# US 10,246,625 B2 · Dispersion solution for drilling and method of extraction using the dispersion solution

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- Number: US 10,246,625 B2
- Document ID: US10246625B2
- Status: Granted
- Kind: B2
- Application number: 15/208,164
- Filed: 2016-07-12
- Published: 2016-11-03
- Granted: 2019-04-02
- Earliest claimed: 2012-12-12
- Assignees: Toyo Seikan Group Holdings, Ltd.
- Applicants: Toyo Seikan Group Holdings, Ltd.
- Inventors: Seishi Yoshikawa
- Web page: https://patentgrep.com/patent/US10246625B2

## CPC

- C09K 8/12: containing synthetic organic macromolecular compounds or their precursors
- C09K 8/035: Organic additives
- C09K 8/68: containing organic compounds
- C09K 8/885: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds}
- E21B 21/003: {Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138)}
- E21B 43/26: by forming crevices or fractures
- E21B 43/267: reinforcing fractures by propping
- C09K 2208/26: Gel breakers other than bacteria or enzymes
- 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 method of extracting underground natural resources through an ore chute located in a temperature region where temperature in the ground is not higher than 60° C., comprising introducing a dispersion solution obtained by dispersing polyoxaylate in water into the ore chute with pressure to hydrolyze the polyoxalate.

## Claims

### Claim 1

A method of extracting underground natural resources through an ore chute located in a temperature region where temperature in the region is not higher than 60° C.,
the method comprising introducing a dispersion solution into the ore chute with pressure,
wherein the dispersion solution is obtained by dispersing, in water, a hydrolyzable resin pellet that contains a polyoxalate having a ratio of decomposition higher than 40% when the pellet is stored for 4 days at 45° C. in distilled water, in order to hydrolyze the hydrolyzable resin pellet to extract underground natural resources.

### Claim 2 (depends on 1)

The method according to claim 1, wherein
the hydrolyzable resin pellet contains a hydrolyzable resin other than the polyoxalate in amount of not more than 60 parts by weight per 100 parts by weight of the polyoxalate.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the hydrolyzable resin other than the polyoxalate is a polylactic acid, a polyhydroxyalkanoate, a polycaprolacone, a polybutylene succinate, a cellulose acetate or a thermoplastic starch.