Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking

A method of forming a hydrocarbon-bearing formation for a stimulation operation, the method comprising the steps:

• assessing at least a first location and a second location for perforation of a casing in a wellbore;
• inserting a bottom hole assembly into the wellbore;
• the bottom hole assembly comprising a plug and a perforation tool and the bottom hole assembly being connected to a wireline;
• injecting an acidic composition into the wellbore;
• wherein the acidic composition is in direct contact with the perforation tool, the wireline and the casing;
• positioning and setting the plug in the wellbore at a position downhole but proximate to the first location;
• positioning the perforation tool at the first location;
• perforating the casing at the first location with the perforation tool thereby creating a first perforated area and a first cementitious debris;
• allowing the acidic composition to come into contact with the first perforated area and the first cementitious debris for a predetermined period of time to prepare the formation for the stimulation operation;
• moving the perforation tool up-hole to the second location;
• perforating the casing at the second location with the perforation tool thereby creating a second perforated area and a second cementitious debris;
• allowing the acidic composition to come into contact with the second perforated area and the second cementitious debris for a predetermined period of time to prepare the formation for the stimulation operation;
• removing the perforation tool from the wellbore:
• wherein the acid composition comprises an acid and a corrosion inhibitor composition, the corrosion inhibitor composition comprising:
• an effective amount of an alkenylphenone, and
• an effective amount of polycyclic diquaternary quinoxaline;
• the polycyclic diquaternary quinoxaline having the general structure:
• wherein X− comprises a counter anion,
• R′ comprises an alkyl aryl group, and
• R1, R2, R3, R4 and R5 comprise hydrogen or a substitution group;
• the alkenylphenone having the general structure:
• where R1 is an unsubstituted or an inertly substituted aryl having 6 carbon atoms to 10 carbon atoms, and
• R2 can be a substituted or unsubstituted C1-C6 alkyl group.

An inhibited acid composition compatible with stainless steel tankers for transporting the inhibited acid composition, the composition comprising:

• an acid;
• an effective amount of alkenylphenone;
• an effective amount of polycyclic diquaternary quinoxaline, and
• wherein the inhibited acid composition is transported in stainless steel tankers,
• wherein the alkenylphenone having the general structure:
• where R1 is an unsubstituted or an inertly substituted aryl having 6 carbon atoms to 10 carbon atoms and R2 can be a substituted or unsubstituted C1-C6 alkyl group;
• the polycyclic diquaternary quinoxaline having the general structure:
• wherein X− comprises a counter anion,
• R′ comprises an alkyl aryl group, and
• R1, R2, R3, R4 and R5 comprise hydrogen or a substitution group.