多绳摩擦提升系统井口相对位置的精确计算

Accurate calculation of wellhead relative position in multirope friction hoisting system

在确定多绳摩擦提升系统井口相对位置时,相关设计手册计算公式均存在着一定误差,尤其是钢丝绳上出绳角和下出绳角计算误差直接影响到摩擦轮围抱角的计算精度,进而影响到提升系统的防滑计算。此外,井口其它参数(弦长、弧长)的确定与提升系统选型计算中部分参数(如静张力等等)的精度密切相关。本文针对上述问题,给出了计算提升系统井口相对位置的精确公式,并应用平面解析几何知识,对围抱角计算公式进行了推导,提高了计算精度。

There are some errors in conforming wellhead relative position in muhirope friction hoisting system according to calculation formula provided by current relative design notebook. Especially, the calculation error of up - sending rope angle and down - sending rope angle will affect the calculation precision of friction wheel surrounding nourish angle. All above will affect the anti slippage calculation of hoisting system. In addition, the other parameters of wellhead such as chord length and arc length arc relative with some parameters like static tension during the calculation for hoisting system. Aiming the problems above, the accurate formula to calculation for wellhead relative position in multirope friction hoisting system is proposed. The calculation formulation for surrounding nourish angle is derived by according to the theory of plane analytic geometry and the calculation precision is improved.