| 发明名称 |
Mid pulse valve for measurement-while-drilling system |
| 摘要 |
<p>A metering valve (80A) for producing a mud-pulse in a mud-flow. The metering valve comprises a straight passage (182,482,582,682) for a straight stream of the mud flow and a detour passage (183,483,583,683) providing a tortuous path for the mud flow. A changeover means shifts a main stream of the mud flow between the straight passage and the detour passage. <IMAGE> <IMAGE></p> |
| 申请公布号 |
EP0747570(A1) |
申请公布日期 |
1996.12.11 |
| 申请号 |
EP19960112231 |
申请日期 |
1993.12.03 |
| 申请人 |
AKISHIMA LABORATORIES (MITSUI ZOSEN) INC. |
发明人 |
YUASA, HAJIME;KAMIIRISA, HIKARU;HOSONO, KAZUHO;YAMAMOTO, KEIJIRO;MIYAJI, HIDEYUKI |
| 分类号 |
E21B47/12;E21B23/00;E21B41/00;E21B47/01;E21B47/18;(IPC1-7):E21B47/18 |
主分类号 |
E21B47/12 |
| 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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