# US 10,081,604 B1 · Imidazoline compound, mobility control system, plugging agent for gas channeling, and method for carbon dioxide flooding

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- Number: US 10,081,604 B1
- Document ID: US10081604B1
- Status: Granted
- Kind: B1
- Application number: 15/716,207
- Filed: 2017-09-26
- Granted: 2018-09-25
- Earliest claimed: 2017-07-12
- Assignees: China University of Geosciences (Beijing)
- Applicants: China University of Geosciences (Beijing); China University of Petroleum(East China)
- Inventors: Qing You; Caili Dai; Yan Zhang; Yifei Liu; Jichao Fang; Huan Wang
- Web page: https://patentgrep.com/patent/US10081604B1

## CPC

- C07D 233/14: Radicals substituted by oxygen atoms
- C07D 233/20: with substituted hydrocarbon radicals, directly attached to ring carbon atoms
- C09K 8/594: Compositions used in combination with injected gas {, e.g. CO2 orcarbonated gas}(C09K8/592 takes precedence)
- E21B 43/164: {Injecting CO2 or carbonated water (in combination with organic material C09K8/594)}
- C09K 8/506: containing organic compounds
- G01N 2021/3595: {using FTIR}
- G01R 33/46: NMR spectroscopy
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- 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
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

An imidazoline compound, a mobility control system, a plugging agent for gas channelling, and a method for carbon dioxide flooding. The structure of the imidazoline compound is represented by formula (1), in which R is pentadecyl, heptadecenyl, or heptadecyl. A mobility control system that contains the imidazoline compound can interact with carbon dioxide to form a plugging agent for gas channelling, and thereby attains a plugging effect for carbon dioxide channelling in a carbon dioxide flooding process.

## Claims

### Claim 1

A method for carbon dioxide flooding, comprising: injecting a mobility control system into an oil reservoir, and then injecting carbon dioxide into the oil reservoir for over-displacement; after the mobility control system forms a plugging agent for gas channelling, further injecting carbon dioxide into the oil reservoir for oil displacement, wherein the mobility control system comprising an imidazoline compound, a mobility control additive, and water, the structure of the imidazoline compound is represented by formula (1):
wherein, R is pentadecyl, heptadecenyl or heptadecyl.

### Claim 2 (depends on 1)

The method of claim 1, wherein, the mobility control additive is selected from the group consisting of sodium salicylate, maleic acid, sodium p-toluene sulfonate, and combinations thereof.

### Claim 3 (depends on 2)

The method of claim 2, wherein, R is pentadecyl, and the mobility control additive is sodium p-toluene sulfonate.

### Claim 4 (depends on 1)

The method of claim 1, wherein, in the mobility control system, the content of the imidazoline compound is 1-10 wt %, the content of the mobility control additive is 0.1-2 wt %, and the content of water is 88-98.9 wt %.

### Claim 5 (depends on 4)

The method of claim 4, wherein, in the mobility control system, the content of the imidazoline compound is 2-6 wt %, the content of the mobility control additive is 0.4-0.8 wt %, and the content of water is 93.2-97.6 wt %.

### Claim 6 (depends on 1)

The method of claim 1, wherein, the temperature of the oil reservoir is 40-90° C.