Wellbore casing section with moveable portion for providing a casing exit

摘要

Systems and methods for providing a casing exit include a casing section having a generally cylindrical outer sleeve including a proximal end and a distal end. The outer sleeve may define an outer window extending between the proximal end and the distal end. A generally cylindrical inner sleeve may be received within the outer sleeve and may define an inner window. The inner sleeve may be moveable between a first position in which the inner window is misaligned with the outer window and the inner sleeve substantially closes the outer window, and a second position in which the inner window is aligned with the outer window. A deflector tool may be configured to engage the inner sleeve and move the inner sleeve from the first position to the second position.

主权项

1. A casing section for positioning in a wellbore at a location where it is desired to form a diverging lateral borehole, the casing section comprising:
a generally cylindrical outer sleeve including a proximal end and a distal end, the outer sleeve defining an outer window extending between the proximal end and the distal end; and a generally cylindrical inner sleeve received within the outer sleeve and defining an inner window, the inner sleeve being moveable between a first position in which the inner window is misaligned with the outer window and the inner sleeve substantially closes the outer window, and a second position in which the inner window is aligned with the outer window, wherein the inner sleeve includes an alignment portion that defines an axially-extending slot having cam surfaces extending in a proximal and radial direction, the alignment portion being engageable to move the inner sleeve with respect to the outer sleeve.