一种抗盐抗高温非离子型防窜丁苯胶乳的室内研究

非离子丁苯胶乳原浆直接应用于油井水泥浆体系中时,水泥浆体系的稳定性差,适用温度低,不具有抗盐的性能,难以满足高温深井、复杂结构井固井的需求。通过在非离子丁苯胶乳原浆中加入3%非离子表面活性剂烷基酚聚氧乙烯醚(10) FB-1、1%烷基酚聚氧乙烯醚(40) FB-2,制备出一种油井水泥防窜胶乳BZT-L2。对BZT-L2胶乳的抗温、抗盐以及防窜性能评价。结果表明,在30~170℃下,加入8% BZT-L2胶乳的水泥浆的API失水量控制在50 mL以内;稠化曲线呈直角,SPN值小于3,静胶凝强度过渡时间仅为11 min,抗盐达半饱和,胶乳的加入不但可以减少水泥浆失水量,而且可以增强水泥浆的防窜性能。此外,BZT-L2胶乳与其它水泥浆外加剂的相容性好,由其配制的水泥浆体稳定,综合性能好,自由水和密度差均接近零,流变性和流动度良好,抗压强度较高。BZT-L2胶乳水泥浆可以应用于复杂结构井、小井眼井以及水平井固井。 

High Temperature Salt Resistant Nonionic Anti-channeling Styrene Butadiene Latex

Oil well cement slurries treated with nonionic styrene-butadiene latex have poor stability,low temperature tolerance and low salt resistance,not suitable for cementing high temperature deep wells or wells with complex borehole profile.An anti-channeling latex,BZT-L2,has recently been developed by adding two alkylphenol ethoxylate of different degrees of polymerization into the nonionic styrene-butadiene latex.Evaluation of the BZT-L2 latex revealed that a cement slurry treated with 8% of the latex at temperatures between 30℃ and 170℃ had API filter loss controlled less than 50 mL,and the latex can be used in saturated salt system.The latex treated cement slurries had good stability and the thickening curves were right-angled.BZT-L2 not only reduced filter loss of the cement slurries,it also rendered the cement slurries anti-channeling capability.The non-ionic styrene-butadiene latex had good compatibility with other cement slurry additives,and the general properties of cement slurries,such as rheology,free water and stability have all been excellent.