The well reference apparatus and method of the present invention includes a reference
member preferably permanently installed within the borehole at a preferred depth
and orientation in one trip into the well. The reference member provides a permanent
reference for the location of all operations, particularly in a multi-lateral well.
The assembly of the present invention includes disposing the reference member on
the end of a pipe string. An orienting tool such as an MWD collar is disposed in
the pipe string above the reference member. This assembly is lowered into the borehole
on the pipe string. Once the preferred depth is attained, the MWD is activated
to determine the orientation of the reference member. If the reference member is
not oriented in the preferred direction, the pipe string is rotated to align the
reference member in the preferred direction. This process is repeated for further
corrective action and to verify the proper orientation of the reference member.
Upon achieving the proper orientation of the reference member, the reference member
is set within the borehole and the pipe string is disconnected from the reference
member and retrieved.