氮气泡沫驱注入参数优化室内实验研究

发布时间：2018-03-31 16:41

本文选题：氮气泡沫　切入点：注入参数　出处：《东北石油大学》2017年硕士论文

【摘要】：泡沫是在起泡剂作用下气体在液相中形成的一种分散体系。泡沫在大孔道中流动时有较高的视黏度,流动阻力随泡沫注入量的增加而增大,当增加到超过小孔道中的流动阻力后,泡沫便越来越多地进入低渗透小孔道。泡沫在小孔道中流动视黏度低,小孔道中含油饱和度高,泡沫稳定性差。因而泡沫驱油能力大幅度提高。本研究针对某现场试验区块氮气泡沫驱注入参数优化难题开展了室内实验研究。主要完成三方面工作:(1)基于国内外调研结果分析总结了泡沫基本性质及概念、泡沫在多孔介质中的形成机理、泡沫在多孔介质中的稳定性及主要影响因素,为氮气泡沫驱注入参数优化和不同类型油藏不同驱替介质对比实验研究提供理论基础。(2)设计并开展了目标试验区块油藏压力条件下不同气液比(1:2、1:1、2:1、3:1)、不同注入量(0.2、0.3、0.4、0.5、0.6、0.7PV)、不同起泡剂浓度(0.2、0.3、0.4%)+稳泡剂浓度(0.04、0.08、0.12、0.16%)、不同注入方式(混合注入、交替周期0.1PV、交替周期0.15PV)、不同注入速度(0.5、1.0、1.5、2.0、2.5、3.0mL/min)的氮气泡沫驱油效果对比实验。研究结果表明试验区块氮气泡沫驱气液比为1:1、注入量为0.6PV、注入方式为混合注入、起泡剂浓度0.3%+稳泡剂浓度0.12%。(3)设计并开展了不同渗透率岩心(气测渗透率190、50、2×10-3μm2)氮气泡沫驱油效果对比实验和不同气体介质(氮气、天然气)泡沫驱油效果对比实验。研究结果表明天然气泡沫驱与氮气泡沫驱相比最终采收率略有提高,气测渗透率190×10-3μm2条件下天然气泡沫驱比氮气泡沫驱的最终采收率提高了1个百分点左右。通过上述研究给出了氮气泡沫驱注入参数优化设计实验方案和目标试验区块氮气泡沫驱注入参数优化室内实验研究结果,本研究成果对油田现场氮气泡沫驱注入参数优化设计具有重要指导意义。
[Abstract]:Foam is a dispersed system formed by gas in liquid phase under the action of foaming agent. The flow resistance increases with the increase of foam injection. When the flow resistance in the pore passage exceeds the flow resistance, the foam enters the low permeability pore channel more and more. The foam flows in the channel with low apparent viscosity and high oil saturation in the small pore channel. The foam stability is poor, and the foam flooding ability is greatly improved. This study has carried out laboratory experimental research on the optimization of injection parameters of nitrogen foam flooding in a field test block. The basic properties and concepts of foam are analyzed and summarized. The formation mechanism of foam in porous media, the stability of foam in porous media and the main influencing factors, This paper provides a theoretical basis for the optimization of injection parameters of nitrogen foam flooding and the experimental study of different flooding media for different types of reservoirs. The design and development of different gas-liquid ratios of 1: 2: 1: 1: 1: 1: 3: 1, different injection amount of 0.2U / 0.3N / 0.40.50.60.7PVN under reservoir pressure conditions in the target experimental area are carried out. The concentration of foam stabilizer is 0.04 ~ 0.08 ~ 0.120.16 ~ 0.16% (mixed injection, mixed injection, mixed injection). A comparative experiment on the oil displacement effect of nitrogen foam with different injection rates (0.1 PVV, 0.15 PVN, different injection rates) was conducted. The results showed that the gas / liquid ratio of nitrogen foam flooding was 1: 1, the injection rate was 0.6 PVin, and the injection mode was mixed injection, the results showed that the ratio of nitrogen foam flooding to liquid was 1: 1, the injection rate was 0.6 PV. the injection mode was mixed injection. The core with different permeability (gas permeability 1902 脳 10 ~ (-3) 渭 m ~ (2)) and different gas medium (nitrogen) were designed and carried out. The results show that the final recovery factor of natural gas foam flooding is slightly higher than that of nitrogen foam flooding. Under the condition of gas permeability 190 脳 10 ~ (-3) 渭 m ~ (2), the final recovery factor of natural gas foam flooding is increased by about 1 percentage point compared with nitrogen foam flooding. Through the above research, the experimental scheme and target test area for the optimization design of injection parameters of nitrogen foam flooding are given. Results of laboratory experiments on optimization of injection parameters of block nitrogen foam flooding, The results of this study are of great significance to the optimization design of injection parameters of nitrogen foam flooding in oil field.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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