DUEL END FIRING EXPLOSIVE COLUMN TOOLS AND METHODS FOR SELECTIVELY EXPANDING A WALL OF A TUBULAR

摘要

A method of selectively expanding a wall of a tubular includes assembling an expansion tool comprising a plurality of bi-directional boosters, arranging a predetermined number of explosive pellets on the guide tube to be in a serially-arranged column between the bi-directional boosters, positioning a duel end firing explosive column tool within the tubular, and detonating the bi-directional boosters to simultaneously ignite opposing ends of the serially-arranged column to form two shock waves. The shock waves collide to create an amplified shock wave that travels radially outward to impact the tubular and expand a portion of the tubular wall radially outward, without perforating or cutting through the portion of the wall, to form a protrusion of the tubular at the portion of the wall. The protrusion extends into an annulus between an outer surface of the wall of the tubular and an inner surface of a wall of another tubular.