Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2006-01-31
2006-01-31
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S075000, C166S117600
Reexamination Certificate
active
06991047
ABSTRACT:
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.
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patent
CDX Gas, LLC
Fish & Richardson P.C.
Tsay Frank
LandOfFree
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