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南极冰层取心钻进的关键之一是钻井液的耐温能力。根据南极冰层钻进的特点及对钻井液的特殊要求,在综合分析国内外冰层钻进钻井液应用经验的基础上,对有机硅、氟代烃、一元脂肪酸酯及二元脂肪酸酯进行了理论上的分析研究,测试了各自在不同温度条件下的粘度和密度,分析了粘度与密度变化的机理。确定出分子间相互作用中无氢键形成的物质的粘温系数最小,脂肪酸酯的粘温系数受到分子间氢键的数量影响最大,指出了介质密度的增加是由于体积收缩所致,与介质的分子结构与形态无关。所得到的结论对于极地冰层取心钻进钻井液的选择与确定具有重要的理论与实际意义。
Antarctic ice core drilling is one of the key drilling fluid temperature capability. According to the characteristics of the Antarctic ice sheet drilling and the special requirements of the drilling fluid, based on the comprehensive analysis of the domestic and international drilling fluid drilling fluid application experience, the organic silicon, fluorocarbons, monobasic fatty acid esters and binary fatty acids The theoretical analysis of esters was carried out. The viscosity and density of the esters were tested under different temperature conditions. The mechanism of viscosity and density changes was analyzed. It is found that the viscosity-temperature coefficient of the material with no hydrogen bond formed by the intermolecular interaction is the smallest, the viscosity-temperature coefficient of the fatty acid ester is most influenced by the number of intermolecular hydrogen bonds, and the increase of the medium density is caused by the volume shrinkage, The molecular structure of the medium has nothing to do with the morphology. The conclusions obtained have important theoretical and practical significance for the selection and determination of coring drilling fluid in polar ice.