bohrlochmeßverfahren to determine the azimuts of bohrlochverlaufes

摘要

The invention concerns a drillhole measurement method using a probe held by a cable, the angle of tilt of the longitudinal axis of the probe being measured by a two-axis inclinometer. The geographical direction of the inclination is determined by a rotatable magnetic-field sensor mounted to rotate about the longitudinal axis of the instrument, thus producing a signal induced by the Earth's local magnetic field. This signal is fed through a cable to the surface of the Earth where modern computer-based statistical methods are used to produce highly accurate results.