东河塘油藏烃气混相驱机理及混相特征研究

发布时间：2018-05-29 10:31

本文选题：注烃气 + 混相机理　；参考：《西南石油大学》2017年硕士论文

【摘要】：塔里木油田东河塘油藏于2014年开始烃气驱开发,试验区增产效果好,准备在更大范围内推广烃气驱开发方式。本文以东河塘油藏注烃气试验区为研究对象,在中石油"东河塘注气开发跟踪评价与注采参数优化研究"项目资助下完成,以评价该区块烃气混相驱的开发效果。基于室内实验数据及现场实际生产资料,建立了实验及实际油藏数值模型,分析了该油藏注气后的剩余油分布规律;利用P-X相图法、拟三元相图法以及细管特征曲线等3种方法分析了注烃气混相驱油机理,利用非线性拟合方法建立了新的贫气驱最小混相压力预测模型;通过细管及长岩心实验数值模型,分析了影响混相带体积的各个参数,同时以所计算的30组数据为基础建立了预测混相带大小的经验公式,并得到了实际油藏模型的检验;最后在准确计算混相带体积的基础上,推导了考虑相间传质的混相驱物质平衡方程。本文在以上的研究内容及分析结果基础上,获得了以下认识:(1)传统的物质平衡方程应用在油藏混相驱时存在缺陷,本文建立了考虑相间传质的混相驱物质平衡方程,并得到了室内实验数据的验证;(2)利用本文所建立的混相带大小预测公式,可计算出烃气驱混相带大小,为现场的动态分析提供参考;(3)油藏注烃气时,注气量、地层压力及渗透率均会影响混相带大小,而注气速度对混相带大小并无明显影响;注气量越大,混相带越长,呈线性关系,.地层压力越大,混相带越长,呈线性关系;渗透率越大,混相带越长,呈自然对数关系,但且当渗透率大于一定值时变化很小;(4)现有的注烃气驱最小混相压力计算经验公式在计算贫气驱时精度有限,本文基于23组贫气驱实验样本数据建立的最小混相压力计算模型提高了预测精度;非混相时的油气过渡带比混相时的长,非混相时注入气突破后气油比上升的相对缓慢;(5)注入烃气后,原油中的中间烃类组分C2～C6被抽提至注入气中,注入气密度、粘度增加,地层原油粘度降低,属于蒸发气驱混相;(6)通过实际油藏数值模型,分析了东河塘油藏注气井组的动态情况,并进行了其剩余油分布规律研究。
[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.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.45

【相似文献】