Directional resistivity measurements for azimuthal proximity...

G - Physics – 01 – V

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G01V 3/30 (2006.01) E21B 47/00 (2006.01) E21B 47/026 (2006.01) G01V 3/38 (2006.01)

Patent

CA 2362542

An azimuthally tunable resistivity measurement tool (202) comprises a set of three skewed receiver antennas (216, 218, 220) and a transmitter antenna (104, 108). The three skewed receiver antennas are oriented in equally spaced azimuthal directions. The transmitter antenna transmits a radio-frequency signal that propagates through the formation surrounding a borehole. Signals from the three receiver antennas can be measured and combined to synthesize the signal that would be received by a virtual antenna oriented in any desired direction. Virtual receivers oriented perpendicular to the tool axis and with variable azimuthal orientation can be synthesized. Orientation of such a virtual receiver that has a maximized receive signal amplitude can be used to identify the direction of a nearby bed boundary, and the maximized amplitude can be used to estimate the distance to the boundary. In another embodiment, the tool comprises a set of three skewed transmitter antennas (208, 210, 212) and a receiver antenna (112). In yet anotherembodiment, the tool comprises a set of skewed transmitter antennas (208, 210, 212) and a set of skewed receiver antennas (216, 218, 220).

L'invention porte sur un outil de mesure (202) de la résistivité, réglable en azimut, comportant un jeu de trois antennes réceptrices (216, 218, 220) obliques et une antenne émettrice (104, 108). Les trois antennes obliques ont des directions azimutales également réparties. L'antenne émettrice émet un signal RF se propageant dans la formation entourant un forage. Les signaux des trois antennes réceptrices peuvent être mesurés et combinés pour synthétiser un signal reçu par une antenne virtuelle orientée dans une quelconque direction désirée. On peut synthétiser des récepteurs virtuels orientés perpendiculairement à l'axe de l'outil dans une direction azimutale variable. On peut utiliser l'orientation de ces récepteurs virtuels alors que l'amplitude du signal reçu est maximale pour identifier la direction de la lisière d'une formation, l'amplitude maximale pouvant servir à estimer la distance de la formation. Dans une variante, l'outil comporte un jeu de trois antennes émettrices (208, 210, 212) et d'une antenne réceptrice (112). Dans une autre variante, l'outil comprend un jeu de trois antennes émettrices obliques (208, 210, 212) et un jeu de trois antennes réceptrices obliques (216, 218, 220).

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