Composition for exploiting natural gas hydrates and application method thereof

Patent metadata

Field	Value
Publication number	US-12215279-B2
Application number	US-202318357077-A
Country	US
Kind code	B2
Filing date	Jul 21, 2023
Priority date	Jan 7, 2022
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

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.

First claim

We 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 %.

2. 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).

3. 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).

4. 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).

5. 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).

6. 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).

Assignees

• Univ Nankai
• Guangzhou Marine Geological Survey
• Institute Of Exploration Tech Chinese Academy Of Geological Sciences

Inventors

• Liu Xiaohang
• Guo annan
• Zhao Peng
• Li Xiaoyang
• Liang Jinqiang
• Huang Wei
• Zhang Yongqin

Classifications

• C09K2208/22

  Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers · CPC title

• Y02P90/70

  Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells · CPC title

• E21B43/16

  Enhanced recovery methods for obtaining hydrocarbons · CPC title

• C09K8/80 Primary

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C09K8/42 Primary

  Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K8/50) · CPC title