碳纤维连续抽油杆冲程损失计算方法

碳纤维连续抽油杆的应用越来越广泛，但目前尚无专用于该类抽油杆冲程损失的计算方法，而用计算钢质抽油杆冲程损失的常规方法其误差很大，甚至常因计算误差太大而导致出现井下撞泵现象。通过对碳纤维连续抽油杆的材质进行分析，在考虑碳纤维连续抽油杆自身结构特征的基础上，结合作业温度变化对碳纤维复合材料与各种复合材料弹性模量的影响，并考虑到抽油杆振动所带来的影响，建立了适用于碳纤维连续抽油杆冲程损失的计算模型。计算实例表明，与常规计算方法相比，碳纤维连续抽油杆冲程损失计算模型的冲程损失计算结果误差由33.1%降至3.6%，完全满足现场对于冲程损失计算的精度要求。研究结果表明，建立的碳纤维连续抽油杆冲程损失计算模型可以解决碳纤维连续抽油杆应用中存在的冲程损失计算误差大、防冲距调整不精确的问题。 

Method for Calculation of Stroke Losses in Carbon Fiber Continuous Sucker Rods

Carbon fiber continuous sucker rods are used extensively,but there are no techniques currently available for calculations related to the stroke losses of such rods.Conventional methods deployed for stroke losses in steel rods are characterized by significant errors.In extreme cases,such errors may lead to downhole collisions.By analyzing the materials in the carbon fiber continuous sucker rods and taking into consideration the structural features,the as well as impacts of working temperatures over carbon fiber composite materials and relevant elastic modulus,an innovative model to calculate the stroke losses in carbon fiber continuous sucker rods was developed.The model took the impact of rod vibration into account.Calculation results showed errors in calculated stroke losses were reduced from 33.1% of the conventional method to the present level of 3.6%,which can effectively satisfy accuracy requirement related to calculating stroke losses.Research results indicated the innovative calculation model could effectively remove problems related to significant errors and inaccurate adjustment of stoke tolerances in stoke loss calculation in carbon fiber continuous sucker rods.