疏水缔合聚合物/表面活性剂二元体系渗流特性研究

Seepage Characteristic of Hydrophobically Associating Polymer/Surfactant Binary Combination

为改善大港油田孔南地区油藏疏水缔合聚合物/表面活性剂二元体系的液流转向能力,获得良好的增油效果,研究了聚合物和表面活性剂浓度、岩心渗透率和注入水除垢对疏水缔合聚合物溶液和疏水缔合聚合物/表面活性剂二元复合体系黏度和渗流特性的影响。结果表明,聚合物溶液和二元复合体系的黏度随聚合物浓度的增加而增加,疏水缔合聚合物临界缔合浓度为1数2 g/L;在疏水缔合聚合物溶液中加入少量表面活性剂可以增强体系中疏水缔合聚合物疏水基团间的缔合作用,使黏度和渗流阻力增加;岩心渗透率越高,二元体系的阻力系数和残余阻力系数越低;用除垢软化水配制聚合物溶液和聚合物/表面活性剂二元体系的黏度最大,且聚合物浓度越小,软化水对其增黏效果越明显;用含垢软化水配制聚合物溶液和聚合物/表面活性剂二元体系的阻力系数和残余阻力系数最大、注入压力最高,液流转向效果最好。

For improving the flow-turning ability of hydrophobically associating polymer/surfactant binary combination and getting a good effect of enhancing oil recovery in Dagang oilfield, the effect of polymer and surfactant concentration, core permeability and ＇injection water descaling on the viscosity and seepage characteristics of hydrophobically associating polymer and binary combination system was studied. The results showed that the viscosity of polymer solution and binary combination system increasedwith the increase of polymer concentration. The critical association concentration of hydrophobically associating polymer was 1--2 g/L. A small amount of surfactant could enhance the association of hydrophobic associated polymer and improve the viscosity and seepage resistance of binary combination system. The higher permeability of core, the lower resistance coefficient and residual resistance coefficient of binary system was. The polymer and binary combination system configured by descaling softened water had the biggest viscosity. Besides, the smaller polymer concentration, the more obvious thickening effect of softening water was. The polymer and binary combination system configured by softened water with scale had the biggest resistance coefficient and residual resistance coefficient, the highest injection pressure and the best flow-turning ability.