SAGD过程中注入烟道气和溶剂对降低稠油的表面张力作用

Performance of reducing surface tension by adding flue gas and solvent in SAGD process

采用轴对称液滴形状分析(ADSA)方法,测定烟道气-稠油、正己烷-稠油、烟道气+正己烷-稠油系统表面张力的变化规律,分析蒸汽辅助重力泄油(SAGD)过程中注入非凝析气体和溶剂后对降低稠油表面张力的能力。研究结果表明:在一定温度下,稠油的表面张力随着气体压力的增加而减小,在一定压力下,烟道气-稠油和正己烷-稠油表面张力的变化规律则相反。在相同的温度和压力下,与烟道气相比,正己烷降低稠油表面张力的作用更显著。同时,实验测得的烟道气-稠油表面张力与N2-稠油表面张力和CO2-稠油表面张力的线性插值拟合性较好。

Based on axisymmetric drop shape analysis（ADSA） technique, the surface tension of flue gas-heavy oil system, n-hexane-heavy oil system and flue gas＋n-hexane-heavy oil system were investigated to analyze the performance of reducing surface tension by adding non-condensate gas and solvent in SAGD process. The results show that at the same temperature, the surface tension of heavy oil increases as the pressure increases, but at the same pressure,the variation of flue gas–heavy oil system surface tension is contrary to the n-hexane-heavy oil system. Compared with flue gas, n-hexane reduces surface tension significantly under the same condition. Besides, the experimental data of flue gas–heavy oil surface tension agree well with the linear interpolation value which is calculated by the N2-heavy oil surface tension and CO2-heavy oil surface tension.