Patent ID: 7085696
Filing Date: 2006-08-01
Classification: E21B,Y02E

Abstract:
1. A method for enhanced decision making based on optimization of a drilling system using an economic evaluation factor comprising: generating a first economic evaluation factor for the drilling system by using an iterative drilling simulation of a well bore in a formation based on a drilling simulation model having at least one of the following formation characteristics selected from the group consisting of lithology, rock strength, shale plasticity and porosity and a drilling mechanics parameter; determining whether the first economic factor achieves a desired optimization; varying the drilling mechanics parameter of the drilling system based on the determination such that the iterative drilling simulation generates a second economic evaluation factors; determining whether the second economic evaluation factor achieves the desired optimization; selecting the drilling mechanics parameter from the group consisting of bit type, bit diameter, bit cutting structure 3D (three dimensional) model, bit work rating, bit junk slot area, bit total flow area (TFA), bit pressure drop, impact force, jet velocity and drill bit costs; continuing the iterative drilling drilling simulation of the well bore until the desired optimization is achieved; and modifying the iterative drilling simulation to take into account drill bit enhancements.