Subsurface drill string

Pipe joints or couplings – Particular interface – Tapered

Reexamination Certificate

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Details

C285S329000, C285S355000, C166S242100

Reexamination Certificate

active

07431348

ABSTRACT:
A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

REFERENCES:
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patent: 6908121 (2005-06-01), Hirth et al.
patent: 2003/0132632 (2003-07-01), Schoonen

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