基于格子玻尔兹曼的润湿性对降压效果的研究

doi:10.11885/j.issn.1674-5086.2015.12.29.02

西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (3): 111-120.DOI: 10.11885/j.issn.1674-5086.2015.12.29.02

基于格子玻尔兹曼的润湿性对降压效果的研究

张春华^1,2, 刘卫东^1,3, 苟斐斐^1,4

1. 中国科学院渗流流体力学研究所, 河北廊坊 065007;
2. "煤燃烧"国家重点实验室·华中科技大学, 湖北武汉 430074;
3. 中国石油勘探开发研究院廊坊分院, 河北廊坊 065007;
4. 中国石化石油勘探开发研究院, 北京海淀 100083

收稿日期:2015-12-29 出版日期:2017-06-01 发布日期:2017-06-01
通讯作者: 张春华,E-mail:bless10@163.com
作者简介:张春华,1987年生,男,满族,河北秦皇岛人,博士研究生,主要从事多孔介质内渗流数值模拟及提高采收率工作。E-mail:bless10@163.com;刘卫东,1969年生,男,汉族,河北唐山人,高级工程师,博士,主要从事油气田开发方面的研究工作。E-main:lwd69@petrochina.com.cn;苟斐斐,1988年生,男,汉族,甘肃庆阳人,高级工程师,博士,主要从事油藏数值模拟工作。E-mail:gouff@126.com

Simulation Study on the Effects of Wettability on Depressurization Based on Lattice Boltzmann Model

ZHANG Chunhua^1,2, LIU Weidong^1,3, GOU Feifei^1,4

1. Institute of Porous Flow & Fluid Mechanics, University of Chinese Academy of Sciences, Langfang, Hebei 065007, China;
2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;
3. Langfang Branch of Research Institute of Petroleum Exploration & Development, Langfang, Hebei 065007, China;
4. Petroleum Exploration and Production Research Institute, Sinopec, Haidian, Beijing 100083, China

Received:2015-12-29 Online:2017-06-01 Published:2017-06-01

摘要/Abstract

摘要： 改变油藏润湿性和降低油水界面张力是解决低渗/特低渗油田注水压力高问题的有效方法。而室内驱替实验时，表面活性剂浓度不仅影响油水界面张力，还会影响岩石表面润湿性能，无法准确评价表面活性剂的润湿性能对降压效果的影响。格子Boltzmann方法通过控制流体和固体间作用参数能够独立控制界面张力大小，并能够模拟任意接触角变化。因此，基于格子Boltzmann方法，应用二维平板模型，考虑粗糙表面，设置微观梯形结构，研究了毛管数、邦德数及黏度比等不同无量纲数条件下润湿性改变对降压率的影响。结果表明，毛管数越小，邦德数越大、黏度比越大、接触角越小，降压率越高、降压效果越明显；接触角存在一个最佳范围，超过此范围继续降低接触角，降压效果不明显；对于多孔介质，改变润湿性对降压率影响比单通道更加明显。

关键词: 表面活性剂, 格子玻尔兹曼, 润湿性, 界面张力, 接触角

Abstract: Changing the wettability of a reservoir and decreasing the oil-water interfacial tension is an effective method for solving the high pressure water injection problem in low and ultra-low permeability oil fields. However, during in-lab displacement experiments, the surfactant concentration not only affects the interfacial tension between oil and water, but also the wettability of the rock surface. As such, the effect of the surfactant wetting ability on depressurization cannot be accurately evaluated. Lattice Boltzmann models can control the interfacial tension independently through the interaction parameters between fluid and solid, and simulate any change in contact angle. Based on a lattice Boltzmann two-dimensional plane model, considering surface roughness and creating a micro-ladder structure, this study investigated the effects of changing wettability on depressurization rate under the dimensionless parameters of capillary number, Bond number, and viscosity ratio. The results show that with decreasing capillary number, the Bond number and viscosity ratio increase, and with decreasing contact angle, the depressurization rate and depressurization effect improve. There is an optimum range for the contact angle. Continued decrease in the contact angle outside this range produces no obvious depressurization. The changing wettability has a more pronounced effect on the depressurization rate for a porous medium than for a single channel.

Key words: surfactant, lattice Boltzmann, wettability, interfacial tension, contact angle

中图分类号:

TE357

张春华, 刘卫东, 苟斐斐. 基于格子玻尔兹曼的润湿性对降压效果的研究[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 111-120.

ZHANG Chunhua, LIU Weidong, GOU Feifei. Simulation Study on the Effects of Wettability on Depressurization Based on Lattice Boltzmann Model[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 111-120.

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基于格子玻尔兹曼的润湿性对降压效果的研究

Simulation Study on the Effects of Wettability on Depressurization Based on Lattice Boltzmann Model

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