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低渗透油田注气驱油实验和渗流机理研究 【作者】李孟涛 【导师】单文文; 刘先贵

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低渗透油田注气驱油实验渗流机理研究水利论文R9RT9Js,Fqj

Jl O:KC Y0作者】李孟涛 【导师】单文文; 刘先贵水利论文9w$o8|k!Fz
【作者基本信息】中国科学院研究生院(渗流流体力学研究所),流体力学,2006年,博士

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S]u_Cit2b0【中文摘要】 论文是基于低渗透油藏在注气驱油开发中所面临的实际问题,在总结前人已有成果的基础上,对低渗透油藏的气驱实验和渗流机理进行了研究,完成了以下研究工作: 1、全面系统地查阅了中外大量文献,为所做研究工作奠定了基础,使得研究的结果对低渗透油藏气驱具有广泛的适用性。 2、通过细管实验、长岩心实验、公式模拟预测和微观实验测定了原油与天然气、原油与CO2最小混相压力,测得了不同压力下注气可以提高的驱替效率。 3、通过天然岩芯的长岩心实验得到了以下结论: ①对CO2驱,最小混相压力下,均质地层注气驱替方式对驱替效率有很大的影响,水气交替驱时有0.1HCPV(烃体积倍数)的气体段塞的驱替是好的选择,在提高驱替效率上,纯气驱优于水后气驱;水后气驱优于气水交替驱。 ②对天然气驱,非混相压力下,在水驱后天然气驱的实验中,驱替压差大多数在气驱时最大,当纯水驱驱替到含水98%以上后,再注入天然气时的驱替效率明显上升,含水率快速下降;水气交替驱的驱替效率与水后纯气驱的相近。 ③实验中,大庆榆树林油田注入CO2气体的最佳量为0.3到0.4HCPV,注水开发和CO2注气开发都能有效地向地层补充能量,是开发低渗透...更多油田的有效方法。前期注水补充地层能量提高驱替效率要好些;中期注气要好些,CO2中加入少量氮气对驱替效率的负面影响很大;CO2中加入天然气对驱替效率的负面影响小。 4、通过实验研究揭示了一些新的气驱现象和机理:①通过局部混相和气体携带可以进一步增加气体突破后的驱替效率;②混相时碳组分的碳20以下含量有极大值,显示了原油中碳20以下组分含量对最小混相压力大小的影响;③混相和萃取的微观过程以及水气交替驱时水对混相的影响机理,通过分析和演示过程揭示了混相和萃取对提高驱替效率的机理以及水气交替驱时水对混相不利影响的产生原因,并提出了减少水对混相影响的方法,那就是选择合理的气体段塞。 5、初步建立和推导了低渗透油藏混相驱替模型和渗流方程以及低渗透双孔萃取模型和渗流方程,选择的油田区块数值模拟与实验数据趋势吻合。 论文创新点: 1、找到一种快速和准确的寻找最小混相压力的方法:微观实验观察法。可以更直观与准确的寻找气体与原油的最小混相压力。 2、揭示了一些如上第4条的新的气驱机理,并且建立和推导了低渗透油减混相驱替模型和渗流方程以及低渗透双孔萃取模型和渗流方程。  还原水利论文9s;| s3} qp.i n;TiN

OX2}%d6EOq0【英文摘要】 In this paper, laboratory researches on gas injection and porous flow mechanics in low permeability reservoirs are studied for the practical problems that occurred during the development of reservoirs, which are accomplished on the base of predecessors' work. The main research results are gotten as follows:1 I had consulted a large number of Chinese and foreign documents. These results of my researching work have extensive suitability to low permeability reservoirs. All analysis methods and the experimental techniques have been applied according to rule, the theory and actual unified. Some foundational and the practical conclusions are obtained.2 Basis to low permeate large-scale Yushulin oil field of Daqing, there are a series of experiment researches about CO2 displacement in fine tube, in long core, in formular simulation and in microcosmic experiments. After all of those, a conclusion can be drawn that CO2 miscible flooding can be developed in reservoir condition, the experimente...更多d MMP (minimum miscible pressure) of CO2 and natural gas are obtained by laboratory tests. The enhanced oil recoveries under different pressures have been gained for low permeability oil reservoirs.3 Through long core experiments some conclusions are obtained as follows:(1)The new craft mode of carbon dioxide miscible flooding is put forward and its result in oil physical simulation is provided. The experiment and numerical simulation result show: CO2 flooding can improve the oil recovery rate by a large margin. The influences of water on CO2 miscible flooding can be reduce greatly if there is at last one 0.1 HCPV gas section during water alternate gas injection. This way can raise recovery ratio to be most heavy.(2)The effect of water flooding is not good. In order to advance oil recovery ratio greatly, a series of experiment researches about natural gas displacement are done that include tests in fine tube, in long core and the water alternate gas injection. After these tests mechanisms and factors of effect on oil recovery ratio are analyzed. A conclusion can be drawn that natural gas immiscible flooding can be developed in reservoir  还原水利论文:g8zgt Y;MPjJ

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【中文关键词】 低渗透油藏; 气驱; 混相驱; 微观实验; 渗流机理水利论文7bQ ]-EDy2yR6n\3W*H
【英文关键词】 low permeability reservoirs; gas injection; miscible oil-displacing; microcosmic laboratory; porous flow mechanics水利论文J.iKa,f

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TAG: 机理 实验 油田注气 驱油 渗流
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