Method of regulating drilling conditions applied to a well bit

Details Method of regulating drilling conditions applied to a well bit Method of regulating drilling conditions applied to a well bit

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2250185

A method of regulating drilling conditions applied to a given well bit comprises assaying the compressive strength of the formation in an interval to be drilled by said bit. Wear of critical bit structure of the same size and design as in said given bit and which structure has drilled material of approximately the same compressive strength as that so assayed, is analyzed along with respective drilling data for the worn structure. From said analysis, a power limit for the respective compressive strength, above which power limit excessive wear is likely to occur is determined. Drilling conditions, such as rotary speed and weight-on-bit, at which the given bit is operated are regulated to maintain a desired operating power less than or equal to the power limit. Where several feasible rotary speed/weight-on-bit combinations may result in the desired operating power, these conditions are optimized.

L'invention se rapporte à un procédé de régulation des conditions de forage appliquées à un trépan donné, et consistant à tester la résistance à la compression de la formation dans un intervalle devant être foré par ce trépan; analyser l'usure de la structure critique du trépan ayant une taille et une forme données identiques à celles du trépan considéré, laquelle structure est constituée d'un matériau foré ayant approximativement la même résistance à la compression que celle analysée, et analyser également les données de forage respectives de la structure usée. A partir de ces analyses, on détermine une limite de puissance destinée à être appliquée à la résistance à la compression respective, limite de puissance au-dessus de laquelle une usure excessive risque de se produire. On régule les conditions de forage telles que vitesse rotative et poids du trépan dans lesquelles le trépan considéré fonctionne afin de maintenir une puissance de fonctionnement désirée inférieure ou égale à la limite établie. Lorsque plusieurs combinaisons possibles de vitesse rotative/poids sur l'outil peuvent générer la puissance de fonctionnement désirée, ces conditions sont optimisées.

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