Patent ID: 8387724
Filing Date: 2013-03-05
Classification: E21B,Y10T

Abstract:
1. A method for designing a rotary drill bit and associated nozzles to improve efficiency of drilling fluids exiting from the nozzles during drilling of a wellbore in a downhole formation comprising: selecting a first drill bit design including cutting structures, nozzle locations, nozzle orientation and direction of fluid flow exiting from each nozzle; identifying any stagnate regions of drilling fluid developed between the cutting structures of the first drill bit design and adjacent portions of an associated wellbore; selecting a second drill design with the same cutting structures and a change in direction of fluid flow exiting from each nozzle; identifying any stagnate regions of drilling fluid developed between the cutting structures of the second drill bit design and adjacent portions of the associated wellbore; comparing the location of each stagnate region associated with the first drill bit design with the location of each stagnate region associated with the second drill bit design; and repeating the above steps until the location of any stagnate regions of drilling fluid have been removed from between the cutting structures of the associated drill bit design and adjacent portions of the wellbore.