Due to the limited space on offshore platforms, the large-scale application of polymer flooding technology in offshore oilfields is restricted. Accelerated polymer dissolution is one of the key technologies to support the scaled implementation of polymer flooding in offshore oilfields. To this end, optimization studies have been conducted on factors such as the packing pore size of the enhanced super mass transfer rapid dissolution device, the mass transfer factor, the structure of the mass transfer ring, and the feed rate, in order to obtain the optimal application parameters. The study shows that smaller packing pore sizes and higher mass transfer factors lead to faster polymer dissolution. However, excessively small pore sizes and high mass transfer factors can cause significant viscosity loss. Different combinations of mass transfer rings result in varying degrees of reduction in polymer dissolution time and viscosity loss of the polymer solution. The best mass transfer effect is achieved with a mass transfer ring structure of 300 μm × 1 038 (outer ring) + 200 μm × 1 307 (inner ring). The feed rate has a relatively minor impact on the dissolution time and viscosity of the polymer. The site application results show that after the introduction of the enhanced super mass transfer rapid dissolution device, the dissolution time of polymer mother liquor with a mass concentration of 2 500 mg/L is reduced from 41 minutes to 19 minutes. The footprint of the polymer preparation and injection system is decreased by 50.23%, and the operational mass is reduced by 53.6%. The system has successfully achieved miniaturization and high efficiency, effectively saving platform space. This technology provides a technical guarantee for the efficient application of polymer flooding in offshore oilfields.
[1] 曹绪龙,季岩峰,祝仰文,等.聚合物驱研究进展及技术展望[J].油气藏评价与开发,2020,10(6):8-16.
CAO Xulong,JI Yanfeng,ZHU Yangwen,et al.Research advance and technology outlook of polymer flooding[J].Reservoir Evaluation and Development,2020,10(6):8-16.
[2] 谢晓庆,冯国智,刘立伟,等.海上油田聚合物驱后提高采收率技术[J].油气地质与采收率,2015,22(1):93-97.
XIE Xiaoqing,FENG Guozhi,LIU Liwei,et al.Study on enhanced oil recovery technology after polymer flooding in offshore oilfield[J].Petroleum Geology and Recovery Efficiency,2015,22(1):93-97.
[3] 张凤久,姜伟,孙福街,等.海上稠油聚合物驱关键技术研究与矿场试验[J].中国工程科学,2011,13(5):28-33.
ZHANG Fengjiu,JIANG Wei,SUN Fujie,et al.Key technology research and field test of offshore viscous polymer flooding[J].Strategic Study of CAE,2011,13(5):28-33.
[4] 张波,由庆,张健,等.海上油田聚合物驱降压增注技术[J].断块油气田,2010,17(5):624-627.
ZHANG Bo,YOU Qing,ZHANG Jian,et al.Technology of depressurization and augmented injection for polymer flooding in offshore oilfield[J].Fault-Block Oil & Gas Field,2010,17(5):624-627.
[5] 李梦坤,高立新,迟振浩.疏水缔合聚合物熟化时间和流变性测试[J].油气田地面工程,2021,40(1):18-24.
LI Mengkun,GAO Lixin,CHI Zhenhao.Maturation time and rheological test of hydrophobic associating polymer[J].Oil-Gas Field Surface Engineering,2021,40(1):18-24.
[6] 舒政,杨雅兰,陈文娟,等.甲酰胺对聚合物溶解时间及渗流特征的影响[J].精细石油化工,2020,37(3):32-37.
SHU Zheng,YANG Yalan,CHEN Wenjuan,et al.Effect of formamide on dissolution time and percolation characteristics of polymer[J].Specialty Petrochemicals,2020,37(3):32-37.
[7] 朱诗杰,叶仲斌,施雷庭,等.驱油用聚合物溶液的流变模型应用优化研究[J].油气藏评价与开发,2022,12(4):677-683.
ZHU Shijie,YE Zhongbin,SHI Leiting,et al.Application and optimization of rheological model of polymer solution for oil displacement[J].Reservoir Evaluation and Development,2022,12(4):677-683.
[8] 朱诗杰,施雷庭,王晓,等.聚集行为对聚合物溶液性能的影响研究[J].应用化工,2020,49(3):597-601.
ZHU Shijie,SHI Leiting,WANG Xiao,et al.Study on the effect of aggregation behavior on the properties of polymer solutions[J].Applied Chemical Industry,2020,49(3):597-601.
[9] 李玺,罗平亚,叶仲斌,等.化学方法加速疏水缔合聚合物的溶解[J].油田化学,2022,39(2):324-330.
LI Xi,LUO Pingya,YE Zhongbin,et al.Accelerating the dissolution of hydrophobically associative polymer by cyclodextrin[J].Oilfield Chemistry,2022,39(2):324-330.
[10] 刘敏,邹明华,吴华晓,等.海上油田聚合物驱平台配注工艺技术[J].中国海上油气,2010,22(4):259-261.
LIU Min,ZOU Minghua,WU Huaxiao,et al.Injection distribution technique on platform for offshore polymer flooding[J].China Offshore Oil and Gas,2010,22(4):259-261.
[11] 舒政,陶刚,赵文森,等.海上平台提高母液配制浓度减小配注系统总体积的可行性分析[J].中国海上油气,2018,30(5):123-130.
SHU Zheng,TAO Gang,ZHAO Wensen,et al.Feasibility analysis on reducing the total volume of injection allocation system by increasing the concentration of mother liquor on offshore platform[J].China Offshore Oil and Gas,2018,30(5):123-130.
[12] 舒政,齐勇,程飞豹,等.海上油田聚合物超重力速溶技术研究[J].油气地质与采收率,2021,28(3):142-146.
SHU Zheng,QI Yong,CHENG Feibao,et al.Research on high-gravity instant dissolving technology of polymers in offshore oilfields[J].Petroleum Geology and Recovery Efficiency,2021,28(3):142-146.
