二元复合驱油藏后续水驱改善开发效果研究

发布时间：2018-01-05 17:36

本文关键词：二元复合驱油藏后续水驱改善开发效果研究　出处：《中国石油大学(华东)》2015年硕士论文　论文类型：学位论文

【摘要】：二元复合驱技术充分发挥了聚合物改善水油流度比和表面活性剂降低油水界面张力的作用,在胜利油田得到了大规模应用且取得了较好的降水增油效果。随着开发的不断深入,部分区块注二元复合体系结束后已进入后续水驱阶段。从较早注二元复合驱单元的跟踪分析可知,后续水驱阶段增油量占整个二元复合驱增油量的30%以上。因此,对二元复合驱油藏后续水驱阶段动态变化规律进行分析,研究影响该阶段开发效果的注采参数及变化规律,进而制定后续水驱开发阶段的合理注采调控措施,对提高二元驱油藏后续水驱阶段的开发效果十分重要。本文首先基于胜利油田实施二元驱后续水驱典型区块的实际矿场数据,对注入压力、每米视吸水指数、无因次产液量和含水率等注采动态参数的变化规律进行分析,建立了含水率和月增油量的定量表征模型,并对实施后续水驱六个区块的含水率和月增油量变化进行了拟合和表征。由于孤岛各区块是在注聚开发的基础上进行二元复合驱开发,物质基础较差,而孤东各区块是在水驱开发的基础上进行二元复合驱开发,物质基础相对较好。因此,孤东区块含水率下降幅度大,有效期长,增油量大,开发效果较好。在注采动态变化规律认识的基础上,优选了二元驱油藏后续水驱典型开发单元,建立了油藏数值模拟模型。基于二元驱基础方案研究了注采动态参数对后续水驱开发效果的影响,分析了注二元复合体系及后续水驱阶段不同注入速度和注采比对开发效果的影响。在典型区块数值模型的基础上,建立了概念数值模型,分析了后续水驱阶段产液指数恢复率和吸水指数恢复率的变化规律,讨论了不同地质及开发参数对两者的影响并进行了敏感性分析。在二元驱后续水驱典型区块数值模拟模型基础上,讨论了井网加密、分层注水、井网抽稀、提液、油井转注和配产配注等单措施及组合措施对后续水驱增产效果的影响。从经济效益角度出发,以最大财务净现值为目标,计算了不同油价下各调整措施的财务净现值,从而建立了不同油价经济效益达最大化条件下对应的调整措施。结果表明,对进行二元驱后续水驱的区块,当油价较低时采用配产提液抽稀,当油价较高时采用配产提液加密抽稀的调整措施可获得较大的产油量和较高的经济效益。
[Abstract]:The binary composite flooding technology can improve the water / oil mobility ratio and the surfactant to reduce the oil / water interfacial tension. It has been applied in Shengli oilfield on a large scale and achieved good effect of precipitation and oil increasing. After the completion of the binary flooding system in some blocks, it has entered the stage of subsequent water flooding. From the trace analysis of the early injection binary composite flooding unit, we can know. The oil increment in the follow-up water flooding stage accounts for more than 30% of the total oil increment in the binary composite flooding. Therefore, the dynamic change law of the following water flooding stage in the binary composite flooding reservoir is analyzed. This paper studies the injection-production parameters and their changing rules that affect the development effect of this stage, and then formulates the reasonable injection-production regulation measures in the subsequent stage of water drive development. It is very important to improve the development effect of the subsequent water flooding stage of binary flooding reservoir. Firstly, based on the actual field data of typical blocks of water flooding in Shengli Oilfield, the injection pressure and apparent water absorption index per meter are analyzed. The variation law of injection-production dynamic parameters such as dimensionless liquid yield and water cut is analyzed and the quantitative characterization model of water cut and monthly oil increment is established. The changes of water cut and monthly oil increment in six blocks of follow-up water flooding were fitted and characterized. Because each block of Gudao was developed by binary compound flooding on the basis of polymer injection, the material foundation was poor. Gudong block is based on water drive development of binary composite flooding, the material basis is relatively good. Therefore, the Gudong block water cut down a large extent, the validity period is long, increase the amount of oil. On the basis of understanding the rule of dynamic change of injection and production, the typical development unit of water flooding in binary flooding reservoir is selected. The reservoir numerical simulation model is established. Based on the basic scheme of binary flooding, the effect of injection-production dynamic parameters on the subsequent water drive development is studied. The effects of different injection rate and injection-production ratio on the development of binary injection-binary composite system and subsequent water drive stage are analyzed. Based on the typical block numerical model, the conceptual numerical model is established. The changes of recovery rate of liquid production index and water absorption index in subsequent water flooding were analyzed. The effects of different geological and development parameters on them are discussed and sensitivity analysis is carried out. Based on the numerical simulation model of typical blocks of binary flooding, the well pattern infill, stratified water injection and well pattern pumping are discussed. The effect of single measures and combination measures such as liquid extraction, oil well transfer injection and production distribution injection on the effect of subsequent water drive production increase. From the point of view of economic benefit, the maximum financial net present value is the goal. The financial net present value of the adjustment measures under different oil prices is calculated, and the corresponding adjustment measures under the condition of maximizing the economic benefits of different oil prices are established. When the oil price is low, the oil production can be diluted by using the mixed extraction liquid, and when the oil price is high, the oil production will be larger and the economic benefit will be higher by adopting the adjustment measures of the encryption and thinning of the oil mixture.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6

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