文明寨油田驱油用表活剂色谱分离现象

Chromatographic Separation of Surfactant for Oil Displacement in Wenming Village Oilfield

摘要: 当复合体系流经油层时，各驱油组分因运移速度不同而容易出现色谱分离效应，破坏表活剂复合驱的协同效应，影响驱油效果，针对文明寨油田实施的聚合物 + 表活剂复合驱开展了色谱分离效应研究，并首次应用无因次分离系数作为评价色谱分离程度的参数。研究表明，随渗流距离的增加，无因次分离系数越大，说明色谱分离现象变大，结合文明寨油田油藏概况，综合考虑地层的吸水强度、孔喉大小及波及程度等，计算得出该油藏实施表活剂复合驱的最佳井距为120 m。

Abstract: When the composite system flows through the reservoir, the oil displacement components are easy to be separated by chromatography due to their different migration rates, which destroys the synergistic effect of surface active agent complex flooding, and affects the oil displacement effect. The effect of chromatographic separation was studied aimed at the Polymer + Surfactant composite flooding in the Wenming Village Oilfield, and for the first time dimensionless separation coefficient was applied as the parameter to evaluate the degree of chromatographic separation. The results showed that with the increase of seepage distance, the dimensionless separation coefficient becomes larger, which indicates that the chromatographic separation phenomenon becomes larger. Combined with the reservoir profile of the Wenming Village Oilfield, comprehensively considering the formation of water absorption intensity, throat size and extent of coverage, the optimal well spacing for surface active agent flooding in this reservoir is calculated to be 120 m.