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<p>This paper presents a downhole instrument that leverages a dual-position north-seeking technique to achieve high-precision six-degree-of-freedom (6-DoF) navigation in borehole environments where external positioning signals are unavailable. The instrument integrates a MEMS-based inertial measurement unit (IMU) with a single-axis optical gyroscope, together with multiple environmental sensors, forming a compact multi-parameter measurement tool. Through a two-orientation azimuth determination method, the system mitigates gyroscope bias and resolves heading ambiguity. We reformulate the theoretical basis of this dual-position gyrocompassing approach and embed it within the instrument’s sensor-fusion architecture to continuously estimate borehole attitude—inclination, azimuth, and toolface—together with incremental displacement in real time. Analytical modeling, simulation, and laboratory experiments confirm robust and accurate north-seeking performance: after calibration, azimuth errors are typically.</p>

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Design and Experimental Validation of a Dual-Position East–West North-Seeking Downhole Multi-Parameter Tool Using a Hybrid MEMS-IMU and Single-Axis Fiber-Optic Gyroscope

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Liangzhu Yan,
  • Yahang Zhou,
  • Youyan Jian,
  • Zhiyuan Zhou,
  • Qiao Liu

摘要

This paper presents a downhole instrument that leverages a dual-position north-seeking technique to achieve high-precision six-degree-of-freedom (6-DoF) navigation in borehole environments where external positioning signals are unavailable. The instrument integrates a MEMS-based inertial measurement unit (IMU) with a single-axis optical gyroscope, together with multiple environmental sensors, forming a compact multi-parameter measurement tool. Through a two-orientation azimuth determination method, the system mitigates gyroscope bias and resolves heading ambiguity. We reformulate the theoretical basis of this dual-position gyrocompassing approach and embed it within the instrument’s sensor-fusion architecture to continuously estimate borehole attitude—inclination, azimuth, and toolface—together with incremental displacement in real time. Analytical modeling, simulation, and laboratory experiments confirm robust and accurate north-seeking performance: after calibration, azimuth errors are typically.