Use of flexible member for borehole diameter measurement

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/60 (2006.01) E21B 10/46 (2006.01) E21B 47/08 (2006.01)

Patent

CA 2694104

The downhole too] disclosed herein comprises a body, a flexible member attached to the body, and a transducer housed in the body. The flexible member compresses against one side of the wellbore and urges the body against the other side. The transducer emits a signal to the flexible member reflectable from the flexible member back to the transducer. The signal travel time from the transducer to the flexible member and back is analyzed for estimating the distance between the body and the flexible member. The standoff distance can be estimated from the distance between the body and the flexible member. From the standoff distance, the wellbore diameter is estimated. The tool may also obtain wellbore dimensions by obtaining near side wellbore standoff and using a magnetic ruler to determine bowspring flexing. The magnetic ruler results may he used in conjunction with or without the far side standoff data.

L'invention concerne un outil de fond qui comprend un corps, un élément flexible fixé au corps et un transducteur logé dans le corps. L'élément flexible se comprime contre un côté du puits de forage et pousse le corps contre l'autre côté. Le transducteur émet un signal à l'élément flexible qui peut être réfléchi par l'élément flexible en retour vers le transducteur. Le temps de déplacement de signal provenant du transducteur à l'élément flexible et en retour est analysé pour estimer la distance entre le corps et l'élément flexible. La distance annulaire peut être estimée à partir de la distance entre le corps et l'élément flexible. A partir de la distance annulaire, le diamètre de puits de forage est estimé. L'outil peut également obtenir des dimensions de puits de forage en obtenant une distance annulaire de puits de forage rapprochée et en utilisant une règle magnétique pour déterminer une flexion de ressort en arc. Les résultats de la règle magnétique peuvent être utilisés conjointement avec ou sans les données de distance annulaire lointaine.

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