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    PROTECTION OF CASING LOWSIDE WHILE MILLING CASING EXIT
    1.
    发明公开
    PROTECTION OF CASING LOWSIDE WHILE MILLING CASING EXIT 有权
    当住房OUTPUT铣削外壳底部保护

    公开(公告)号：EP2817474A4

    公开(公告)日：2015-11-11

    申请号：EP12868996

    申请日：2012-02-24

    申请人： HALLIBURTON ENERGY SERVICES INC

    发明人： PARLIN JOSEPH DEWITT ,  DAHL ESPEN

    IPC分类号： E21B29/06 ,  E21B7/06 ,  E21B17/10

    CPC分类号： E21B7/061 ,  E21B17/04 ,  E21B17/1007 ,  E21B29/06

    摘要： The lowside of a casing joint is protected from wear while milling a casing exit for a lateral borehole. The casing joint is coupled to a casing string and is made of a material that is softer than that of the casing string. A whipstock assembly is arranged within the casing joint and has a deflector surface operable to direct a drilling assembly into a sidewall of the casing joint to create the casing exit. A wear sleeve is coupled to and extends axially from the whipstock assembly, the wear sleeve defining a throat that extends axially along the axial length of the wear sleeve and transitions into the deflector surface. The axial length of the wear sleeve extends beyond a point of contact where the drilling assembly would otherwise engage the lowside of the casing joint.

    WHIPSTOCK AND DEFLECTOR ASSEMBLY FOR MULTILATERAL WELLBORES
    3.
    发明公开
    WHIPSTOCK AND DEFLECTOR ASSEMBLY FOR MULTILATERAL WELLBORES 审中-公开

    公开(公告)号：EP3114301A4

    公开(公告)日：2017-11-01

    申请号：EP15803813

    申请日：2015-05-07

    申请人： HALLIBURTON ENERGY SERVICES INC

    发明人： DAHL ESPEN ,  TELFER STUART ALEXANDER ,  BRU PEDER ,  LINDLAND FRODE

    IPC分类号： E21B7/08 ,  E21B7/06 ,  E21B17/20 ,  E21B41/00 ,  E21B47/02

    CPC分类号： E21B23/01 ,  E21B7/061 ,  E21B41/0035 ,  E21B43/10

    摘要： A method includes conveying a whipstock and a latch anchor into a parent wellbore, the latch anchor being attached to the whipstock at a releasable connection and the parent wellbore being lined with casing that includes a latch coupling. The latch anchor is secured to the latch coupling and the whipstock is then separated from the latch anchor at the releasable connection and thereby exposing a portion of the releasable connection. The whipstock is then removed from the parent wellbore and a completion deflector is subsequently conveyed into the parent wellbore in combination with lateral tubing (with or without a multilateral junction positioned thereabove), and the completion deflector is attached to the latch coupling at the releasable connection. The lateral tubing (with or without multilateral junction positioned thereabove) is then installed to correct depth.