Patent ID: 6244337
Filing Date: 2001-06-12
Classification: E21B

Abstract:
A system for sealing the intersection between a primary borehole and a branch borehole, comprisinga primary casing section which in use is located in the primary borehole in the region of the branchpoint;a branch casing section which in use is located in the branch borehole; anda wedge-shaped element which in use is located in the primary well adjacent to the primary casing section such that a slant surface at one end of the wedge-shaped element faces the slant surface of the primary casing section;wherein the branch casing section is secured to the primary casing section and the primary casing section is tubular and defines a slant surface which is adapted to cooperate with a slant surface of a wedge-shaped element; andwherein the slant surfaces of the primary casing section and of the wedge-shaped element have steps that allow one member to ratchet into engagement with a corresponding member.