XG7裂缝性油藏注气提高采收率开发方式研究

发布时间：2018-05-13 00:11

本文选题：裂缝性油藏 + 注气驱　；参考：《西南石油大学》2015年硕士论文

【摘要】：裂缝性油藏在世界石油和天然气的产量和储量中都占有十分重要的地位。世界原油总产量的三分之一以上采自裂缝性油藏。裂缝性油藏是一种复杂的油藏类型,尤其是该类油藏表现出强非均质性,且裂缝系统和基质系统在储集和渗流方面存在较大差异,导致该类油藏注水开发效果并不是很理想。近年来,注气驱越来越多的应用到油藏开发中,而气驱开发的很多优势在裂缝性油藏中也得到体现。本文在参阅大量国内外文献的基础上,从裂缝性油藏的注气影响因素以及驱油机理方面出发,对裂缝性油藏注气开发过程进行详细地理论剖析,运用数值模拟手段,在建立XG7裂缝性油藏孔隙-裂缝双重介质模型的基础上,对XG7裂缝性油藏的注入介质、注入部位、注入量、注入速度、注入方式等进行了方案设计与分析。模拟结果表明：在顶部注气时,注二氧化碳相对于衰竭式开发的原油增量267.20×104t,高于注烃气开发的原油增量259.15×104t还要高出近7×104t,和注氮气开发的原油增量250.84×104t,在腰部和底部注气时二氧化碳的各项参数同样优于注烃气和注氮气；对比不同注入部位时发现,顶部注气开发油藏相对于衰竭式开发的原油增量250.84×104t,高于腰部注气开发的原油增量224.12×104t和底部注气开发的原油增量214.28×104t；当选择顶部注气时,注入量为53.43×108m3时相对于衰竭式开发的原油增量为400.08×104t,该值大于注入量为41.10×108m3时的原油增量297.64×104t和注入量为36.01×108m3时的原油增量250.81×104t,底部注气时注入量大的方案各项参数同样优于注入量小的方案；随着注入速度的增加,在注入速度为25×104m3／d时换油率出现峰值；对比不同注入方式发现,连续注气相对于衰竭式开发的原油增量为224.04×104t,大于周期为6个月的脉冲注气的原油增量171.93×104t,和周期为2个月的脉冲注气的原油增量173.58×104t。针对XG7真实裂缝性油藏,提出以下几点建议：在技术条件允许的情况下建议向油藏顶部注二氧化碳,注入速度优选20×104m3/d-30×104m3/d之间,建议30年的注气量在40×108m3-50×108m3之间。在选择注入方式时,可以优先选择连续注气进行开发。在油藏开发过程中,应结合油藏的实际情况进行开发方案设计。希望本文中的结论和建议能够为裂缝性油藏注气开发提供一定的参考依据。
[Abstract]:Fractured reservoirs play an important role in oil and gas production and reserves in the world. More than 1/3 of the world's total crude oil production is produced from fractured reservoirs. Fractured reservoir is a kind of complex reservoir type, especially this kind of reservoir shows strong heterogeneity, and there are great differences in reservoir and percolation between fracture system and matrix system, which leads to the low water injection development effect in this kind of reservoir. In recent years, gas flooding is more and more used in reservoir development, and many advantages of gas drive development are also reflected in fractured reservoirs. On the basis of consulting a large number of domestic and foreign literatures, this paper analyzes the gas injection development process of fractured reservoirs in detail and uses numerical simulation methods from the aspects of gas injection influencing factors and oil displacement mechanism of fractured reservoirs. On the basis of establishing the pore fracture dual medium model of XG7 fractured reservoir, the scheme design and analysis of injection medium, injection location, injection rate, injection rate and injection mode of XG7 fractured reservoir are carried out. The simulation results show that: at the top of the gas injection, Carbon dioxide injection is 267.20 脳 10 4 t higher than that of hydrocarbon injection gas (259.15 脳 10 4 t), and 250.84 脳 10 4 t higher than that of nitrogen injection. The parameters of carbon dioxide at waist and bottom are the same. Better than hydrocarbon injection gas and nitrogen injection gas; Comparing different injection sites, it is found that the oil increment of top gas injection development reservoir is 250.84 脳 10 ~ 4t compared with that of exhaustion development, which is higher than that of waist gas injection development (224.12 脳 10 ~ 4 t) and bottom gas injection (214.28 脳 10 ~ 4 t), and when the top gas injection is selected, The increment of crude oil at 53.43 脳 108m3 is 400.08 脳 104t, which is larger than that of 41.10 脳 108m3 (297.64 脳 104t) and 36.01 脳 108m3 (250.81 脳 104t). A scheme with a small amount of injection; With the increase of injection rate, the oil exchange rate peak at the injection rate of 25 脳 104m3/d. The increment of continuous gas injection is 224.04 脳 10 ~ (4) t, which is larger than that of pulse gas injection with a period of 6 months (171.93 脳 10 ~ (4) t) and that of pulse gas injection with a period of 2 months (173.58 脳 10 ~ (4) t). According to the true fractured XG7 reservoir, the following suggestions are put forward: it is suggested that carbon dioxide should be injected into the top of the reservoir, the injection rate should be between 20 脳 104m3/d-30 脳 104m3/d and the 30 years' gas injection rate should be 40 脳 108m3-50 脳 108m3, if the technical conditions permit, the injection rate should be between 20 脳 104m3/d-30 脳 104m3/d. In the selection of injection mode, priority can be given to continuous gas injection for development. In the process of reservoir development, the development scheme should be designed according to the actual situation of the reservoir. It is hoped that the conclusions and suggestions in this paper can provide some references for gas injection development in fractured reservoirs.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.7

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