Relative drill bit direction measurement

Details Relative drill bit direction measurement Relative drill bit direction measurement

E - Fixed Constructions

21

B

E21B 47/022 (2006.01) E21B 47/024 (2006.01) G01B 7/31 (2006.01) E21B 7/04 (2006.01)

Patent

CA 2452120

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 (10) carrying a permanent magnet (50) and sensors (46) behind a drilling motor (16) 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 (50) and an oriented, three component alternating magnetic field sensor.

L'invention concerne un appareil et des procédés de détermination, à un emplacement distant, de la direction entre un champ magnétique tournant et des capteurs de champ magnétique alternatif. La courbure d'un assemblage de forage, entre un trépan en rotation (10) équipé d'un aimant permanent (50), et des capteurs (46) disposés derrière un moteur de forage (16) est mesurée afin de fournir une indication précoce de changements de la direction de forage. Une seconde application concerne la mesure de la convergence, de la divergence et de la l'obliquité de deux puits approximativement parallèles afin d'obtenir une information permettant de corriger la direction de forage dans le but de maintenir le parallélisme. Dans une troisième application, on mesure la direction et la distance à un point cible afin d'obtenir des données servant à guider le forage vers le point cible. L'appareil est constitué principalement d'un aimant permanent rotatif orienté (50) et d'un capteur de champ magnétique alternatif orienté, à trois composantes.

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