# US 2021/0277301 A1 · Fracturing fluid composition and method for in situ generation of geomimetic crystal network proppants

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- Number: US 2021/0277301 A1
- Document ID: US20210277301A1
- Status: Published application
- Kind: A1
- Application number: 17/190,307
- Filed: 2021-03-02
- Published: 2021-09-09
- Earliest claimed: 2020-03-05
- Assignees: Ypf TecnologíA S.A.
- Applicants: Ypf TecnologíA S.A.
- Inventors: Augusto Nicolás VARELA; Remigio RUIZ; Paula Cecilia DOS SANTOS CLARO
- Web page: https://patentgrep.com/patent/US20210277301A1

## CPC

- C09K 8/703: {Foams}
- C09K 8/665: {containing inorganic compounds (proppants C09K8/80)}
- C09K 8/68: containing organic compounds
- E21B 43/26: by forming crevices or fractures
- 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

A composition for fracking an unconventional reservoir comprising hard water and liquid carbon dioxide that allows in-situ generation of proppant particles, thereby keeping open a larger volume of fractures, as well as increasing hydraulic fracture conductivity, thereby enhancing well production. The composition can act as a triple agent a fracture agent, a carrier agent and a proppant agent. A method for fracturing a rock formation in an unconventional reservoir at high temperature and pressure conditions.

## Claims

### Claim 1

A composition for fracking an unconventional reservoir, wherein the composition comprises hard water and liquid carbon dioxide.

### Claim 2 (depends on 1)

The composition according to claim 1, wherein the composition further comprises a carboxamide.

### Claim 3 (depends on 2)

The composition according to claim 2, wherein the carboxamide is selected from urea, formamide, acetamide, benzamide and N,N-dimethylformamide.

### Claim 4 (depends on 3)

The composition according to claim 3, wherein the carboxamide is urea.

### Claim 5 (depends on 1)

The composition according to claim 1, wherein the ratio of hard water to carbon dioxide is of 7:3 to 9.5:0.5 in volume.

### Claim 6 (depends on 1)

The composition according to claim 1, wherein the carboxamide is at a concentration of about 30 g/L to 80 g/L in the composition.

### Claim 7 (depends on 1)

A method for fracturing a rock formation in an unconventional reservoir, wherein the method comprises pumping a composition according to claim 1 into the rock formation.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the composition is pumped at a temperature between 80 and 120° C.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the composition is pumped at a temperature of 110° C.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the composition is pumped at a pressure between 300 and 750 bar.