frictional drag

Frictional drag produced by piston o& ring

O型活塞密封圈所产生的摩擦阻力

The rule of hook load and friction coefficient is applied to enhance predictive accuracy of frictional drag in new area or different BHAs and heighten utilization ratio of frictional drag. Drag theory can be combined with practice, and drill string mechanics analysis system is supplemented.

利用钩载和摩阻系数的规律性，能够提高新区块或者不同钻具组合摩阻预测的准确性，增强现场施工摩阻的利用率，达到理论结合实际，丰富完善钻柱力学分析体系的目的。

study on skin frictional drag of fibre in coagulation bath and its application in dry-wet spinning method

凝固浴对丝条的摩擦阻力公式及其在干湿法纺丝中的应用

Method to Increase the Accuracy of Measuring Lost Circulation Position Using Annular Frictional Drag

提高环空摩阻法测量井漏位置精度的方法