Methods of pre-testing expansion charge for selectively expanding a wall of a tubular, and methods of selectively expanding walls of nested tubulars

A method of sealing at least one of a first annulus between an innermost tubular and a nested intermediate tubular, a second annulus between the nested intermediate tubular and a nested outermost tubular, and a third annulus adjacent an outer surface of the nested outermost tubular, the method comprising:

• positioning an expansion tool within the innermost tubular, wherein the expansion tool contains an amount of explosive material based at least in part on a hydrostatic pressure bearing on at least one of the innermost tubular, the nested intermediate tubular, and the nested outermost tubular, wherein the amount of explosive material is for producing an explosive force sufficient to expand, without puncturing, a wall of the innermost tubular, a wall of the nested intermediate tubular, and a wall of the nested outermost tubular;
• and
• actuating the expansion tool once to expand radially outward the wall of the innermost tubular, the wall of the nested intermediate tubular, and the wall of the nested outermost tubular, without perforating or cutting through the wall of the innermost tubular, the wall of the nested intermediate tubular, and the wall of the nested outermost tubular, to form a protrusion of the wall of the innermost tubular that extends into the first annulus between the innermost tubular and the nested intermediate tubular, to form a nested intermediate protrusion of the wall of the nested intermediate tubular that extends into the second annulus between nested intermediate tubular and the nested outermost tubular, and to form a nested outermost protrusion of the wall of the nested outermost tubular that extends into an annulus adjacent the outer surface of the nested outermost tubular.