Signal Processing in Logging While Drilling

Xue, Qilong

doi:10.1007/978-3-030-34035-3_7

Cited by 1 publication

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References 6 publications

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“…The posture of the drill string constantly changes over time due to the various stress conditions of the bottom hole assembly (BHA). For the measurement of gamma imaging, neutron density, and electromagnetic resistivity, the eccentricity distance has a great influence on the measurement results [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. In order to obtain the real formation information accurately, modified maps of the sensors with different eccentricity distances are given.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

2021

Sensors

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The drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging measurement sensor while drilling (IMWD). This paper proposes a method for measuring eccentricity while drilling using two sets of caliper sensors coupled with a fiber-optic gyroscope for continuous attitude measurement, which is used to solve the problem of the quantitative measurement of complex eccentricity that changes in real-time downhole. According to the measurement and calculation methods involved in this article, we performed simulations of the attitude of the drill string near where the IMWD tool is located in the wellbore under a variety of complex downhole conditions, such as centering, eccentricity, tilt, buckling, rotation, revolution, etc. The simulation and field test results prove that the distance between the imaging while drilling sensor and the borehole wall is greatly affected by the downhole attitude and revolution. The multi-sensor layout measurement scheme and the data processing based on the above-mentioned measurement involved can push the drill collar movement and eccentricity matrix specifically studied downhole from only qualitative estimation to real-time measurement and quantitative calculation. The above measurement and data processing methods can accurately measure and identify the local operating posture of the drill string where the IMWD sensor is located, and quantitatively give the eccentric distance matrix from the measuring point to the borehole wall required for environmental correction of the IMWD sensor.

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Section: Introductionmentioning

confidence: 99%

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

Wang

2021

Sensors

View full text Add to dashboard Cite

show abstract

Signal Processing in Logging While Drilling

Cited by 1 publication

References 6 publications

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

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

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