservoir with strong heterogeneity and complex model pore structure， the static adsorption and dynamic retention laws of petroleum sulfonate（KPS）and polyacrylamide（HPAM）on the surface of conglomerate core in Karamay reservoir were studied. The results showed that the static adsorption amount of HPAM and KPS on the surface of single mineral and conglomerate core increased with increasing initial concentration and then kept unchanged. The adsorption amount of KPS on each single mineral was more than that of HPAM. Because of the difference of material composition and surface structure， the adsorption amount of clay mineral was more than that of rock skeleton mineral. The static adsorption amount of each component in SP flooding system（0.3% KPS+0.18% HPAM）was proportional to the strength of mineral active center. Because of the competitive adsorption effect， the static adsorption amount of HPAM and KPS in SP flooding system on conglomerate core surface was less than that of single chemical component. The static adsorption amount of HPAM and KPS on conglomerate core surface was less than that of clay mineral but more than that of skeleton mineral. The main absorption effect occurred on the surface of clay mineral. The dynamic retention amount of HPAM and KPS in SP flooding system was negative correlation with the permeability of conglomerate core. Because of the influence of core specific surface area and the dilution of water to chemical agent， the dynamic retention amount of KPS in SP flooding system was lower than its static absorption amount. The dynamic retention amount of HPAM was less than static absorption amount due to the effect of pore structure and specific surface area.