导向头动态测量磁干扰校正方法及其应用

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关键词：旋转导向；磁干扰；导向头；方位角校正；磁通门；机器学习算法中图分类号：TE242文献标识码：A DOI：10.12473/CPM.202408005

Magnetic Interference Correction Method forDynamic Measurementof Steering Head andIts Application

Zhu JinsongSong XiaojianYu Yanfei Zhang SuoshengJiang QihongZheng BangxianChen Jingwang （Directional Drilling Technology ServiceCompany，CNPC Bohai Drilling Engineering Company Limited）

Abstract：During the operation of the rotary steering system，the magnetic interference faced by the steering head when performing dynamic measurement tasks mainly comes from two aspects：one is the magnetic influence of the internal currentfluctuationof the M3O bus，and the other is the external magnetic interference inthe real-time environmentof the driling operation.Specifically，when the current intensityof the M3O bus is greater than1A， an interference magnetic field willbe generated，which directlychallenges the magnetic measurement accuracyof the steering head.Meanwhile，the elements such as bitand mudflow involved indrilingfurther aggravate the degree of magnetic interference，which not only significantly reduces the magnetic measurement accuracy of the stering head，but also may mislead the judgment of the azimuth gamma and resistivity imaging areas，leading to engineering errors.To addresstheabove problems，amagnetic interferencecorrection scheme for the steering head was innovatively proposed.First，magnetic interference regressionanalysis was conducted on the current of the M30 bus.Then，by means of integrating atitude measurement principles with multi-point analysis techniques，the single-point correction and the multi-point correction model optimized by an adaptive genetic algorithm were creatively applied to conduct deep and precisecalibrationon the three-axis fluxgatesensor.Analysis on the data obtained after application in DengX wellshows that this method reduces the dynamic magnetic measurement azimuth angle error of the rotary steering system by 85% . Further application in multiple well clusters in Huabei Oilfieldand Changqing Oilfield shows that the azimuth angle consistency of static magnetic measurement is improved by 13% . These application practices prove the effectiveness of the magnetic interference correction method in significantly improving the dynamic magnetic measurement accuracy of rotary steering.

Keywords：rotary steering；magnetic interference；steering head；azimuth correction；fluxgate；machin（ learning algorithm

0 引言

导向头作为旋转导向的核心部件，承担着近钻头测量的任务。（剩余12683字）