# US 2019/0169488 A1 · Methods and compositions for stimulating the production of hydrocarbons from subterranean formations

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- Number: US 2019/0169488 A1
- Document ID: US20190169488A1
- Status: Published application
- Kind: A1
- Application number: 16/267,032
- Filed: 2019-02-04
- Published: 2019-06-06
- Earliest claimed: 2013-06-14
- Assignees: Flotek Chemistry, LLC
- Applicants: Flotek Chemistry, LLC
- Inventors: Randal M. Hill; Lakia M. Champagne; Nathan L. Lett; Keith Ingram Dismuke; David Germack; Nicole Mast; Melinda Soeung
- Web page: https://patentgrep.com/patent/US20190169488A1

## CPC

- C09K 8/602: {containing surfactants}
- C09K 8/26: Oil-in-water emulsions
- C09K 8/40: Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
- C09K 8/68: containing organic compounds
- C09K 8/70: characterised by their form or by the form of their components, e.g. foams
- C09K 8/72: Eroding chemicals, e.g. acids
- C09K 8/86: containing organic compounds
- C09K 8/90: of natural origin, e.g. polysaccharides, cellulose
- E21B 43/27: by use of eroding chemicals, e.g. acids
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Methods for treating an oil or gas well having a wellbore and selecting compositions for treating an oil or gas well having a wellbore.

## Claims

### Claim 1

A method of treating a gas well having a wellbore, comprising:
injecting a microemulsion into the wellbore to increase formation gas production by the well, wherein the microemulsion comprises water, a first type of solvent, and a first type of surfactant, wherein the microemulsion includes a continuous water phase,
wherein the first type of solvent is selected from the group consisting of unsubstituted cyclic or acyclic, branched or unbranched alkanes having 6-12 carbon atoms, unsubstituted acyclic branched or unbranched alkenes having one or two double bonds and 6-12 carbon atoms, cyclic or acyclic, branched or unbranched alkanes having 9-12 carbon atoms and substituted with only an —OH group, branched or unbranched dialkylether compounds having the formula CnH2n+1OCmH2m+1, wherein n+m is between 6 and 16, and aromatic solvents having a boiling point between about 300-400° F.

### Claim 2 (depends on 1)

The method of claim 1, wherein the ratio of water to solvent is between about 15:1 and 1:10.

### Claim 3 (depends on 1)

The method of claim 1, wherein the microemulsion further comprises a second type of solvent.

### Claim 4 (depends on 1)

The method of claim 1, wherein the microemulsion is diluted with an aqueous fluid prior to injection into the wellbore.

### Claim 5 (depends on 4)

The method of claim 4, wherein the microemulsion is diluted to between about 0.1 wt % and about 2 wt % versus the total aqueous fluid.

### Claim 6 (depends on 4)

The method of claim 4, wherein the microemulsion is diluted with an aqueous fluid selected from the group consisting of water, brine and a well-treatment fluid.

### Claim 7 (depends on 6)

The method of claim 6, wherein the well-treatment fluid is selected from the group consisting of an acid, a fracturing fluid and slickwater.

### Claim 8 (depends on 1)

The method of claim 1, wherein the microemulsion further comprises a freezing point depression agent.

### Claim 9 (depends on 8)

The method of claim 8, wherein the microemulsion comprises a first type of freezing point depression agent and a second type of freezing point depression agent.

### Claim 10 (depends on 8)

The method of claim 8, wherein the freezing point depression agent is selected from the group consisting of an alkylene glycol, an alcohol, a combination of choline chloride and urea, and a salt.

### Claim 11 (depends on 8)

The method of claim 8, wherein the freezing point depression agent is present in an amount between about 5 wt % and about 40 wt % versus the total microemulsion.

### Claim 12 (depends on 1)

The method of claim 1, wherein the surfactant is an alkyl polyglycol or alkyl polyglucoside nonionic surfactant.

### Claim 13 (depends on 1)

The method of claim 1, wherein the microemulsion further comprises a second type of surfactant.

### Claim 14 (depends on 13)

The method of claim 13, wherein the first type of surfactant is an alkyl polyglycol or alkyl polyglucoside nonionic surfactant and the second type of surfactant is an anionic, cationic, or zwitterionic surfactant.

### Claim 15 (depends on 1)

The method of claim 1, wherein the first type of surfactant is present in an amount between about 15 wt % and 55 wt % versus the total microemulsion.