公开(公告)号：CA2426339A1

公开(公告)日：1997-07-31

申请号：CA2426339

申请日：1997-01-24

Applicant: WEATHERFORD LAMB

Inventor： HALFORD HUBERT E ,  LANGFORD DALE E ,  BLIZZARD WILLIAM A JR

IPC: E21B7/04 ,  E21B10/00 ,  E21B29/06

Abstract: There is provided a mill for milling an opening in a tubular comprising a bo dy having an upper end connectable to a drill string, a lower end provided with millin g and/or cutting material, a first fluid flow bore extending generally axially of the body, a second fluid flow bore extending from the first fluid flow bore and opening in the exterior of the body substantially on the rotational axis thereof, and a plurality of inclined fluid flow bores extending from the first fluid flow bore and opening in the exterior of the body around the second fluid flow bore, characterised in that the second flu id flow bore is lined with a layer of milling and/or cutting material, at least one of th e inclined fluid flow bores is also provided with a layer of milling and/or cutting material, the second fluid flow bore is of smaller diameter than the first fluid flow bore, and t he inclined fluid flow bores are of smaller diameter than the second fluid flow bore, at least before the application of the lining of cutting and/or grinding material thereto.

公开(公告)号：CA2682316A1

公开(公告)日：2008-10-16

申请号：CA2682316

申请日：2008-04-04

Applicant: WEATHERFORD LAMB

Inventor： STULBERG MARTY ,  XU WEI ,  REDLINGER THOMAS M ,  CARTER THURMAN B ,  RHINEHART BILL ,  HALFORD HUBERT E

IPC: E21B10/26 ,  E21B10/32 ,  E21B29/10

Abstract: A method of removing a restriction in a tubular located in a well include s providing a drilling assembly with a drill bit and a reamer, the reamer ha ving a cutting structure for removing the restriction; drilling through a lo wer portion of the tubular; expanding the reamer at a location below the res triction; and urging the reamer back toward the restriction to remove the re striction.

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：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.

公开(公告)号：CA2426336A1

公开(公告)日：1997-07-31

申请号：CA2426336

申请日：1997-01-24

Applicant: WEATHERFORD LAMB

Inventor： BLIZZARD WILLIAM A JR ,  LANGFORD DALE E ,  HALFORD HUBERT E

IPC: E21B7/04 ,  E21B10/00 ,  E21B29/06

Abstract: There is provided a method and apparatus for milling an opening in a tubular in a wellbore, the method comprising: installing a mill guide in the tubular at a desired milling location, the mill guide comprising a hollow straight cylindrical bo dy having an axial bore therethrough, an upper end with an upper end opening and a lower end with a lower end opening, the lower end having a first inside surface and a second inside surface extending along straight lines parallel to one another and to the ax is of the bore and diametrically opposite one another, the first inside surface being short er than the second inside surface, inserting a mill through the tubular and the bore of the mill guide so that the mill is in contact with the second inside surface and is directe d by the contact against the tubular at the desired milling location adjacent the lower end opening, and milling an opening in the tubular.

公开(公告)号：CA2682316C

公开(公告)日：2013-02-19

申请号：CA2682316

申请日：2008-04-04

Applicant: WEATHERFORD LAMB

Inventor： RHINEHART BILL ,  STULBERG MARTY ,  CARTER THURMAN B ,  XU WEI ,  REDLINGER THOMAS M ,  HALFORD HUBERT E

IPC: E21B10/26 ,  E21B10/32 ,  E21B29/10

Abstract: A method of removing a restriction in a tubular located in a well includes providing a drilling assembly with a drill bit and a reamer, the reamer having a cutting structure for removing the restriction; drilling through a lower portion of the tubular; expanding the reamer at a location below the restriction; and urging the reamer back toward the restriction to remove the restriction.

公开(公告)号：CA2596094C

公开(公告)日：2011-01-18

申请号：CA2596094

申请日：2007-08-03

Applicant: WEATHERFORD LAMB

Inventor： SULLIVAN MICHAEL ,  REDLINGER THOMAS M ,  HALFORD HUBERT E ,  BAILEY THOMAS F

IPC: E21B29/00 ,  B23C5/16 ,  E21B10/00 ,  E21B23/00

Abstract: A method and apparatus for milling an item in a wellbore. The method and apparatus including providing a milling tool having one or more blades which are geometrically configured to resist deflection by distributing cutting forces in multiple directions.

公开(公告)号：CA2596094A1

公开(公告)日：2008-02-08

申请号：CA2596094

申请日：2007-08-03

Applicant: WEATHERFORD LAMB

Inventor： SULLIVAN MICHAEL ,  BAILEY THOMAS F ,  REDLINGER THOMAS M ,  HALFORD HUBERT E

IPC: E21B29/00 ,  B23C5/16 ,  E21B10/00 ,  E21B23/00

Abstract: A method and apparatus for milling an item in a wellbore. The method and apparatus including providing a milling tool having one or more blades which are geometrically configured to resist deflection by distributing cutting forces in multiple directions.

公开(公告)号：CA2426339C

公开(公告)日：2006-06-06

申请号：CA2426339

申请日：1997-01-24

Applicant: WEATHERFORD LAMB

Inventor： HALFORD HUBERT E ,  LANGFORD DALE E ,  BLIZZARD WILLIAM A JR

IPC: E21B10/00 ,  E21B7/04 ,  E21B29/06

Abstract: There is provided a mill for milling an opening in a tubular comprising a bo dy having an upper end connectable to a drill string, a lower end provided with millin g and/or cutting material, a first fluid flow bore extending generally axially of the body, a second fluid flow bore extending from the first fluid flow bore and opening in the exterior of the body substantially on the rotational axis thereof, and a plurality of inclined fluid flow bores extending from the first fluid flow bore and opening in the exterior of the body around the second fluid flow bore, characterised in that the second flu id flow bore is lined with a layer of milling and/or cutting material, at least one of th e inclined fluid flow bores is also provided with a layer of milling and/or cutting material, the second fluid flow bore is of smaller diameter than the first fluid flow bore, and t he inclined fluid flow bores are of smaller diameter than the second fluid flow bore, at least before the application of the lining of cutting and/or grinding material thereto.

公开(公告)号：GB2414254A

公开(公告)日：2005-11-23

申请号：GB0510223

申请日：2005-05-19

Applicant: WEATHERFORD LAMB

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

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

Abstract: A method of re-entering a primary wellbore10 from a lateral wellbore 20 after a lateral wellbore has been completed comprises the steps of locating a cutting device (210 figure 3) such as a milling bit adjacent a tubular such as a liner 28 within a wellbore, rotating the milling bit whilst maintaining an axial position of the milling bit relative to the liner to initiate an opening18, and rotating and axially advancing the milling bit to complete the opening. Included is an embodiment relating to a method of removing a portion of a liner at an intersection of a lateral wellbore as well as an embodiment relating to a bottom hole assembly (200 figure 3) comprising a drill collar (230 figure 3), a sub (220, 220 figure 3) connected to the drill collar and a lead mill (210 figure 3).