Borehole seismic pulse generation using rapid-opening valve

Details Borehole seismic pulse generation using rapid-opening valve Borehole seismic pulse generation using rapid-opening valve

E - Fixed Constructions

21

B

E21B 28/00 (2006.01) E21B 43/16 (2006.01)

Patent

CA 2621855

During a surge-pulsing operation in a borehole (e.g an oil-well undergoing remediation) liquid is stored under pressure upstream of a valve, and then released through the valve suddenly enough to create a seismic wave, which propagates into the formation around the borehole, and assists the surge- pulsing to improve the conductivity and liquid- injectability of the formation. The downhole valve achieves the rapid-opening requirement by virtue of its geometrical layout, as dictated by the strictures of the downhole environment.

L'invention concerne la génération d'impulsions de pression dans un trou de sonde (par ex. un puits de pétrole en cours de réhabilitation), opération au cours de laquelle du liquide est stocké sous pression en amont d'une vanne, puis libéré à travers la vanne assez soudainement pour créer une onde sismique, qui se propage dans la formation entourant le trou de sonde et contribue aux impulsions de pression pour améliorer la conductivité et l'aptitude de la formation pour l'injection de liquide. La vanne de fond répond au besoin d'ouverture rapide grâce à sa disposition géométrique, dans les limites imposées par l'environnement de fond de trou.

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