复合体系长距离运移过程中碱对组分损失的影响

Effect of Alkali on the Components Loss in Compound Flooding System during Long Distance Migration

马云飞 张 丽 侯吉瑞 赵凤兰

MA Yunfei ZHANG Li HOU Jirui ZHAO Fenglan

为揭示化学复合驱体系在地下长距离运移过程中组分浓度及吸附滞留量的变化规律， 确定碱对组分损失的影响， 用自行研制的 30 m长填砂物理模型模拟表面活性剂/聚合物 （二元）、 碱/表面活性剂/聚合物 （三元） 复合体系的驱油过程， 通过测量模型沿程不同位置处样品组分的浓度， 研究了复合体系各组分的损失、 滞留规律以及碱对降低表面活性剂和聚合物损失的作用。结果表明， 复合体系长距离运移过程中， NaOH、 表面活性剂重烷基苯磺酸盐 （HABS） 和部分水解聚丙烯酰胺 （HPAM） 大量吸附滞留于近井地带 （占模型总长 0~ 23.3%）， 其浓度随运移距离的增加而降低， 随注入体积的增加降幅变缓。NaOH可在占模型总长 23.3%的距离内分别降低 HPAM和 HABS滞留量 9.69%和 9.32%， 使这一部分组分进入深部地带。长距离运移条件下碱对降低聚合物和表面活性剂组分损失的作用有限。图8表2参17

In order to investigate the change regularity of components concentration and retention amount during long distance migration in compound flooding，and research the effect of alkali on components loss in flooding process，laboratory physical experiments were operated to simulate the surfactant/polymer（SP）flooding and alkali/surfactant/polymer（ASP）flooding using sand packed model with 30 meters long. During the injection of SP system and ASP system，samples were taken along the model through the sampling points，then the components concentration of the samples were analyzed. On this basis，the change regularity of chemical loss，retention and the effect of alkali on lowering the loss of surfactant and polymer were studied. The results indicated that the retention of alkali（NaOH），heavy alkylbenzene sulfonate surfactant（HABS）and partially hydrolyzed polyacrylamide （HPAM）was quite high in near inlet area（from inlet to 23.3% of whole length）during long distance migration of compound system. The chemicals’concentration reduced with the increase of migration distance，and the reduction relieved with the increase of injection volume. In comparison to SP system，alkali of ASP system could reduce the retention of HPAM by 9.69% and HABS by 9.32% from inlet to 23.3% of whole length，and escorted them into the in-depth area. Alkali had limited effectiveness on lowering components loss of polymer and surfactant under the condition of long distance migration.

10.19346./j.cnki.1000-4092.2017.03.025