本文選題：注烴氣 + 混相機理　； 參考：《西南石油大學》2017年碩士論文

【摘要】：塔里木油田東河塘油藏于2014年開始烴氣驅開發(fā),試驗區(qū)增產效果好,準備在更大范圍內推廣烴氣驅開發(fā)方式。本文以東河塘油藏注烴氣試驗區(qū)為研究對象,在中石油"東河塘注氣開發(fā)跟蹤評價與注采參數(shù)優(yōu)化研究"項目資助下完成,以評價該區(qū)塊烴氣混相驅的開發(fā)效果。基于室內實驗數(shù)據及現(xiàn)場實際生產資料,建立了實驗及實際油藏數(shù)值模型,分析了該油藏注氣后的剩余油分布規(guī)律;利用P-X相圖法、擬三元相圖法以及細管特征曲線等3種方法分析了注烴氣混相驅油機理,利用非線性擬合方法建立了新的貧氣驅最小混相壓力預測模型;通過細管及長巖心實驗數(shù)值模型,分析了影響混相帶體積的各個參數(shù),同時以所計算的30組數(shù)據為基礎建立了預測混相帶大小的經驗公式,并得到了實際油藏模型的檢驗;最后在準確計算混相帶體積的基礎上,推導了考慮相間傳質的混相驅物質平衡方程。本文在以上的研究內容及分析結果基礎上,獲得了以下認識:(1)傳統(tǒng)的物質平衡方程應用在油藏混相驅時存在缺陷,本文建立了考慮相間傳質的混相驅物質平衡方程,并得到了室內實驗數(shù)據的驗證;(2)利用本文所建立的混相帶大小預測公式,可計算出烴氣驅混相帶大小,為現(xiàn)場的動態(tài)分析提供參考;(3)油藏注烴氣時,注氣量、地層壓力及滲透率均會影響混相帶大小,而注氣速度對混相帶大小并無明顯影響;注氣量越大,混相帶越長,呈線性關系,.地層壓力越大,混相帶越長,呈線性關系;滲透率越大,混相帶越長,呈自然對數(shù)關系,但且當滲透率大于一定值時變化很小;(4)現(xiàn)有的注烴氣驅最小混相壓力計算經驗公式在計算貧氣驅時精度有限,本文基于23組貧氣驅實驗樣本數(shù)據建立的最小混相壓力計算模型提高了預測精度;非混相時的油氣過渡帶比混相時的長,非混相時注入氣突破后氣油比上升的相對緩慢;(5)注入烴氣后,原油中的中間烴類組分C2～C6被抽提至注入氣中,注入氣密度、粘度增加,地層原油粘度降低,屬于蒸發(fā)氣驅混相;(6)通過實際油藏數(shù)值模型,分析了東河塘油藏注氣井組的動態(tài)情況,并進行了其剩余油分布規(guī)律研究。
[Abstract]:The development of hydrocarbon gas drive began in 2014 in Donghetang reservoir of Tarim oil field. The experiment area has good effect on increasing production and is ready to popularize the development mode of hydrocarbon gas drive in a wider range. In order to evaluate the development effect of hydrocarbon gas miscible flooding in Donghetang reservoir, the experimental area of hydrocarbon injection gas injection in east Hetang reservoir is studied in this paper, and it is funded by CNPC project "tracking evaluation of gas injection development and optimization of injection-production parameters". Based on the laboratory experimental data and field production data, the numerical model of experimental and actual reservoir is established, and the distribution of remaining oil after gas injection is analyzed, and the P-X phase diagram method is used to analyze the distribution of remaining oil in the reservoir. The mechanism of hydrocarbon injection gas miscible flooding is analyzed by using pseudo-ternary phase diagram method and thin tube characteristic curve, and a new prediction model of minimum miscible pressure of lean gas flooding is established by nonlinear fitting method. The parameters affecting the volume of the miscible zone are analyzed, and an empirical formula for predicting the size of the miscible zone is established on the basis of the calculated 30 sets of data, and the test of the actual reservoir model is obtained, and finally, on the basis of the accurate calculation of the volume of the miscible zone, the empirical formula for predicting the size of the miscible zone is established. The mass balance equation of miscible flooding considering mass transfer between phases is derived. On the basis of the above research and analysis results, this paper has obtained the following understanding: 1) the traditional mass balance equation has defects in the application of miscible flooding in oil reservoir. In this paper, the mass transfer equation of miscible flooding is established. By using the prediction formula of the size of the miscible zone established in this paper, the size of the hydrocarbon gas drive miscible zone can be calculated, which can provide a reference for the field dynamic analysis of the gas injection in the gas injection gas reservoir. Both formation pressure and permeability will affect the size of the miscible zone, while the gas injection velocity has no obvious effect on the size of the miscible zone, and the larger the gas injection rate, the longer the miscible zone, which shows a linear relationship. The larger the formation pressure is, the longer the miscible zone is, and the longer the permeability is, the longer the miscible zone is. However, the existing empirical formulas for calculating the minimum miscible pressure of hydrocarbon injection gas drive are limited in accuracy when the permeability is greater than a certain value. In this paper, the minimum miscible pressure calculation model based on 23 sets of sample data of lean gas drive improves the prediction accuracy, and the oil and gas transition zone in immiscible phase is longer than that in miscible phase. After injection of hydrocarbon gas, the intermediate hydrocarbon component (C2~C6) in crude oil is extracted into the injected gas, the density of injected gas increases, the viscosity increases, and the viscosity of formation crude oil decreases. Based on the actual reservoir numerical model, the performance of gas injection well group in Donghetang reservoir is analyzed, and the distribution law of remaining oil is studied.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE357.45

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1 馬雪巖;H油田注CO_2混相驅油模擬研究[D];西南石油大學;2016年

2 許清華;東河塘油藏烴氣混相驅機理及混相特征研究[D];西南石油大學;2017年

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本文編號：1950549