# US 12,215,279 B2 · Composition for exploiting natural gas hydrates and application method thereof

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- Number: US 12,215,279 B2
- Document ID: US12215279B2
- Status: Granted
- Kind: B2
- Application number: 18/357,077
- Filed: 2023-07-21
- Published: 2023-11-09
- Granted: 2025-02-04
- Earliest claimed: 2022-01-07
- Assignees: Nankai University
- Applicants: Nankai University; Guangzhou Marine Geological Survey; Institute of Exploration Technology, Chinese Academy of Geological Sciences
- Inventors: Xiaohang Liu; Annan Guo; Peng Zhao; Xiaoyang Li; Jinqiang Liang; Wei Huang; Yongqin Zhang
- Web page: https://patentgrep.com/patent/US12215279B2

## CPC

- C09K 8/42: Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K8/50)
- C09K 8/80: Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K 2208/22: Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers
- Y02P 90/70: Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method for administering a composition for exploiting natural gas hydrates. The method includes the following steps: injecting the reagent A into the tube A; injecting the reagent B into the tube B; stretching the tube A and the tube B into a hydrate reservoir by using a reagent injection instrument; regulating a flow rate according to a proportion of each component; allowing the reagents to react at a preset reservoir position; and allowing water in the reservoir to participate in the reaction at the same time, wherein a reaction product is used for supporting the reservoir.

## Claims

### Claim 1

A method for administering a composition for exploiting natural gas hydrates, wherein the composition comprises a reagent A and a reagent B; the method comprises the following steps:
injecting the reagent A into a tube A;
injecting the reagent B into a tube B;
stretching the tube A and the tube B into a hydrate reservoir by using a reagent injection instrument;
regulating a flow rate according to a proportion of each component;
allowing the reagents to react at a preset reservoir position; and
allowing water in the reservoir to participate in the reaction at the same time, wherein a reaction product is used for supporting the reservoir;
wherein the reagent A is PEG400-polyurethane prepolymer;
the reagent B comprises PEG400 and an initiator; a volume ratio of the PEG400-polyurethane prepolymer, the PEG400 and the initiator is (1-3000):(1-1000):(1-2000);
a preparation method of the PEG400-polyurethane prepolymer comprises: mixing PEG400 and cyclohexanone which are separately dehydrated; stirring in an inert protective atmosphere under an acid condition; dropwise adding diphenyl methane diisocyanate; after the dropwise addition, increasing the temperature to 40° C.-70° C., and carrying out a reaction for 2-4 hours to obtain the PEG400-polyurethane prepolymer, wherein a mass ratio of PEG400, cyclohexanone and diphenyl methane diisocyanate is (1-880):(1-1300):(1-1600);
the initiator comprises components by mass percentage:
water: 50-55 wt %,
triethanolamine: 5-10 wt %,
triethylene diamine: 5-10 wt %,
1, 4-butanediol: 20-30 wt %, and
methanol: 5-15 wt %.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the volume ratio of the PEG400-polyurethane prepolymer, the PEG400 in the reagent B and the initiator is (1-800):(1-400):(1-600).

### Claim 3 (depends on 2)

The method according to claim 2, wherein the volume ratio of the PEG400-polyurethane prepolymer, the PEG400 in the reagent B and the initiator is (1-60):(1-20):(1-40).

### Claim 4 (depends on 3)

The method according to claim 3, wherein the volume ratio of the PEG400-polyurethane prepolymer, the PEG400 in the reagent B and the initiator is (1-5):(1-2):(1-4).

### Claim 5 (depends on 1)

The method according to claim 1, wherein the mass ratio of the PEG400, the cyclohexanone and the diphenyl methane diisocyanate is (1-70):(1-120):(1-160).

### Claim 6 (depends on 5)

The method according to claim 5, wherein the mass ratio of the PEG400, the cyclohexanone and the diphenyl methane diisocyanate is (1-4):(2-7):(1-10).