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1. 发明申请

US20210108502A1 IN-SITU DOWNHOLE MEASUREMENT CORRECTION AND CONTROL 有权
公开(公告)号：US20210108502A1
公开(公告)日：2021-04-15
申请号：US17129535
申请日：2020-12-21
申请人： Scientific Drilling International, Inc.
发明人： Timothy WHITACRE , Matthew A. White , Pong PIPATWIT
IPC分类号： E21B44/00 , G01V3/26 , E21B47/024 , E21B7/06 , G01V3/38
摘要： A method includes providing a Bottom Hole Assembly (BHA) in a wellbore. The BHA includes a rotary steerable system and a downhole attitude correction and control system. The downhole correction and control system includes a first sensor set, the sensors of the first sensor set positioned near ferromagnetic components of a drill string and a second sensor set, the sensors of the second sensor set positioned further from the ferromagnetic components of the drill string than the sensors of the first sensor set. Corrupted data from the first sensor set and reference data from the second sensor set is obtained, the corrupted data including cross-axis magnetometer and accelerometer measurements. The method additionally includes correcting the corrupted sensor data to form corrected sensor measurements and calculating an estimated azimuth from the corrected sensor measurements. The method further includes steering the rotary steerable system based on the estimated azimuth.

2. 发明申请

US20190353023A1 IN-SITU DOWNHOLE MEASUREMENT CORRECTION AND CONTROL 审中-公开
公开(公告)号：US20190353023A1
公开(公告)日：2019-11-21
申请号：US16416185
申请日：2019-05-18
申请人： Scientific Drilling International, Inc.
发明人： Timothy WHITACRE , Matthew A. White , Pong PIPATWIT
IPC分类号： E21B44/00 , G01V3/26 , G01V3/38 , E21B7/06 , E21B47/024
摘要： A method includes providing a Bottom Hole Assembly (BHA) in a wellbore. The BHA includes a rotary steerable system and a downhole attitude correction and control system. The downhole correction and control system includes a first sensor set, the sensors of the first sensor set positioned near ferromagnetic components of a drill string and a second sensor set, the sensors of the second sensor set positioned further from the ferromagnetic components of the drill string than the sensors of the first sensor set. The downhole correction and control system also includes a RSS controller operatively coupled to and adapted to receive measurements from the first and second sensor sets, the controller in data communication with the rotary steerable system. Corrupted data from the first sensor set and reference data from the second sensor set is obtained, the corrupted data including cross-axis magnetometer and accelerometer measurements. In addition, the method includes depth aligning the corrupted sensor data and the reference data and calculating twist misalignment between the cross-axis magnetometer and accelerometer measurements of the corrupted sensor data to obtain a bias estimate. The method further includes calculating an estimated z axis magnetic scale factor and bias of the first sensor set and calculating a cross-axis magnetic scale factor of the corrupted sensor data. The method additionally includes correcting the corrupted sensor data to form corrected sensor measurements and calculating an estimated azimuth from the corrected sensor measurements. The method further includes steering the rotary steerable system based on the estimated azimuth.

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