Dual-seal drill bit pressure communication system

Details Dual-seal drill bit pressure communication system Dual-seal drill bit pressure communication system

E - Fixed Constructions

21

B

E21B 10/25 (2006.01) E21B 10/08 (2006.01) E21B 10/22 (2006.01)

Patent

CA 2585123

A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and means for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space. The annular space may at least partially include a grease possessing a water washout value of under approximately 50% per ASTM D-4049 water spray test for lubrication characteristics and the grease may include a polymer tackifier of between approximately 1% and approximately 5% by weight.

L'invention concerne un trépan, à utiliser dans un puits contenant au moins partiellement du fluide de forage. Il comprend un corps ayant au moins deux composantes binaires, y compris au moins une jambe ayant un segment de tourillon, ainsi qu'un trépan à molettes monté rotatif sur le segment de tourillon et formant au moins une cavité du palier entre les deux. Un joint annulaire primaire est également disposé entre la jambe et le trépan à molettes, un joint annulaire secondaire est disposé entre la jambe et le trépan à molettes et entre le joint annulaire primaire et le puits. Un annulaire est également disposé entre le joint annulaire primaire et le joint annulaire secondaire. L'annulaire contient, au moins partiellement, du fluide et est presque complètement isolé du fluide de la cavité du palier et de tout moyen permettant l'écoulement du fluide du puits à l'annulaire. Le joint annulaire secondaire peut être surtout élastomérique et le moyen de permettre l'écoulement du fluide permettrait davantage l'écoulement du fluide du puits à l'annulaire. L'annulaire comprendrait, au moins partiellement, de la graisse possédant la caractéristique d'être lavée à l'eau dans une proportion inférieure à près de 50 % selon l'essai de pulvérisation d'eau ASTM D-4049 concernant les caractéristiques de lubrification et la graisse peut comprendre un agent poisseux de polymère ayant entre 1 % et environ 5 % en poids.

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