摘要
针对海上油田非均质性较强的特点,为了强化聚合物驱在海上油田的应用,以丙烯酰胺(AM)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、丙烯酰氧乙基三甲基氯化铵(DAC)为单体,采用反相悬浮聚合法制备了交联聚合物微球,研究了该交联聚合物微球分散体系的微球形态、封堵性能,并将其与聚合物HAP复配进行驱油实验。研究结果表明:所合成的交联聚合物微球在模拟水中溶胀10 d后尺寸在27～37μm左右,该微球具有很好的封堵效果,向尺寸Ф2.5 cm×60 cm、水测渗透率1.064μm^2的填砂管中注入3 PV熟化10 d的质量分数0.04%的交联聚合物微球后,前端压力从7.9 k Pa增至190 k Pa,中后端的压力也有不同程度的上升。并联岩心驱油实验表明,注入聚合物(0.145%HAP)/交联聚合物微球(0.03%)复配体系后有20%流体转入低渗透岩心,复配体系的提高原油采收率效果比单纯的聚合物驱(0.175%HAP)高10%以上。非均质岩心驱油实验结果也表明复配体系提高采收率比单纯聚合物驱的高6%。交联聚合物微球能够较好地改善聚合物驱的效果。
Aimed at the characteristics of strong heterogeneity in offshore oil field, in order to strengthen the application of polymer flooding in offshore oil field, The crosslinked polymer microsphere （CPM） was prepared by inverse suspension polymerization using acrylamide, 2-acrylamido-2-methylpropane sulfonic acid and 2-acryloxyethyl trimethyl ammonium as main raw materials, and the shape in the dispersions system and plugging performance of CPM was investigated, furtherly, the oil displacement performance of the complex system, composed of 0.145% HAP and 0.03%CPM, was probed. The results showed that after the CPM was swelled for 10 days in the simulated water, the size was about 27-37μm. The CPM had good plugging effect, whert the 3 PV CPM system with the mass fraction of 0.04% was injected into the sand filling tube with permeability of 1.064 μm^2 and the size of φ2.5 cm×60 cm, the front pressure increased from 7.9 kPa to 190 kPa, at the same time, the middle and end pressure increased to some degree. Parallel cores oil displacement experiment showed that 20% of fluid flowed into low permeability cores. The enhanced oil recovery of the complex system was also higher than that of the pure polymer flooding by 10%. Heterogeneous core displacement experiment also showed that the enhanced oil recovery of complex system was higher than that of the pure polymer flooding by 6%. In a word, the CPM could improve greatly the effect of polymer flooding.
出处
《油田化学》
CAS
CSCD
北大核心
2016年第4期687-691,704,共6页
Oilfield Chemistry
基金
国家科技重大专项"海上稠油高效开发新技术"(项目编号2011ZX05024-004-05)
关键词
交联聚合物微球
海上油田
封堵性能
提高采收率
复配体系
crosslinked polymer microspheres
offshore oil field
plugging peoCormance
enhanced oil recovery
complex system
