水基钻井液降滤失剂HPS的制备与性能改进研究

Preparation and Performance Improvement of Filtrate Reducer HPS for Water-based Drilling Fluid

姜翠玉 李亮 贾丹丹 程明杰 马怡然 苏明瑾 宋林花

JIANG Cuiyu LI Liang JIA Dandan CHENG Mingjie MAYiran SU Mingjin SONG Linhua

为了解决绿色环保型降滤失剂羟丙基淀粉（HPS）耐温性能较差等的问题，以玉米淀粉和环氧丙烷为原料，采用溶剂法制备了羟丙基淀粉（HPS），探讨了最佳反应条件，研究了HPS的摩尔取代度（MS）与其降滤失性能的关系以及HPS与几种降黏剂的复配性能。结果表明，HPS最适宜的反应条件为：反应温度60℃，反应时间20 h，环氧丙烷加量为26%（相对于淀粉质量），NaOH加量为0.7%（相对于淀粉质量），淀粉乳质量分数为45%；当MS为0.23 时HPS的降滤失效果最好；硅氟类降黏剂GF与HPS按质量比0.5∶1 复配使用（记为HPSS）时，降滤失性能得到明显的改善。加有1.5%HPSS的4%盐水泥浆可抗温至150℃，常温黏度为16 mPa·s。在140℃下与HPS相比，HPSS抗盐从10%提高到15%，抗钙从360 mg/L提高到900 mg/L，抗镁从240 mg/L提高到360 mg/L。图8 表4参9

In order to solve the problem of poor temperature resistance of hydroxypropyl starch （HPS） ，a type of environmental-friendly filtrate reducer ，HPS was prepared by the reaction of corn starch and propylene oxide in alkaline solution， the optimal reaction was probed and the relation between molar substitution degree（MS）and filtrate reducing performance of HPS was studied，and the performance of the complex system composed of HPS and several viscosity reducers was investigated. The optimum reaction conditions were as follows：reaction temperature was 60℃ ，reaction time was 20 h，the amount of propylene oxide was 26%（based on the starch mass），the amount of sodium hydroxide was 0.7%（based on the starch mass），and the starch slurry mass fraction was 45%. The filtrate reducing performance of HPS was the best when MS was 0.23. HPPS was obtained through mixing silicon-fluorine type viscosity reducer GE with HPS at mass ratio of 0.5∶1，and HPPS could resist high temperature up to 150℃ in 4% NaCl salt water muds，whose viscosity was 16 mPa·s at room temperature. Compared with HPS，at the temperature of 140℃，HPPS could resist salt，Ca2+ and Mg2+ was up to 15%，900 mg/L and 360 mg/L，respectively.

10.19346/j.cnki.1000-4092.2016.03.002