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脂肪酸酯的分子结构对酯基钻井液的性能具有重要的影响。在分析脂肪酸酯分子中酯基基团数、饱和度、分子构型、分子量大小以及分子间作用力的基础上,选取了6种饱和脂肪酸酯作为研究介质,测试了在不同温度条件下介质的粘度与密度,分析了影响介质粘度与密度的机理,得出了在低温下介质的粘度大小主要取决于脂肪酸酯中脂肪醇分子链的长度。介质密度的高低主要取决于脂肪酸酯的分子量,与脂肪酸酯中酯基的位置、α氢的活泼性以及分子间作用力大小无关。
The molecular structure of fatty acid esters has an important influence on the performance of ester-based drilling fluids. Based on the analysis of ester group number, saturation, molecular configuration, molecular weight and intermolecular force in fatty acid ester, six kinds of saturated fatty acid esters were selected as the research medium. The viscosity and density of the medium were analyzed. The mechanism of viscosity and density of the medium was analyzed. It was found that the viscosity of the medium at low temperature mainly depends on the length of the fatty alcohol chain in the fatty acid ester. The density of the medium depends on the molecular weight of the fatty acid ester, which is independent of the position of the ester group in the fatty acid ester, the activity of the alpha hydrogen, and the magnitude of the intermolecular force.