Rheological and yield stress measurements of non-Newtonian fluids using a Marsh Funnel
Rheological and yield stress measurements of non-Newtonian fluids using a Marsh Funnel
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DOI：
10.1016/j.petrol.2011.04.008
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发表时间：
2011-06-01
影响因子：
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通讯作者：
Calderin, Jennifer M.
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文献类型：
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作者：
Balhoff, Matthew T.;Lake, Larry W.;Calderin, Jennifer M.
准确而简单的流体流变特性测量技术对于石油工业的现场作业非常重要，但现有方法相对昂贵且结果可能是主观的。对于流体屈服应力的测量尤其如此，众所周知，这是很难获得的。马什漏斗是钻井液领域常用的质量控制工具，它们提供了一种简单、实用的粘度测量替代方案。在正常测量中，使用单点（排水时间）来确定平均粘度；关于流体的非牛顿行为，提取的附加信息很少。这里，开发了一种新模型，并使用从马什漏斗收集的流体体积数据作为时间的函数来确定钻井泥浆和其他非牛顿流体的流变特性。粘度和剪切稀化指数的漏斗结果与常用 Fann 35 粘度计获得的值相当。更重要的是，引入了一种用于确定屈服应力的客观静态方法，与用于流变仪数据的动态外推技术相比，该方法具有多个优点。由 Elsevier B.V. 出版
Accurate and simple techniques for measurement of fluid rheological properties are important for field operations in the oil industry, but existing methods are relatively expensive and the results can be subjective. This is particularly true for measurements of fluid yield stress, which are notoriously difficult to obtain. Marsh Funnels are popular quality-control tools used in the field for drilling fluids and they offer a simple, practical alternative to viscosity measurement. In the normal measurements, a single point (drainage time) is used to determine an average viscosity; little additional information is extracted regarding the non-Newtonian behavior of the fluid.Here, a new model is developed and used to determine the rheological properties of drilling muds and other non-Newtonian fluids using data of fluid volume collected from a Marsh Funnel as a function of time. The funnel results for viscosity and shear-thinning index compare favorably to the values obtained from a commonly-used Fann 35 viscometer. More importantly, an objective, static method for determining yield stress is introduced, which has several advantages over dynamic, extrapolation techniques used for rheometer data. Published by Elsevier B.V.