Patent ID: 7011151
Filing Date: 2006-03-14
Classification: E21B

Abstract:
1. Downhole apparatus for sealing a junction between a main borehole and a lateral borehole, the apparatus comprising: a first component formed by a tubular liner for lining a portion of the lateral borehole adjacent the main borehole, and a flange element secured to the tubular liner, the flange element having a curved surface for location in abutment with an area of a main borehole wall surrounding the entrance to the lateral borehole; and a second component locatable in the main borehole to lock the first component in a use position in which said curved surface of the first component is held in abutment with said area of the main borehole wall, the second component comprising a cylindrical member having a cylindrical outer face for engaging an inner face of the flange element of the first component to lock the first component in said use position, an aperture being formed in the cylindrical member corresponding to a position of the tubular liner to provide entry into the tubular liner from the main borehole, wherein said flange element is elongate in shape and one end thereof is provided with an edge profile, said cylindrical member having a projection for abutment with said edge profile.