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《Journal of Daqing Petroleum Institute》 1988-03
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Wang Shan;Daqing Drilling Institute  
The key elements of the survey steering tool (SST) are the magnetic -flux-gate transducer and the gravity sensor. In this paper, a primitive description is given, we hope to discuss this with our colleagues. Although SST has been widely used in the directional drilling, not all its users know how the magnetic-flux-gate transducer works. According to electromagnetic principle, there will be a secondary harmonic wave distor. tion in the transducer as a result of the action of the earth magnetic field- This would in turn produce an induced voltage, which is proportional to the magnetic field as well as the cosine of the angle between field and the axis of the magnetic flux.
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1 DU Liangfa1,2,WANG Shaobing(1.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083;2.Shandong Zhengyuan Geographical Information Engineering Co.Ltd., Shandong Bureau of China Metallurgical Geology Bureau,Jinan Shandong 250014);Discussion on Coherence Check of the Metal Pipe and Cable Locators in General Survey of Underground Pipeline in City[J];Journal of North China Institute of Science and Technology;2008-02
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