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(11) | EP 0 961 008 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Apparatus and method for drilling and completing a deviated borehole |
| (57) An assembly for formation and completion of deviated wellbores is disclosed which
includes a toolguide (18) and a casing section (8) which can be used together or separately.
The toolguide includes a lower orienting section (22) and a whipstock (24) having
a sloping face, commonly known as the directional portion of a whipstock. The toolguide
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 (20) which extends radially outwardly
from the section and can be locked in the outwardly biased position. The casing section
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 casing of the
wellbore into the main casing. |