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基于格子玻尔兹曼方法的致密砂岩驱替模拟
唐明明1,卢双舫1,辛盈2,檀洪坤1,刘雪萍1,时贤3,张洪亮4
(1.中国石油大学(华东)深层油气重点实验室,山东青岛 266580;2.中国石油国际勘探开发有限公司,北京100621;3.中国石油大学(华东)石油工程学院,山东青岛266580;4.中国石油大庆油田第九采油厂地质大队,黑龙江大庆 163853)
摘要:
基于数字岩心建模方法和格子玻尔兹曼方法,开展致密砂岩水驱模拟研究,分析致密砂岩水驱微观过程和机制。首先利用大庆油田龙虎泡地区高台子组致密砂岩CT扫描数据,建立三维数字岩心模型;然后利用Shan-Chen格子玻尔兹曼方法,建立油水两相驱替数值模型;之后对比分析不同注入速度和注入压力条件下驱替效率、换油率与驱替参数的关系,并给出致密砂岩三维微观孔隙尺度的驱替过程。结果表明:相同累积注入量条件下,提高水驱注入速度和驱替压差可以提高最终驱替效率;水驱注入速度和驱替压差存在驱替效率拐点;恒速水驱的平均最终驱替效率为49.6%,恒压水驱的平均最终驱替效率为47.3%。
关键词:  致密砂岩  格子玻尔兹曼方法  恒压驱替  恒速驱替  数字岩心
DOI:10.3969/j.issn.1673-5005.2020.02.002
分类号:
文献标识码:A
基金项目:山东省自然科学基金项目(ZR2019MD006);国家自然科学基金项目(41402108);国家科技重大专项(2017ZX0507001,2016ZX05046001005)
Displacement of tight sandstone based on lattice Boltzmann method
TANG Mingming1, LU Shuangfang1, XIN Ying 2, TAN Hongkun1, LIU Xueping1, SHI Xian3, ZHANG Hongliang4
(1.Key Laboratory of Deep Oil and Gas in China University of Petroleum (East China), Qingdao 266580, China;2.China National Oil and Gas Exploration and Development Company Limited, Beijing 100621, China;3.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;4.Daqing Oilfield Limited No.9 Oil Production Company, PetroChina, Daqing 163853, China)
Abstract:
A series of simulation studies are carried out based on three-dimensional digital modelling method and lattice Boltzmann simulation method to investigate the micro processes and mechanism of water flooding in tight sandstone. In this paper, a three-dimensional digital rock model is constructed based on the high-resolution CT scan data of tight sandstone sample from Longhupao area in Daqing Oilfield. Then a series of numerical simulations are carried out based on lattice Boltzmann method (LBM) to analysis the micro displacement process of water flooding in tight sandstone with different injecting conditions. The results show that displacement efficiency is higher for water flooding with higher injection velocity or injection pressure difference when the total injection water volume is the same.There is an optimal value for the injection velocity and injection pressure difference for water flooding in tight sandstone. The average ultimate displacement efficiency of water flooding with a constant injection velocity is 49.6%, while the average ultimate displacement efficiency of water flooding with a constant injection pressure difference is 47.3%.
Key words:  tight sandstone  lattice Boltzmann method (LBM)  constant pressure displacement  constant velocity displacement  digital rock
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