Patent ID: 6991047
Filing Date: 2006-01-31
Classification: E21B

Abstract:
1. A method for drilling wellbores, comprising: drilling a main wellbore; disposing a casing string in the main wellbore, the casing string having a deflecting member and a sealing member coupled thereto; disposing a drill string having a drill bit coupled at a lower end thereof in the casing string; drilling, from the main wellbore, a first lateral wellbore at a first depth with the drill bit; removing the drill bit from the first lateral wellbore; transferring the casing string and the drill bit to a second depth that is higher than the first depth; drilling, from the main wellbore, a second lateral wellbore at the second depth with the drill bit; and preventing, using the sealing member, a fluid from the first lateral wellbore from flowing above approximately the second depth while drilling the second lateral wellbore.