Use of sulfonic acids in downhole methods

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

providing a wellbore in need of stimulation;

inserting a plug in the wellbore at a location slightly beyond a predetermined location;

inserting a perforating tool and a spearhead or breakdown aqueous acidic composition into the wellbore, wherein the aqueous acidic composition comprises quaternary amines, acetylenic alcohols, prop-2-yn-1-ol, naphthalene, aliphatic hydrocarbons, and propane-2-ol;

positioning the tool at said predetermined location;

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

allowing the spearhead acid 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 tool form the wellbore; and

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

2. The method according to claim 1 , wherein the acidic composition further comprises a sulfonic acid selected from the group consisting of: methanesulfonic acid; ethanesulfonic acid; propanesulfonic acid toluenesulfonic acid; and sulfamic acid.

3. The method according to claim 1 , wherein the aqueous acidic composition further comprises a corrosion inhibitor adapted to prevent damaging corrosion to the tool during the period of exposure with said tool.

4. A method according to claim 3 , where the aqueous acidic composition further comprises a corrosion inhibitor package selected from the group consisting of:

(a) a mixture containing quaternary ammonium salts (11-30 wt. %), benzyl chloride quaternary ammonium compound (11-30 wt. %), propargyl alcohol (1-10 wt. %), dimethyl formamide (1-10 wt. %), cuprous iodide (1-10 wt. %), ethoxylated nonylphenol (1-10 wt. %), and isopropa-nol solvent (10-30 wt. %); and

(b) a mixture containing quaternary amines (10-20 wt. %), formamide (20-40 wt. %), acetylenic alcohols (5-10 wt. %), 2-propyn-1-ol (5-10 wt. %), ethoxylated nonylphenol (5-10 wt. %), pine oil (1-5 wt. %), and methanol and isopropanol sol-vent (20-40 wt. %).

5. The method according to claim 1 , wherein the tool is a perforating gun.

6. An integrated method for the perforating a casing and cleaning up debris inside or near a wellbore, said method comprising the steps of:

providing a wellbore having a casing;

inserting a zonal isolation plug, a perforating tool and a spearhead or breakdown aqueous acidic composition into the wellbore, wherein the aqueous acidic composition comprises quaternary amines, acetylenic alcohols, prop-2-yn-1-ol, naphthalene, aliphatic hydrocarbons, and propane-2-ol;

securing the plug in the wellbore at a location slightly beyond but proximate to a predetermined location;

positioning the perforating tool at said predetermined location;

perforating the wellbore with the perforating tool thereby creating a perforated area in the casing and cement allowing access to the formation; and

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

7. A method to perform a downhole operation of drilling with acid to increase a rate of penetration (ROP) through cement plugs or carbonate-based formation, said method comprises the following steps:

inserting a drilling tool inside a wellbore;

injecting an aqueous acidic composition into the wellbore concurrently with the drilling tool, wherein the aqueous acidic composition comprises quaternary amines, acetylenic alcohols, prop-2-yn-1-ol, naphthalene, aliphatic hydrocarbons, and propane-2-ol;

position the drilling tool within the wellbore at a point requiring drilling;

contacting the surface requiring drilling with the acid and begin drilling;

continue the drilling operation until desired distance has been achieved; and

where the aqueous acidic composition is sufficiently balanced to complete the operation of dissolving the acid soluble debris within a time period which will leave said tool with acceptable corrosion damage from exposure to the acidic composition.