随钻前探技术现状及其发展趋势
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Current StatusandDevelopment TrendofLook-Ahead While Drilling Technology
Yan Sen 1，2 Gao Wenkai²Zhang Xiaohui³Wang JiajinZhang Chunhua²Jia Hengtian²Cao Chong² （1.PetroChinaResearch Instituteof PetroleumExploration&Development;；2.CNPCEngineering TechnologyR&DCompanyLim ited;3.CNPC Daqing Drilling Engineering Company）
Abstract：Asone ofthe key emerging technologies in the fieldof logging while drilling （LWD），the lookahead wiledrilling（LAWD）technologycan perform real-time detection on undrilled formation in frontof the bit， effctively reducing therisk of drilling accidents and improving drilling efficiency.In this paper，theLAWD technology was clasified，the working principles of electromagnetic LAWD，acoustic LAWDand seismic LAWD were introduced，and their respective advantages and disadvantages were compared.The development history of LAWD toolsand instruments was brieflydescribed，andtheir application was analyzed.Moreover，itis indicated that the fusionof multiple methods is a key trendof LAWD technology in the future.Finally，the folowing suggestions are put forward：（1） the electromagnetic LAWD technology should develop towards multi-frequency and multi-spacing measurement mode；（2） the research on the phased array acoustic LAWD theoryand technology should be strengthened，or the technology such as enhancing the look-ahead acoustic wave energyby pre-positioning the ultrasonic transducer should be explored to laya technical foundation forthe developmentof subsequent acoustic LAWD instruments；and（3）the research and development of VSPwhile driling technology，including the development of high-accuracy sensors and the exploration of using downhole vibroseis to replace drill-bit source should be increased，so as to overcome the problem of PDC bit source.The research results provide technical support for the efficient and safe development of oil and gas resources in China.
Keywords： LAWD;LWD； seismic while drilling; electromagnetic wave;acoustic LAWD； stratigraphic prediction; phased array
0 引言
随钻测井技术（LoggingWhileDrilling，LWD）是一种在钻井过程中通过将测量仪器集成于钻具中进行作业的技术，能够执行传统电缆测井作业，同时具备将数据即时传回地面的能力[1]。（剩余13392字）