发明名称 |
Drilling with concentric strings of casing |
摘要 |
The present invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, with each casing string having a drill bit piece disposed at the lower end thereof. The drill bit pieces of adjacent casing strings are releasably connected to one another. In another aspect of the invention, a method is provided for setting concentric casing strings within a wellbore with the drilling system. In another aspect of the invention, the releasably connected drill bit pieces comprise a drill bit assembly.
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申请公布号 |
US2004124010(A1) |
申请公布日期 |
2004.07.01 |
申请号 |
US20020331964 |
申请日期 |
2002.12.30 |
申请人 |
GALLOWAY GREGORY G.;BRUNNERT DAVID J. |
发明人 |
GALLOWAY GREGORY G.;BRUNNERT DAVID J. |
分类号 |
E21B7/20;E21B17/07;(IPC1-7):E21B7/00 |
主分类号 |
E21B7/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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