摘要
聚合物降黏剂在提高普通稠油油藏采收率方面展现出良好的应用前景。通过对比部分水解聚丙烯酰胺(HPAM)和2种聚合物降黏剂(P-OVR-1,P-OVR-3)的基本性能和乳化降黏性能,深入研究了HPAM,P-OVR-1,P-OVR-3溶液的表观黏度和活性在驱替过程中对提高采收率所做的贡献。结果表明:P-OVR-1和P-OVR-3具有很好的乳化降黏性能,主要通过乳化分散原油,其形成乳状液的粒径越小,降黏效果越好。在P-OVR-1和P-OVR-3的水相增黏、油相乳化降黏作用下,大孔和小孔的采收率均有不同程度的提高,其中P-OVR-3驱替后大孔、小孔的采收率提高值分别为8.48%和9.59%。小孔中的剩余油主要依靠聚合物降黏剂溶液的黏弹性采出,在大孔中,主要依靠聚合物降黏剂溶液的高活性,降低毛管压力、黏附力和内聚力等,实现柱状残余油和油膜的高效驱替。
Polymer viscosity reducer shows a good application prospect in the recovery of conventional heavy oil reservoirs.The basic properties and emulsifying viscosity reduction properties of partially hydrolyzed polyacrylamide(HPAM)and two polymer viscosity reducers(P-OVR-1 and P-OVR-3)were compared in this paper.The contributions of their apparent vis⁃cosity and activity to enhanced oil recovery during the displacement were studied in depth.The results show that P-OVR-1 and P-OVR-3 have good emulsifying viscosity reduction properties for heavy oil,mainly through emulsifying and dispers⁃ing the crude oil.The smaller the particle size of the emulsion comes with a better viscosity reduction effect.Under the ef⁃fects of increasing water-phase viscosity and reduced oil-phase emulsifying viscosity of P-OVR-1 and P-OVR-3,the oil recovery in large pores and small pores was increased in varying degrees.The enhanced oil recoveries of large and small pores after P-OVR-3 flooding were 8.48%and 9.59%respectively.The residual oil in small pores was mainly obtained by the viscoelasticity of polymer viscosity reducers.In large pores,the efficient displacement of columnar residual oil and oil film was realized mainly depending on the high surface activity of polymer viscosity reducer to reduce the capillary force,adhesion and cohesion.
作者
杨斌
YANG Bin(Science and Technology Management Department,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2021年第6期107-113,共7页
Petroleum Geology and Recovery Efficiency
基金
国家重点研发计划项目“稠油化学复合冷采基础研究与工业示范”(2018YFA0702400)。
关键词
稠油油藏
聚合物降黏剂
表观黏度
冷采
提高采收率
heavy oil reservoir
polymer viscosity reducer
apparent viscosity
cold recovery
enhanced oil recovery
作者简介
杨斌(1977-),男,山东滨州人,高级工程师,硕士,从事油田新产品技术开发工作。E-mail:yangbin926.slyt@sinopec.com。
