| 发明名称 |
METHODS AND APPARATUS FOR DRILLING WELLS |
| 摘要 |
A well fluid additive having a heavier first bead and a lighter second bead, with the first bead having a specific gravity that exceeds the specific gravity of the second bead by at least 1 percent.
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| 申请公布号 |
US2013126242(A1) |
申请公布日期 |
2013.05.23 |
| 申请号 |
US201213473838 |
申请日期 |
2012.05.17 |
| 申请人 |
JOHNSON TOMMY;O'NEAL DUSTIN |
发明人 |
JOHNSON TOMMY;O'NEAL DUSTIN |
| 分类号 |
E21B7/04 |
主分类号 |
E21B7/04 |
| 代理机构 |
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代理人 |
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| 主权项 |
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