Submersible direct-drive progressing cavity pump rodless lifting technology
HAO Zhongxian,ZHU Shijia,PEI Xiaohan,HUANG Peng,TONG Zheng,WANG Benyuan,LI Deyin
Petroleum Exploration & Development . 2019, (3): 621 -628 .  DOI: 10.1016/S1876-3804(19)60042-X

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