Natural gas hydrate inhibitor, natural gas hydrate compounding inhibitor, and preparation methods of natural gas hydrate inhibitor and natural gas hydrate compounding inhibitor

A technology for hydrate inhibitor and natural gas, which is applied in drilling compositions, chemical instruments and methods, gas/liquid distribution and storage, etc., can solve problems such as insufficient inhibition ability, and achieve long-term inhibition and improved inhibition performance. Effect

Active Publication Date: 2019-11-19
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kinetic inhibitors have the advantages of small dosage and high performance, but in the face of complex field conditions in oil and gas fields, they still show insufficient inhibitory ability and cannot be applied in actual production on a large scale. Therefore, it is necessary to improve kinetic hydrate inhibitors

Method used

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  • Natural gas hydrate inhibitor, natural gas hydrate compounding inhibitor, and preparation methods of natural gas hydrate inhibitor and natural gas hydrate compounding inhibitor
  • Natural gas hydrate inhibitor, natural gas hydrate compounding inhibitor, and preparation methods of natural gas hydrate inhibitor and natural gas hydrate compounding inhibitor

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Effect test

Embodiment 1

[0044] A kind of preparation method of natural gas hydrate inhibitor of the present invention specifically comprises the following steps,

[0045] Step 1, add monomer N-vinylcaprolactam and N-isopropylacrylamide into deionized water, stir well and then add initiator azobisisobutyronitrile, these two monomers undergo free radical reaction in deionized water Polymerization;

[0046] Wherein, the mass ratio of the mass sum of two monomers to deionized water is 1:20, the mass ratio of monomer N-vinylcaprolactam and N-isopropylacrylamide is 3:1, and the mass ratio of initiator 1% of the sum of the mass of the two monomers, the reaction temperature of the radical polymerization reaction is 50°C, and the reaction time is 10h;

[0047] Step 2, after the reaction is completed, the reaction solution is filtered to obtain a solid product;

[0048] Step 3, put the obtained product into a beaker with a magnet, pour a certain amount of deionized water, wherein the mass ratio of deionized ...

Embodiment 2

[0055] A kind of preparation method of natural gas hydrate inhibitor of the present invention specifically comprises the following steps,

[0056] Step 1, add the monomers N-vinylcaprolactam and N-ethylacrylamide into deionized water, stir well and then add the initiator azobisisobutyronitrile, the two monomers undergo free radical polymerization in deionized water reaction;

[0057] Wherein, the mass ratio of the mass sum of the two monomers to deionized water is 1:22, the mass ratio of the monomer N-vinyl caprolactam and N-ethylacrylamide is 1:1, and the mass of the initiator is 3% of the mass sum of the two monomers, the reaction temperature of the radical polymerization reaction is 60°C, and the reaction time is 8h;

[0058] Step 2, after the reaction is completed, the reaction solution is filtered to obtain a solid product;

[0059] Step 3, put the obtained product into a beaker with a magnet, pour a certain amount of deionized water, wherein the mass ratio of deionized...

Embodiment 3

[0065] A kind of preparation method of natural gas hydrate inhibitor of the present invention specifically comprises the following steps,

[0066] Step 1, add monomer N-vinylcaprolactam and N,N dimethylacrylamide into deionized water, stir well and then add initiator azobisisobutyronitrile, these two monomers are free in deionized water radical polymerization;

[0067] Wherein, the mass ratio of the mass sum of the two monomers to deionized water is 1:25, the mass ratio of the monomer N-vinyl caprolactam and N,N dimethylacrylamide is 9:1, and the mass ratio of the initiator The mass is 4% of the sum of the masses of the two monomers, the reaction temperature of the radical polymerization reaction is 90°C, and the reaction time is 4h;

[0068] Step 2, after the reaction is completed, the reaction solution is filtered to obtain a solid product;

[0069] Step 3, put the obtained product into a beaker with a magnet, pour a certain amount of deionized water, wherein the mass rati...

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Abstract

The invention relates to a natural gas hydrate inhibitor, a natural gas hydrate compounding inhibitor, and preparation methods of the natural gas hydrate inhibitor and the natural gas hydrate compounding inhibitor. The preparation method of the natural gas hydrate inhibitor comprises: 1, dissolving N-vinyl caprolactam and an amide-containing monomer in deionized water to obtain a mixed solution A;2, carrying out a reaction on the mixed solution A and azobisisobutyronitrile for 4-10 h at a temperature of 50-90 DEG C, and filtering the obtained reaction solution to obtain a product; and 3, removing impurities from the product, and drying to obtain the natural gas hydrate inhibitor. The preparation method of the natural gas hydrate compounding inhibitor comprises: 1, preparing a natural gashydrate inhibitor aqueous solution with a mass fraction of not more than 5% from the natural gas hydrate inhibitor; and 2, adding a thermodynamic inhibitor to the aqueous solution according to a massratio of the thermodynamic inhibitor to the water of less than or equal to 5% to obtain the natural gas hydrate compounding inhibitor. According to the present invention, the inhibitor can significantly improve the inhibitory performance on natural gas hydrates, and the compounding inhibitor can enhance the inhibitory performance of hydrate inhibitors so as to achieve good inhibitory effect at a high under-cooling-degree.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field additives, in particular to a natural gas hydrate inhibitor, a compound inhibitor and a preparation method thereof. Background technique [0002] In oil and gas extraction and transportation, especially under low temperature and high pressure conditions, gas molecules in natural gas can combine with water to form ice-like crystals, called natural gas hydrates. In 1930, Hammerschmidt discovered the phenomenon of natural gas hydrates clogging natural gas transportation pipelines and gas wells, and the problem of natural gas hydrates gradually attracted close attention from the industry. The huge troubles caused by natural gas hydrates to oil and gas production have become an urgent problem to be solved. There are four main ways to inhibit the formation of natural gas hydrates. 1. Remove moisture from natural gas; 2. Heat the pipeline, because natural gas hydrates are likely to form below ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/06C08F220/54C09K8/52F17D1/16
CPCC08F220/54C08F226/06C09K8/52C09K2208/22F17D1/16
Inventor 郝红杨文阁樊安段延萍赵夏张冰冰薛甲
Owner NORTHWEST UNIV(CN)
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