甲醇与聚乙烯吡咯烷酮复配体系抑制水合物生成效果实验

姚自义; 刘怀珠; 何水良; 赵康宁; 李玲; 李芳芳; 马攀; 汪杰

doi:10.3969/j.issn.1006-6535.2025.02.013

特种油气藏 >

2025 , Vol. 32 >Issue 2: 103 - 109

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.02.013

油藏工程

甲醇与聚乙烯吡咯烷酮复配体系抑制水合物生成效果实验

姚自义 ,
刘怀珠 ,
何水良 ,
赵康宁 ,
李玲 ,
李芳芳 ,
马攀 ,
汪杰

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1.长江大学非常规油气省部共建协同创新中心,湖北武汉 430100;
2.长江大学油气钻采工程湖北省重点实验室,湖北武汉 430100;
3.长江大学石油工程学院,湖北武汉 430100;
4.唐山冀油瑞丰化工有限公司,河北唐山 063500

姚自义(1999—),男,2022年毕业于长江大学石油与天然气工程专业,现为该校油气田开发工程专业在读硕士研究生,主要从事天然气水合物的开发与防治、非常规油气藏提高油气采收率技术方面的研究工作。

收稿日期: 2024-06-29

修回日期: 2025-01-11

网络出版日期: 2025-06-16

基金资助

湖北省教育厅科学研究计划重点项目“低渗透油藏降阻增注纳米乳液体系作用机理及影响因素研究”(D20231301);油气钻采工程湖北省重点实验室开放基金“水合物藏渗透率演变机理及产能预测研究”(YQZC202401)

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Experiments on the effect of methanol and polyvinylpyrrolidone compound system to inhibit hydrate generation

YAO Ziyi ,
LIU Huaizhu ,
HE Shuiliang ,
ZHAO Kangning ,
LI Ling ,
LI Fangfang ,
MA Pan ,
WANG Jie

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1. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China;
2. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan, Hubei 430100, China;
3. School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China;
4. Tangshan Jiyou Ruifeng Chemical Co., Ltd., Tangshan, Hebei 063500, China

Received date: 2024-06-29

Revised date: 2025-01-11

Online published: 2025-06-16

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摘要

工业常用的热力学抑制剂存在使用量大、成本高、污染严重等问题。针对该问题,根据热力学与动力学抑制剂复配协同抑制原理,对甲醇与聚乙烯吡咯烷酮(PVP)复配体系抑制水合物生成的效果及变化规律进行研究。研究表明:甲醇分子通过亲水性羟基和亲油性甲基抑制水合物生成,水合物生成量随甲醇用量的增加而降低甚至消失,质量分数为10.00%时甲醇抑制水合物生成的效果最优。PVP通过内部溶解与表面吸附抑制水合物成核与生长,PVP抑制水合物生成的效果由相对分子质量和物质的量分数共同决定,且存在抑制效果最佳质量分数。一定范围内,物质的量分数相同的抑制剂溶液中,PVP对水合物生成的抑制性能随相对分子质量增加而增强。PVP与甲醇复配体系抑制水合物生成的效果均优于单独使用相同质量分数的甲醇,具有良好的协同抑制性能。不同类型抑制剂复配使用,既可降低使用成本,又可提高抑制水合物生成的效果,确保气井安全生产。

关键词： 甲烷水合物; 甲醇; 聚乙烯吡咯烷酮; 协同抑制原理; 现场应用

本文引用格式

姚自义 , 刘怀珠 , 何水良 , 赵康宁 , 李玲 , 李芳芳 , 马攀 , 汪杰 . 甲醇与聚乙烯吡咯烷酮复配体系抑制水合物生成效果实验[J]. 特种油气藏, 2025 , 32(2) : 103 -109 . DOI: 10.3969/j.issn.1006-6535.2025.02.013

Abstract

The commonly used thermodynamic inhibitors in industry have issues such as large usage amounts,high costs,and severe pollution.To address such issues,based on the principle of synergistic inhibition by the combination of thermodynamic and kinetic inhibitors,the effectiveness and variation patterns of the methanol and polyvinylpyrrolidone (PVP) compound system in inhibiting hydrate formation were studied.The study shows that Methanol molecules inhibit hydrate formation through their hydrophilic hydroxyl groups and lipophilic methyl groups.The amount of hydrate formed decreases and may even disappear with increasing methanol usage,with the optimal inhibitory effect of methanol on hydrate formation achieved at a mass fraction of 10.00%.PVP inhibits hydrate nucleation and growth through internal dissolution and surface adsorption.The effectiveness of PVP in inhibiting hydrate formation is determined jointly by its relative molecular mass and mole fraction,and there exists an optimal mass fraction for the best inhibitory effect.Within a certain range,in inhibitor solutions with the same mole fraction,the inhibitory performance of PVP against hydrate formation increases with increasing relative molecular mass.The compound system of PVP and methanol is more effective in inhibiting hydrate formation than using methanol alone at the same mass fraction,demonstrating good synergistic inhibitory performance.The combined use of different types of inhibitors can both reduce costs and enhance the effectiveness of inhibiting hydrate formation,ensuring the safe production of gas wells.

Key words： methane hydrate; methanol; polyvinylpyrrolidone; synergistic inhibition principle; field application

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