摘要
以乳酸、葡萄糖酸、聚乙烯亚胺(PEI)及聚丙烯酰胺类稠化剂为主要原料,采用溶液共混法制备了一种环境友好型耐高温交联酸EAC-1。结合FTIR、流变测试、SEM等分析了乳酸与葡萄糖酸混合形成的复合酸溶蚀CaCO3的协同作用机理以及交联酸EAC-1的流变性、微观结构以及破胶性能,明确了交联酸的反应速率常数及其反应动力学方程。结果表明,当乳酸及葡萄糖酸物质的量比为1∶1时,乳酸和葡萄糖酸可与Ca^2+通过共价键作用形成一种具有高溶解度的螯合物,使残酸中无二次沉淀生成;当PEI质量分数为0.12%时, 170 s^–1、110℃下交联酸黏度保持在50 mPa·s以上;交联剂PEI与稠化剂形成的立体网状结构保证体系具有良好的耐温耐剪切能力,且交联酸破胶均匀,无残渣,破胶液黏度仅为4.2 mPa·s;EAC-1的反应速率常数比以盐酸为主体酸的交联酸HC-1小1个数量级,表明EAC-1交联酸具有良好的缓速性能,有利于延长酸液有效作用距离。
An environmental-friendly crosslinked acid(EAC-1) with high-temperature resistance was prepared by solution blending method using lactic acid, gluconic acid, polyethyleneimine(PEI) and polyacrylamide thickener as main raw materials. The synergistic mechanism of Ca CO3 dissolution by complex acid composed of lactic acid and gluconic acid, the rheology, microstructures and gel breaking properties of EAC-1 were analyzed by FTIR, rheological test, SEM and so on. The reaction rate constant and reaction kinetic equation of crosslinked acid were also determined. The results showed that when the molar ratio of lactic acid to gluconic acid was 1∶1, lactic acid and gluconic acid could form a chelate with high-solubility with Ca^2+ through covalent bond, and no secondary precipitation happened in the residual acid. The viscosity of crosslinked acid maintained above 50 m Pa·s at 170 s^–1 and 110 ℃ when the mass fraction of PEI was 0.12%. The three-dimensional network structure formed by crosslinking agent PEI and thickener made the system have good high-temperature resistance and shearing resistance. The crosslinked acid exhibited uniform gel breaking without residues, and the viscosity was 4.2 mPa·s after gel breaking. The reaction rate constant of EAC-1 was one order of magnitude smaller than that of HC-1 using hydrochloric acid as main acid, showing that crosslinked acid EAC-1 had good retarding effect for prolonging the effective action distance of acid fluid in acidizing fracturing.
作者
罗明良
巩锦程
战永平
司晓冬
罗帅
李钦朋
LUO Mingliang;GONG Jincheng;ZHAN Yongping;SI Xiaodong;LUO Shuai;LI Qinpeng(Key Laboratory of Unconventional Oil&Gas Developm ent,Ministry of Education,China University of Petroleum(East China),Qingdao 266580,Shandong,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2020年第4期834-840,共7页
Fine Chemicals
基金
国家自然科学基金(51874334,51674278)
山东省自然科学基金(ZR2018MEE010)
“十三五”国家科技重大专项(2017ZX005030005)。
关键词
交联酸
酸岩反应动力学
缓速性能
油田化学品与油品添加剂
crosslinked acid
acid-rock reaction kinetics
retarding property
oil field chemicals and petroleum additives
