发明名称 |
Dual conduit drill stem member |
摘要 |
Dual conduit drill stem member includes pipe having two piece tube therewithin affixed to pipe at outer ends and inner ends coupled by composite elastomeric sleeve and telescopic metal coupling, adjacent members being connected by threaded tool joints on pipe ends and compression sealed telescopic joints on tube outer ends.
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申请公布号 |
US4012061(A) |
申请公布日期 |
1977.03.15 |
申请号 |
US19740535193 |
申请日期 |
1974.12.23 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
OLSON, WALLACE FRED |
分类号 |
E21B17/042;E21B17/18;F16L7/00;F16L27/00;(IPC1-7):F16L47/00 |
主分类号 |
E21B17/042 |
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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