FF-01环保酸体系综合性能评价

Evaluation of the Comprehensive Performance of the Environmentally-Friendly Acid System of FF-01

为了提升酸化压裂效果,为油田油气增产提供可能方案。以延长油田岩心为主,采用溶蚀、酸溶等方法研究了FF-01酸体系对岩心的溶蚀速率、溶蚀率和溶蚀质量、渗透率提高率及裂缝导流能力的影响,分析了其对岩心的伤害和管件设备的腐蚀情况。另外,对残酸的表/界面张力及酸液反应前后表观黏度进行了研究。结果表明,25%的FF-01环保酸具有较好的缓速溶蚀作用;FF-01环保酸处理后的岩心渗透率提高幅度为288%,且岩心导流能力增强;FF-01环保酸与岩屑反应后残渣质量为HCl残渣质量的1/6;FF-01环保酸对钢材的腐蚀速率、酸液反应后表/界面张力和残酸黏度均较低,满足环保要求。

In order to enhance the effect of acid fracturing and provide possibility for oil and gas production increase in oilfield,the dissolution rate,dissolution ratio,dissolution quality,permeability improvement rate and fracture conductivity of the FF-01 acid system to core were studied by means of dissolution and acid dissolution,with the core of Yanchang oilfield as the main source.The damage to the core and the corrosion of the pipe fittings were analyzed.In addition,the surface tension of the residual acid and the apparent viscosity before and after the acid reaction were investigated.The results show that 25% of the FF-01 environmental acid has a better corrosion inhibition effect,the permeability improvement rate of the core after treatment with FF-01 is 288%,and the conductivity of the core is enhanced.After the reaction with cuttings,the residual amount of FF-01 environmental acid is 1/6 of the amount of HCl residue.The corrosion rate of the FF-01 environment-friendly acid on steel and the surface interfacial tension after acid reaction and the viscosity of residual acid are all low,which meet the requirements of environmental protection.