摘要
全金属螺杆泵的定子与转子采取间隙配合方式,其间隙漏失规律无法沿用传统过盈配合螺杆泵的方法予以分析。基于间隙配合方式下螺杆泵腔室间的漏失机理,借鉴线接触润滑理论计算漏失间隙结构参数,应用缝隙流动原理建立了综合考虑不同漏失方向的压差—剪切流动漏失模型。通过模型计算结果与室内实验数据的对比,验证了间隙漏失模型的准确性。研究表明,特定结构全金属螺杆泵的排量特性主要受压差漏失的影响,剪切漏失影响甚微;工作压差越大,转速、介质黏度越小,间隙漏失对排量的影响越严重;全金属螺杆泵更适用于介质黏度较高的油井举升,实际应用中可通过合理选择泵级数、转速等途径保证其举升性能。
The clearance fit mode between the stator and rotor is adopted for an all metal progressive cavity pump （PCP）. The laws of the clearance leakage cannot be analyzed by referring to the methods of the traditional PCP in interference fit. Based on the leakage mechanisms between cavities inside the PCP in clearance fit, the leakage structure parameters are calculated according to the line contact lubrication theory, and then the Poiseuille-Couette leakage model is established with the application of clearance flow principles considering different leakage directions synthetically. By comparison between the model results and experimental laboratory data, the accuracy of the leakage model is verified. The results show that the displacement performance of an all metal PCP with a specific structure is mainly affected by Poiseuille leakage flow, and the effects of the Couette leakage flow is very small; With an increase in the working pressure difference and a decrease in the rotational speed and fluid viscosity, the effects of the clearance slippage on the pump displacement become more significant. An all metal PCP is more suitable for well production of viscous fluid. In actual field applications, better working performance can be assured by means of appropriately adapting the pump stages and the rotational speed.
作者
郑磊
吴晓东
韩国庆
徐军
史殊哲
李准
ZHENG Lei;WU Xiaodong;HAN Guoqing;XU Jun;SHI Shuzhe;LI Zhun(MOE Key Laboratory of Petroleum Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Oil Production Equipment Joint Research Center of China University of Petroleum ＆ Yancheng Shihong Petroleum Equipment Co.Ltd.,Beijing 102249,China;Yancheng Shihong Petroleum Equipment Co.Ltd.,Yancheng 224500,China)
出处
《石油科学通报》
2018年第3期320-331,共12页
Petroleum Science Bulletin
基金
国家自然科学基金资助项目(51574256)
国家重点基础研究发展计划("973"计划)(2015CB250900)联合资助
