发明名称 |
Auxiliary controlled valve disposed in a drilling string |
摘要 |
An auxiliary controlled valve including a valve body (8) displaceable against a valve seat (9) disposed in a drilling string (6) to produce pressure pulses in drilling fluid renders possible a selective closing or opening of a low-resistance transmission section (12) which lies parallel to a main throttle section (10). The valve has a central passage which permits the passage of measuring instruments through the valve regardless of the particular position of a valve body (8). The valve body (8) is largely balanced out with regard to dynamic flow forces so that only a comparatively small actuating force is necessary.
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申请公布号 |
US4519574(A) |
申请公布日期 |
1985.05.28 |
申请号 |
US19830519422 |
申请日期 |
1983.08.01 |
申请人 |
NORTON CHRISTENSEN, INC. |
发明人 |
ROEPER, RUDOLF |
分类号 |
E21B34/08;E21B21/10;E21B34/06;E21B47/18;(IPC1-7):F16K31/12 |
主分类号 |
E21B34/08 |
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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