US 12,215,279 B2
Composition for exploiting natural gas hydrates and application method thereof
Xiaohang Liu, Tianjin (CN); Annan Guo, Cangzhou (CN); Peng Zhao, Tianjin (CN); Xiaoyang Li, Langfang (CN); Jinqiang Liang, Guangzhou (CN); Wei Huang, Guangzhou (CN); and Yongqin Zhang, Langfang (CN)
Assigned to Nankai University, Tianjin (CN)
Filed by Nankai University, Tianjin (CN); Guangzhou Marine Geological Survey, Guangzhou (CN); and Institute of Exploration Technology, Chinese Academy of Geological Sciences, Langfang (CN)
Filed on Jul. 21, 2023, as Appl. No. 18/357,077.
Application 18/357,077 is a division of application No. 18/145,133, filed on Dec. 22, 2022, granted, now 11,760,923.
Claims priority of application No. 202210017030.8 (CN), filed on Jan. 7, 2022.
Prior Publication US 2023/0357628 A1, Nov. 9, 2023
Int. Cl. C09K 8/80 (2006.01)
CPC C09K 8/80 (2013.01) 6 Claims
OG exemplary drawing
 
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 %.