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专利名称：Method for determining the azimuth of a
borehole
发明人：Van Dongen, Johannes Cornelis
Maria,Maekiaho, Leo Bernhard
申请号：EP86200212.8申请日：19860213公开号：EP0193230B1公开日：19900314
摘要：The influence of drill string magnetization on an azimuth measurement in aborehole by means of a magnetometer package included in a drill string having alongitudinal axis is eliminated byfirst eliminating the influence of the cross-axial
components of the drill string magnetization through magnetometer readings at variousangular orientations of the drill string, and then eliminating the influence of the axialcomponent of the drill string magnetization
申请人：SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
代理机构：Aalbers, Onno
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