| 发明名称 |
Composite drill collar |
| 摘要 |
A drill collar is formed from a composite material to protect equipment during drilling operations as in oil and gas exploration.
|
| 申请公布号 |
US4708203(A) |
申请公布日期 |
1987.11.24 |
| 申请号 |
US19860868409 |
申请日期 |
1986.05.29 |
| 申请人 |
PHILLIPS PETROLEUM COMPANY |
发明人 |
WALKER, JOHN H. |
| 分类号 |
E21B17/16;(IPC1-7):F16L57/00 |
主分类号 |
E21B17/16 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
