低渗透油藏微乳液驱数值模拟参数测定方法研究

发布时间：2018-05-27 19:52

本文选题：微乳液驱 + 数值模拟　；参考：《东北石油大学》2017年硕士论文

【摘要】：目前,微乳液驱的现场应用尚处于试验阶段,还没有在整个油田范围内进行过工业性应用。为了进一步研究微乳液驱油效果并预测其开发效果,通常采用数值模拟的方法。微乳液驱数值模拟研究的关键在于数值模拟参数的确定,而微乳液在地层条件下的物化参数无法直接测得。为了确定真实的物化参数学者们做了大量的研究,确定方法主要是反复的核对静态数据库,结合动态监测资料,参考经验公式计算结果,对参数进行调整。应用上述方法得到物化参数进行历史拟合的确能够得到较好的拟合结果,但微乳液驱数值模拟涉及大量物理化学现象,拟合结果受多个不确定因素影响,以上方法直接对某个参数经验性调整或重新计算,随机性较大,不能满足实际油田开发的精度要求和研究需要。针对这一问题,本文以十二烷基硫酸钠(SDS)、正丁醇、氯化钠与原油配制成的微乳液为例。首先,对该微乳液体系相态进行了研究,主要研究表面活性剂浓度、助表面活性剂浓度、盐度、温度对微乳液相态的影响。此外,模拟低渗透油藏地层条件,测定了微乳液驱数值模拟物化参数(吸附参数、相界面张力、相密度、相粘度)及渗流特征参数(启动压力梯度、相对渗透率曲线)。同时,研究了各参数的影响因素,分析其变化规律。在此基础之上,开展室内实验模拟微乳液驱油过程,通过岩心小尺度数值模拟对上述参数进行敏感性分析。研究结果表明:实验中测量的启动压力梯度与实际情况差别较大。通过对微乳液驱启动压力梯度进行修正,得到的数值模拟计算结果与驱油实验数据拟合较好,说明该参数可以应用在油田数值模拟中。课题的研究使微乳液驱数值模拟能够顺利地在油田中应用。
[Abstract]:At present, the field application of microemulsion flooding is still in the experimental stage, and no industrial application has been carried out in the whole oilfield. In order to further study the oil displacement effect of microemulsion and predict its development effect, numerical simulation is usually used. The key to the numerical simulation of microemulsion flooding is to determine the parameters of the numerical simulation, but the physical and chemical parameters of the microemulsion can not be directly measured under the formation conditions. In order to determine the real physical and chemical parameters scholars have done a lot of research the method is to check the static database repeatedly combined with the dynamic monitoring data reference empirical formula calculation results to adjust the parameters. It is true that good fitting results can be obtained by using the above method to get the historical fitting of physical and chemical parameters, but the numerical simulation of microemulsion flooding involves a large number of physical and chemical phenomena, and the fitting results are affected by many uncertain factors. The above methods can not meet the requirement of precision and research of actual oilfield development because of the randomness of adjusting or recalculating a parameter directly. To solve this problem, the microemulsion of sodium dodecyl sulfate, n-butanol, sodium chloride and crude oil is taken as an example. Firstly, the phase state of the microemulsion system was studied. The effects of surfactant concentration, cosurfactant concentration, salinity and temperature on the phase state of the microemulsion were studied. In addition, the physical and chemical parameters (adsorption parameter, phase interfacial tension, phase density, phase viscosity) and percolation characteristic parameters (starting pressure gradient, relative permeability curve) of microemulsion flooding were measured by simulating the formation conditions of low permeability reservoir. At the same time, the influencing factors of each parameter are studied, and the law of change is analyzed. On this basis, laboratory experiments were carried out to simulate the oil displacement process of microemulsion, and the sensitivity of the above parameters was analyzed by small scale numerical simulation of core. The results show that the threshold pressure gradient measured in the experiment is quite different from the actual situation. By modifying the starting pressure gradient of microemulsion flooding, the numerical simulation results fit well with the oil displacement experimental data, which indicates that this parameter can be applied to the oil field numerical simulation. The numerical simulation of microemulsion flooding can be successfully applied in oil field.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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