Patent ID: 7669672

Claim:
A system for installing substantially perpendicular boreholes in the formation surrounding a main wellbore having a casing with a longitudinal axis the system comprising: a working string supported on the surface at the upper end of said main wellbore; an indexing tool releasably attached to said working string and comprising an indexing deflector comprising an inner member having at least one slot that runs along the outer periphery of said inner member, and an outer member that encircles said inner member, said inner member and said outer member being configured to fastenably rotate about one another during operation; and a deflector shoe; wherein the indexing deflector is configured to move the deflector shoe from a first azimuthal setting to at least a second azimuthal setting for the installation of substantially perpendicular boreholes at each azimuthal setting through said opening in response to vertical manipulation of the deflector shoe; and a tubing anchor releasably attached to said indexing tool and configured to lock at least part of said indexing tool at a predetermined depth within said main wellbore during operation of said indexing tool; wherein said indexing tool comprises an opening therethrough configured to (a) receive a borehole forming member from said working string, and (b) act as a guide path for said borehole forming member through said opening to install substantially perpendicular casing holes and substantially perpendicular boreholes in the formation surrounding the main wellbore with respect to the longitudinal axis; wherein said indexing tool is configured to mechanically move from a first setting to at least a second setting for the installation of substantially perpendicular boreholes with respect to the longitudinal axis of the main wellbore at each setting through said opening while the borehole forming member remains downhole in response to vertical manipulation by the working string; wherein said slot comprises one or more profiles, each profile further comprising a landing; wherein each profile landing correlates to a separate azimuthal setting of the deflector shoe for installing substantially perpendicular boreholes into the formation surrounding the main wellbore; and wherein said outer member comprises at least one pin extending out from the inside wall of said outer member, said pin being configured to mate with said slot.