E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 41/00 (2006.01) E21B 10/00 (2006.01)
Patent
CA 2628809
A method for evaluating existing drill bits and drill bit designs includes measuring several desired characteristics of a bit, including the wear experienced in drilling a formation, such as an actual formation or a simulated formation or a laboratory test fixture. A computer model may be used to evaluate the work-force and/or the sliding-wear rates that cutting elements of the bit experience as compared with the rate-of-penetration and/or durability of the bit. This information may be used to design a new drill bit, which may involve modification of the cutting elements {e.g., moving the location, volume (size and shape) or number of cutting elements from areas of the bit that receive lower work-force and sliding-wear rates to those areas that experience relatively greater work-force and sliding wear-rates. This may permit the cutting elements to be oriented more aggressively relative to a formation to be drilled. Other parameters that may be optimized include the bit profile, blade count, hydraulics, or the like.
Procédé servant à évaluer des trépans de forage existants et leurs conceptions, ce qui consiste à mesurer plusieurs caractéristiques souhaitées de trépan, y compris l'usure expérimentée en forage d'une formation, telle qu'une formation réelle ou une formation simulée ou un montage d'essai en laboratoire. On peut utiliser un modèle informatique afin d'évaluer les taux de contrainte et d'usure par friction que subissent les éléments coupants du trépan par rapport au taux de pénétration et/ou durée de vie potentielle de ce trépan. On peut utiliser ces informations afin de concevoir un nouveau trépan, ce qui peut consister à modifier les éléments coupants, par exemple, modifier l'emplacement, le volume (dimension et forme) ou le nombre des éléments coupants depuis des zones du trépan moins soumises aux contraintes et à la friction jusqu'à des zones subissant davantage ces dernières. Ceci peut permettre d'orienter les éléments coupants de façon plus aggressive par rapport à la formation à forer. Le profil du trépan, le nombre de lames, l'hydraulique, par exemple, constituent d'autres paramètres pouvant être optimisés.
Doster Michael L.
Gavia David
George Mathews
Oldham Jack Thomas
Baker Hughes Incorporated
Sim & Mcburney
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