发明名称 |
Method and system for controlling vibrations in borehole equipment. |
摘要 |
Vibrations in borehole equipment are controlled by defining the energy flow through the equipment as a product of an "across" variable times a "through" variable, wherein fluctuations in one variable are measured and the energy flow is controlled by adjusting the other variable in response to the measured fluctuations in said one variable. Suitable variables for defining the energy flow are voltage times current of an electrical drive, pressure times flowrate of a hydraulic drive, or torque times angular velocity of any rotary drive. <IMAGE>
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申请公布号 |
EP0443689(A2) |
申请公布日期 |
1991.08.28 |
申请号 |
EP19910200371 |
申请日期 |
1991.02.20 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. |
发明人 |
WORRALL, ROBERT NICHOLAS;STULEMEIJER, IVO PETRUS JOZEF MARIA;JANSEN, JOHAN DIRK;VAN WALSTIJN, BARTHOLOMEUS GERARDUS GOSEWINUS |
分类号 |
E21B41/00;E21B44/00;E21B47/00 |
主分类号 |
E21B41/00 |
代理机构 |
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代理人 |
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地址 |
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