MEMS-based downhole tool incorporated in mobile inclinometric station for trajectory survey of grouped wellbores
Tóm tắt
The paper proposes and analyzes the technical solutions developed for a principally new downhole tool not containing navigation grade gyros to be used within a mobile inclinometric station. MEMS inertial sensors are selected using comparative analysis of their instrumental errors and desired accuracies, and methodical errors of the proposed gyroscopic algorithm. The gyroinclinometer needs no initial alignment by gyrocompassing, instead, initial alignment in local frame is proposed. A criterion to select the reference frame is elaborated by minimizing the errors of relative positioning of well tops. Results from the station bed tests are presented. Wellbore trajectory measurements using ADXRS150 MEMS gyros by Analog Devices and Eptron gyros by Elektropribor are comparatively estimated.
Tài liệu tham khảo
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