Method and apparatus for measuring mud and formation...

G - Physics – 01 – V

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G01V 11/00 (2006.01) E21B 47/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2424514

A method is disclosed for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received. The method includes turning the tool in the borehole. Energy is applied into the borehole from an energy source disposed in the tool. Measurement signals are received at a sensor disposed in the tool from a location around the borehole. The cross-section of the borehole is separated into at least a first sector and a second sector. A first measurement signal from the first sector is substantially in response to returning energy which results from the interaction of the applied energy with the mud mixture. A second measurement signal from the second sector is substantially in response to returning energy which results from the interaction of the applied energy with the formation. An indication of an intrinsic characteristic of the mud mixture is derived from the first measurement signals associated with the first sector of the borehole.

Procédé qui permet de déterminer une caractéristique d'un mélange à base de boue entourant un outil de forage introduit dans un trou de forage. Ledit procédé consiste à faire tourner l'outil dans le trou de forage. De l'énergie provenant d'une source d'énergie qui se trouve dans l'outil est appliquée dans le trou de forage. Des signaux de mesure sont reçus par un capteur placé dans l'outil, en provenance d'un site situé autour du trou de forage. La section transversale du trou de forage est séparée en au moins un premier et un deuxième secteur. Un premier signal de mesure provenant du premier secteur correspond à l'énergie de retour qui résulte de l'interaction entre l'énergie appliquée et le mélange à base de boue. Un deuxième signal de mesure provenant du deuxième secteur correspond à l'énergie de retour qui résulte de l'interaction entre l'énergie appliquée et les formations. Une indication d'une caractéristique intrinsèque du mélange à base de boue est dérivée des premiers signaux de mesure associés au premier secteur du trou de forage.

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