US 6,332,498 B1 · Deviated borehole drilling assembly

Abstract

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 a whipstock 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 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.

Claims45

Dependent claims

A casing section for a deviated wellbore junction comprising:

a cylindrical casing tube having a central axis and a window opening formed therein;
and
a sleeve having an opening therein, the sleeve being mounted relative to the casing tube to be rotated between a first position in which the opening of the sleeve is substantially aligned with the window opening of the casing tube and a second position in which the opening of the sleeve is not aligned with the window opening of the casing tube.

Dependencies are inferred from the claim text.

Deviated borehole drilling assembly

Life of this patent

Deviated borehole drilling assembly

Life of this patent

Abstract

Claims45