Method of creating a plurality of longitudinally separated circumferential dents in a wellbore tubular

A method of creating a plurality of longitudinally separated circumferential dents in a wellbore tubular, comprising:

• providing a tool having a longitudinal tool axis and comprising at least a first charge housing and a second charge housing mechanically interconnected to each other by a longitudinal connecting rod, whereby the first and second charge housings are separated from each other over a separation distance along the longitudinal tool axis, and wherein each of the first and second charge housings comprises at least one shaped charge;
• inserting the tool in a wellbore tubular to a desired location within the wellbore tubular;
• while the tool is inside the wellbore tubular, simultaneously detonating the at least one shaped charge in each of the at least two charge housings, whereby generating a first radial pressure wave from the first charge housing, in a first plane transverse to the longitudinal tool axis, and a first axial pressure wave propagating along the longitudinal tool axis toward the second charge housing, and whereby generating a second radial pressure wave from the second charge housing, in a second plane transverse to the longitudinal tool axis, and a second axial pressure wave propagating along the longitudinal tool axis toward the first charge housing;
• whereby the first radial pressure wave causes a first circumferential dent in the wellbore tubular and whereby the second radial pressure wave causes a second circumferential dent in the wellbore tubular, and whereby the first and second axial pressure waves collide and thereby cause a third circumferential dent between the first and second circumferential dents.