发明公开
- 专利标题： METHODS AND SYSTEMS FOR DRILLING
- 专利标题（中）： 钻井方法及系统
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申请号： EP11769369.7申请日： 2011-04-11
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公开(公告)号： EP2558673A2公开(公告)日： 2013-02-20
- 发明人: EDBURY, David Alston , GUERRERO, Jose Victor , MACDONALD, Duncan Charles , NORMAN, Jason B. , ROGERS, James Bryon , SITTON, Donald Ray
- 申请人： Shell Oil Company , Shell Internationale Research Maatschappij B.V.
- 申请人地址： One Shell Plaza P.O. Box 2463 Houston, TX 77252-2463 US
- 专利权人： Shell Oil Company,Shell Internationale Research Maatschappij B.V.
- 当前专利权人： Shell Oil Company,Shell Internationale Research Maatschappij B.V.
- 当前专利权人地址： One Shell Plaza P.O. Box 2463 Houston, TX 77252-2463 US
- 代理机构： Matthezing, Robert Maarten
- 优先权： US323251P 20100412
- 国际公布： WO2011130159 20111020
- 主分类号： E21B7/06
- IPC分类号： E21B7/06 ; E21B47/02
摘要：
METHODS AND SYSTEMS FOR DRILLING A method of controlling a direction of drilling of the drill string (110) used to form an opening in a subsurface formation (102), comprises varying a speed of the drill string during rotational drilling such that the drill string (110) is at a first speed during a first portion of the rotational cycle and at a second speed during a second portion of the rotational cycle wherein the first speed is higher than the second speed, and wherein operating at the second speed in the second portion of the rotational cycle causes the drill string to change the direction of drilling.
公开/授权文献
- EP2558673B1 METHODS AND SYSTEMS FOR DRILLING 公开/授权日：2019-12-11
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