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A Long-Term Performance Enhancement Method for FOG-Based Measurement While Drilling.

Chunxi Zhang1, Tie Lin2

  • 1School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China. zhangchunxi@buaa.edu.cn.

Sensors (Basel, Switzerland)
|August 3, 2016
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Summary

This study introduces a new fiber optic gyroscope (FOG) based measurement-while-drilling (MWD) system for the oil industry. The novel system offers improved accuracy and efficiency for downhole position and orientation surveying compared to traditional methods.

Keywords:
Kalman filterfiber optic gyroscope (FOG)inertial navigation system (INS)measurement while drilling (MWD)minimum curvature method (MCM)

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Area of Science:

  • Geophysics
  • Petroleum Engineering
  • Sensor Technology

Background:

  • Traditional magnetic surveying in Measurement-While-Drilling (MWD) systems suffers from magnetic interference, limiting performance.
  • Accurate real-time position and orientation of the bottom hole assembly (BHA) are crucial for efficient drilling operations.

Purpose of the Study:

  • To develop and validate a novel MWD surveying system utilizing a fiber optic gyroscope (FOG) to overcome magnetic interference issues.
  • To enhance long-term, high-precision position and orientation surveying capabilities for downhole drilling conditions.

Main Methods:

  • A new compact design method for downhole MWD systems was adopted.
  • An integrated surveying algorithm combining an inertial navigation system (INS) with drilling features was developed.
  • A FOG-based MWD error model was established, and Kalman filter state-space models were constructed.

Main Results:

  • Semi-physical simulations demonstrated the algorithm's effectiveness in suppressing errors.
  • The proposed FOG-based MWD system achieved superior measurement precision compared to traditional algorithms.
  • The new method significantly reduced surveying time compared to the zero velocity update (ZUPT) method.

Conclusions:

  • The developed FOG-based MWD system provides a viable and more accurate alternative to magnetic surveying systems.
  • The integrated surveying algorithm effectively improves position and orientation accuracy in challenging downhole environments.
  • This approach offers a more efficient and precise solution for MWD applications in the oil industry.