部分水解聚丙烯酰胺溶液在孔喉模型中机械降解的主控因素
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摘要
为明确驱油用部分水解聚丙烯酰胺溶液在孔喉模型中机械降解的主控因素,开展部分水解聚丙烯酰胺溶液在孔喉模型中的机械降解实验,分析其流速、质量浓度及储层孔喉比和地层水总矿化度等因素对其机械降解的影响。实验结果表明:部分水解聚丙烯酰胺溶液在孔喉模型中机械降解的主控因素为流速和孔喉比,其质量浓度和地层水总矿化度对部分水解聚丙烯酰胺在孔喉模型中机械降解的影响不明显;部分水解聚丙烯酰胺溶液在孔喉模型中机械降解导致的粘度损失率随流速增加而增加,且存在临界流速和极限流速2个机械降解流速特征值;部分水解聚丙烯酰胺溶液通过串联孔喉模型时,机械降解主要发生在前4个孔喉模型,说明部分水解聚丙烯酰胺溶液在油藏中发生机械降解的关键部位是近井地带。
In order to know the main controlling factors of mechanical degradation of partially hydrolyzed polyacrylamide(HPAM)in pore-throat model,the mechanical degradation experiments of partially hydrolyzed polyacrylamide(HPAM)for polymer flooding in the pore-throat model were carried out,and the effect of flow rate,concentration,pore-throat ratio and other factors on the mechanical degradation was studied. The experimental results show that the main factors of mechanical degradation of HPAM in the pore-throat model are flow rate and pore-throat ratio,and the concentration and total salinity of formation water have little influence on the mechanical degradation of HPAM. The apparent viscosity loss caused by the mechanical degradation of HPAM in the pore throat increases with the flow rate,and there is a"critical flow rate"that the polymer molecules begin to degrade rapidly,and a"limit flow rate"at which the degradation reaches the limit. When the HPAM passes through the tandem pore-throat model,the mechanical degradation occurs mainly in the first four porethroat models,which indicates that the key position of the mechanical degradation of HPAM in the reservoirs is the near bolehole zone.
In order to know the main controlling factors of mechanical degradation of partially hydrolyzed polyacrylamide(HPAM)in pore-throat model,the mechanical degradation experiments of partially hydrolyzed polyacrylamide(HPAM)for polymer flooding in the pore-throat model were carried out,and the effect of flow rate,concentration,pore-throat ratio and other factors on the mechanical degradation was studied. The experimental results show that the main factors of mechanical degradation of HPAM in the pore-throat model are flow rate and pore-throat ratio,and the concentration and total salinity of formation water have little influence on the mechanical degradation of HPAM. The apparent viscosity loss caused by the mechanical degradation of HPAM in the pore throat increases with the flow rate,and there is a"critical flow rate"that the polymer molecules begin to degrade rapidly,and a"limit flow rate"at which the degradation reaches the limit. When the HPAM passes through the tandem pore-throat model,the mechanical degradation occurs mainly in the first four porethroat models,which indicates that the key position of the mechanical degradation of HPAM in the reservoirs is the near bolehole zone.
引文
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[17]王毅,陈洪,叶仲斌,等.疏水缔合聚合物对不同结构甜菜碱溶液动态界面张力的影响[J].油气地质与采收率,2018,25(1):122-126.WANG Yi,CHEN Hong,YE Zhongbin,et al.Effect of hydrophobically associating polymer on the dynamic interfacial tensions of betaine solutions with different structures[J].Petroleum Geology and Recovery Efficiency,2018,25(1):122-126.
[18]李洪生.河南双河油田弱碱三元复合驱矿场试验效果[J].大庆石油地质与开发,2017,36(6):115-120.LI Hongsheng.Field test results of the weak base ASP in Henan Shuanghe Oilfield[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(6):115-120.
[2]张颖苹.稠油油藏聚合物驱剖面反转现象室内实验[J].特种油气藏,2016,23(6):111-114.ZHANG Yingping.Laboratory experiment of profile inversion regulation in heavy-oil reservoir with polymer flooding[J].Special Oil&Gas Reservoirs,2016,23(6):111-114.
[3]钱思平.配注工艺对聚合物溶液的降解研究[D].北京:中国地质大学(北京),2006.QIAN Siping.Study of polymer solution degradation caused by the process of making up and injecting polymer solution[D].Beijing:China University of Geosciences(Beijing),2006.
[4]邓卫国.化学驱射孔炮眼聚合物粘度损失研究[J].特种油气藏,2008,15(增刊):69-71.DENG Weiguo.Study on polymer viscosity loss in perforation hole during chemical flooding[J].Special Oil&Gas Reservoirs,2008,15(Supplement):69-71.
[5]叶仲斌,彭杨,施雷庭,等.多孔介质剪切作用对聚合物溶液粘弹性及驱油效果的影响[J].油气地质与采收率,2008,15(5):59-62.YE Zhongbin,PENG Yang,SHI Leiting,et al.The influence of shear action in porous medium on viscoelasticity and oil displacement efficiency of polymer[J].Petroleum Geology and Recovery Efficiency,2008,15(5):59-62.
[6]杨海陵.聚合物溶液经近井地带性能变化及其对驱油效能的影响[D].成都:西南石油大学,2012.YANG Hailing.Performance of polymer solution through near wellbore and their impact on performance of flooding[D].Chengdu:Southwest Petroleum University,2012.
[7]卢祥国,闫文华,宋合龙,等.聚合物溶液流经多孔介质时剪切降解的实验研究[J].油田化学,1995,12(4):375-378.LU Xianguo,YAN Wenhua,SONG Helong,et al.An experimental study on shear degradation of HPAM solutions flowing through porous media[J].Oilfield Chemistry,1995,12(4):375-378.
[8]邵振波,周吉生,孙刚,等.部分水解聚丙烯酰胺驱油过程中机械降解研究——分子量、粘度及相关参数的变化[J].油田化学,2005,22(1):72-77.SHAO Zhenbo,ZHOU Jisheng,SUN Gang,et al.Studies on mechanical degradation of partially hydrolized polyacrylamide in course of polymer flooding:Changes in relative molecular mass,viscosity and related parameters[J].Oilfield Chemistry,2005,22(1):72-77.
[9]刘德新,赵修太,邱广敏.驱油用聚丙烯酰胺降解研究进展[J].高分子材料科学与工程,2008,24(9):27-31.LIU Dexin,ZHAO Xiutai,QIU Guangmin.Review on the degradation of polyacrylamide used for flooding[J].Polymer Materials Science&Engineering,2008,24(9):27-31.
[10] DUPAS A,HENAUT I,ROUSSEAU D,et al.Impact of polymer mechanical degradation on shear and extensional viscosities:toward better injectivity forecasts in polymer flooding operations[C].Woodlands:SPE International Symposium on Oilfield Chemistry,2013:1-11.
[11] ZAITOUN A,MAKAKOU P,BLIN N,et al.Shear stability of EOR polymers[J].SPEJ,2012,17(2):335-339.
[12]谭鑫.岩心中聚合物溶液性质变化的影响因素及规律[D].北京:中国石油大学(北京),2017.TAN Xin.Influencing factors and laws of polymer solution properties in cores[D].Beijing:China University of Petroleum(Beijing),2017.
[13]王婷婷,卢祥国,陈阳,等.渤海油田大尺寸优势通道封堵剂性能评价[J].油气地质与采收率,2017,24(6):103-107.WANG Tingting,LU Xiangguo,CHEN Yang,et al.Performance evaluation of plugging agent for large-size prefenrential channels in Bohai Oilfield[J].Petroleum Geology and Recovery Efficiency,2017,24(6):103-107.
[14]李强,梁守成,吕鑫,等.交联聚合物溶液成胶动态特征及其机理[J].大庆石油地质与开发,2017,36(4):87-94LI Qiang,LIANG Shoucheng,LüXin,et al.Gelling dynamic characteristics and their mechanisms of the crosslinking polymer solution[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(4):87-94.
[15]赵习,刘波,郭荣涛,等.储层表征技术及应用进展[J].石油实验地质,2017,39(2):287-294.ZHAO Xi,LIU Bo,GUO Rongtao,et al.Reservoir characterization and its application to development[J].Petroleum Geology&Experiment,2017,39(2):287-294.
[16]侯启军,何海清,李建忠,等.中国石油天然气股份有限公司近期油气勘探进展及前景展望[J].中国石油勘探,2018,23(1):1-13.HOU Qijun,HE Haiqing,LI Jianzhong,et al.Recent progress and prospect of oil and gas exploration by PetroChina Company Limited[J].China Petroleum Exploration,2018,23(1):1-13.
[17]王毅,陈洪,叶仲斌,等.疏水缔合聚合物对不同结构甜菜碱溶液动态界面张力的影响[J].油气地质与采收率,2018,25(1):122-126.WANG Yi,CHEN Hong,YE Zhongbin,et al.Effect of hydrophobically associating polymer on the dynamic interfacial tensions of betaine solutions with different structures[J].Petroleum Geology and Recovery Efficiency,2018,25(1):122-126.
[18]李洪生.河南双河油田弱碱三元复合驱矿场试验效果[J].大庆石油地质与开发,2017,36(6):115-120.LI Hongsheng.Field test results of the weak base ASP in Henan Shuanghe Oilfield[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(6):115-120.