Control method for downhole steering tool

Details Control method for downhole steering tool Control method for downhole steering tool

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2509585

A method for determining a rate of change of longitudinal direction of a subterranean borehole is provided. The method includes positioning a downhole tool in a borehole, the tool including first and second surveying devices disposed thereon. The method further includes causing the surveying devices to measure a longitudinal direction of the borehole at first and second longitudinal positions and processing the longitudinal directions of the borehole at the first and second positions to determine the rate of change of longitudinal direction of the borehole between the first and second positions. The method may further include processing the measured rate of change of longitudinal direction of the borehole and a predetermined rate of change of longitudinal direction to control the direction of drilling of the subterranean borehole. Exemplary embodiments of this invention tend to minimize the need for communication between a drilling operator and the bottom hole assembly, thereby advantageously preserving downhole communication bandwidth.

Il s'agit d'une méthode de détermination du taux de variation de la direction longitudinale d'un trou de forage souterrain. La méthode prévoit la mise en place d'un outil de fond de trou dans le trou de forage. L'outil en question est pourvu de deux dispositifs de surveillance. Selon la méthode, on se sert des deux dispositifs de surveillance, qui sont installés en deux points distincts de l'outil de commande, pour mesurer l'orientation longitudinale du trou de forage en deux endroits et pour traiter la direction longitudinale du trou de forage en ces deux points afin de déterminer le taux de variation de l'orientation longitudinale du trou de forage entre ces deux points. La méthode peut également comprendre la comparaison du taux de variation de l'orientation longitudinale mesuré à un taux de variation préalablement établi afin de commander l'orientation du forage du trou. Les prototypes de l'invention ont montré une tendance à minimiser la communication nécessaire entre la foreuse et l'outil de fond de trou, ce qui a l'avantage de préserver la bande passante utilisée pour communiquer avec l'appareil de fond de trou.

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