Variation law of wellhead back pressure under well control during variable gradient managed pressure drilling
Wang Jiangshuai, Li Jun, He Yanfeng, Liu Gonghui, Deng Song, Yang Hongwei, Song Xuefeng, Yang Qing, Xia Shunlei
Acta Petrolei Sinica . 2021, (11): 1499 -1505 .  DOI: 10.7623/syxb202111009

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