发明名称 |
A drill pipe and method of forming and reconditioning a drill pipe |
摘要 |
A drill pipe (1; 12) has a journal (2; 15) formed thereon. Integrally formed stop collars (10, 11; 16, 17) are provided at each end of the journal (2; 15). The arrangement enables rotatable tools (18) to be fitted directly to a journal (2; 15) to reduce friction between the rotatable tool (18) and the journal (2; 15). The journal (2; 15) may be of a substantially greater length than the length of the rotatable tool (18) to facilitate lubrication and cooling. Alternatively removable stop collars (30; 31) are secured adjacent the ends of a journal (28) formed on the drill pipe (25). Methods of forming the journal surface (2; 15) during manufacture of a drill pipe are disclosed. There are also disclosed methods for reconditioning an existing drill pipe (20) to form a journal (21) thereon. |
申请公布号 |
AU2078499(A) |
申请公布日期 |
1999.07.26 |
申请号 |
AU19990020784 |
申请日期 |
1999.01.05 |
申请人 |
AUSTOIL TECHNOLOGY LIMITED |
发明人 |
GEOFFREY NEIL MURRAY |
分类号 |
E21B17/10;E21B19/15;E21B29/10 |
主分类号 |
E21B17/10 |
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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