<p>Apparatus and Methods are disclosed for determining the direction between a rotating magnetic field and alternating magnetic field sensors at a remote location. The curvature of a borehole drilling assembly between a rotating drill bit carrying a permanent magnet and sensors behind a drilling motor is measured to provide early indication of changes in drilling direction. A second application concerns measurement of the convergence and divergence and the skewness of two approximately parallel well bores to provide information for correcting the drilling direction to maintain parallelism. A third application measures the direction and distance to a point target to provide data for guiding drilling toward that target. The primary apparatus are an oriented, rotating permanent magnet and an oriented, three component alternating magnetic field sensor.</p>
申请公布号
EP1442320(B1)
申请公布日期
2014.04.23
申请号
EP20020747945
申请日期
2002.07.10
申请人
HALLIBURTON ENERGY SERVICES, INC.
发明人
KUCKES, ARTHUR, F.;PITZER, RAHN, G.;NEKUT, ANTHONY, G.