| CPC E21B 7/061 (2013.01) [E21B 7/067 (2013.01)] | 12 Claims |
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9. A method for creating a secondary wellbore from a primary wellbore, comprising:
conveying a casing string into the primary wellbore from a surface rig, wherein a sidetrack casing assembly is coupled to the casing string and includes:
a cylindrical housing that defines a window through a sidewall of the housing;
a cover removably coupled to the housing at the window; and
a latch mechanism provided on the sidewall within the housing opposite the window;
anchoring the casing string within the primary wellbore at a predetermined depth and a predetermined angular orientation where the window aligns with a proposed wellbore path for the secondary wellbore;
transitioning the cover from a closed state, in which the cover is attached to the housing and occludes the window, to an open state, in which the cover is moved to expose the window, wherein the latch mechanism is configured to receive and secure a portion of the cover upon moving to the open state;
advancing a drilling assembly into the casing and through the window; and
drilling the secondary wellbore with the drilling assembly.
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