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针对一些开发中后期水驱油田区块生产气油比异常升高的问题,为研究采出液含水对生产气油比的影响规律,采用从油田获取的油、气、水样品,开展了模拟地层流体高压物性测试、水驱油等一系列物理模拟实验。结果表明,在充分搅拌的条件下,模拟地层油的饱和压力和溶解气油比随水的注入而降低,且降低的幅度随含水质量分数的增加而增大。当含水质量分数为60%时,模拟地层油的饱和压力降低5.92%,溶解气油比降低9.78%,溶解气水比为2.065 cm3/g。无搅拌条件下,溶解气水比随水-油接触时间的增加而逐渐增大,注入水与模拟油静置接触约24 h,水中的溶气量达到稳定,表明注入水从注入到产出在地层运移过程中与原油接触可从油相获取气体而成为含气水。模拟采出液在地层条件下的折算溶解气油比随模拟采出液含水率的升高逐渐升高。在出口压力高于饱和压力的岩心驱替实验过程中,当含水率超过95%时,生产气油比随采出液含水率的增大而急剧升高,表明采出液高含水时,采出液含水率的变化对生产气油比具有较大的影响。 相似文献
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In the gas industries, to increase the degree of accuracy of calculation and estimation in different processes, the importance of accurate prediction of gas properties is highlighted. The gas density, as one of the key properties in gas engineering, has a major effect in calculations. So, in the present paper, multi-layer perceptron artificial neural network (MLP-ANN) was used to predict the gas density based on molecular weight, critical pressure and critical temperature of gas, pressure, and temperature. To this end, a total number of 1240 reliable data of gas density were gathered from literature for the training and testing phases. The MLP-ANN outputs were compared with the actual data in different manners, such as statistical and graphical analyses. The coefficient of determination (R2), average absolute relative deviation (AARD), and root mean squared error (RMSE) for overall process were calculated as 1, 0.0088444, and 0.0259, respectively. The determined parameters and graphical analysis showed that the MLP-ANN has great potential and high degree of accuracy in gas density estimation. 相似文献
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AbstractThe viscosity of fluid is known as resistivity of fluid to flow and straightly affected by temperature and pressure. As it is obvious, the viscosity of reservoir fluid is known as one of the critical parameters which extensively effect on production. Therefore, in the present paper, multilayer perceptron artificial neural network (MLP-ANN) is used as a novel and accurate model to predict dynamic viscosity of normal alkanes in the operational conditions. To this end, 228 dynamic viscosity points as function of carbon number of n-alkane, temperature, and pressure were collected from a reliable paper. The comparison between MLP-ANN outputs and experimental dynamic viscosities is performed in graphical and statistical manners. The calculated coefficients of determination 0.99739 and 0.99051 for training and testing phases express the great ability of MLP-ANN algorithm in prediction of dynamic viscosity of n-alkane. According to the analysis, MLP-ANN has enough accuracy and potential to be used as software for which applicable in petroleum industry. 相似文献
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Alireza Baghban Rasoul Hekmati Mahdi Hajiali Majid Kamyab 《Petroleum Science and Technology》2018,36(16):1272-1277
Sedimentation of heavy fractions of oil such as asphaltene is the main concern in different parts of petroleum industries like production and transportation. Due to this fact, the inhibition of asphaltene precipitation becomes one of the great interests in the petroleum industry. In the present investigation, multi-layer perceptron artificial neural network (MLP-ANN) was developed to estimate asphaltene precipitation reduction as a function of concentration and kind of inhibitors and oil properties. To this end, a total number of 75 data points were extracted from reliable source for training and validation of predicting algorithm. The outputs of MLP-ANN were compared with experimental data graphically and statistically, the determined coefficients of determination (R2) for training and testing are 0.996522 and 0.995239 respectively. These comparisons expressed the high quality of this algorithm in the prediction of asphaltene precipitation reduction. so the MLP-ANN can be used as a powerful machine for estimation of different processes in petroleum industries. 相似文献
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油藏流体特征参数研究是储量研究工作的基础。根据探井测得的原始地层压力与高压物性分析资料确定的饱和压力间的相互关系,将油藏划分为饱和油藏与未饱和油藏两大类。饱和油藏与未饱和油藏流体特征参数变化规律的差异在于原始溶解气油比和地层原油体积系数随深度的变化规律是相反的,二者相同之处在于地层压力、地层温度及地层原油密度随深度的增加而增大。当PVT样品点分布不均匀时,储量评估中应选取油藏几何中心点对应的参数值;对于目标油藏,至少应获取两个以上合格的PVT资料,并结合流体分布特征合理确定油藏流体特征参数。 相似文献
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Abstract Pressure–volume–temperature (PVT) properties of crude oil are essential parameters used for prediction of fluid flow both in porous media and through transmission pipelines. Whenever laboratory works are absent, the engineer should use regionally developed correlations. A large portion of all crude oil resources is located in the Persian Gulf countries, and they have more or less similar API ranges and acidities, so that any empirical PVT correlation based on data from one region can adequately predict the behavior of others in this large geological basin. In this study, a new set of black oil–type correlations for bubble point pressure (Pb), solution gas–oil ratio (GOR; Rs), and formation volume factor (Bo) is proposed based on more than 400 Iranian crude oil PVT lab data. Moreover, previous works were reviewed, most of which were not suitable to model Iranian crude PVT behavior. Although the new correlations are developed over Iranian crudes, they can be used for prediction over any crude oil with similar compositional properties (API and acidity). Then the accuracy of these correlations is compared with the newly presented set and the superiority of this work for predicting those parameters is demonstrated. 相似文献
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石油流体弹性参数的实验研究 总被引:3,自引:0,他引:3
油气开采活动会引起油气藏的性态发生变化,如果对变化过程不甚了解,可能会造成地震资料的错误解释。为此,利用胜利油田和塔河油田的12份原油样品(轻质油6份),以及配制的8份含溶解气的石油样品,在实验室测量了样品的地震特征,分析了温度,压力和溶解气对石油速度和密度的影响规律,利用已知石油的地面密度,气油比,气体密度等参数建立了石油速度和密度计算模型。将计算结果与B-W模型的计算结果进行了对比,结果表明,由本模型得到的速度和密度更符合实验数据。 相似文献
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Up to now, there has not been one specific correlation published to directly estimate the bubble-point pressure in the absence of pressure-volume-temperature (PVT) analysis. Presently, there is just one published correlation available to estimate the bubble-point oil formation volume factor (FVF) directly in the absence of PVT analysis. Multiple regression analysis technique is applied to develop two novel correlations to estimate the bubble-point pressure and the bubble-point oil FVF. The developed correlations can be applied in a straightforward manner by using direct field measurement data. Separator gas oil ratio, separator pressure, stock-tank oil gravity, and reservoir temperature are the only key parameters required to predict bubble-point pressure and bubble-point oil FVF. 相似文献
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凝析气藏流体的露点压力受到许多因素的影响,如流体组分、气油比、多孔介质、非平衡效应等。不同组分对流体露点压力的影响程度不尽相同,其中C3、C4、H2S等组分的影响很明显。气油比对露点压力具有双重效应,当气油比低于某一数值时,露点压力随气油比增大而增加;当高于此数值时,露点压力又随气油比增大而减小。关于多孔介质对流体露点压力的影响的认识还存在相互矛盾。流体的相态受到组分和组成的极大影响,在生产过程中,近井周围流体的组成在不断变化,从而导致近井周围出现复杂的相态变化。对凝析气露点压力的确定方法及其影响因素的深入研究,将有助于正确评价凝析气藏的生产动态特征。 相似文献
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为研究CO2辅助蒸汽吞吐技术开发超稠油中CO2的作用,以郑411区块超稠油为研究对象,通过注气膨胀实验系统地研究了不同CO2注入量、温度及压力下,超稠油物性的变化规律,并使用多元回归方法分别建立了溶解气油比、饱和压力、原油黏度、原油密度及原油体积系数与CO2注入量、温度及压力的关系模型,拟合优度均在0.90以上。郑411块超稠油的溶解气油比随CO2注入量的增加而线性增加;饱和压力随CO2注入量的增加而线性增加,随温度增加而呈乘幂趋势增加;原油黏度随CO2注入量增加而呈指数趋势降低,其对数值随温度升高呈乘幂趋势降低;原油密度随CO2注入量增加呈指数趋势降低,随温度升高呈对数趋势降低,随压力增加而线性增加;原油体积系数随CO2注入量和温度的增加均呈指数趋势增加,随压力增加而线性减小。超稠油对温度有极强的敏感性,加热升温能显著降低超稠油黏度,提高其流动性;同时,CO2溶解降黏、膨胀原油的特性,能改善原油物性,有助于超稠油的动用。 相似文献
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Viscosity is known as one of major properties of fluids which have straight effects on different parts of chemical and petroleum industries. Due to this importance, in the present work, adaptive neuro-fuzzy interference system (ANFIS) was coupled with genetic algorithm (GA) to predict dynamic viscosity of normal alkane in terms of molecular weight of n-alkane, temperature and pressure. In order to prepare and validate the predicting model 228 experimental data points were extracted from the literature. The outputs of this predictive tool were compared with the experimental data and comparisons showed that predicted dynamic viscosities have good agreement with experimental data. According to the statistical and graphical analyses this simple tool can be used as a rigorous and accurate method for prediction of dynamic viscosity of n-alkane, especially at reservoir conditions. 相似文献
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油藏数值模拟中的不收敛问题 总被引:1,自引:0,他引:1
计算不收敛是油藏数值模拟中经常碰到的问题,而识别不收敛的原因并给以解决,能极大地提高油藏数值模拟的质量和效率。本文在静态地质模型、网格设计、流体PVT数据、岩石相渗曲线、井轨迹等方面,对计算不收敛的可能原因进行了分析,并提供了相应的解决方法。 相似文献
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M. Riyahin G. M. Montazeri L. Jamoosian F. Farahbod 《Petroleum Science and Technology》2013,31(6):703-711
Pressure-volume-temperature (PVT) properties are necessary to reservoir engineering calculations in porous media and it is important for calculations in pipeline as well. This work presents a new set of correlation for estimating Iranian Crude oils properties based on some experimental data. Whenever there is no representative experimental PVT data, these correlations can be used for oils of API ranging between 15 and 30. New correlations was developed to calculate oil formation volume factor (Bo), bubble point pressure (Pb), and solution gas oil ratio (Rs). Finally, a comparison is made between these correlations and other published correlations such as Standing, Vazquez and Beggs, Glaso, Farshad et al., Al Marhoun, Petrosky and Farshad, and Hanafi et al. and it is found out that the new correlations are more accurate than the other ones. 相似文献