Explosive downhole tools having improved wellbore conveyance and debris properties, methods of using the explosive downhole tools in a wellbore, and explosive units for explosive column tools

A method comprising:

• assembling an explosive expansion tool, wherein the explosive expansion tool is liner-less to permit expanding, without puncturing, a diameter of a wall of a downhole tubular, and wherein the assembling of the explosive expansion tool comprises:
• attaching a first plurality of explosive sections to each other to form a first explosive unit, wherein each of the first plurality of explosive sections comprises explosive material, and wherein the first explosive unit has a truncated cone shape;
• attaching a second plurality of explosive sections to each other to form a second explosive unit, wherein each of the second plurality of explosive sections comprises explosive material, and wherein the second explosive unit has a truncated cone shape;
• and
• positioning the first explosive unit and the second explosive unit against each other to form a shaped charge assembly of the explosive expansion tool;
• positioning the shaped charge assembly within a housing assembly, wherein the housing assembly comprises an upper housing section and a lower housing section, wherein a majority of an outer surface of at least one of the upper housing section and the lower housing section in cross-section is rounded so as to be devoid of corners;
• and
• loading the explosive unit onto the explosive expansion tool.

An explosive expansion tool comprising:

• a housing comprising:
• an upper housing section;
• a lower housing section;
• and
• a window section between the upper housing section and the lower housing section, wherein each of the upper housing section and the lower housing section comprises an outer surface that faces away from the housing, and wherein a majority of the outer surface of at least one of the upper housing section and the lower housing section in cross-section is rounded so as to be devoid of corners;
• and
• an explosive charge configured to expand, without puncturing, a wall of a downhole tubular when detonated, wherein the explosive charge comprises an upper explosive unit and a lower explosive unit, and wherein each of the upper explosive unit and the lower explosive unit is divided into two or more sections that are attached to each other.