An environmentally friendly natural gas hydrate decomposition inhibitor and its preparation method and application

A technology for decomposing hydrate and natural gas, which is applied in drilling compositions, organic silicon compounds, chemical instruments and methods, etc., can solve the problems that the inhibitory effect needs to be improved, the preparation steps are cumbersome, and it is difficult to degrade. Excellent performance index, enhanced adsorption characteristics, and the effect of inhibiting decomposition

Active Publication Date: 2022-07-19
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, the preparation step of poly-3-methylene 2-pyrrolidone is loaded down with trivial details, needs to use organic solvent, is unfavorable for environmental protection; Used poly-3-methylene 2-pyrrolidone, poly-N-vinyl pyrrolidone are difficult to degrade; And the obtained inhibitor Inhibition effect needs to be improved

Method used

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  • An environmentally friendly natural gas hydrate decomposition inhibitor and its preparation method and application
  • An environmentally friendly natural gas hydrate decomposition inhibitor and its preparation method and application
  • An environmentally friendly natural gas hydrate decomposition inhibitor and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of an environment-friendly natural gas hydrate decomposition inhibitor, comprising the following steps:

[0040] (1) 8g cellulose sample (the ratio of the amount of coupling agent to cellulose monosaccharide unit is 1:10) and 112g deionized water are uniformly mixed at 25°C under the condition that the stirring speed is 200r / min Under stirring for one hour, a cellulose solution was obtained.

[0041] (2) 1.31g of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane and 8.69g of deionized water were uniformly mixed at 25°C, and the stirring speed was 200r / min Under the condition of stirring for half an hour, a silane coupling agent solution was obtained.

[0042] (3) Add 10 g of the silane coupling agent solution obtained in step (2) to the cellulose solution obtained in step (1), stir and mix evenly.

[0043] (4) Glacial acetic acid (AR, purity ≥99.5%) was added dropwise at a rate of one drop every half minute, and the pH of the system was adj...

Embodiment 2

[0047] A preparation method of an environmentally friendly natural gas hydrate decomposition inhibitor, comprising the following steps:

[0048] (1) 4g cellulose sample (the ratio of the amount of coupling agent to cellulose monosaccharide unit is 1:10) and 116g deionized water are uniformly mixed at 25°C under the condition that the stirring speed is 200r / min Under stirring for two hours, a cellulose solution was obtained.

[0049] (2) 0.66g of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane and 9.34g of deionized water were uniformly mixed at 25°C, and the stirring speed was 200r / min Under the condition of stirring for half an hour, a silane coupling agent solution was obtained.

[0050] (3) Add 10 g of the silane coupling agent solution obtained in step (2) to the cellulose solution obtained in step (1), stir and mix evenly.

[0051] (4) Glacial acetic acid (AR, purity ≥99.5%) was added dropwise at a rate of one drop every half minute, and the pH of the system ...

Embodiment 3

[0054] A preparation method of an environmentally friendly natural gas hydrate decomposition inhibitor, comprising the following steps:

[0055] (1) 8g cellulose sample (the ratio of the amount of coupling agent to cellulose monosaccharide unit is 1:10) and 112g deionized water are uniformly mixed at 15°C under the condition that the stirring speed is 300r / min Under stirring for one hour, a cellulose solution was obtained.

[0056] (2) 1.31g of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane was uniformly mixed with 8.69g of deionized water at 25°C, and the stirring speed was 200r / min. The mixture was stirred for half an hour to obtain a silane coupling agent solution.

[0057] (3) Add 10 g of the silane coupling agent solution obtained in step (2) to the cellulose solution obtained in step (1), stir and mix evenly.

[0058] (4) Glacial acetic acid (AR, purity ≥99.5%) was added dropwise at a rate of one drop every half minute, and the pH of the system was adjusted...

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Abstract

The invention provides an environment-friendly natural gas hydrate decomposition inhibitor and a preparation method and application thereof. The natural gas hydrate decomposition inhibitor of the present invention is prepared by dehydration condensation reaction with cellulose after hydrolysis of 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane. The preparation method of the inhibitor of the invention is simple and environmentally friendly; the obtained inhibitor has good biodegradability, can significantly enhance the hydrate decomposition inhibition of the drilling fluid system, and improve the wellbore stability during the drilling process of the hydrate reservoir. Improve the safety of drilling process for hydrate development.

Description

technical field [0001] The invention relates to an environment-friendly natural gas hydrate decomposition inhibitor, a preparation method and application thereof, and belongs to the technical field of marine natural gas hydrate exploitation. Background technique [0002] Gas hydrates are generally distributed in deep-sea sediments and onshore permafrost, and the global reserves of gas hydrates are about 2×10 15 m 3 . Gas hydrates have the potential to be the energy of the future and have attracted great attention in many countries such as the United States, Canada, China, India, Japan, and South Korea. The sedimentary layers where gas hydrates are distributed are usually shallow and low in strength, and hydrates play a role in cementation. In the process of deepwater drilling, it is easy to cause hydrate decomposition, which leads to a significant decrease in the mechanical strength of the reservoir, which can lead to a series of problems such as wellbore instability, san...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06C07F7/08C09K8/035E21B43/01
CPCC08B15/06C07F7/0836C09K8/035E21B43/01C09K2208/22
Inventor 孙金声邵子桦王金堂吕开河王韧白英睿金家锋刘敬平黄贤斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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