| 发明名称 |
Well drilling apparatus and method |
| 摘要 |
Well drilling rates may be increased by impelling projectiles to fracture rock formations and drilling with rock drill bits through the projectile fractured rock.
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| 申请公布号 |
US4030557(A) |
申请公布日期 |
1977.06.21 |
| 申请号 |
US19760682806 |
申请日期 |
1976.05.03 |
| 申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION |
发明人 |
ALVIS, ROBERT L.;NEWSOM, MELVIN M. |
| 分类号 |
E21B7/00;E21B10/14;E21B10/18;(IPC1-7):E21B7/00 |
主分类号 |
E21B7/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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