| 发明名称 |
ROTARY DRILLING HEAD ASSEMBLY |
| 摘要 |
A rotary drilling head assembly for wellbore forming operations comprising a stationary housing which supports a rotatable sleeve. A stripper rubber located within the rotatable sleeve slidably receives a tubing string in sealed relationship therethrough.
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| 申请公布号 |
US3868832(A) |
申请公布日期 |
1975.03.04 |
| 申请号 |
US19730339037 |
申请日期 |
1973.03.08 |
| 申请人 |
BIFFLE, MORRIS S. |
发明人 |
BIFFLE, MORRIS S. |
| 分类号 |
E21B21/01;E21B33/08;(IPC1-7):F16D3/06 |
主分类号 |
E21B21/01 |
| 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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