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Natural gas hydrate double-effect inhibitor as well as preparation method and application thereof

A hydrate and natural gas technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of secondary formation of wellbore natural gas hydrate, easy decomposition of hydrate reservoirs, etc., and reduce the formation of secondary hydrate amount, good fluid loss control performance, and the effect of reducing risk

Active Publication Date: 2022-03-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that hydrate reservoirs are easy to decompose due to deep-water low-temperature natural gas hydrate invasion in sea areas, and wellbore natural gas hydrates are prone to secondary formation in drilling wellbores, the present invention provides a method that can simultaneously inhibit the decomposition of reservoir hydrates and inhibit the secondary formation of hydrates in wellbores. A natural gas hydrate double-effect inhibitor with secondary generation function, and a preparation method and application of the double-effect inhibitor are provided

Method used

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  • Natural gas hydrate double-effect inhibitor as well as preparation method and application thereof
  • Natural gas hydrate double-effect inhibitor as well as preparation method and application thereof
  • Natural gas hydrate double-effect inhibitor as well as preparation method and application thereof

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Embodiment 1

[0046] 1. This embodiment provides a method for preparing a natural gas hydrate double-effect inhibitor, and the specific steps are as follows:

[0047](1) Weigh 200g of distilled water into a round-bottomed flask, add a magnetic stirrer and place it on a magnetic stirrer, set the speed at 20 rpm, continue stirring and pass nitrogen gas into the distilled water for deoxygenation:

[0048] Add 34g of N-vinylpyrrolidone dropwise into a round bottom flask to obtain solution a; add methacrylamide aqueous solution to solution a dropwise until the amount of methacrylamide added is 22g to obtain solution b; An aqueous solution of methacrylamide was added dropwise to solution b until the amount of N-methylolacrylamide added was 3 g to obtain solution c;

[0049] (2) After solution c becomes transparent, transfer it into a three-necked flask equipped with a reflux condenser, and add a magnetic stirrer in the three-necked flask, fix it on a water bath rack, adjust the temperature of the...

Embodiment 2

[0055] 1. This embodiment provides a method for preparing a natural gas hydrate double-effect inhibitor, and the specific steps are as follows:

[0056] (1) Weigh 200g of distilled water into a round-bottomed flask, add a magnetic stirrer and place it on a magnetic stirrer, set the speed at 20 rpm, continue stirring and pass nitrogen gas into the distilled water for deoxygenation:

[0057] Add 37g of N-vinylpyrrolidone dropwise into a round bottom flask to obtain solution a; add methacrylamide aqueous solution to solution a dropwise until the amount of methacrylamide added is 13g to obtain solution b; An aqueous solution of methacrylamide was added dropwise to solution b until the amount of N-methylolacrylamide added was 10 g to obtain solution c;

[0058] (2) After waiting for solution c to become transparent, transfer it into a three-necked flask equipped with a reflux condenser, and add a magnetic stirrer in the three-necked flask, fix it on a water bath rack, adjust the te...

Embodiment 3

[0079] This embodiment provides a method for preparing a natural gas hydrate double-effect inhibitor, and the specific steps are as follows:

[0080] (1) Weigh 200g of distilled water into a round-bottomed flask, add a magnetic stirrer and place it on a magnetic stirrer, set the speed at 20 rpm, continue stirring and pass nitrogen gas into the distilled water for deoxygenation:

[0081] Add 37g of N-vinylpyrrolidone dropwise into a round bottom flask to obtain solution a; add methacrylamide aqueous solution to solution a dropwise until the amount of methacrylamide added is 13g to obtain solution b; An aqueous solution of methacrylamide was added dropwise to solution b until the amount of N-methylolacrylamide added was 10 g to obtain solution c;

[0082] (2) After waiting for the solution c to become transparent, transfer it into a three-necked flask equipped with a reflux condenser, and add a magnetic stirrer in the three-necked flask, fix it on a water bath rack, adjust the t...

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Abstract

The invention discloses a natural gas hydrate double-effect inhibitor and a preparation method and application thereof, the natural gas hydrate double-effect inhibitor is generated by a heterocyclic ring-containing terminal alkenyl monomer, a methyl group-containing terminal alkenyl monomer and a hydroxyl group-containing terminal alkenyl monomer through free radical reaction, and the molecular weight of the natural gas hydrate double-effect inhibitor is 2000-3000. The double-effect inhibitor has good generation inhibition performance and decomposition inhibition performance on natural gas hydrates, can effectively prevent reservoir hydrate decomposition caused by drilling fluid entering a reservoir, and meanwhile prevents methane gas generated by decomposition from entering a shaft to generate secondary hydrates to block the shaft. The double-effect inhibitor also can reduce the heat conductivity coefficient of the drilling fluid, inhibits the conduction of heat generated by friction between a drill rod and a stratum to a reservoir, improves the stability of the reservoir, and has a better application prospect in the field of reservoir hydrate development.

Description

technical field [0001] The invention relates to a natural gas hydrate double-effect inhibitor, a preparation method and application thereof, and belongs to the technical field of natural gas hydrate drilling fluids. Background technique [0002] Gas hydrate, also known as combustible ice, is a strategic replacement resource with huge reserves. The total organic carbon content is about twice that of traditional fossil energy, and 97% of it is distributed in sea areas. Gas hydrate reservoirs in sea areas are different from conventional oil and gas reservoirs. During the drilling process, gas hydrates are prone to phase change and decomposition, which leads to easy collapse of the reservoir structure, which in turn causes a series of problems such as wellbore instability, sand production, and landslides; , Gases such as methane generated due to decomposition are easy to generate natural gas hydrate secondary in the wellbore, thereby blocking the wellbore and affecting the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/10C08F220/56C08F220/58C09K8/035C09K8/524
CPCC08F226/10C09K8/035C09K8/524C09K2208/22C08F220/56C08F220/58
Inventor 廖波王金堂吕开河孙金声白英睿黄贤斌金家锋刘敬平黎剑
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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