Downhole signal source

Details Downhole signal source Downhole signal source

G - Physics

01

V

G01V 3/08 (2006.01)

Patent

CA 2565979

A signaling apparatus comprises a magnet and a shield moveable relative to the magnet. The shield is moveable relative to the magnet between a first position in which the magnet is relatively exposed and a second position in which the magnet is relatively shielded. The apparatus can include a synchronization signal source, a downhole sensor signal source, and/or means for modulating the magnetic field in response to the signal from any source. A method of using the signaling apparatus to locate a bottomhole assembly includes moving the shield so as to modulate the magnetic field created by the magnet, sensing the modulation of the magnetic field, and determining the location of the bottomhole assembly using the information collected. The BHA can be located using phase shift or amplitude measurements. Receivers detecting the modulated magnetic field can be at or below the earth's surface.

Un appareil de signalisation comprend un aimant et une protection mobile par rapport A l'aimant. La protection est mobile par rapport A l'aimant entre une premiEre position dans laquelle l'aimant est relativement exposE et une deuxiEme position dans laquelle l'aimant est relativement protEgE. L'appareil peut inclure une source de signal de synchronisation, une source de signal de capteur de fond de trou et/ou un moyen pour moduler le champ magnEtique en rEponse au signal provenant de n'importe quelle source. Une mEthode d'utilisation de l'appareil de signalisation pour localiser un ensemble de fond de trou, comprend le dEplacement de la protection de maniEre A moduler le champ magnEtique crEE par l'aimant, la mesure de la modulation du champ magnEtique et la dEtermination de l'emplacement de l'ensemble de fond de trou A l'aide des informations collectEes. Le BHA peut Etre localisE A l'aide de mesures de changement de phase ou d'amplitude. Les rEcepteurs dEtectant le champ magnEtique modulE peuvent Etre A la surface de la terre ou sous elle.

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