Title:
DRILL STRING MEMBER
Document Type and Number:
WIPO Patent Application WO2002031312
Kind Code:
A3
Abstract:
A drill string member is formed by providing a former (2) and a cylindrical member (1) to be shaped in relationship with the former. Seals (20) are provided between opposing ends of a thick wall cylinder (3) and the cylindrical member, a pressure is applied in the annulus (4) between the cylindrical member and the thick wall cylinder sufficient to deform the cylindrical member against the former. The drill string member thus formed has a constant wall thickness and a non-circular former provides a non-circular drill string member.
Inventors:
SPRINGER JOHANN (AT)
Application Number:
PCT/IB2001/002105
Publication Date:
August 01, 2002
Filing Date:
October 09, 2001
Export Citation:
Assignee:
SPRINGER JOHANN (AT)
International Classes:
E21B17/00; E21B17/22; B21D26/00; (IPC1-7): E21B17/16; E21B17/22; B21D26/02; B21D26/08
Foreign References:
| US4771811A | 1988-09-20 | |||
| GB1345924A | 1974-02-06 | |||
| US5203190A | 1993-04-20 | |||
| US4751836A | 1988-06-21 | |||
| US3889506A | 1975-06-17 |
Other References:
See also references of EP 1328702A2
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