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《Journal of Jilin University(Earth Science Edition)》 2009-02
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Improving Compensated Neutron Log Vertical Resolution Under Deviated and Horizontal Well Conditions and Its Application

YU Hua-wei1,SUN Jian-meng1,LAI Fu-qiang1,WANG Min1,YANG Jin-zhou21.College of Geo-Resources and Information,China University of Petroleum,Dongying,Shandong 257061,China2.Drilling Technology Research Institute,Shengli Oilfield Company,Dongying,Shandong 257000,China  
In order to reasonably improve the vertical resolution of the compensated neutron log(CNL) in deviated and horizontal well,Monte Carlo simulation was applied to study the vertical geometrical factors of CN241 tool in the well of different deviation angle.The geometrical factor was regarded as response function coefficient,and resolution matching method was used to improve the resolution of the log curves in simulated formation and true formation.The vertical geometrical factors obtained from the simulation data proved that there would be some error when the geometrical factor of vertical well was applied to deviated or horizontal well,and the maximum porosity error could be as high as 10% when the formation thickness is 40 cm.The results also showed that geometrical factors were different with different deviation angles,therefore the corresponding geometrical factor should be used as response function coefficient when to improve CNL resolution of deviated or horizontal well.
【Fund】: 国家“863”项目(2006AA060105)
【CateGory Index】: P631.81
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