发明名称 |
DEVIATED BOREHOLE DRILLING ASSEMBLY |
摘要 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and an upper section having a sloping face, commonly known as the directional portion of a whipstock. The toolguid e is coated with a material such as epoxy or polyurethane to provide a repairable surface and one which can be removed to facilitate removal of the toolguide from the well bore. The lower orienting section has a latch which extends radially outwardly fro m the section and can be locked in the outwardly biased position. The casing secti on of the present invention includes a sleeve which can be moved between a first position in which access to the window opening of casing section is not affected and a second position in which the main casing is sealed from the liner section of a deviated wellbore to provide a hydraulic seal against passage of fluids from outside the casin g of the wellbore into the main casing.
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申请公布号 |
CA2526877(A1) |
申请公布日期 |
2000.02.18 |
申请号 |
CA19982526877 |
申请日期 |
1998.08.18 |
申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
GEORGE, GRANT E. E.;BEGG, STEPHEN M. |
分类号 |
E21B7/08;E21B23/02;E21B23/04;E21B23/12;E21B47/09 |
主分类号 |
E21B7/08 |
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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