纳米植物胶钻井液低温流变特性

钻井液的低温流变特性是冻土天然气水合物钻探研究中的关键问题之一。将纳米材料应用于植物胶无固相钻井液体系;并对其低温流变特性进行专门研究具有重要意义。以KL植物胶与瓜尔胶为研究对象,采用理论分析与试验研究相结合的方法,开展了纳米植物胶钻井液低温流变特性研究。首先,通过试验分别获得了两种纳米植物胶钻井液的优化配方。然后,试验绘制其剪切应力-剪切速率变化曲线;并应用回归分析法和最小二乘法,分别采用宾汉模式、冥律模式、卡森模式以及赫-巴模式对植物胶钻井液在不同温度条件下的试验结果进行回归拟合,对其流变模式进行探讨。分析结果表明,冥律模式是描述纳米植物胶钻井液低温流变性能的最佳模式。最后应用该模式对所研究的钻井液进行了低温流变性能表征。

Nano vegetable gum drilling fluid rheology characteristic of low

The low temperature rheological properties of drilling fluid are one of the key problems in the research of rare earth gas hydrate drilling. It is very important to study the application of nanometer material to the non-solid drilling fluid system of plant glue and study its low temperature rheological properties. The KL plant gum and guar gum were used as the research object. The low temperature rheological properties of nanometer plant rubber drilling fluid were studied by means of theoretical analysis and experimental study. First, the optimal formulation of two kinds of nano-plant rubber drilling fluid was obtained through experiments. Then, the shear stress-shear rate curve was drawn and applied by regression analysis and least squares method. The model, the Carson model and the He-Ba model were used to study the rheological model of the plant rubber drilling fluid under different temperature conditions. The results show that the model is the best model to describe the low temperature rheological properties of nanometer plant rubber drilling fluid. Finally, this model is used to characterize the drilling fluid studied at low temperature.