E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/08 (2006.01)
Patent
CA 2477576
This invention relates to a single cone bit with offset axis and composite cones for oil and gas drilling, mining and other subterranean drilling operations. The bit consists of a head body and a cone. The cone section has a shape of composite cones. The outer circumference of the cone is composed of from back face of the cone to top of the cone an extended gage surface, an outer cone surface and a main cone surface. A plurality of cutting elements is mounted onto each cone surface. A head journal at lower end of the head body is for rotatablely connection with the cone. Between the axis of head journal and the axis of the bit, there is an offset value d along rotating direction of the cone. A gage pad is arranged on head body at a location opposite to the offset direction of the head journal. The gage pad is fitted with inserts or hardfaced with wear resistant alloy to prevent bit from whirling and prevent head body from being worn out and to ensure gage protection. Junk slots are machined along the side of head body and jet ports are arranged at lower bevel of the head body to guarantee cuttings removal and effective cleaning results. This invention improves the bit's ability to break rocks through impact for specific use in hard formations. The bit performance is obviously improved and overall drilling cost reduced.
L'invention concerne un trépan à molettes muni d'un rouleau (6) et d'un pied (4). Une broche de contrôle (13) est formée dans la partie inférieure du pied (4) pour servir de support au rouleau (6). La surface du rouleau (6) consiste en une surface arrière (10), une surface extérieure et une surface centrale (8) sur laquelle sont montées les dents de coupe (7). L'axe de la broche de contrôle (13) est décalé sur une distance "d" par rapport à l'axe du trépan à molettes. Le pied (4) est muni d'une surface de jauge (1) dans laquelle sont installées les dents de coupe (14) de la jauge. Le dispositif comprend deux buses à jets (2, 3) sur la pente du côté inférieur du pied (4). L'évacuation des matériaux des coupes réalisées pendant le forage est facilitée grâce à une meilleure capacité d'impact de la présente invention.
Liu Xuezhong
Zhao Yan
Kingdream Public Ltd. Co.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
LandOfFree
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