# US 2021/0340433 A1 · Acid emulsifier technology for continuous mixed emulsified acid systems

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- Number: US 2021/0340433 A1
- Document ID: US20210340433A1
- Status: Published application
- Kind: A1
- Application number: 16/341,569
- Filed: 2017-09-01
- Published: 2021-11-04
- Earliest claimed: 2016-10-16
- Assignees: The Lubrizol Corporation
- Applicants: The Lubrizol Corporation
- Inventors: Kern L. Smith; Nicole Shimek; Nadia M. Mojica
- Web page: https://patentgrep.com/patent/US20210340433A1

## CPC

- C09K 8/528: inorganic depositions, e.g. sulfates or carbonates
- C09K 8/725: {Compositions containing polymers}
- C09K 8/524: organic depositions, e.g. paraffins or asphaltenes
- C09K 8/54: Compositions for in situ inhibition of corrosion in boreholes or wells
- C09K 8/602: {containing surfactants}
- C09K 8/604: {Polymeric surfactants}
- C09K 8/74: combined with additives added for specific purposes
- C09K 8/82: Oil-based compositions (C09K8/64 takes precedence)
- E21B 43/27: by use of eroding chemicals, e.g. acids
- C09K 2208/12: Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
- C09K 2208/20: Hydrogen sulfide elimination
- C09K 2208/28: Friction or drag reducing additives
- C09K 2208/32: Anticorrosion additives
- 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

In one embodiment, the present technology provides a surfactant composition comprising an imide compound in an optional solvent for use in a hydrocarbon base fluid to improve the emulsification of an acidizing agent in the hydrocarbon base fluid. In another embodiment, the present technology provides a method of employing an acidizing well-bore stimulation fluid containing the surfactant composition to stimulate a reservoir.

## Claims

### Claim 1

An acidizing well-bore stimulation fluid comprising an oil external emulsion of
i. a hydrocarbon base fluid,
ii. an acidizing agent, and
iii. a surfactant comprising
1. an imide compound that is the reaction product of
a. a hydrocarbyl-substituted acylating agent, and
b. a nitrogen containing compound having a nitrogen atom capable of reacting with said hydrocarbyl-substituted acylating agent comprising at least one of
(A) a compound of formula
(B) a compound of formula
(C) mixtures of (A) or (B), and
2. a hydrocarbon solvent.

### Claim 2 (depends on 1)

The well-bore stimulation fluid of claim 1, wherein the acidizing agent further comprises additional additives, such as an acid corrosion inhibitor, acid corrosion intensifier, iron control agent, hydrogen sulfide scavenger, acid gelling agent, friction reducer, scale inhibitor, clay control agent and other surface active agents.

### Claim 3 (depends on 2)

The well-bore stimulation fluid of claim 2, wherein the acidizing agent comprises an inorganic acid, an organic acid or combinations thereof.

### Claim 4 (depends on 3)

The well-bore stimulation fluid of claim 3, wherein the acidizing agent comprises hydrochloric acid (HCl), hydrofluoric acid (HF), sulfamic acid, urea hydrochloride, formic acid, acetic acid, citric acid, lactic acid, glycolic acid or combinations thereof.

### Claim 5 (depends on 1)

The well-bore stimulation fluid of claim 1 wherein the acid is present in the acidizing well-bore stimulation fluid in an amount of about 55% to about 90% by volume based on the total volume of the well-bore stimulation fluid.

### Claim 6 (depends on 1)

The well-bore stimulation fluid of claim 1, where the hydrocarbyl substituent of the hydrocarbyl-substituted acylating agent has a number average molecular weight of from about 100 to about 5000.

### Claim 7 (depends on 1)

The well-bore stimulation fluid of claim 1, wherein the hydrocarbyl substituent of the hydrocarbyl-substituted acylating agent comprises a polyolefin.

### Claim 8 (depends on 7)

The well-bore stimulation fluid of claim 7, wherein the polyolefin is polyisobutylene.

### Claim 9 (depends on 1)

The well-bore stimulation fluid of claim 1 wherein the acylating agent of the hydrocarbyl-substituted acylating agent comprises fumaric acid, itaconic acid, maleic acid, or combinations thereof.

### Claim 10 (depends on 1)

The well-bore stimulation fluid of claim 1, wherein the hydrocarbyl-substituted acylating agent is polyisobutenyl succinic anhydride or polyisobutenyl succinic acid.

### Claim 11 (depends on 1)

The well-bore stimulation fluid of claim 1, wherein the nitrogen containing compound comprises an aliphatic hydrocarbyl-amine.

### Claim 12

(canceled)

### Claim 13 (depends on 1)

The well-bore stimulation fluid of claim 1, wherein the nitrogen containing compound comprises dimethylaminopropylamine.

### Claim 14 (depends on 1)

The well-bore stimulation fluid according to claim 1, wherein the hydrocarbon base fluid comprises at least one of crude oil, diesel fuel (including biodiesel), gasoline, xylene, or some other hydrocarbon fluid such as kerosene, xylene, d-limonene, naptha or solvent naptha, such as mineral spirits, carbon tetrachloride, or combinations thereof.

### Claim 15 (depends on 1)

The well-bore stimulation fluid according to claim 1, wherein the hydrocarbon base fluid contains the emulsifying surfactant and further comprises additional additives, such as a viscosifying agent, friction reducer, paraffin inhibitor or dispersant, and other surface active agents.

### Claim 16 (depends on 1)

The well-bore stimulation fluid according to claim 1, wherein the hydrocarbon solvent comprises at least one of crude oil, diesel fuel (including biodiesel), gasoline, xylene, or some other hydrocarbon fluid such as kerosene, xylene, d-limonene, naptha or solvent naptha, such as mineral spirits, carbon tetrachloride, or combinations thereof.

### Claim 17 (depends on 1)

The well-bore stimulation fluid according to claim 1 wherein the concentration of the surfactant in the hydrocarbon fluid is from about 0.01% by volume to about 2% by volume.

### Claim 18 (depends on 1)

The well-bore stimulation fluid according to claim 1 wherein the ratio of the imide to the hydrocarbon solvent in the surfactant is from about 1:1 to about 1:0.

### Claim 19

A method of emulsifying an acidizing agent in a hydrocarbon fluid, comprising the steps of:
a. adding to the hydrocarbon fluid a surfactant comprising
i. an imide compound that is the reaction product of
1. a hydrocarbyl-substituted acylating agent, and
2. a nitrogen containing compound having an oxygen or nitrogen atom capable of reacting with said hydrocarbyl-substituted acylating agent comprising at least one of
(A) a compound of formula
(B) a compound of formula
(C) mixtures of (A) or (B), and
ii. a hydrocarbon solvent; and
b. adding an acidizing agent to the hydrocarbon fluid.

### Claim 20 (depends on 19)

The method of emulsifying an acid according to claim 19 in a hydrocarbon fluid, further comprising the step of mixing the hydrocarbon fluid containing the surfactant, and the acidizing agent.

### Claim 21 (depends on 19)

The method of emulsifying an acid according to claim 19 in a hydrocarbon fluid further comprising mixing the hydrocarbon fluid containing the surfactant and acidizing agent for less than 60 seconds.

### Claim 22 (depends on 19)

The method of emulsifying an acid according to claim 19 in a hydrocarbon fluid wherein the addition of the surfactant is completed on-the-fly.

### Claim 23 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)

A method of stimulating a well-bore comprising
a. preparing a well-bore stimulation fluid as claimed in any of claims 1 to 13, followed by
b. pumping the well-bore stimulation fluid down the well-bore.

### Claim 24 (depends on 23)

The method of claim 23, wherein the method is performed at a well-bottom temperature of up to 500° F.

### Claim 25 (depends on 23)

The method of claim 23, wherein the well-bore comprises carbonate rock.

### Claim 26 (depends on 23)

The method of claim 23 additionally comprising the step of adding a viscosifying agent to the well-bore.