纳米SiO2增强型清洁压裂液的制备及性能
Preparation and performance of nano-SiO2-enhanced clean fracturing fluid
杨晓武 1李小斌 1鄢长灏 2刘笑春 2王晨1
作者信息
- 1. 陕西科技大学 化学与化工学院,陕西 西安 710021;陕西科技大学 陕西省轻化工助剂重点实验室,陕西 西安 710021
- 2. 中国石油 长庆油田分公司 油气工艺研究院,陕西 西安 710018
- 折叠
摘要
以芥酸酰胺丙基二甲胺和H2O2 为原料制备了长碳链氧化胺表面活性剂(EDAAO),并以EDAAO为主剂构建压裂液体系,向体系中引入纳米SiO2 颗粒,制得纳米SiO2 增强型清洁压裂液,通过室内实验考察了该压裂液的流变性能、携砂性能及破胶性能等关键指标.实验结果表明,纳米SiO2 增强型清洁压裂液的最优配方为:2.5%(w)EDAAO+0.8%(w)水杨酸钠+3.0%(w)KCl+0.1%(w)纳米SiO2,SiO2 粒径为 10 nm;该压裂液的耐温温度最高可达 120℃,相较于普通压裂液提升了20%;在90℃、剪切速率170 s-1 的条件下持续剪切1.5 h,纳米SiO2 增强型清洁压裂液的黏度能够稳定维持在85 mPa·s以上,较不含纳米颗粒的压裂液黏度高 2.43 倍;采用煤油作为破胶剂,当煤油用量超过2.0%(w)时,纳米SiO2 增强型清洁压裂液可在 60 min内实现破胶,黏度降至 5 mPa·s以下;该压裂液的破胶液具有低伤害特性,与地层水具有良好的配伍性,满足清洁压裂液的应用要求.
Abstract
A long-chain amine oxide surfactant(EDAAO)was synthesized with erucamide propyl dimethylamine and H2O2 as raw materials,and a fracturing fluid system was formulated with EDAAO as the main agent.Nano-SiO2 particles were introduced into the system to prepare nano-SiO2-enhanced clean fracturing fluid.The rheology,sand-carrying capacity,gel-breaking performance,and other key indicators of the fracturing fluid were investigated through laboratory experiments.The results show that the optimum proportion of clean fracturing fluid is as follows:2.5%(w)EDAAO+0.8%(w)sodium salicylate+3.0%(w)KCl+0.1%(w)nano-SiO2,particle of SiO2 is 10 nm.The maximum temperature resistance of the obtained fracturing fluid is increased by 20%compared with the ordinary fracturing fluid,achieving a maximum temperature resistance of 120℃.Under 90℃and 170 s-1 for 1.5 h,the viscosity of the nano-SiO2-enhanced clean fracturing fluid can reach over 85 mPa·s,which is 2.43 times higher than that of fracturing fluids without nanoparticles.When kerosene is used as a gel breaker,if its dosage exceeds 2.0%(w),then the nano-SiO2-enhanced clean fracturing fluid can achieve gel breaking within 60 min,with the viscosity dropping below 5 mPa·s.The gel breaking of fracturing fluid has low damage characteristics and good compatibility with formation water,which meets the application requirements of clean fracturing fluids.
关键词
纳米改性/清洁压裂液/黏弹性/氧化胺/表面活性剂Key words
nanomodification/clean fracturing fluid/viscoelasticity/amine oxide/surfactant引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据