Methods for stimulation of hydrocarbon-bearing formations while inhibiting corrosion of metal surfaces contacted by acid solutions used in stimulation

1. A method for fracking or stimulation of a hydrocarbon-bearing formation, said method comprising:

providing a wellbore to be stimulated;

inserting a plug in the wellbore at a predetermined location;

inserting a perforating tool having an outside surface and a spearhead acidic composition into the wellbore;

wherein said outside surface of said perforating tool is pre-treated prior to downhole insertion with a grease containing a first corrosion inhibitor component adapted to reduce corrosion inflicted upon it by an exposure to the spearhead acidic composition for a duration of the fracking or stimulation and wherein said spearhead acidic composition comprises a second corrosion inhibitor component which reacts with said first corrosion inhibitor component to generate an active corrosion inhibitor, which forms a protective layer onto said outside surface of said perforating tool;

positioning the perforating tool proximate said predetermined location;

perforating the wellbore with the perforating tool thereby creating a perforated area;

allowing the spearhead acidic composition to come into contact with the perforated area for a predetermined period of time sufficient to prepare the formation for fracking or stimulation;

removing the perforating tool from the wellbore; and

initiating the fracking or stimulation of the perforated area using a fracking fluid.