Use of sulfonic acids in downhole methods

Patent metadata

Field	Value
Publication number	US-11795379-B2
Application number	US-201917054356-A
Country	US
Kind code	B2
Filing date	May 10, 2019
Priority date	May 11, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A novel method for the placement of spearhead acid and stimulation of a hydrocarbon-bearing formation, said method comprising the steps of:
providing a wellbore in need of multiple stages of stimulation; inserting an isolation plug in the wellbore at a predetermined location; inserting a perforating tool and a spearhead or breakdown acid into the wellbore simultaneously exposing the wireline and tool to the acid; 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.

First claim

The invention claimed is:

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.

Assignees

• Fluid Energy Group Ltd
• Dorf Ketal Chemicals Fze

Inventors

• Purdy Clay
• Weissenberger Markus

Classifications

• C09K8/74 Primary

  combined with additives added for specific purposes · CPC title

• C09K8/032

  Inorganic additives · CPC title

• C09K8/06

  Clay-free compositions (containing inorganic compounds only C09K8/05) · CPC title

• C09K8/426

  for plugging · CPC title

• C09K8/46

  containing inorganic binders, e.g. Portland cement · CPC title