本文關(guān)鍵詞： 影響因素 特高含水期 水驅(qū)規(guī)律曲線 遞減曲線 聯(lián)解模型　出處：《東北石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：經(jīng)過多年的開發(fā),大慶油田薩中開發(fā)區(qū)已經(jīng)進(jìn)入特高含水期,并且產(chǎn)量逐年遞減。目前較為突出的開發(fā)問題是注水利用效率低、剩余油挖潛難度大、產(chǎn)量遞減快等問題。因此,對(duì)該區(qū)塊的注水調(diào)整、剩余油識(shí)別、生產(chǎn)指標(biāo)預(yù)測(cè)以及開發(fā)效果評(píng)價(jià)成為油田工作的重心。本文從相對(duì)滲透率的影響因素入手,考慮到特高含水期注水量大、注水利用率低等特點(diǎn),著重研究了長(zhǎng)期沖刷下特高含水期的油水相對(duì)滲透率變化,分析了長(zhǎng)期沖刷、壓力梯度、巖石學(xué)特征以及粘土礦物對(duì)相對(duì)滲透率曲線的影響。同時(shí)從地質(zhì)和開發(fā)兩方面分析了特高含水期含水率變化的影響因素,其中高滲透條帶、非均質(zhì)性等是影響特高含水期含水率變化的主要因素。最后對(duì)驅(qū)替特征影響因素進(jìn)行了研究,分析發(fā)現(xiàn)驅(qū)替速度、凈覆壓和兩相啟動(dòng)壓力梯度是驅(qū)替特征的主要影響因素。本文在大量調(diào)研現(xiàn)場(chǎng)數(shù)據(jù)的基礎(chǔ)上,分區(qū)域研究薩中開發(fā)區(qū)的水驅(qū)規(guī)律。通過對(duì)生產(chǎn)井史資料的分析,發(fā)現(xiàn)在三次井網(wǎng)加密后的一段時(shí)間內(nèi),油田進(jìn)入特高含水期,水驅(qū)規(guī)律在此時(shí)進(jìn)入新的模式。本文以進(jìn)入特高含水期為起始點(diǎn),分別從甲型、乙型、丙型和丁型水驅(qū)規(guī)律曲線等四個(gè)方面對(duì)薩中開發(fā)區(qū)各區(qū)域的水驅(qū)規(guī)律進(jìn)行分析,通過數(shù)據(jù)擬合以及數(shù)據(jù)差異對(duì)比,分別優(yōu)選出薩中開發(fā)區(qū)12個(gè)區(qū)域的水驅(qū)曲線類型。同樣采用數(shù)據(jù)擬合和數(shù)據(jù)差異對(duì)比的方法,分別對(duì)薩中開發(fā)區(qū)各區(qū)域進(jìn)行產(chǎn)量遞減規(guī)律分析。本研究以三次井網(wǎng)加密完成后產(chǎn)量開始遞減的時(shí)刻為初始產(chǎn)量來研究遞減規(guī)律,除去生產(chǎn)措施、生產(chǎn)制度的影響,從指數(shù)遞減、雙曲遞減、調(diào)和遞減三個(gè)方面來對(duì)生產(chǎn)數(shù)據(jù)進(jìn)行擬合,通過分析發(fā)現(xiàn),薩中開發(fā)區(qū)各區(qū)塊在特高含水期的產(chǎn)量多以指數(shù)形式遞減,規(guī)律明顯,數(shù)據(jù)擬合較好。為了得到含水率和產(chǎn)量隨時(shí)間變化的模型,將水驅(qū)規(guī)律曲線和產(chǎn)量遞減曲線進(jìn)行聯(lián)解。根據(jù)已獲得的薩中開發(fā)區(qū)各區(qū)塊的水驅(qū)規(guī)律曲線類型和產(chǎn)量遞減類型,聯(lián)解相應(yīng)曲線的理論模型,得到各區(qū)塊可用的含水率及產(chǎn)量預(yù)測(cè)模型。通過對(duì)比擬合精度發(fā)現(xiàn),聯(lián)解得到的預(yù)測(cè)模型具有更高的預(yù)測(cè)精度和更好的適應(yīng)性。
[Abstract]:After years of development, Sazhong Development Zone of Daqing Oilfield has entered an extremely high water cut period, and the production is decreasing year by year. At present, the outstanding development problems are low water injection efficiency and difficulty in tapping the potential of remaining oil. Therefore, the adjustment of water injection, the identification of remaining oil, the prediction of production index and the evaluation of development effect become the focus of oilfield work. This paper starts with the influencing factors of relative permeability. Considering the characteristics of large water injection rate and low water injection utilization rate in the ultra-high water cut period, the changes of relative permeability of oil and water during the ultra-high water cut period under long term scour are studied, and the long-term scour and pressure gradient are analyzed. The characteristics of petrology and the influence of clay minerals on the relative permeability curve are also analyzed. Heterogeneity is the main factor that affects water cut change in high water cut period. Finally, the influence factors of displacement characteristics are studied, and the displacement velocity is found by analysis. Net overburden and two-phase start-up pressure gradient are the main influencing factors of displacement characteristics. Based on a large number of field data, this paper studies the law of water flooding in Sazhong Development Zone, and analyzes the production well history data. It is found that in a period of time after the third well pattern infill, the oil field enters into the extra high water cut period, and the water drive law enters a new pattern at this time. This paper starts with entering the extra high water cut period, from type A to type B, respectively. The water drive law of each area in Sazhong Development Zone is analyzed from four aspects, namely, C type and Ding type water drive law curve. The data fitting and data difference comparison are carried out. The types of water drive curves in 12 areas of Sazhong Development Zone were selected respectively. The methods of data fitting and data difference comparison were also used. Based on the analysis of production decline law in each area of Sazhong Development Zone, this study takes the time of production decline after the completion of triple well pattern infilling as the initial production to study the decline law and remove the production measures. The influence of production system, from exponential decline, hyperbolic decline, harmonic decline to fit the production data, through analysis found. In order to get the model of water content and output with time, the output of each block in Sazhong Development Zone decreases exponentially, the rule is obvious, and the data fit well. Combining the water drive curve with the production decline curve, the theoretical model of the corresponding curve is given according to the obtained water drive law curve type and production decline type of each block in Sazhong Development Zone. The prediction models of water cut and output of each block are obtained, and by comparing the fitting accuracy, it is found that the prediction model obtained by the combined solution has higher prediction accuracy and better adaptability.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE357.6
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本文編號(hào)：1476099