EP 1389666 A2 20040218 - Force-balanced roller-cone bits, systems, drilling methods, and design methods
Title (en)
Force-balanced roller-cone bits, systems, drilling methods, and design methods
Title (de)
Kraftmässig ausgeglichene Rollenmeissel, Systeme, Bohrverfahren und entsprechende Konstruktionsmethoden
Title (fr)
Trépans à cônes à forces compensées, systèmes, procédés de forage et procédés de conception correspondants
Publication
Application
Priority
- EP 99945375 A 19990831
- US 9846698 P 19980831
Abstract (en)
A method of designing a roller cone drill bit is disclosed. The method comprises: (a) calculating the force balance conditions of a bit; (b) defining design variables; (c) determine lower and upper bounds for the design variables; (d) defining objective functions; (e) defining constraint functions; (f) performing an optimisation means; and (g) evaluating an optimised cutting structure by modelling. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/08 (2006.01); E21B 10/16 (2006.01); E21B 41/00 (2006.01)
CPC (source: EP)
E21B 10/08 (2013.01); E21B 10/16 (2013.01)
Designated contracting state (EPC)
GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 03021140 A 19990831