发明名称 Method and apparatus for directly controlling pressure and position associated with an adjustable choke apparatus
摘要 A hybrid choke control system wherein the traditional choke experience is manifest in auditory and visual feedback mechanisms which are emulated by a digital control system enabling direct control of either position or back pressure associated with an adjustable choke device. The present invention enhances safety and efficiency when used in association with oil field drilling operations and in particular when applied to a device which provides the user with enhanced control capabilities for direction controlling the back pressure and position associated with drilling chokes during down hole operations.
申请公布号 US2004144565(A1) 申请公布日期 2004.07.29
申请号 US20030353650 申请日期 2003.01.29
申请人 VARCO INTERNATIONAL, INC. 发明人 KOEDERITZ WILLIAM L.
分类号 E21B21/08;(IPC1-7):E21B21/08 主分类号 E21B21/08
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