Hydrate inhibitor as well as preparation method and application thereof

A technology of hydrate inhibitor and dispersant, which is applied in the field of oil and gas fields, can solve the problems of limited inhibitory effect, achieve obvious inhibitory effect, less environmental hazards, and enhance solubility

Active Publication Date: 2018-12-21
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that the inhibitory effect of existing single-type low-dose kinetic inhibitors is limited and cannot meet the actual needs. Therefore, adding additives to enhance the inhibitory performance of kinetic inhibitors has become the focus of attention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. A hydrate inhibitor, consisting of the following components in weight percentage: terpolymer 10%, ether cosolvent 85%, dispersant 5%;

[0023] Wherein, the dispersant is methyl cellulose; the ether cosolvent is propylene glycol methyl ether;

[0024] The terpolymer is a terpolymer of vinylpyrrolidone, vinylcaprolactam, and isopropylene-methacrylamide, with an average molecular weight of 10000-18000g / mol;

[0025] 2. The preparation method of the hydrate inhibitor:

[0026] (1) Preparation of terpolymer: Add vinylpyrrolidone, vinylcaprolactam, isopropylene-methacrylamide and initiator to alcohol solvent according to the molar ratio of 1:1:1, pass N 2 After deoxygenation, stir and react at 85°C for 5h, after cooling to room temperature, stand in an oven at 40°C for 3h, filter, wash the filter residue with water for 3 times, and dry to constant weight in a vacuum oven to obtain vinylpyrrolidone , vinyl caprolactam, terpolymer of isopropylene-methacrylamide; wherein, t...

Embodiment 2

[0030] 1. A hydrate inhibitor, consisting of the following components by weight percentage: terpolymer 50%, ether cosolvent 49%, dispersant 1%;

[0031] Wherein, the dispersant is sodium carboxymethyl cellulose; the ether cosolvent is propylene glycol ether;

[0032] The terpolymer is a terpolymer prepared from vinylpyrrolidone, vinylcaprolactam, and isopropylene-methacrylamide, with an average molecular weight of 10000-18000g / mol;

[0033] 2. The preparation method of the hydrate inhibitor:

[0034] (1) Preparation of terpolymer: Add vinylpyrrolidone, vinylcaprolactam, isopropylene-methacrylamide and initiator to alcohol solvent according to the molar ratio of 1:85:10, pass N 2 After deoxygenation, stirred and reacted at 40°C for 16h, cooled to room temperature, stood still in an oven at 50°C for 2h, filtered, washed the filter residue with water for 3 times, and dried to constant weight in a vacuum oven to obtain vinylpyrrolidone , vinyl caprolactam, terpolymer of isopropy...

Embodiment 3

[0038] 1. A hydrate inhibitor, consisting of the following components by weight percentage: terpolymer 15%, ether cosolvent 55%, dispersant 30%;

[0039] Wherein, the dispersant is hydroxyethyl cellulose; the ether cosolvent is propylene glycol butyl ether;

[0040] The terpolymer is a terpolymer prepared from vinylpyrrolidone, vinylcaprolactam, and isopropylene-methacrylamide, with an average molecular weight of 10000-18000g / mol;

[0041] 2. The preparation method of the hydrate inhibitor:

[0042] (1) Preparation of terpolymer: Add vinylpyrrolidone, vinylcaprolactam, isopropylene-methacrylamide and initiator to alcohol solvent according to the molar ratio of 25:85:10, and pass N 2 After deoxygenation, stir and react at 85°C for 5h, after cooling to room temperature, stand in an oven at 40°C for 3h, filter, wash the filter residue with water for 3 times, and dry to constant weight in a vacuum oven to obtain vinylpyrrolidone , vinyl caprolactam, terpolymer of isopropylene-me...

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PUM

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Abstract

The invention provides a hydrate inhibitor which is prepared from the following ingredients in weight percent: 10 to 50% of terpolymer, 45 to 85% of an ether cosolvent and 1 to 30% of a dispersing agent, wherein the terpolymer is vinyl pyrrolidone, vinyl caprolactam and isopropenylancetylene-methacrylamide, and the dispersing agent is at least one of methylcellulose, sodium carboxymethylcelluloseand hydroxyethyl cellulose. Meanwhile, the invention further provides a preparation method and application of the hydrate inhibitor. The hydrate inhibitor disclosed by the invention can be applied toinhibiting generation of natural gas hydrate in gas-field exploitation, processing and conveying process and has the advantages of obvious inhibiting effect, small use amount and small harm to environment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas fields, and in particular relates to a hydrate inhibitor and its preparation method and application. Background technique [0002] Methane, ethane, carbon dioxide and other components in natural gas react with water at low temperature and high pressure to form ice crystal solid hydrates. After coalescence, the flow area of ​​the pipeline will be reduced, throttling will occur, and the hydrate formation will be further accelerated. Generated, thereby blocking the pipelines and equipment in the process of gas field exploitation, natural gas processing and transportation, seriously affecting the safe operation of natural gas exploitation, transportation and processing. Therefore, it is very important to add inhibitors to avoid and prevent gas hydrates from clogging well bores, processing devices and gas pipelines during the production, treatment and transportation of natural gas. [0003] The tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52F17D1/17
CPCC09K8/52C09K2208/22F17D1/17
Inventor 张娟利胡耀强鲍文李鹤王涛易冬蕊梁裕如张春威何鹏
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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