南极冰层取心钻探酯基钻井液抗低温性能试验

Experiment on resistance to low temperature performance of ester drilling fluid in Antarctic ice core drilling

钻井液的选择是顺利进行极地科学钻探工程的关键技术之一。为寻找一种新型安全、环保的耐低温钻井液,笔者深入分析一元脂肪酸酯与二元脂肪酸酯分子结构特点,对三种不同混合酯的耐低温性能进行了试验研究,测试了三种混合酯的黏度与密度随温度的变化。试验发现,当温度下降时,混合酯的黏度都存在一个稠化温度,稠化温度的高低受酯的分子结构、分子量及分子间作用力的影响。混合酯的组成、分子结构及分子间作用力大小不影响密度随温度的变化关系,但对密度的大小与密度增加的速度影响较大。

One of the key techniques of successfully completing the polar sciantific drilling is to find a kind of available drilling fluid. In order to find a new type of drilling fluid with low temperature resistance for safety and environmental protection, the authors analyzed the structural characteristics of the monobasic fatty acid ester with a dibasic fatty acid ester molecule, and studied the capability of three mixed ester in low-temperature. The changes of viscosity and density with temperature of the three kinds of mixed ester were tested. The results showed that when the temperature dropped, the viscosity of the mixed ester had a thickening temperature, and the level of thickening temperature was effected by the ester molecular structure, molecular weight and intermolecular force. The composi- tion of mixed ester, molecular structure and the intermolecular force were not affeetted the changes of density with temperature, but the impact for the size and the increasing speed of density were bigger.