A salt-induced tackifying polymer for enhancing oil recovery in highsalinity reservoirs:Synthesis,evaluation,and mechanism  

作　　者：Yining Wu Peihan Li Bin Yan Xiaohan Li Yongping Huang Juncong Yuan Xiang Feng Caili Dai 

机构地区：[1]Department of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,China [2]Department of National Engineering Laboratory for Clean Technology of Leather Manufacture,College of Biomass Science and Engineering,Sichuan University,Chengdu,610065,China [3]Department of Civil and Environmental Engineering,Princeton University,Princeton,08544,USA [4]Department of Chemical Engineering,China University of Petroleum(East China),Qingdao,266580,China

出　　处：《Green Energy & Environment》2024年第11期1747-1758,共12页绿色能源与环境（英文版）

基　　金：support of the National Natural Science Foundation of China(No.52120105007);the National Key Research and Development Program of China(2019Y FA0708700)are gratefully acknowledged.

摘　　要：Polymerflooding is an effective method widely applied for enhancing oil recovery(EOR)by reducing the mobility ratio between theinjected water and crude oil.However,traditional polymers encounter challenges in high salinity reservoirs due to their salt sensitivity.Toovercome this challenge,we synthesized a zwitterion polymer(PAMNS)with salt-induced tackifying property through copolymerization ofacrylamide and a zwitterion monomer,methylacrylamide propyl-N,N-dimethylbutylsulfonate(NS).NS monomer is obtained from thereaction between 1,4-butanesultone and dimethylamino propyl methylacrylamide.In this study,the rheological properties,salt responsiveness,and EOR efficiency of PAMNS were evaluated.Results demonstrate that PAMNS exhibits desirable salt-induced tackifyingcharacteristics,with viscosity increasing up to 2.4 times as the NaCl concentration reaches a salinity of 30×10^(4)mg L^(-1).Furthermore,highvalence ions possess a much stronger effect on enhancing viscosity,manifested as Mg^(2+)>Ca^(2+)>Na^(+).Molecular dynamics simulations(MD)andfluid dynamics experiment results demonstrate that PAMNS molecules exhibit a more stretched state and enhanced intermolecularassociations in high-salinity environments.It is because of the salt-induced tackifying,PAMNS demonstrates superior performance inpolymerflooding experiments under salinity ranges from 5×10^(4)mg L^(-1)to 20×10^(4)mg L^(-1),leading to 10.38–19.83%higher EOR thantraditional polymers.

关 键 词：High salinity reservoirs Salt-induced tackifying polymer Anti-polyelectrolyte behavior Enhanced oil recovery 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]