全金属螺杆泵机械特性与节能分析

Mechanical characteristics and energy saving of all metal progressing cavity pumps

郑磊 吴晓东 韩国庆 张恒 朱志勇 王晗路 2

中国石油大学（北京）石油工程教育部重点实验室，北京 102249 中国石油大学￣盐城世宏石油装备有限公司采油装备联合研究中心，北京 102249

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China Oil Production Equipment Joint Research Center, Yancheng Shihong Petroleum Equipment Co., Ltd., China University of Petroleum, Beijing 102249, China

全金属螺杆泵在定转子间隙配合状态下工作，其机械特性与传统过盈配合螺杆泵存在明显差异。基于重载、空载特性实验，提出了全金属螺杆泵负载扭矩的经验计算方法，分析了不同条件下全金属螺杆泵的机械性能及节能效果。研究表明：全金属螺杆泵工作过程中，泵内摩擦扭矩随着工作压差、转速的增大呈线性递增趋势，且存在由泵自身结构决定的极限机械效率；工作压差越小、转速越高、介质黏度越大，越有利于泵排液，但是对泵的机械性能产生不利影响，实际应用中需综合考虑。相比于传统螺杆泵，不同工作条件下全金属螺杆泵的节电率总体超过20%，具有较大的节能潜力。

All metal progressing cavity pump(PCP) operates with the stator and rotor in clearance fit, which makes its mechanical characteristics significantly different from the traditional PCP. For this reason, the empirical method of calculating the load torque of all metal PCP was proposed on the basis of the pump experiments under heavy load and no load conditions. Then the mechanical characteristics and the energy-saving effect were analyzed under different conditions. The results show that during the operation of all metal PCP, the friction torque inside the pump increases linearly as the differential pressure and rotational speed increase, which has a critical mechanical efficiency simply depending on the pump structure; smaller differential pressure, higher rotational speed and higher fluid viscosity favor the artificial lift capacity, but they have adverse effects on the mechanical efficiency. Therefore, these conditions should be synthetically considered in practical pump applications. Compared with the traditional PCP, all metal PCP can save the power generally above 20% in different operating conditions, showing great energy saving potential.

10.6056/dkyqt201805030