發(fā)布時(shí)間：2018-05-10 23:25

  本文選題：人工氣頂 + 驅(qū)油機(jī)理　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：油藏在經(jīng)過(guò)邊底水驅(qū)開(kāi)采或者注水開(kāi)采后,油藏的油水界面會(huì)明顯上升。此時(shí)油藏低部位的生產(chǎn)井含水率迅速上升,影響生產(chǎn)井的正常生產(chǎn)。但是油藏的高部位仍有大量的剩余油,繼續(xù)采用原來(lái)的開(kāi)采方式很難將“閣樓油”采出。人工氣頂注氣驅(qū)可以在油藏頂部形成次生氣頂,驅(qū)替剩余油向下移動(dòng),可以有效地采出剩余油,達(dá)到提高采收率的目的。本文研究了人工氣頂驅(qū)油的機(jī)理,總結(jié)了其主要機(jī)理;利用氣驅(qū)油一維兩相數(shù)學(xué)模型研究了人工氣頂前緣運(yùn)動(dòng)的規(guī)律。利用數(shù)值模擬手段研究了概念地質(zhì)模型中地層傾角和注氣速度對(duì)人工氣頂形態(tài)和驅(qū)油效果的影響,研究了B塊C井區(qū)中人工氣頂?shù)男螒B(tài)變化和影響驅(qū)油的因素。本文所取得成果如下:(1)建立了氣驅(qū)油一維數(shù)學(xué)模型,通過(guò)求解得到了人工氣頂前緣運(yùn)動(dòng)的規(guī)律。地層壓力越大,相同含氣飽和度所對(duì)應(yīng)的人工氣頂前緣運(yùn)動(dòng)距離越大;注氣速度越大,人工氣頂前緣運(yùn)動(dòng)地越快。(2)通過(guò)數(shù)值模擬手段,建立了概念地質(zhì)模型,得到了地層傾角與注氣速度對(duì)人工氣頂驅(qū)油的影響。采用人工注氮?dú)鈿忭旘?qū)油時(shí),地層傾角在10度左右或者10度以上均可以取得較好的驅(qū)油效果,并且地層傾角越大,驅(qū)油效果越好;人工氣頂?shù)男螒B(tài)隨著注氣速度的增大而擴(kuò)展。(3)通過(guò)B塊C井的數(shù)值模擬研究,得到了B塊C井最大合理注氣速度為日注20000方。在注氣量一定的前提下,適當(dāng)提高注氣速度可以增加累產(chǎn)油,提高采收率。建議B塊C井采用注氣速度為日注15000方~20000方。建議B塊C井實(shí)施燜井時(shí)間不超過(guò)3個(gè)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.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357.7

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