螺杆钻具转子表面磨损规律研究

Analysis on the Rotor Surface Wear of Screw Drill Motor

摘要:

转子是螺杆钻具的核心部件，与定子相配合，决定了螺杆钻具的工作效率和动力性能。主要研究不同泥浆固相含量和添加剂对螺杆钻具转子表面磨损的影响，并设计了专用试验装置以模拟近井下条件工作时螺杆钻具转子的表面磨损情况，对其磨损规律开展研究，探索了转子在不同泥浆条件下的磨损规律，并结合相关磨损机理进行了进一步分析。初步发现了对硬铬镀层损伤较大的因素是泥浆固相与盐类添加剂，进而确定了硬铬镀层磨损的主要形式是腐蚀磨损，从而形成了对转子的制造工艺及使用方法的有益建议。

Abstract:

The heart of the screw drill (also called positive displacement motor, PDM) is the rotor, it decides the work efficiency and performance of the screw drill. In this paper, the influence of different slurry solid content and additive on rotor surface wear was studied, and a special testing set was made to stimulate the rotor surface wearing rule under real downhole working conditions. The rotor wear regularity under different mud conditions was explored, which was further studied. It is found that the solid particle and salty additives are the main reasons for hard chromium coating damage and identifies that the main form of hard chromium coating damage is corrosive wear. Some suggestions are presented to the rotor manufacturing process and the application.