Methods for stimulating hydrocarbon-bearing formations
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 predetermined location; inserting a perforating tool and a spearhead or breakdown acid into the wellbore; 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 of the perforated area using a fracking fluid. Also disclosed is a corrosion inhibiting composition for us with the acid composition.
1. A method for the fracking or stimulation of a hydrocarbon bearing formation, said method comprising the steps of:
providing a wellbore having a casing;
inserting a plug in the wellbore at a predetermined location;
inserting a perforating tool and an acidic composition into the wellbore, wherein said acidic composition comprises a corrosion inhibiting composition comprising a terpene, an amphoteric surfactant, and a solvent, and wherein said acidic composition is in direct contact with both said perforating tool and casing;
positioning the perforating tool within the acidic composition near said predetermined location;
perforating the wellbore with the perforating tool thereby creating a perforated area and acid soluble debris;
allowing the acidic composition to come into contact with the perforated area and acid soluble debris for a predetermined period of time to prepare the formation for the stimulation;
removing the perforating tool from the wellbore; and
initiating the fracking or stimulation of the perforated area using a stimulation fluid.
2. The method of claim 1 , wherein the corrosion inhibiting composition is adapted to prevent damaging corrosion to the perforating tool, a wire-line and casing during exposure with said acidic composition.
3. The method according to claim 1 , wherein the perforating tool is a perforating gun.
4. The method according to claim 1 , wherein the acidic composition is selected from the group consisting of: mineral acids; organic acids; synthetic acids; and combinations thereof.
5. The method according to claim 1 , wherein the acidic composition is selected from the group consisting of: HCl; methanesulphonic acid; toluenesulfonic acid; sulfamic acid; HCl:amino acid; HCl:alkanolamine.
6. The method according to claim 5 , wherein the amino acid is selected from the group consisting of: lysine; lysine monohydrochloride; alanine; asparagine; aspartic acid; cysteine; glutamic acid; histidine; leucine; methionine; proline; serine; threonine; valine; and combinations thereof.
7. The method according to claim 5 , wherein the alkanolamine is selected from the group consisting of: monoethanolamine; diethanolamine; triethanolamine and combinations thereof.
8. The method according to claim 1 wherein said corrosion inhibiting composition comprises citral and/or cinnamaldehyde.
9. The method according to claim 1 wherein said corrosion inhibiting composition further comprises at least one anionic surfactant.
10. The method according to claim 1 wherein said solvent is isopropanol.
11. The method according to claim 1 wherein said terpene is citral.