钻井液与完井液2025，Vol.42Issue(1)：117-126,10.DOI:10.12358/j.issn.1001-5620.2025.01.013
低腐蚀自生热冻胶压裂液流变性能及反应动力学研究
Study on Rheology and Reaction Kinetics of Low Corrosion Self-Heating Gelling Fracturing Fluids
摘要
Abstract
In heavy oil reservoir fracturing,the fracturing fluid,after entering into the reservoir,causes the reservoir temperature to decrease and the viscosity of the crude oils around the fractures to increase to even block the pore throats of the formation.To deal with this problem,a low corrosion self-heating gelling fracturing fluid has been formulated through solution blending method using urea,sodium nitrite and ammonium chloride as heat generation materials,hydrochloric acid as catalyst,the high temperature salt-resistant copolymer FS-1 as viscosifier and organic zirconium as crosslinking agent.In laboratory experiment,the heat generation and gas production properties,rheology and corrosion resistant performance of the fracturing fluid were evaluated,the constituents of the gas produced were identified,the effects of different factors on the rate of heat generation reaction were investigated,and the kinetic parameters of the heat generation reaction were understood.It was found that the self-heating generation system has good heat generation and gas production properties.The higher the concentrations of the reactants,the concentration of the acid catalyst and the initial temperature,the higher the amount of gas produced,and the shorter the time required to reach the highest temperature;on the other hand,the amount of gas is slightly decreasing with an increase in the initial temperature.In the reactant system,the existence of ammonium chloride remarkably reduces the concentration of chloric acid,this not only reduces the rate of corrosion of the fracturing fluid to the pipes for fracturing,but also is beneficial to the gelling of the fracturing fluid.The reaction produces large amount of CO2 and N2 as well as heat.Gelling of the fracturing fluid to some extent weakens the heat generation and gas production properties of the heat generation agents.The gelling fracturing fluid,after shearing at 60℃and 170 s-1 for 90 min,has viscosity of greater than 50 mPa·s.The reaction order m and n,the activation energy ΔE and the preexponential factor A of the reaction are 2.76,1.69,49.54 kJ/mol and 6.82×102,respectively.Compared with the self-heating system,the reaction rate of the self-heating gelling fracturing fluid system is greatly reduced.The process parameters of this reaction can be predicted using reaction kinetic equation and adjusted.This study has provided a base for the optimization and design of self-heating fracturing fluids.关键词
低腐蚀/自生热/冻胶压裂液/流变特性/反应动力学Key words
Low corrosion/In-situ heating/Gel fracturing fluid/Rheological properties/Reaction kinetics分类
能源科技引用本文复制引用
李芋池,罗明良,战永平,樊乔,吕元佳,赵春光..低腐蚀自生热冻胶压裂液流变性能及反应动力学研究[J].钻井液与完井液,2025,42(1):117-126,10.基金项目
国家自然科学基金"致密油储层低摩阻纳米磁流体压裂液构筑及渗吸驱油机制"(51874334). （51874334）
