树枝状压裂液交联剂的合成及抗盐性研究  

Synthesis of dendritic crosslinking agents for fracturing fluids and the salt resistance

作　　者：常娜娜 赵丹[1] 曹清昭 秦芳玲[1,2] 张科良[1,2] 吴亚[1,2] CHANG Nana;ZHAO Dan;CAO Qingzhao;QIN Fangling;ZHANG Keliang;WU Ya(Shaanxi Engineering Research Center of Green Low-carbon Energy Materials and Processes,Xi’an Shiyou University,Xi’an 710065,China;Engineering Research Center of Oil and Gas Field Chemistry,Universities of Shaanxi Province,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学陕西省绿色低碳能源材料与过程工程技术研究中心,陕西西安710065 [2]西安石油大学油气田化学陕西省高校工程研究中心,陕西西安710065

出　　处：《应用化工》2024年第12期2886-2891,2896,共7页Applied Chemical Industry

基　　金：陕西省重点研发计划项目(2022GY-162,2019KW-061);陕西省陆相页岩气成藏与开发重点实验室(筹)开放课题;西安石油大学研究生精品案例库建设项目(2023-X-YAL-008)。

摘　　要：通过氯代反应、Gabriel反应,以三乙醇胺合成树枝状三(2-氨基乙基)胺,进一步与硼砂、多元醇反应合成三(2-氨基乙基)胺硼酸酯交联剂,并通过IR、NMR对产物及中间体进行结构鉴定。将0.3%胍胶基液与树枝状胺硼酸酯以100∶4交联比交联,同时对比直线型三乙烯四胺硼酸酯交联剂,考察盐对交联胍胶压裂液的挑挂情况、表观黏度、抗剪切性能的影响。在高浓度的Na^(+)、Mg^(2+)、Ca^(2+)、Fe^(3+)溶液中,树枝状交联剂体系中显示了较好的挑挂性和较高的表观黏度,尤其在高浓度Ca^(2+)、Fe^(3+)溶液中。在183 g/L的高矿化度地下水中80℃、170 s^(-1)的剪切速率下持续剪切60 min后,树枝状交联胍胶黏度在70 mPa·s以上,能够满足高矿化度水基压裂液压裂施工的要求。SEM微观形貌分析显示在高矿化度地下水中树枝状交联剂交联胍胶保持分子链展开,形成错综缠绕的空间网络结构,且抑制高价金属离子结晶,从而具有良好的黏弹性。Dendritic tris(2-aminoethyl)amine was synthesized from triethanolamine through chlorination reaction and Gabriel reaction,and further reacted with borax and polyols to synthesize tris(2-aminoethyl)amine borate ester crosslinking agent.The structure of the product and intermediate was identified by IR and NMR.Crosslink 0.3%guanidine gum based fluid with dendritic amine borate ester in a 100∶4 crosslinking ratio,and compare the linear triethylenetetramine borate ester crosslinking agent to investigate the effect of salt on the suspension,apparent viscosity,and shear resistance of cross-linked guanidine gum fracturing fluid.In high concentrations of Na^(+),Mg^(2+),Ca^(2+),and Fe 3+solutions,the dendritic crosslinking agent system exhibits good hanging properties and high apparent viscosity,especially in high concentrations of Ca^(2+)and Fe 3+solutions.After continuous shear for 60 min at a shear rate of 80℃ and 170 s^(-1) in high salinity groundwater of 183 g/L,the viscosity of branched cross-linked guanidine gum is above 70 mPa·s,which can meet the requirements of high salinity water-based hydraulic fracturing construction.SEM microscopic morphology analysis shows that in high salinity groundwater,the dendritic crosslinking agent crosslinked guanidine gum maintains the unfolding of molecular chains,forming a tangled spatial network structure,and inhibits the crystallization of high valence metal ions,thus exhibiting good viscoelasticity.

关 键 词：抗盐性 交联剂 压裂液 合成 SEM微观分析 

分 类 号：TQ028.8[化学工程]