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《Well Logging Technology》 2010-02
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On Electromagnetic Logging Technology in Cased Hole and Its Casing Influence

SONG Xijin1,DANG Reirong1,DONG Zhao2(1.Key Laboratory of Photoelectric Logging and Detecting of Oil and Gas,Ministry of Education,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;2.NO.1 Oil Production Plant,Changqing Oilfield Company,Yan'an,Shaanxi 716000,China)  
By calculating the electromagnetic field response of the receiver loop in the case of transmit coil and receiving coil with axial arrangements,the maximum transmitting frequency is determined and the rule of the influence of casing thickness,magnetic permeability and electrical conductivity is studied.The numerical results show that when the frequency of emission current is higher than 200 Hz,the electromagnetic field is almost absorbed by the casing,therefore electromagnetic signals can not pass through the casing into the formation.When the casing thickness is in the range of 4 ~ 7 mm,the received signal has greater amplitude.Furthermore,the higher the casing relative magnetic permeability,the lower the amplitude of received signal.This study can provide a theoretical basis for log interpretation and instrument development in general well or cased hole.
【Fund】: 国家863项目(2007AA06Z217)
【CateGory Index】: P631.811
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