Apparatus and methods for deploying tools in multilateral wells

Details Apparatus and methods for deploying tools in multilateral wells Apparatus and methods for deploying tools in multilateral wells

1998-01-09

1999-11-30

Suchfield, George

Wells

Processes

Parallel string or multiple completion well

166 50, 166380, F21B 2302, F21B 2303, F21B 2312

Patent

active

059925256

ABSTRACT:
Improved apparatus and methods for deploying tools in multilateral wells are disclosed. Certain ones of the apparatus and methods include a downhole tool centralizer assembly for coupling to a downhole tool. The centralizer assembly has a tubular centralizer retainer with an external surface and an annular recess on the external surface. An annular spring member is disposed within the annular recess, and the annular spring member has an outer diameter greater than a predetermined inner diameter of a bushing disposed proximate a junction between a main wellbore and a lateral wellbore. Other ones of the apparatus and methods include a downhole tool having a substantially identical tubular centralizer retainer and annular spring member. As the centralizer assembly, or the downhole tool, enters the bushing, the annular spring member elastically deforms so that the outer diameter of the spring member becomes substantially equal to the predetermined inner diameter of the bushing. Such elastic deformation prevents the centralizer assembly, or the downhole tool, from accidentally entering the lateral wellbore.

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