A high salt tolerance and low adsorption drag reducer based on non-covalent enhancement

作     者：MA Yingxian ZHU Zhi GUO Jianchun ZHOU Han LI Jia XIONG Yujia MA Leyao MA Yingxian;ZHU Zhi;GUO Jianchun;ZHOU Han;LI Jia;XIONG Yujia;MA Leyao

作者机构：Petroleum Engineering SchoolSouthwest Petroleum UniversityChengdu 610500China State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu 610500China Downhole Service CompanyCNPC Chuanqing Drilling Engineering Company LimitedChengdu 610051China Geological Exploration and Development Research InstituteCNPC Chuanqing Drilling Engineering Company LimitedChengdu 610051China Shengli Oil Production PlantSinopec Shengli Oilfield BranchDongying 257000China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2020年第47卷第6期

页      面：1333-1341页

核心收录：

学科分类：0808[工学-电气工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0820[工学-石油与天然气工程] 0818[工学-地质资源与地质工程] 0807[工学-动力工程及工程热物理] 0708[理学-地球物理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 082002[工学-油气田开发工程] 0814[工学-土木工程] 

基　　金：Supported by the China National Science and Technology Major Project(2017ZX05023003) National Science Fund for Distinguished Young Scholars(51525404) 

主　　题：shale hydraulic fracturing slick water drag reducer low adsorption high salt tolerance 

摘      要：To formulate fluids with flowback water,produced water directly to improve the utilization rate of recycling and reduce the adsorption damage of slick water to reservoirs,a high salt tolerance and low adsorption drag reducer was designed and prepared by introducing polar cation fragments to enhance the non-covalent interactions between the chains.The drag reducer was characterized by IR and NMR.Friction resistance and viscosity tests were conducted to evaluate its salt resistance property.Static adsorption and dynamic adsorption retention tests were carried out to evaluate the damage of this reducer to shale reservoirs.The introduction of cation units into the molecular structure can weak the shielding effect of metal cations to some extent,so the drag reducer can keep a stable molecular structure and good resistant reducing performance under high salinity.The enhancement of non-covalent interaction between chains decreased the free polarity sites,further reduced the possibility of hydrogen bonding between drag reducer molecules and shale.In high salinity condition,both the adsorption capacity of the drag reducer on the shale surface and the average damage rate to the core permeability are low.Compared with the conventional salt-tolerant system,the overall liquid cost was reduced by 17%and the production per well increased by 44%.The application of this slick water system has achieved remarkable results.