Wells – Processes – Placing or shifting well part
Reexamination Certificate
2006-03-29
2008-11-25
Bagnell, David J. (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S134000
Reexamination Certificate
active
07455118
ABSTRACT:
A downhole tool includes a mandrel, a sealing element disposed around the mandrel, an upper cone disposed above the sealing element and a lower cone disposed below the sealing element, an upper slip assembly disposed above the upper cone and a lower slip assembly disposed below the sealing element, at least one lock ring configured to maintain energization of the sealing element when the downhole tool is set, and a secondary lock that couple the upper cone with the at least one lock ring. A method of increasing pack-off force of a downhole tool includes setting the downhole tool and energizing further the sealing element by applying a differential pressure to the downhole tool. A method of retrofitting a downhole tool includes providing a secondary lock disposed around a mandrel, the secondary lock including at least one arm having an axial portion extending downwardly therefrom and a threaded portion, and assembling the secondary lock to the downhole tool, the assembling including engaging the threaded portion of the secondary lock to a threaded surface of an upper cone disposed around the mandrel of the downhole tool.
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Combined Search and Examination Report issued in corresponding GB Application No. GB0803700.4, dated Mar. 18, 2008, (3 pages).
Combined Search and Examination Report dated Jun. 5, 2007 issued in Patent Application No. GB0706053.6 (7 pages).
Melenyzer George J.
Roberts William M.
Bagnell David J.
Hutchins Cathleen R
Osha & Liang LLP
Smith International Inc.
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