Wellbore circulating valve
作者： Gary Q. Wray , John C. Holden
DOI:
关键词: Engineering 、 Wellbore 、 Mandrel 、 Control equipment 、 Annulus (oil well) 、 Petroleum engineering
摘要: A wellbore circulating valve especially useful in a string of testing tools utilizes sequentially ratcheted inner mandrel which covers series flow ports and is opened by predetermined sequence operations move the away from thereby communicating annulus with bore tool.
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