耐温抗盐高效聚合物微球性能评价与应用效果

Performance Evaluation and Application Effect of High Efficiency Polymer Microsphere with Temperature and Salt resistance

深部液流转向技术是渤海油田目前亟需突破的问题。采用倒置生物显微镜以及岩心驱替实验对3种聚合物微球进行了性能评价,并在渤海B油田开展了微球矿场试验。结果表明,在渤海油藏环境(温度65℃、矿化度8.9 g/L)下,与SMG和COSL微球相比,NWKY微球(主要成分为带有丙烯酰胺-2-甲基丙磺酸和疏水单体等基团的交联聚合物)在模拟水中缓慢膨胀7 d的粒径从1.98μm增至18.14μm,水化膨胀效果较好(膨胀倍数最大);在高矿化度水和低矿化度水中的粒径和膨胀倍数接近,耐盐性良好。在95℃下,NWKY微球仍具有良好的缓膨效果,耐温性能良好。NWKY微球适应的储层渗透率为200×10^(-3)1500×10^(-3)μm^(2),满足油田需求。NWKY微球在渤海B油田现场实施取得了较好的效果,递减增油7432 m^(3)。

Deep fluid diversion technology is an urgent problem to be solved in Bohai oilfield.In this paper,the performance of three kinds of polymer microspheres was evaluated by biomicroscopy technology and core displacement experiment.Furthermore,the field test of microsphere was carried out in Bohai B oilfield.The results showed that under the environment of Bohai reservoir,such as 65℃temperature and 8.9 g/L salinity,compared with SMG and COSL microsphere,the size of NWKY microsphere whose main component was crosslinked polymer with acrylamide-2-methylpropanesulfonic acid and hydrophobic monomer increased from 1.98μm to 18.14μm after expanding slowly for 7 days in simulated water.The expansion multiple was the largest,indicating good hydration expansion effect.The particle size and expansion multiple were close in high salinity water and low salinity water,showing good salt resistance.Under the condition of 95℃,NWKY microsphere still had good slow expansion effect,indicating good temperature resistance.The adaptive reservoir permeability of NWKY microsphere was 200×10^(-3)—1500×10^(-3)μm^(2),which could meet the needs of oilfield.The implementation of NWKY microsphere in Bohai B oilfield achieved good results.The incremental oil of expected was 7432 m^(3).