一种乳液型钻井液润滑剂的制备及性能评价

Preparation and evaluation of an emulsion-type drilling lubricant

以多胺、棉籽油、低碳酸为原料合成植物油酰胺,最佳合成条件为:多胺、棉籽油和低碳酸的摩尔比为1∶4∶1,反应温度168℃,反应2.5h;以合成产物植物油酰胺为主要原料,NaOH中和油酸生成油酸钠做乳化剂,硅膏、煤油和CMC-HV做添加剂,实验制备出O/W乳液型钻井液润滑剂,其配比为:8%(w)植物油酰胺+10%(w)油酸+18%(w)煤油+2.5%(w)硅膏+7.14%(w)NaOH水溶液(质量分数为20%)+0.1%(w)CMC-HV+水。性能评价表明,该润滑剂具有优越的润滑性能,用量在0.5%(w)时,钻井液润滑系数降低率≥80%,且不影响钻井液的流变性和密度。经170℃高温老化,在15%(w)盐水钻井液中,钻井液润滑系数低于0.10,表明该润滑剂具有良好的耐温抗盐性能。

Polyamine,cottonseed oil and low carbonate are taken as raw material to synthesize the vegetable oil amide.The optimum synthesis conditions are：the molar ratio of the polyamine,cottonseed oil and low carbonate is 1∶4∶1,the reaction temperature is 168 ℃,the reaction time is2.5hours;Using amide synthesis products as the main raw material,NaOH and oleic acid generated sodium oleate as emulsifier,using silicone paste,kerosene and CMC-HV as additive,O/W emulsion drilling fluid lubricant was prepared by the agent-in-oil method,and the optimal proportions are as follows：vegetable oil amide sample 8wt% ＋oleic acid 10wt% ＋kerosene 18wt% ＋silicon cream2.5wt%＋ NaOH 7.14wt%（NaOH solution concentration is 20wt%）＋ CMC-HV 0.1wt% ＋water.The performance evaluation shows that the lubricant has superior lubricating properties and the decreasing rate of drilling fluid lubrication coefficient is not lower than 80% when the amount of lubricants is 0.5wt%,and drilling fluid rheological behavior and density are not affected.The drilling fluid lubrication coefficient is lower than 0.10 after being high temperature aging at 170 ℃ and put in15wt% saline mud.The lubricant shows a good performance of temperature and salt resistance.