The calculation results demonstrate the effective eccentricity and the lifting force of the upper drill string are the major influential factors. 計算結果表明，有效偏心距和上部鉆柱的提升力是影響近井口套管偏磨的主要因素。
The fit-lost condition in gear mesh is analysed, and the relationship between tooth drum guantity of Klingelnberg Spiral bevel gear sysytem and tooth plate eccentricity is derived. 分析了齒輪副嚙合中的失配現象，并推導了克林貝格螺旋錐齒輪副輪齒的鼓形量與刀盤(pán)偏心距之間的關(guān)系。
