Improved anchor arm for seismic logging tool

Details Improved anchor arm for seismic logging tool Improved anchor arm for seismic logging tool

E - Fixed Constructions

21

B

E21B 23/00 (2006.01) G01V 11/00 (2006.01)

Patent

CA 2591137

A technique is described for releasing a borehole seismic acquisition tool from a stuck position within a borehole. The borehole seismic acquisition tool includes a tool body having at least one sensor package. The borehole seismic acquisition tool further includes an anchoring arm, and anchoring arm linkage adapted to connect the anchoring arm to the tool body. The anchoring arm linkage includes a weakpoint mechanism adapted to break in response to a minimum threshold amount of breaking force being applied upon the weakpoint mechanism. The breaking of the weakpoint mechanism results in a release of the borehole seismic acquisition tool from the stuck position. According to a specific embodiment, rotation of the cam against the borehole wall surface may be caused by a pulling force applied to a top portion of the borehole seismic acquisition tool.

L'invention concerne une technique permettant de libérer un instrument d'acquisition sismique en puits de forage à partir d'une position bloquée à l'intérieur du puits de forage. Ledit instrument comporte un corps d'instrument doté d'au moins un ensemble capteur. Il comporte également un bras d'ancrage, et une liaison de bras d'ancrage conçue pour relier ledit bras d'ancrage au corps d'instrument. Ladite liaison de bras d'ancrage comporte un mécanisme point faible qui se rompt en réaction à un seuil minimal de force de rupture appliquée à ce mécanisme. La rupture du mécanisme point faible libère l'instrument d'acquisition sismique en puits de forage de sa position bloquée. Selon un mode de réalisation spécifique, la rotation de la came contre la surface de la paroi du puits de forage peut être provoquée par une force de tirage appliquée à une partie supérieure de l'instrument d'acquisition sismique en puits de forage.

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