A well tool for generating a shaped perforation in a cased wellbore includes a tool body. The told body has at least one wall, a fluid channel, a first perforation device, and a second perforation device. The at least one wall defines an opening and an interior volume. The fluid channel extends from the opening of the at least one wall into the interior volume. The first perforation device is configured to form a perforation tunnel in the cased wellbore disposed in a formation. The second perforation device is coupled to the first perforation device and to the fluid channel. The second perforation device is configured to form the shaped perforation in the formation by flowing fluid received through the fluid channel to the formation through the perforation tunnel.