In some common textbooks or reference books concerning on polymer rheology, the concept of true viscosity of non-Newtonian fluid is explained unclear, and parts of the calculation results are wrong.
在现有的有关聚合物流变学的教科书或辅导书中，对非牛顿流体中“真实黏度”的概念解释不清，部分内容计算上有误。
The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging, and by this way apparent porosity is lower than the true value.
低密度井眼流体会对补偿中子孔隙度测井产生井眼挖掘效应，使视孔隙度值低于真孔隙度，且井眼流体密度越小，井眼尺寸越大，地层孔隙度越大，井眼挖掘效应越明显。
The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging, and by this way apparent porosity is lower than the true value.
低密度井眼流体会对补偿中子孔隙度测井产生井眼挖掘效应，使视孔隙度值低于真孔隙度，且井眼流体密度越小，井眼尺寸越大，地层孔隙度越大，井眼挖掘效应越明显。
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