一种油基钻井液增粘剂的合成

Synthesis of an oil-based drilling fluid thickening agent

合成了一种油基钻井液增粘剂磷酸酯铝。磷酸三乙酯和五氧化二磷反应生成聚磷酸酯,进而与正癸醇、正辛醇、月桂醇和正丁醇的混合醇反应生成磷酸酯混合物,最后与铝盐反应,生成二取代的磷酸酯铝。结果表明,合成聚磷酸酯的最佳反应条件是:磷酸三乙酯与五氧化二磷的摩尔比1.40∶1,反应温度86℃,反应时间4 h;合成二烷基磷酸酯的最佳反应条件是:正癸醇、正辛醇、月桂醇、正丁醇的质量分数分别为24%,24%,24%和28%,混醇与五氧化二磷的摩尔比3.8∶1,反应温度125℃,反应时间4 h。用IR表征了其结构。该增粘剂能配制柴油基油包水乳化钻井液,体系具有较好的乳化稳定性和较低的滤失量。

Using triethyl phosphate and phosphorus pentoxide as raw materials to synthesize polyphosphate intermediates,then generated phosphate intermediates with the mixtures of n-decanol,n-octanol,lauryl alcohol and n-hexy1 alcohol,and finally the aluminum salt was added,a aluminum dialkyl phosphate was synthesized.The results show that the optimal reaction conditions of the phosphate monoester＇s production are that： the mole ratio of phosphate and phosphorus pentoxide is 1.40∶1,reaction temperature is 86 ℃,reaction time is 4 h.The dialkyl phosphate＇s best reaction conditions are that： the mass fractions of n-decanol,n-octanol,Lauryl alcohol and n-hexyl alcohol respectively is 24%,24%,24%,28%,the mole ratio of them and phosphorus pentoxide is 3.8∶1,reaction temperature is 125 ℃,reaction time is 4 h.The chemical structure was characterized by IR.The diesel oil-based drilling fluid has been prepared,and the system has a good emulsion stability and low filtration.