不同润湿性修饰石英吸附甲烷的模拟研究

doi:10.11885/j.issn.1674-5086.2019.09.16.11

西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (6): 28-34.DOI: 10.11885/j.issn.1674-5086.2019.09.16.11

不同润湿性修饰石英吸附甲烷的模拟研究

汪周华¹, 赵建飞¹, 白银², 郭平¹, 刘煌¹

1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500;
2. 中国石油塔里木油田分公司勘探开发研究院, 新疆库尔勒 841000

收稿日期:2019-09-16 出版日期:2019-12-10 发布日期:2019-12-10
通讯作者: 汪周华,E-mail:wangzhouhua@126.com
作者简介:汪周华,1979年生,男,汉族,湖北公安人,研究员,主要从事油气藏流体相态研究、特殊气藏开发理论及配套技术、注气提高采收率理论及配套技术、低渗透油气藏开发理论与方法、非常规气藏开发等方面的研究工作。E-mail:wangzhouhua@126.com;赵建飞,1992年生,男,汉族,四川乐山人,博士研究生,主要从事页岩气吸附扩散分子模拟与第一性原理等方面的研究工作。E-mail:396004507@qq.com;白银,1984年生,女,汉族,陕西长安人,工程师,主要从事地质勘探方面的研究工作。E-mail:baiyintlm@petrochina.com.cn;郭平,1965年生,男,汉族,四川射洪人,教授,博士生导师,主要从事油气藏流体(水合物)相态、气田开发、注气提高采收率、油气开发工程中的基础问题等方面的研究工作。E-mail:guopingswpi@vip.sina.com;刘煌,1986年生,男,汉族,湖南娄底人,副研究员,主要从事高压流体相态、气体水合物技术研发、油气藏开发等方面的研究工作。E-mail:liuhuangswpu@sina.com
基金资助:
国家自然科学基金（5183000045）；四川省科技计划重点研发项目（2018JZ0079）；四川省重大科技专项援疆项目（2019YFG0457）

Simulation of Methane Adsorption of Quartz with Different Wettability

WANG Zhouhua¹, ZHAO Jianfei¹, BAI Yin², GUO Ping¹, LIU Huang¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Exploration and Development Research Institute, Tarim Oilfield Branch, PetroChina, Korla, Xinjiang 841000, China

Received:2019-09-16 Online:2019-12-10 Published:2019-12-10

摘要/Abstract

摘要： 润湿性是油气藏储层岩石的重要基础参数之一，其特征直接影响流体在岩石孔道内的微观分布和宏观分布特征。从微观层面认识页岩气与矿物的相互作用是深入理解页岩气赋存状态的基础。采用分子模拟研究了甲烷在不同石英模型中的吸附行为，考察了不同晶面、亲水与亲油官能团修饰模型对甲烷吸附的影响。研究结论表明，不同晶面模型中，（100）面的吸附量大于其他晶面的吸附量；甲烷在亲油修饰模型中的吸附量大于亲水修饰模型的吸附量；两种修饰模型吸附量均随着压力增加而增加，随温度的升高而减小，且温度对吸附量的影响小于孔径的影响；相同条件下，润湿性修饰模型的吸附量远大于无润湿性修饰模型的吸附量；1 nm修饰模型中甲烷只在壁面处形成吸附层，而2 nm修饰模型中形成多个吸附层。

关键词: 甲烷, 石英, 润湿性, 吸附, 分子模拟

Abstract: As one of the important basic parameters of reservoir rocks, wettability's characteristics directly affect the micro and macro distribution characteristics of fluids in rock pores. Understanding the interaction between shale gas and minerals at the micro-level is the basis of understanding the state occurrence of shale gas. Molecular simulation was used to study the adsorption of methane in different conditions of modified quartz, and different crystal faces and wettability were studied. The conclusions of the study are as follows. In different crystal-faces models, the adsorption capacity of (100) surface is greater than that of the other models. The adsorption of methane in the modified oil-philic model is larger than that in the modified water-philic model. The adsorption of methane in different wettability modification models increases with the increase of pressure, and decreases with the increase of temperature, and the effect of temperature is less than that of aperture. Under the same conditions, the adsorption capacities of the modified models are much larger than that of the unmodified model. In the 1 nm modified models, an adsorption layer is formed at the wall surface, while multiple adsorption layers are formed in 2 nm modified models.

Key words: methane, quartz, wettability, adsorption, molecular simulation

中图分类号:

TE319

汪周华, 赵建飞, 白银, 郭平, 刘煌. 不同润湿性修饰石英吸附甲烷的模拟研究[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 28-34.

WANG Zhouhua, ZHAO Jianfei, BAI Yin, GUO Ping, LIU Huang. Simulation of Methane Adsorption of Quartz with Different Wettability[J]. 西南石油大学学报(自然科学版), 2019, 41(6): 28-34.

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不同润湿性修饰石英吸附甲烷的模拟研究

Simulation of Methane Adsorption of Quartz with Different Wettability

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