水基钻井液用醚型纳-微米粒子的合成与性能

Synthesis and Performance of Ether Type Nano-micro Particle Used in Water-based Drilling Fluid

为揭示纳-微米粒子与地层黏土矿物的相互作用,以苯乙烯、丙烯酸丁酯及甲基丙烯酸聚乙二醇单甲醚酯大单体为主要原料,通过乳液聚合合成出聚合物粒子,用红外光谱仪对粒子结构进行了表征,用激光粒度测试仪考察了粒子的粒径分布,研究了粒子对钻井液性能的影响,讨论了粒子的作用机理。结果表明,聚合物粒子具有醚键基团结构特征,粒径分布较窄,粒径尺寸为0.2~1μm,纳米和微米粒子比约为2∶8。醚型纳-微米粒子与钻井液的配伍性良好,抗温达130℃,可有效降低聚磺、聚合物及烷基糖苷无土相钻井液的滤失性能,改善钻井液滤饼质量。

In order to reveal the interaction between nano-micro particles and clay minerals in drilling process, styrene, butyl acrylate and poly （ethylene glycol） monomethyl ether methacrylate macromonomer were used to prepared ether type polymer particles by emulsion polymerization method. The chemical structure and size distribution were determined by infrared spectrometer and laser particle size tester. The effect of particle on the performance of drilling fluids was studied and the function mechanism was discussed. The results showed that the polymer particle possessed the structural characteristic of ether bond groups. The panicle size distribution was narrow in the range of 0.2-1 μm and the ratio of nano and micro panicle was about 2： 8. Ether type nano-micro panicles had good compatibility with drilling fluid. It could be used to control the filtration of polysulfide, polymer and APG clay-free drilling fluids at temperature as high as 130℃ and improve the quality of mud cake.