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1. (WO2018182870) ADAPTIVE DOWNHOLE INERTIAL MEASUREMENT UNIT CALIBRATION METHOD AND APPARATUS FOR AUTONOMOUS WELLBORE DRILLING

Pub. No.:    WO/2018/182870    International Application No.:    PCT/US2018/018402
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Feb 16 00:59:59 CET 2018
IPC: G01C 25/00
G01D 18/00
E21B 7/00
Applicants: HRL LABORATORIES, LLC
Inventors: KABAKIAN, Adour, V.
WANG, Shuoqin
SORENSON, Logan, D.
NGUYEN, Hung
PERAHIA, Raviv
Title: ADAPTIVE DOWNHOLE INERTIAL MEASUREMENT UNIT CALIBRATION METHOD AND APPARATUS FOR AUTONOMOUS WELLBORE DRILLING
Abstract:
Described is a system for adaptive calibration of a sensor of an inertial measurement unit. Following each sensor measurement, the system performs automatic calibration of a multi-axis sensor. A reliability of a current calibration is assessed. If the current calibration is reliable, then bias and scale factor values are updated according to the most recent sensor measurement, resulting in updated bias and scale factor values. If the current calibration is not reliable, then previous bias and scale factor values are used. The system causes automatic calibration of the multi-axis sensor using either the updated or previous bias and scale factor values.