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《Progress in Geophysics》 2014-01
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Preliminary geo-steering method of directional electromagnetic wave resistivity logging-while-drilling tools

ZHANG Ke;WEI Bao-jun;CHANG Xin-li;College of Science in China University of Petroleum;  
The geo-sieering service provided by logging-whiledrilling technology is being more widely used with requirement of petroleum exploration and production being changed.In this article,the geo-sleering method of directional electromagnetic wave resistivity logging-while-drilling tools was studied using the magnetic-current-source dyadic Green ' s functions for horizontally stratified anisotropic media.The relative position between tool and formation boundary can be fixed by combining the orientation vector and the variation of directional geosignal,so as to eliminate the ambiguity,lower the probability of making wrong drilling decisions and place the borehole in optimal position.The orientation vector is derived from the receiver coil' s voltage and points to the conductive shoulder bed,in addition,a superposition method is applied to calculate Green' s functions in formation model with tilted boundary which is commonly encountered in underground scenarios.The information related to formation azimuth and dip can be obtained by using the azimuthal imaging of directional data,which is symmetrically compensated and free of influence exercised by formation anisotropy.Numerical results illustrate that the investigation depth and the contrast of image will increase with increasing coil spacing.The contrast of image will increase with increasing frequency and resistivity contrast between target bed and shoulder bed as well as dip angle,but the depth interval in which directional signals change significantly will narrow with increasing dip angle.The tool-toboundary distance can be estimated by interpolating real-time date into the crossplot of directional geosignal calculated by single boundary model.However,when shoulder bed resistivity is known prior to drilling,the application range of the crossplot made by two directional geosignais is severely limited,besides,the directional geosignais lost the sensitivity to tool-to-boundary distance when the transmitter coil and receiver coil are separated by formation boundary.It ' s necessary to develop some more powerful techniques to overcome the oversimplification of crossplot calculated by single boundary model and to deal with more complex underground structure better.The azimuth and distance of the boundary which has not been penetrated can be obtained by integrated utilization of above methods,and then according this,the well trajectory can be adjusted in realtime to achieve optimal wellbore placement.These conclusions provide reference to the geo-steering method of directional electromagnetic wave resistivity logging-whiie-drilling tools.
【Fund】: 教育部新世纪优秀人才支持计划(NCET-10-0767)资助
【CateGory Index】: P631.811
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