| 发明名称 |
PDF valve |
| 摘要 |
A differential float and cementing valve assembly used to position and cement casing in a well bore. A leaf spring and other components of the assembly are preferably constructed of composite materials and/or plastics that can be drilled up with polycrystalline diamond compact (PDC) bits.
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| 申请公布号 |
US6547007(B2) |
申请公布日期 |
2003.04.15 |
| 申请号 |
US20010836755 |
申请日期 |
2001.04.17 |
| 申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
SZARKA DAVID D.;ROGERS HENRY E. |
| 分类号 |
E21B21/10;E21B34/00;E21B34/14;(IPC1-7):E21B34/10;E21B43/12 |
主分类号 |
E21B21/10 |
| 代理机构 |
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代理人 |
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