粘弹自调控水调驱剂的制备及其性能  

Preparation and properties of viscoelastic self-regulating water profile control and flooding agent

作　　者：易萍[1,2] 张荣[1,2] 马波[1,2] 程辰 师涛[3] 赖小娟 米楚 YI Ping;ZHANG Rong;MA Bo;CHENG Chen;SHI Tao;LAI Xiao-juan;MI Chu(Research Institute of Oil&Gas Technology,Changqing Oilfield Branch Company of PetroChina,Xi′an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeable Oil and Gas Fields,Xi′an 710018,China;The Eighth Oil Production Plant,Changqing Oilfield Branch Company of PetroChina,Xi′an 710018,China;College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油长庆油田分公司第八采油厂,陕西西安710018 [4]陕西科技大学化学与化工学院,陕西西安710021

出　　处：《陕西科技大学学报》2021年第6期97-102,共6页Journal of Shaanxi University of Science & Technology

基　　金：陕西省科技厅重点研发计划项目(2021GY-142);陕西省科技厅国际科技合作计划项目(2020KW-025);陕西省西安市科技计划项目(2020KJRC0004);陕西省教育厅科研计划项目(21JC005)。

摘　　要：水解聚丙烯酰胺具有盐敏性,且在储层孔隙中经过强剪切后其聚合物分子链会发生变形和断裂,导致聚合物溶液粘度迅速下降,降低调驱聚合物的波及系数.通过后水解法制备了具有不同疏水碳链长度的粘弹性聚合物(C12-HPAM、C16-HPAM、C18-HPAM),利用红外光谱(FT-IR)、扫描电镜(SEM)、热重(TG)、流变、岩心驱替装置对产物进行结构表征及性能测试,通过与常规聚丙烯酰胺(PAM)对比,确定了不同疏水碳链对后水解聚合物的性能影响.结果表明,引入不同疏水碳链和抗盐单体后,聚合物HPAM的热稳定性及抗盐性均有所提高,通过粘弹性测试发现,在高剪切作用下粘弹性聚合物的物理缔合被破坏,粘度下降,剪切作用撤除,缔合作用可恢复,结构粘度重新建立,HPAM具有粘弹自恢复性,有利于形成调驱作用,实现聚合物粘弹性自调控的设计.通过驱油效率测试,在0.15%的加量下,C18-HPAM调驱剂的驱油效率可达到89.1%,可广泛应用于低渗、特低渗油藏.Hydrolyzed polyacrylamide is salt sensitive,and its polymer molecular chain will deform and fracture after strong shear in reservoir pores,resulting in the rapid decrease of polymer solution viscosity and the sweep coefficient of profile control and flooding polymer.The viscoelastic polymers with different hydrophobic carbon chains(C12-HPAM,C16-HPAM,C18-HPAM)were prepared by post hydrolysis method.The structure and properties of the products were characterized by FT-IR,SEM,TG,rheology and core displacement devices.The effects of different hydrophobic carbon chains on the properties of post hydrolyzed polymers were determined.The results show that the thermal stability and salt resistance of HPAM are improved by introducing different hydrophobic carbon chains and salt resistant monomers.Through viscoelastic test,it is found that the physical association of HPAM is destroyed,the viscosity is decreased,the shear action is removed,the association action is restored,and the structural viscosity is reestablished under high shear,which has viscoelastic self recovery and is conducive to the formation of profile control and flooding,The design of self-regulation of polymer viscoelasticity is realized.Through the displacement efficiency test,the displacement efficiency of C18-HPAM can reach 89.1%at the dosage of 0.15%.It can be widely used in low permeability and ultra-low permeability reservoirs.

关 键 词：疏水碳链 聚合物 后水解 自调控 调驱剂 

分 类 号：TE3[石油与天然气工程—油气田开发工程]