# US 11,898,098 B2 · Methods for stimulating hydrocarbon-bearing formations

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- Number: US 11,898,098 B2
- Document ID: US11898098B2
- Status: Granted
- Kind: B2
- Application number: 17/824,619
- Filed: 2022-05-25
- Published: 2022-11-17
- Granted: 2024-02-13
- Earliest claimed: 2018-05-11
- Assignees: Dorf Ketal Chemicals Fze
- Applicants: Fluid Energy Group Ltd.
- Inventors: Clay Purdy; Markus Weissenberger
- Web page: https://patentgrep.com/patent/US11898098B2

## CPC

- C09K 8/74: combined with additives added for specific purposes
- C09K 8/032: {Inorganic additives}
- C09K 8/06: Clay-free compositions (containing inorganic compounds only C09K8/05)
- C09K 8/426: {for plugging}
- C09K 8/46: containing inorganic binders, e.g. Portland cement
- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- C09K 8/602: {containing surfactants}
- C09K 8/62: Compositions for forming crevices or fractures
- C23F 11/04: in markedly acid liquids
- E21B 21/00: Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03)
- E21B 41/02: in situ inhibition of corrosion in boreholes or wells
- E21B 43/119: Details, e.g. for locating perforating place or direction
- E21B 43/26: by forming crevices or fractures
- E21B 43/27: by use of eroding chemicals, e.g. acids
- E21B 43/283: {in association with a fracturing process}
- C09K 2208/32: Anticorrosion additives
- E21B 33/12: Packers; Plugs (used for cementing E21B33/134, E21B33/16)
- E21B 43/116: Gun or shaped-charge perforators
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method for the 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 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 stimulation; removing the tool form the wellbore; and initiating the stimulation of the perforated area using a stimulation fluid. Also disclosed is a corrosion inhibiting composition for us with the acid composition.

## Claims

### Claim 1

A method for the fracking or stimulation of a hydrocarbon-bearing formation, said method comprising the steps of:
providing a wellbore and a casing in said wellbore;
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 is in contact with both said perforating tool and casing, and wherein the acidic composition comprises an acid consisting of HCl:alkanolamines;
positioning the perforating tool within the acidic composition near said predetermined location, wherein the acidic composition is in contact with the perforation tool when the acidic composition and the perforating tool are inserted into the wellbore;
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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The method according to claim 1, wherein the acidic composition further comprises a corrosion inhibitor.