冻土区裂隙性地层中水合物形成机理及相态研究

苏凯; 张国彪; 孙友宏; 李胜利; 郭威

doi:10.11911/syztjs.201602016

冻土区裂隙性地层中水合物形成机理及相态研究

苏凯^1,2,
张国彪^1,2,
孙友宏^1,2,
李胜利^1,2, ,,
郭威^1,2

1.
吉林大学建设工程学院, 吉林长春 130021;
2.
复杂条件钻采技术国土资源部重点实验室(吉林大学), 吉林长春 130021

基金项目:

国家自然科学"冻土区裂隙性天然气水合物CO₂/N₂置换开采机理及实验研究"(编号:51474112);"脉冲蒸汽法开采冻土区天然气水合物地层耦合传热机理研究"(编号:51304079);"盐类低温钻井液对天然气水合物相平衡和分解动力学影响"(编号:41502343)和"CO₂置换开采Ⅱ型天然气水合物动力学规律研究"(编号:51506073)资助。

详细信息

作者简介:
苏凯(1992-),男,安徽滁州人,2014年毕业于吉林大学地质工程专业,地质工程专业在读硕士研究生,主要研究天然气水合物试采技术。E-mailsukai14@mails.jlu.edu.cn。

通讯作者:
李胜利,lishengli@jlu.edu.cn。

中图分类号: TE311⁺.1
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出版历程
- 收稿日期: 2015-11-12
- 修回日期: 2016-02-23
- 刊出日期: 1899-12-31

Formation Mechanism and Phase State of Hydrates in Fractured Layers of Permafrost

SU Kai^1,2,
ZHANG Guobiao^1,2,
SUN Youhong^1,2,
LI Shengli^1,2, ,,
GUO Wei^1,2

1.
College of Construction Engineering, Jilin University, Changchun, Jilin, 130021, China;
2.
Key Laboratory of Drilling and Production Technology under Complex Conditions, Ministry of Land and Resources(Jilin University), Changchun, Jilin, 130021, Chi

摘要

摘要: 天然气水合物广泛充填于冻土地层裂隙中,钻探冻土地层裂隙中的天然气水合物需要先对其合成、分布和相态进行研究。基于祁连山地区裂隙性地层特征制作了人工岩心,进行了天然气水合物的形成及相平衡实验;利用A.H.Mohammadi提出的天然气水合物热力学模型,预测了NaCl和KCl溶液中天然气水合物的相平衡条件,并分析其在含盐低温钻井液条件下的相平衡偏移问题。实验得出,天然气水合物主要分布在岩心的裂隙面及端面;压力为4 MPa时,质量分数为5%和10%的NaCl溶液中天然气水合物的相平衡温度分别降低了约2.2 K和4.6 K,质量分数为10%的KCl溶液中天然气水合物的相平衡温度降低了3.4 K。研究结果表明:冻土地层裂隙中的天然气水合物由大量块状水合物和极少量孔隙充填型水合物组成,其相平衡条件与宏观水相中一致,在相同盐度下NaCl对天然气水合物相平衡的影响大于KCl。
- 天然气水合物 /
- 裂隙 /
- 冻土 /
- 钻井液 /
- 相平衡
Abstract: Natural gas hydrate is widely distributed in the fractured layers of permafrost. In order to explore gas hydrate in the fractured layers of permafrost, it is necessary to study its formation, distribution and phase state. In this paper, the formation and phase equilibrium experiments of gas hydrate were conducted on the artificial cores which were prepared in reference to the characteristics of fractured layers in the area of Qilian Mountains. The phase equilibrium of hydrate in NaCl and KCl solutions were predicted according to the gas hydrate thermodynamic model created by A.H.Mohammadi, and the phrase equilibrium migration of hydrate in drilling fluids under the conditio of low temperature and salt bearing was discussed. It is shown by experimental results that gas hydrate is mainly distributed at the fracture surface and end surface of samples. When the pressure is 4 MPa, the phase equilibrium temperature of hydrate in NaCl solutions that have mass fraction of 5% and 1% declined about by 2.2 K and 4.6 K, respectively, and that in KCl solution with mass fraction of 10% decreased by 3.4 K. Research results indicated that the gas hydrate in fractured layers of permafrost is mostly in the massive form and slightly filled in the pores, and its phase equilibrium condition is consistent with that in macroscopic water phase. And under the same salinity, the effect of NaCl on the phase equilibrium of gas hydrate is greater than that affected by KCl.
- natural gas hydrate /
- fracture /
- permafrost /
- drilling fluid /
- phase equilibrium

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