人工气顶驱油机理及数值模拟研究

发布时间：2018-05-10 23:25

本文选题：人工气顶 + 驱油机理　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：油藏在经过边底水驱开采或者注水开采后,油藏的油水界面会明显上升。此时油藏低部位的生产井含水率迅速上升,影响生产井的正常生产。但是油藏的高部位仍有大量的剩余油,继续采用原来的开采方式很难将“阁楼油”采出。人工气顶注气驱可以在油藏顶部形成次生气顶,驱替剩余油向下移动,可以有效地采出剩余油,达到提高采收率的目的。本文研究了人工气顶驱油的机理,总结了其主要机理;利用气驱油一维两相数学模型研究了人工气顶前缘运动的规律。利用数值模拟手段研究了概念地质模型中地层倾角和注气速度对人工气顶形态和驱油效果的影响,研究了B块C井区中人工气顶的形态变化和影响驱油的因素。本文所取得成果如下:(1)建立了气驱油一维数学模型,通过求解得到了人工气顶前缘运动的规律。地层压力越大,相同含气饱和度所对应的人工气顶前缘运动距离越大;注气速度越大,人工气顶前缘运动地越快。(2)通过数值模拟手段,建立了概念地质模型,得到了地层倾角与注气速度对人工气顶驱油的影响。采用人工注氮气气顶驱油时,地层倾角在10度左右或者10度以上均可以取得较好的驱油效果,并且地层倾角越大,驱油效果越好;人工气顶的形态随着注气速度的增大而扩展。(3)通过B块C井的数值模拟研究,得到了B块C井最大合理注气速度为日注20000方。在注气量一定的前提下,适当提高注气速度可以增加累产油,提高采收率。建议B块C井采用注气速度为日注15000方~20000方。建议B块C井实施焖井时间不超过3个月。
[Abstract]:The oil-water interface of the reservoir will increase obviously after the side-bottom water flooding or water flooding. At this time, the water cut of the production wells in the low part of the reservoir increases rapidly, which affects the normal production of the production wells. However, there is still a large amount of remaining oil in the high part of the reservoir. It is difficult to produce loft oil by using the original production method. The artificial gas cap injection can form the secondary gas cap at the top of the reservoir and drive the remaining oil downward, which can effectively produce the remaining oil and achieve the purpose of improving the oil recovery. In this paper, the mechanism of artificial gas cap displacement is studied, and its main mechanism is summarized, and the law of front edge movement of artificial gas cap is studied by using one-dimensional two-phase mathematical model of gas displacement. By means of numerical simulation, the effects of formation dip angle and gas injection velocity on the shape of artificial gas cap and oil displacement effect in conceptual geological model are studied. The change of artificial gas cap morphology and the factors affecting oil displacement in block B well C are studied. The results obtained in this paper are as follows: (1) the one-dimensional mathematical model of gas displacement is established, and the law of the leading edge movement of artificial gas cap is obtained by solving the model. The larger the formation pressure, the larger the distance of the front edge of the artificial gas cap corresponding to the same gas saturation; the larger the gas injection velocity, the faster the ground movement of the front edge of the artificial gas cap) the conceptual geological model is established by means of numerical simulation. The effects of formation dip angle and gas injection velocity on artificial gas cap flooding are obtained. When using artificial nitrogen injection to drive oil, the better displacement effect can be obtained when the formation dip angle is about 10 degrees or more, and the bigger the formation dip angle is, the better the displacement effect is. The shape of artificial gas cap expands with the increase of gas injection velocity. (3) through the numerical simulation of B block C well, the maximum reasonable gas injection rate of B block C well is 20000 square meters per day. Under the premise of certain gas injection rate, increasing gas injection speed can increase cumulative oil production and oil recovery. It is suggested that the gas injection velocity of B block C well should be 15000 square to 20000 square a day. It is suggested that the braising time of B block C well should not be more than 3 months.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.7

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