發(fā)布時間：2018-05-13 00:11

  本文選題：裂縫性油藏 + 注氣驅(qū)　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：裂縫性油藏在世界石油和天然氣的產(chǎn)量和儲量中都占有十分重要的地位。世界原油總產(chǎn)量的三分之一以上采自裂縫性油藏。裂縫性油藏是一種復(fù)雜的油藏類型,尤其是該類油藏表現(xiàn)出強非均質(zhì)性,且裂縫系統(tǒng)和基質(zhì)系統(tǒng)在儲集和滲流方面存在較大差異,導(dǎo)致該類油藏注水開發(fā)效果并不是很理想。近年來,注氣驅(qū)越來越多的應(yīng)用到油藏開發(fā)中,而氣驅(qū)開發(fā)的很多優(yōu)勢在裂縫性油藏中也得到體現(xiàn)。 本文在參閱大量國內(nèi)外文獻的基礎(chǔ)上,從裂縫性油藏的注氣影響因素以及驅(qū)油機理方面出發(fā),對裂縫性油藏注氣開發(fā)過程進行詳細地理論剖析,運用數(shù)值模擬手段,在建立XG7裂縫性油藏孔隙-裂縫雙重介質(zhì)模型的基礎(chǔ)上,對XG7裂縫性油藏的注入介質(zhì)、注入部位、注入量、注入速度、注入方式等進行了方案設(shè)計與分析。 模擬結(jié)果表明：在頂部注氣時,注二氧化碳相對于衰竭式開發(fā)的原油增量267.20×104t,高于注烴氣開發(fā)的原油增量259.15×104t還要高出近7×104t,和注氮氣開發(fā)的原油增量250.84×104t,在腰部和底部注氣時二氧化碳的各項參數(shù)同樣優(yōu)于注烴氣和注氮氣；對比不同注入部位時發(fā)現(xiàn),頂部注氣開發(fā)油藏相對于衰竭式開發(fā)的原油增量250.84×104t,高于腰部注氣開發(fā)的原油增量224.12×104t和底部注氣開發(fā)的原油增量214.28×104t；當選擇頂部注氣時,注入量為53.43×108m3時相對于衰竭式開發(fā)的原油增量為400.08×104t,該值大于注入量為41.10×108m3時的原油增量297.64×104t和注入量為36.01×108m3時的原油增量250.81×104t,底部注氣時注入量大的方案各項參數(shù)同樣優(yōu)于注入量小的方案；隨著注入速度的增加,在注入速度為25×104m3／d時換油率出現(xiàn)峰值；對比不同注入方式發(fā)現(xiàn),連續(xù)注氣相對于衰竭式開發(fā)的原油增量為224.04×104t,大于周期為6個月的脈沖注氣的原油增量171.93×104t,和周期為2個月的脈沖注氣的原油增量173.58×104t。 針對XG7真實裂縫性油藏,提出以下幾點建議：在技術(shù)條件允許的情況下建議向油藏頂部注二氧化碳,注入速度優(yōu)選20×104m3/d-30×104m3/d之間,建議30年的注氣量在40×108m3-50×108m3之間。在選擇注入方式時,可以優(yōu)先選擇連續(xù)注氣進行開發(fā)。在油藏開發(fā)過程中,應(yīng)結(jié)合油藏的實際情況進行開發(fā)方案設(shè)計。希望本文中的結(jié)論和建議能夠為裂縫性油藏注氣開發(fā)提供一定的參考依據(jù)。
[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.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.7

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