Downhole measurement of formation characteristics while...

E - Fixed Constructions – 21 – B

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E21B 49/08 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2569358

A method for determining a property of formations surrounding an earth borehole being drilled with a drill bit at the end of a drill string, using drilling fluid that flows downward through the drill string, exits through the drill bit, and returns toward the earth's surface in the annulus between the drill string and the periphery of the borehole, including the following steps: obtaining, downhole near the drill bit, a pre-bit sample of the mud in the drill string as it approaches the drill bit; obtaining, downhole near the drill bit, a post-bit sample of the mud in the annulus, entrained with drilled earth formation, after its egression from the drill bit; implementing pre-bit measurements on the pre-bit sample; implementing post-bit measurements on the post-bit sample; and determining a property of the formations from the post-bit measurements and the pre-bit measurements.

Il s'agit d'une méthode qui permet de déterminer une propriété de formations entourant un forage terrestre effectué avec un trépan à l'extrémité d'un train de tiges de forage. Cette méthode fait appel à un fluide de forage qui circule vers le bas à travers le train de tiges de forage, et qui revient vers la surface de la terre dans l'espace annulaire compris entre le train de tiges de forage et la périphérie du trou de forage, selon les étapes qui suivent. L'obtention, au fond du trou, près du train de tiges de forage, d'un échantillon préliminaire de forage au trépan de la boue dans le train de tiges de forage lorsqu'elle se rapproche du train de tiges; l'obtention, au fond du trou, près du train de tiges, d'un postéchantillon de la boue dans l'espace annulaire, entraînée avec la formation terrestre forée, après sa sortie du train de tiges; la mise en oeuvre de mesures préliminaires de forage effectuées sur l'échantillon préliminaire de forage; la mise en oeuvre de postmesures de forage sur le postéchantillon de forage; et la détermination d'une propriété de formations à partir des postmesures de forage et des mesures préliminaires de forage.

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