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- Title
随钻伽马对方位角测量的影响及校正方法研究.
- Authors
蒋必辞; 田小超; 张 鹏; 汲方林; 丛 琳; 王 盼
- Abstract
In order to adjust the trajectory of the directional drilling according to the geological conditions in the coal mine, a gamma logging while drilling tool for mine is designed that integrates the natural radioactivity of the formation and the trajectory measurement. In order to eliminate the influence of the gamma detector on the azimuth angle of the trajectory measurement, starting from the basic principle of trajectory measurement, the influence characteristics of the gamma detector on the azimuth angle measurement are analyzed using finite element analysis and standard turntable testing, and the generalized regression neural network (GRNN ) A correction model for the influence of azimuth is established. The gamma detector has a certain effect on the distribution of the magnetic field around the inclinometer sensor, and has different effects on the three different direction components of the magnetic field. When the inclination and azimuth of the instrument are different, the degree of magnetic influence is also different, which in turn affects the measurement accuracy of the azimuth; after addition of gamma rear inclinometer sensor probe, the maximum increases the azimuth error of 0.4 °; Effect With azimuth correction GRNN model established azimuth angle mean square error decreased from 0.677 8 ° to 10 × 5.11-29 °. The GRNN calibration model has high accuracy, and it can eliminate the influence of the gamma detector on the azimuth angle of the inclinometer sensor. A correction method based on theoretical analysis, forward simulation, experimental testing, and GRNN correction model of the gamma detector's influence on the trajectory measurement azimuth angle is formed, which provides a reference for studying the influence of other logging sensors on the trajectory measurement.
- Subjects
NATURAL radioactivity; DIRECTIONAL drilling; TRAJECTORY measurements; MAGNETIC field effects; FINITE element method; MEASUREMENT errors; LOGGING equipment; GAMMA ray spectrometry
- Publication
Coal Science & Technology (0253-2336), 2020, Vol 48, Issue 12, p175
- ISSN
0253-2336
- Publication type
Article
- DOI
10.13199/j.cnki.cst.2020.12.022