Numerical simulation of helical annular flow between pumping rod and tubing in surface-driven progressing cavity pump well
Wu Xiaodong, Lü Yanping, Gao Shi'an, Miao Guojing
Editorial office of ACTA PETROLEI SINICA . 2007, (2): 133 -136 .  DOI: 10.7623/syxb200206028

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