Mechanisms of water flooding characteristic curve upwarping at high water-cut stage and influencing factors

水驱 含水率 阶段(地层学) 环境科学 洪水(心理学) 含水饱和度 注水(采油) 土壤科学 石油工程 机械 水文学(农业) 地质学 多孔性 岩土工程 物理 心理学 古生物学 心理治疗师
作者
Jun Yao,Lei Zhang,Hai Sun,Tao Huang,Yongfei Yang,Guangpu Zhu,Yaohao Guo
出处
期刊:Kexue tongbao [Science China Press]
卷期号:64 (26): 2751-2760 被引量:7
标识
DOI:10.1360/tb-2019-0132
摘要

Water flooding is widely used in oilfield development as a secondary recovery method owning to its effectiveness and economic feasibility. When the injected water breaks through the production well, water is produced with oil. The water flooding characteristic curve is an important method for predicting recoverable reserves, recovery rates, and oilfield development dynamics. It reflects the oil-water composition of oilfield-produced fluids. The linear relationship between the relative permeability ratio ( K ro/ K rw) and water saturation ( S w) in semi-log coordinates is a theoretical basis for the water flooding characteristic curve. However, many mine practices and core experiments show that the relationship deviates from a straight line at a high water-cut stage, and the water flooding characteristic curve shows an upward trend. The upwarping phenomenon of the water flooding characteristic curve is related to the flow state of the oil/water phase. The continuum description, Darcy’s law, fails to predict and describe the transport of scattered residual oil in pore spaces. Many previous studies tried to obtain a non-linear relationship between ln( K ro/ K rw) and S w at the high water-cut stage by different methods, including fitting the experimental data. Though there are many studies on the upwarping phenomenon of water flooding characteristic curve, few studies focus on the mechanisms of this phenomenon. In addition, the effects of important development parameters, such as wettability and water-oil viscosity ratio, on the upwarping phenomenon are unclear. In this study, the Navier-Stokes equation is coupled with the phase field method to describe the water flooding processes in porous media and to track the two phase interface. The effects of wall wettability and oil-water viscosity ratio on the flow patterns were analyzed by numerical simulations. In addition, the critical water cut when the relationship between ln( K ro/ K rw) and S w deviates from the straight line was investigated. The results show that residual oil is mainly scattered at the high water-cut stage, and the flow capacity of oil rapidly decreases, which leads to the upwarping phenomenon of the water flooding characteristic curve. The critical water cut is different under different wetting conditions. Due to the effect of capillary force, the flow capacity of oil is stronger, and more oil can be displaced out through the imbibition process at the high water-cut stage in water-wet porous media, and the critical water cut increases when wettability changes from oil-wet to water-wet. The flow patterns of oil and water are different at different oil-water viscosity ratios. At the low viscosity ratio, the displacement front is more uniform, and the removal of oil by water mainly depends on expanding the sweeping area at the high water-cut stage. For the high viscosity ratio case, clear fingers of injected water can be observed during the flooding process, and it is difficult for the injected water to enter the areas which were not previously swept at the high water-cut stage. The viscous fingering phenomenon enhances the ineffective displacement of the injected water. The relationship between ln( K ro/ K rw) and S w deviates from a straight line at a lower water cut when the oil-water viscosity ration is high.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
刚刚
刚刚
1秒前
Nxxxxxx完成签到,获得积分10
1秒前
dongdong发布了新的文献求助10
2秒前
2秒前
时臣的错完成签到,获得积分10
2秒前
3秒前
梦伶发布了新的文献求助50
3秒前
3秒前
郭小宝发布了新的文献求助10
4秒前
DrCoLd发布了新的文献求助10
4秒前
杜科研完成签到,获得积分10
4秒前
刘阳完成签到,获得积分10
4秒前
clairr发布了新的文献求助30
6秒前
Ren应助左左采纳,获得10
6秒前
6秒前
丙子哥完成签到,获得积分10
7秒前
7秒前
无花果应助科研通管家采纳,获得10
7秒前
倪小呆发布了新的文献求助10
7秒前
研友_VZG7GZ应助科研通管家采纳,获得10
7秒前
我是老大应助科研通管家采纳,获得10
7秒前
岳岳完成签到,获得积分10
7秒前
7秒前
坦率的匪应助科研通管家采纳,获得10
7秒前
7秒前
脑洞疼应助科研通管家采纳,获得20
8秒前
MchemG应助科研通管家采纳,获得10
8秒前
无花果应助科研通管家采纳,获得10
8秒前
8秒前
完美世界应助科研通管家采纳,获得10
8秒前
华仔应助科研通管家采纳,获得10
8秒前
李健应助科研通管家采纳,获得10
8秒前
8秒前
爆米花应助科研通管家采纳,获得10
8秒前
科研通AI2S应助科研通管家采纳,获得10
8秒前
9秒前
橘子海完成签到,获得积分20
9秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988827
求助须知:如何正确求助?哪些是违规求助? 3531183
关于积分的说明 11252671
捐赠科研通 3269809
什么是DOI,文献DOI怎么找? 1804780
邀请新用户注册赠送积分活动 881885
科研通“疑难数据库(出版商)”最低求助积分说明 809021