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Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout.

Hongqiang Li1,2, Ruihe Wang1

  • 1School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China.

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Summary
This summary is machine-generated.

This study introduces a new method using caliper sensors and a fiber-optic gyroscope to accurately measure drill string eccentricity and attitude downhole. This enables real-time, quantitative analysis of complex downhole conditions for improved drilling safety and sensor correction.

Keywords:
drill string dynamicsdrill string eccentricityfiber-optic gyroimaging measurementlogging while drillingmulti-sensor combinationultrasonic caliper while drilling

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Area of Science:

  • Geological Engineering
  • Drilling Technology
  • Sensor Technology

Background:

  • Drill string motion downhole is complex, impacting drilling safety and sensor accuracy.
  • Operating attitude and eccentricity are critical parameters for real-time downhole operations.

Purpose of the Study:

  • To develop a quantitative method for measuring complex, real-time drill string eccentricity and attitude.
  • To improve the accuracy of imaging measurement while drilling (IMWD) sensors through environmental correction.

Main Methods:

  • Utilized two sets of caliper sensors and a fiber-optic gyroscope for continuous attitude measurement.
  • Performed simulations under various downhole conditions (centering, tilt, buckling, rotation, revolution).
  • Developed a multi-sensor layout and data processing scheme for quantitative analysis.

Main Results:

  • Confirmed that downhole attitude and revolution significantly affect the distance between the IMWD sensor and the borehole wall.
  • Successfully transitioned drill collar movement and eccentricity assessment from qualitative to quantitative real-time measurement.
  • Demonstrated accurate measurement and identification of drill string posture and eccentric distance matrix.

Conclusions:

  • The proposed method accurately measures drill string operating posture and eccentricity downhole.
  • This enables precise environmental correction for IMWD sensors, enhancing drilling data reliability.
  • The technique facilitates real-time, quantitative assessment of critical downhole parameters.