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Ｌ—Ｍ流变模式是一个三参数流变模式，它能较好地反映钻井液、水泥浆及高分子溶液等非牛顿液体的流变性能〔１〕，并具有适应范围广、精度高的特点。文中对Ｌ—Ｍ液体流变参数的计算方法进行了分析，指出使用旋转粘度计测量该液体的有关参量和应用牛顿液体剪切速率计算其流变参数时，所存在的问题和引起的误差。文中根据Ｌ—Ｍ液体的本构方程，推导出该液体在旋转粘度计中作周向运动的规律及剪切速率的计算公式，找出了Ｌ—Ｍ液体剪切速率与牛顿液体剪切速率及流变参数的关系，并提出了一套准确计算Ｌ—Ｍ液体流变参数的方法。
L-M rheological model is a three-parameter rheological model, which can better reflect the rheological properties of non-Newtonian liquids such as drilling fluids, grouts and polymer solutions [1], and has a wide range of adaptation, high precision Features. In this paper, the calculation method of L-M liquid rheological parameters is analyzed, and the problems and the errors caused when using the viscometer to measure the relevant parameters of the liquid and calculate the rheological parameters by using Newton’s liquid shear rate are pointed out. According to the constitutive equation of L-M liquid, the law of circumferential movement of the liquid in rotational viscometer and the calculation formula of shear rate are deduced. The relationship between L-M liquid shear rate and Newtonian liquid shear rate And rheological parameters, and put forward a set of accurate calculation of L-M liquid rheological parameters of the method.