化学驱工作液运移特征室内实验技术研究与应用

Research on Migration Characteristics of Chemical Flooding Fluid

在60×2.5×2.5 cm的岩心上进行物理模拟实验,对比研究浓度为1 750 mg/L时,缔合聚合物AP-P4、AP-P4与JLJ-14复配后的弱凝胶体系、AP-P4与PPG复配后的固液复合非均相体系通过岩心时的运移特征。此外对比研究复配比为2∶1的条件下,不同配方弱凝胶交联体系通过岩心时的运移规律。研究结果表明,1 750 mg/L的聚合物AP-P4加入875 mg/L的JLJ-14形成的弱凝胶交联体系和加入500 mg/L的PPG形成的固液复合非均相体系相比于单纯的聚合物体系传导性有所变差,但封堵能力增强。在聚交复配比为2∶1的条件下,不同配方的弱凝胶交联体系成胶强度随着聚合物和交联剂用量的增加而增大,运移能力随着药剂用量的增加而降低。

Under the concentration of 1 750 mg/L, core migration characteristics of associating polymer AP-P4, AP-P4 and JLJ-14 mixed weak gel system, AP-P4 and PPG mixed solid-liquid composite non-homogeneous system were studied by physical simulation experiment in the 60×2.5×2.5 cm core. In addition, when complex ratio was 2：1, the migration law of different formulations of the weak gel crosslinking system was also studied. The results showed that, compared with pure polymer, the weak gel crosslinking system with 1750 mg/L polymer AP-P4 and 875 mg/L JLJ-14,and the solid-liquid composite non-homogeneous system with 500 mg/L PPG, had worse conductivity but better plugging ability. When polymer composite ratio was 2：1, the gel strength of the weak gel crosslinking system with different formulations increased with increasing of polymer and crosslinking agent amount, and the migration ability decreased with increasing of the agent dosage.