Patent ID: 6533040
Filing Date: 2003-03-18
Classification: E21B

Abstract:
A pre-fabricated liner stub assembly for adding and bonding a liner stub tubular connector to an existing cemented casing of a well at a subsurface location, said assembly comprising:an assembly housing, a two-ended liner stub within said housing, said liner stub having an upper and a lower end and including a collar affixed to a selected end of said liner stub, a pre-fabricated template within said housing, said template having a shape closely matching the shape of said selected end of said liner stub and the shape of the interior surface of said existing cemented casing, means cooperating with said assembly for pressing said template against the inner surface of said existing cemented casing at said subsurface location, first explosive means attached to said template for cutting an elongated casing window cut-out opening in said existing casing, means for guiding and applying said selected end of said liner stub and said collar against said elongated casing window cut-out opening in said existing casing, second explosive means associated with said collar for bonding said collar and said liner stub to said elongated casing window cut-out opening in said existing casing, and third explosive means for cutting and folding the remnant debris of said casing and said template produced during explosive cutting of said elongated casing window cut-out opening and said explosive bonding of said collar and said liner stub into said window and within said liner stub.