Axially extended downhole seismic source

Details Axially extended downhole seismic source Axially extended downhole seismic source

G - Physics

01

V

G01V 1/133 (2006.01)

Patent

CA 2408009

An axially extended downhole seismic source is disclosed. In one embodiment, the seismic source includes multiple pressure storage chambers, each having an inlet valve and an outlet valve. The inlet valve is coupled between the pressure storage chamber and the interior of the drill string (8), and the outlet valve is similarly coupled between the pressure storage chamber and the annular space (20) around the drill string. The use of multiple pressure storage chambers allows the pressure front from the seismic source to be extended axially to advantageously increase the fraction of seismic energy transmitted into the formation while preventing damage to the formation.

L'invention concerne une source sismique de trou de fond s'étendant dans le sens axial. Dans un mode de réalisation, la source sismique comprend plusieurs chambres de stockage sous pression, chacune possédant une vanne d'entrée et une vanne de sortie. Ladite vanne d'entrée est couplée entre une chambre de stockage sous pression et l'intérieur du train de forage (8) et la vanne de sortie est couplée de manière similaire entre la chambre de stockage sous pression et l'espace annulaire (20) entourant le train de forage. L'utilisation de plusieurs chambres de stockage sous pression permet au front de l'onde de surpression provenant de la source sismique de s'étendre axialement de manière à augmenter la fraction d'énergie sismique transmise dans la formation, alors que l'on prévient les endommagements que pourrait subir la formation.

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