公开(公告)号：CA2507787C

公开(公告)日：2008-09-23

申请号：CA2507787

申请日：2005-05-17

Applicant: WEATHERFORD LAMB

Inventor： ROBERTSON ROBERT E ,  HALFORD HUBERT E ,  CARTER THURMAN B JR ,  REDLINGER THOMAS M

IPC: E21B29/06 ,  E21B20060101 ,  E21B7/06 ,  E21B29/00 ,  E21B41/00

Abstract: A method is provided that allows the operator to re-enter a primary wellbore from a lateral wellbore after the lateral wellbore has been completed. The method generally comprises the steps of locating a cutting device such as a milling bit adjacent a tubular such as a liner within a wellbore, rotating the milling bit while maintaining an axial position of the milling bit relative to the liner to initiate an opening, and rotating and axially advancing the milling bit to complete the opening. In addition, a bottom hole assembly that facilitates re-entry into the primary wellbore from a lateral wellbore is provided. The bottom hole assembly generally includes a drill collar or other heavy pipe structure, and a mill. The mill has a body and cutting structures. The cutting structures apply lateral force against a surrounding pipe to form an initial lip through the wall of the pipe.

公开(公告)号：GB2414254B

公开(公告)日：2008-08-06

申请号：GB0510223

申请日：2005-05-19

Applicant: WEATHERFORD LAMB

Inventor： CARTER THURMAN B JR ,  ROBERTSON ROBERT E ,  HALFORD HUBERT EUGENE ,  REDLINGER THOMAS M

IPC: E21B7/06 ,  E21B20060101 ,  E21B29/00 ,  E21B29/06 ,  E21B41/00

公开(公告)号：CA2507787A1

公开(公告)日：2005-11-20

申请号：CA2507787

申请日：2005-05-17

Applicant: WEATHERFORD LAMB

Inventor： REDLINGER THOMAS M ,  HALFORD HUBERT E ,  CARTER THURMAN B JR ,  ROBERTSON ROBERT E

IPC: E21B20060101 ,  E21B7/06 ,  E21B29/00 ,  E21B29/06 ,  E21B41/00

Abstract: A method is provided that allows the operator to re-enter a primary wellbore from a lateral wellbore after the lateral wellbore has been completed. The method generally comprises the steps of locating a cutting device such as a milling bit adjacent a tubular such as a liner within a wellbore, rotating the milling bit while maintainin g an axial position of the milling bit relative to the liner to initiate an opening, an d rotating and axially advancing the milling bit to complete the opening. In addition, a bottom hole assembly that facilitates re-entry into the primary wellbore from a lateral wellbore is provided. The bottom hole assembly generally includes a drill collar or othe r heavy pipe structure, and a mill. The mill has a body and cutting structures. The cutting structures apply lateral force against a surrounding pipe to form an initial lip through the wall of the pipe.