to take place thus saving rig time because a separate acidifying operation is not necessary it is also safer than an acidifying operation because the perforating gun comprising the shaped charge of the invention is safer to manipulate by an operator than implementing an acidifying operation from the surface which involves the injection of liquid acid when the liner further comprises particular materials like metals oxidizing or reducing agent as described hereinbefore the cleaning effect may be further enhanced and additional formation fracturing effect may occur the fracturing effect is mainly due to thermal stress created by the exothermic reactions between these particular materials and a formation substantially made of carbonate the shaped charge of the invention may be manufactured according to existing techniques known by the person skilled in the art that will not be further described the drawings and their description hereinbefore illustrate rather than limit the invention in particular the invention has been described in relation with the perforation of a cased well however a person skilled in the art would recognize that the invention is also applicable to a non cased well further the invention is not limited to the particular example of the onshore hydrocarbon well application and may be used in an offshore application furthermore the application to oilfield industry is not limitative as the invention may be used in others geophysical applications water extraction co 2 geological storage etc finally the description of.