# US 12,110,450 B2 · Diverting agent and method of filling fracture in well using same

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- Number: US 12,110,450 B2
- Document ID: US12110450B2
- Status: Granted
- Kind: B2
- Application number: 17/352,693
- Filed: 2021-06-21
- Published: 2021-10-07
- Granted: 2024-10-08
- Earliest claimed: 2018-12-27
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Yasuhiro Hirano; Takahiro Saka; Ryosuke Taniguchi; Chizuko Furo
- Web page: https://patentgrep.com/patent/US12110450B2

## CPC

- C08F 116/06: Polyvinyl alcohol {; Vinyl alcohol}
- C09K 8/5083: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- C08F 8/12: Hydrolysis
- C08F 216/06: Polyvinyl alcohol {; Vinyl alcohol}
- C08F 218/08: Vinyl acetate
- C09K 8/516: characterised by their form or by the form of their components, e.g. encapsulated material
- C09K 8/70: characterised by their form or by the form of their components, e.g. foams
- C09K 8/92: characterised by their form or by the form of their components, e.g. encapsulated material (C09K8/70 takes precedence)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

An object of the present invention is to provide a diverting agent that can exhibit sufficient filling properties against a fracture in a well in an excavation method using a hydraulic fracturing method, and that is excellent in solubility after a predetermined period of time has passed. The diverting agent of the present invention contains a polyvinyl alcohol-based resin having an average polymerization degree of 1000 or more.

## Claims

### Claim 1

A diverting agent, comprising:
a polyvinyl alcohol-based resin having an average polymerization degree of 2800 to 4000; wherein
the polyvinyl alcohol-based resin has a degree of saponification in the range of from 60 mol % to 98.5 mol %, and
the polyvinyl alcohol-based resin is a modified polyvinyl alcohol-based resin, the modified polyvinyl alcohol-based resin being a polyvinyl alcohol-based resin having a primary hydroxy group in a side chain or an ethylene-modified polyvinyl alcohol-based resin.

### Claim 2 (depends on 1)

The diverting agent according to claim 1, wherein the degree of saponification of the polyvinyl alcohol-based resin is in the range of from 90 mol % to 98.5 mol %.

### Claim 3 (depends on 1)

The diverting agent according to claim 1, wherein the polyvinyl alcohol-based resin is contained in an amount of 50 mass % or more.

### Claim 4 (depends on 1)

The diverting agent according to claim 1, wherein the modified polyvinyl alcohol-based resin is the ethylene-modified polyvinyl alcohol-based resin.

### Claim 5 (depends on 1)

The diverting agent according to claim 1, wherein a modification rate of the modified polyvinyl alcohol-based resin is 0.1 mol % to 20 mol %.

### Claim 6 (depends on 1)

A method of temporarily filling a fracture generated in a well, the method comprising:
allowing the diverting agent according to claim 1 to flow into a fracture to be filled with a flow of a fluid in the well.