无固相/低固相聚合物钻井液低温流变特性

研究低温条件对钻井液流变性的影响,对保证在冻土地区天然气水合物钻探安全顺利的开展有着重要的意义。通过对实验室研制出的无固相聚合物钻井液与低固相聚合物钻井液流变性进行对比研究,分析两种不同类型的钻井液低温流变性的变化规律。采用赫-巴模式中的参数对无固相与低固相聚合物钻井液的流变性能进行分析比较。对无固相聚合物钻井液与低固相聚合物钻井液建立了预测黏度与温度关系的数学模型。实测数据验证表明,数学模型拟合度高,可在现场根据不同类型的钻井液采用不同的模型进行分析研究。最后采用扫描电镜对两种体系钻井液的低温流变性进行了微观机理分析。

Rheological properties of solids-free/low-solids polymer drilling fluids at low temperature

To study the effect of drilling fluid rheological property at low temperature, there is great significance to ensure the safety of gas hydrates drilling in permafrost area developed smoothly. Through the rheological property comparison with solids-free polymer drilling fluid and low-solids polymer drilling fluid, the change rule of rheological property between the two types of drilling fluids at low temperature have analyzed. The parameters of Herschel-Buckley model are adopted to analysis and comparison the rheological property with solids-free and low-solids polymer drilling fluid, and the mathematical model about relationship of viscosity with temperature have built of the two types of drilling fluids, The measured data validation show that the fit of the mathematical model is high, and it can adopt different mathematical model to analyze different types drilling fluids on worksite. Microscopic mechanism analysis of rheological property of two types drilling fluid have done by using SEM.