Methods for spotting acid in a wellbore

Patent metadata

Field	Value
Publication number	US-12152195-B2
Application number	US-202117516214-A
Country	US
Kind code	B2
Filing date	Nov 1, 2021
Priority date	May 11, 2018
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

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.

First claim

The invention claimed is:

1. A method for spotting acid in a wellbore, said method comprising the steps of:
providing said wellbore comprising a casing;
inserting a plug in the wellbore at a predetermined location;
inserting a perforating tool and a breakdown acidic composition into the wellbore; wherein said breakdown acidic composition is in direct contact with both said perforating tool and casing;
positioning the perforating tool within the breakdown acidic composition near said predetermined location;
perforating the wellbore with the perforating tool thereby creating a perforated area and acid soluble debris;
allowing the breakdown acid composition to come into contact with the perforated area and acid soluble debris for a predetermined period of time to prepare the formation for a fracking or stimulation operation; and
where the breakdown acidic composition comprises an acid and a corrosion inhibitor and is balanced to complete the operation of dissolving the acid soluble debris within a time period which will leave the perforating tool with less corrosion damage from exposure to the breakdown acidic composition;
wherein the breakdown acidic composition further includes an acid comprising an HCl:alkanolamine wherein the alkanolamine is selected from the group consisting of: monoethanolamine; diethanolamine; triethanolamine and combinations thereof; and
wherein said breakdown acidic composition has a thermal stability up to 190° C.

2. A method for spotting acid in a wellbore, said method comprising the steps of:
providing said wellbore comprising a casing;
inserting a plug in the wellbore at a predetermined location;
inserting a perforating tool and a breakdown acidic composition into the wellbore; wherein said breakdown acidic composition is in direct contact with both said perforating tool and casing;
positioning the perforating tool within the breakdown acidic composition near said predetermined location;
perforating the wellbore with the perforating tool thereby creating a perforated area and acid soluble debris;
allowing the breakdown acid composition to come into contact with the perforated area and acid soluble debris for a predetermined period of time to prepare the formation for a fracking or stimulation operation; and
where the breakdown acidic composition comprises an acid and a corrosion inhibitor and is balanced to complete the operation of dissolving the acid soluble debris within a time period which will leave the perforating tool with less corrosion damage from exposure to the breakdown acidic composition;
wherein the breakdown acidic composition further includes an acid comprising HCl:monoethanolamine; and
wherein said breakdown acidic composition has a thermal stability up to 190° C.

Assignees

• Fluid Energy Group Ltd
• Dorf Ketal Chemicals Fze

Inventors

• Purdy Clay
• Weissenberger Markus

Classifications

• E21B43/26

  by forming crevices or fractures · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title

• C09K8/602

  containing surfactants · CPC title

• C09K8/032

  Inorganic additives · CPC title

• E21B33/12

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title