In accordance with one embodiment of the present invention, a method for drilling wellbores includes drilling a main
wellbore and disposing a
casing string in the main
wellbore. The
casing string has a deflecting member and a sealing member coupled thereto. The method further includes disposing a
drill string having a
drill bit coupled at a lower end thereof in the
casing string and drilling, from the main
wellbore, a first lateral wellbore at a first depth with the
drill bit. The method further includes 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.