Ca^(2+)和Mg^(2+)对聚/表二元体系性能影响研究——以大港孔南高盐高温高凝油藏为例

The Effect of Ca^(2+) and Mg^(2+) on Polymer/Surfactant Binary Combination:Taking the Reservoirs of Kongnan Block in Dagang Oilfield as an Example

近年来,随着石油消费量增加和新增探明储量减少,石油公司开始重视非常规油藏开发工作。大港油田孔南地区属于高温高盐高凝油藏。为提高无碱聚/表二元复合驱增油降水效果,以大港孔南地区储层地质和流体为模拟对象,开展了溶剂水处理方式对聚/表二元体系性能影响研究。结果表明,消除注入水中Ca^(2+)和Mg^(2+)可以增加疏水缔合聚合物缔合程度,增大聚合物溶液和聚/表二元体系黏度和滞留量,进而增强液流转向效果。在疏水缔合聚合物溶液中加入成垢剂后,不仅可以消除钙镁离子,而且还能够形成微小垢颗粒,它们由聚合物溶液携带集中进入岩石孔隙,进一步增强了疏水缔合聚合物溶液和聚/表二元体系液流转向能力。与注入水和除垢水相比,含垢水配制聚/表二元体系液流转向能力较强,采收率增幅较大。

In recent years,more attention was paid to unconventional reservoir development due to the increase in oil consumption and the reduction of new proved reserves.The reservoirs of Kongnan Block in Dagang Oilfield belong to the high temperature,high salinity and hypercoagulable reservoirs.In order to improve the effect of polymer/surfactant binary combination flooding,the effect of solvent water treatment on polymer/surfactant binary combination based on Kongnan Block of Dagang Oilfield reservoir geological characteristics and fluid properties was studied.The results show that,elimination of the Ca^（2＋） and Mg^（2＋） in the injected water can enhance the association of hydrophobic associated polymer and improve the viscosity and flow-turning ability of polymer/surfactant binary combination. After adding into the polymer/surfactant binary combination,not only can eliminate the adverse effect of Ca^（2＋） and Mg^（2＋） on the salt resistance of hydrophobic associated polymer,but also can form a large number of particles which can further enhance flow-turning ability by entering reservoir porosity.Compared with injected water and softened water,the flow-turning ability and recovery of the polymer/surfactant binary combination which is configured by softened water with particles are better.