首页|甘氨酸与热力学抑制剂对甲烷水合物的协同抑制机理

甘氨酸与热力学抑制剂对甲烷水合物的协同抑制机理

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天然气水合物在开采过程中,温度和压力的变化会导致分解后的水合物二次形成,进而会造成井筒和管线堵塞.甘氨酸因其强亲水性和生物可降解性,在水合物防治方面具有巨大应用潜力,但其与热力学抑制剂复配协同抑制水合物生成的作用机理尚不明确.为此,开展了甘氨酸与常见盐类和醇类热力学抑制剂复配使用时的甲烷水合物生成模拟实验,分析了甘氨酸与热力学抑制剂协同抑制甲烷水合物生成机理,并形成了适用于海洋水合物钻探开发用的甘氨酸类钻井液体系.研究结果表明:①甲烷气消耗量并不能真实反映抑制剂对水合物生成的抑制效果,还需结合水合物最终生成量、水合物生成3个阶段的时间变化情况综合判断;②甘氨酸浓度为1.0％时,抑制水合物生成的效果最佳,对应的反应体系具有最小的水合物生成区和最大的稳定区;③相比于单独使用1.0％甘氨酸,5.0％盐类抑制剂与1.0％甘氨酸混合使用时,具有协同抑制水合物生成的效果,可减少水合物生成量20％～30％,但5.0％醇类抑制剂与1.0％以及0.5％甘氨酸混合使用时反而促进了水合物生成;④甘氨酸与盐类混合形成的钻井液体系,可以有效降低水合物生成量.结论认为,该认识进一步厘清了甘氨酸与热力学抑制剂对水合物的协同抑制机理,为解决水合物开采过程中井筒堵塞造成的钻井安全问题提供了实验数据和理论支撑.
Synergistic inhibition mechanism of glycine and thermodynamic inhibitor to methane hydrate
In the process of exploiting natural gas hydrate,temperature and pressure changed can lead to secondary formation of gas hydrate after decomposition,resulting in wellbore and pipeline blockage.Due to the strong hydrophilicity and biodegradability,glycine has great application potential in hydrate prevention and control.However,its synergistic inhibition mechanism to hydrate formation when combining it is combined with thermodynamic inhibitors has not been understood clearly.In this paper,the formation of methane hydrate under the action of the combination of glycine with common salt and alcohol thermodynamic inhibitors is experimentally simulated,the synergistic inhibition mechanism of glycine and thermodynamic inhibitors to the formation of methane hydrate is analyzed,and the glycine drilling fluid system suitable for marine hydrate exploration and development is formed.And the following research results are obtained.First,methane gas consumption cannot truly reflect the inhibition effect of inhibitors on hydrate formation,and it needs to be combined with the an ultimate amount of hydrate formation and the a time change of three hydrate formation stags to give a comprehensive judgement.Second,when the concentration of glycine is 1.0％,the inhibition effect on hydrate formation is the best,and the corresponding reaction system has the smallest hydrate formation zone and the largest stable zone.Third,compared with 1.0％glycine,the combination of 5.0％salt inhibitor and 1.0％glycine has a synergistic inhibition effect on hydrate formation,and can reduce the hydrate formation by 20％to 30％.However,the combination of 5.0％alcohol inhibitors with 1.0％and 0.5％glycine promotes hydrate formation instead.Fourth,the drilling fluid system composed of glycine and salts can effectively reduce hydrate formation.In conclusion,the research results further clarify the synergistic inhibition mechanism of glycine and thermodynamic inhibitor to the formation of methane hydrate,and provide experimental data and theoretical basis for solving the drilling safety problems caused by wellbore blockage in the process of hydrate exploitation.

Methane hydrateGlycineThermodynamic inhibitorSynergistic effectInfluence factorDrilling fluid systemBasic physical propertiesInhibition performance

汪杰、张良君、刘成、郭盼阳、江厚顺、马攀、付宏雨

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非常规油气省部共建协同创新中心·长江大学

油气钻采工程湖北省重点实验室·长江大学

长江大学石油工程学院

中国石油浙江油田公司油气勘探开发项目经理部

中国石油辽河油田公司金海采油厂

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甲烷水合物 甘氨酸 热力学抑制剂 协同效果 影响因素 钻井液体系 基础物性 抑制性能

长江大学·非常规油气省部共建协同创新中心开放基金湖北省自然科学基金面上项目(青年)湖北省教育厅科学技术研究计划资助项目(青年)

UOG2024-042021CFB249Q20211303

2024

10.3787/j.issn.1000-0976.2024.08.009

天然气工业
四川石油管理局 中国石油西南油气田公司 中国石油川庆钻探工程公司

天然气工业

CSTPCD北大核心EI
影响因子：2.298
ISSN：1000-0976
年,卷(期)：2024.44(8)