隨鉆前探技術(shù)現(xiàn)狀及其發(fā)展趨勢

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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

隨鉆測井技術(shù)（LoggingWhileDrilling，LWD）是一種在鉆井過程中通過將測量儀器集成于鉆具中進(jìn)行作業(yè)的技術(shù)，能夠執(zhí)行傳統(tǒng)電纜測井作業(yè)，同時具備將數(shù)據(jù)即時傳回地面的能力[1]。（剩余13392字）