# US 10,119,065 B2 · Composition for fracturing and displacement and method for fracturing and displacement of tight oil reservoir

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- Number: US 10,119,065 B2
- Document ID: US10119065B2
- Status: Granted
- Kind: B2
- Application number: 15/668,900
- Filed: 2017-08-04
- Published: 2018-08-23
- Granted: 2018-11-06
- Earliest claimed: 2017-02-21
- Assignees: China University of Geosciences (Beijing); China University of Petroleum (East China)
- Applicants: China University of Geosciences (Beijing); China University of Petroleum(East China)
- Inventors: Qing You; Caili Dai; Yan Zhang; Mingwei Zhao; Yining Wu; Guang Zhao; Yongpeng Sun; Huan Wang; Yifei Liu; Jichao Fang
- Web page: https://patentgrep.com/patent/US10119065B2

## CPC

- C09K 8/68: containing organic compounds
- C07D 207/325: with substituted hydrocarbon radicals directly attached to the ring nitrogen atom
- C09K 8/86: containing organic compounds
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The present invention relates to the field of oilfield chemistry, and discloses a composition for fracturing and displacement and a method for fracturing and displacement of a tight oil reservoir. The composition contains a pyrrolic compound represented by formula (1) and a laurate; in the formula (1), M− is halide ion, R1 is C1-C5 linear or branched alkyl, and R2 is C15-C20 linear or branched alkyl. The composition for fracturing and displacement provided in the present invention has functions of fracturing, solid carrying, imbibition, drainage and oil displacement, so as to maximize the recovery efficiency of tight oil, and attain economic and social benefits by implementing multiple functions with a single composition, saving resources, and reducing cost.

## Claims

### Claim 1

A composition for fracturing and displacement, the composition consisting of an aqueous solution of a pyrrolic compound represented by formula (1) and a laurate;
wherein M− is halide ion, R1 is C1-C3 linear alkyl, and R2 is C17-C19 linear alkyl;
wherein the laurate is selected from sodium laurate, potassium laurate, and combinations thereof,
wherein the pyrrolic compound is present in an amount of 0.5 wt % to 10 wt % and the laurate is present in an amount of 0.1 wt % to 2 wt %.

### Claim 2 (depends on 1)

The composition according to claim 1, wherein, M− is bromine ion, R1 is methyl, and R2 is octadecyl.

### Claim 3 (depends on 1)

The composition according to claim 1, wherein, a weight ratio of the pyrrolic compound to the laurate contained is 0.5-20:1.

### Claim 4 (depends on 1)

The composition according to claim 1, wherein water used to form the aqueous solution contains Na+, K+, Ca2+, Mg2+, HCO3 and Cl−, wherein, the total concentration of K+ and Na+ is 1,000 mg/L to 100,000 mg/L, and the total concentration of Ca2+ and Mg2+ is 10 mg/L to 5,000 mg/L.