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Title: US6991048: Wellbore plug system and method
[ Derwent Title ]


Country: US United States of America

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16 pages

 
Inventor: Zupanick, Joseph A.; Pineville, WV, United States of America

Assignee: CDX Gas, LLC, Dallas, TX, United States of America
other patents from CDX GAS, LLC (796194) (approx. 21)
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Published / Filed: 2006-01-31 / 2002-07-12

Application Number: US2002000194422

IPC Code: Advanced: E21B 7/04; E21B 7/06; E21B 41/00;
Core: more...

ECLA Code: E21B7/06B; E21B41/00L; E21B41/00L2;

U.S. Class: 175/061; 175/080; 166/050; 166/117.6; 166/313;

Field of Search: 166/313,50,117.6 125/061,62,8 F

Priority Number:
2002-07-12  US2002000194422

Abstract:     In accordance with one embodiment of the present invention, a method for drilling wellbores includes drilling a main wellbore, disposing a casing string having a deflecting member at a lower end thereof in the main wellbore, disposing a drill string having a drill bit at a lower end thereof in the casing string, and drilling, with the drill bit, a first lateral wellbore at a first depth in the main wellbore. The method further includes transferring the casing string to a second depth in the main wellbore that is less than the first depth, disposing a first temporary plug in the main wellbore at the second depth to prevent gas from flowing up the main wellbore past the second depth, transferring the casing string to a third depth in the main wellbore that is less than the second depth, and drilling, with the drill bit, a second lateral wellbore at the third depth.

Attorney, Agent or Firm: Fish & Richardson P.C. ;

Primary / Asst. Examiners: Neuder, William;

Maintenance Status: E1 Expired  Check current status

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First Claim:
Show all 17 claims
    1. A method for drilling wellbores, comprising:

drilling a main wellbore;

disposing a casing string having a deflecting member at a lower end thereof in the main wellbore;

disposing a drill string having a drill bit at a lower end thereof in the casing string;

drilling, with the drill bit, a first lateral wellbore at a first depth in the main wellbore;

transferring the casing string to a second depth in the main wellbore that is less than the first depth;

disposing a first temporary plug in the main wellbore at the second depth to prevent gas from flowing up the main wellbore past the second depth without removing the casing string from the main well bore;

transferring the casing string to a third depth in the main wellbore that is less than the second depth;

drilling, with the drill bit, a second lateral wellbore at the third depth; and

removing the first temporary plug, wherein removing the first temporary plug comprises either drilling through the first temporary plug or dissolving the first temporary plug.



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Forward References: Show 28 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (28)   |   Backward references (294)   |   Citation Link

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  • Continuity Data:
    Application Number Filed Notes

    US2002000194422 2002-07-12  is a related to the prior publication
         US20040007390A1 issued 2004-01-15  Wellbore plug system and method


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