Percussive drill bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/36 (2006.01) E21B 10/40 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2528482

A percussion drill bit for drilling into a subterranean earth formation, the drill bit having a central longitudinal axis and being operable by applying repetitive axial percussive impacts on the drill bit in a direction having a component along the axis and by applying rotary motion about the axis relative to the earth formation, the drill bit comprising: - one or more axial cutters for predominantly axially cutting the subterranean earth formation in response to the axial percussive impacts; - one or more shear cutters for predominantly shear cutting the subterranean earth formation in response to the rotary motion; whereby there is a first shear cutter of the one or more shear cutters, and whereby one or more of the axial cutters are arranged with respect to at least the first shear cutter to engage with the subterranean earth formation earlier during a percussive impact than at least the first shear cutter.

La présente invention concerne un trépan destiné à forer dans une formation terrestre souterraine, ce trépan possédant un axe longitudinal central et fonctionnant par application de chocs de percussion axiaux répétitifs sur le trépan dans une direction possédant une composante le long de l'axe et par application d'un mouvement rotatif autour de cet axe par rapport à la formation terrestre. Ce trépan comprend un ou plusieurs couteaux axiaux destinés à couper axialement de manière prédominante la formation terrestre souterraine en réponse aux chocs de percussion axiaux, un ou plusieurs couteaux cisaillants destinés à couper par cisaillement de manière prédominante la formation terrestre souterraine en réponse au mouvement rotatif. Il existe ainsi un premier couteau cisaillant parmi ces couteaux cisaillants et le ou les couteaux axiaux sont agencés par rapport à ce premier couteau cisaillant de façon à entrer en contact avec la formation terrestre souterraine plus tôt pendant un choc de percussion que rendra ce ou ces premiers couteaux cisaillants.

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