共查询到15条相似文献,搜索用时 171 毫秒
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稠油油藏蒸汽-泡沫驱油数值模拟方法 总被引:4,自引:0,他引:4
以室内实验和矿场试验结果为基础,对稠油油藏蒸汽 泡沫驱的渗流机理及所涉及的物理化学现象进行了研究,在常规热采模型的基础上,结合蒸汽泡沫驱数学模型,建立了考虑蒸汽泡沫驱的新热采模型,拓展了热采模型的应用范围.模型中考虑了表活剂浓度、非凝析性气体含量、地层非均质性等影响因素.针对辽河高升油田高二、三区高3456井组油层埋藏较深、油层有效厚度较大的特点,对蒸汽泡沫复合驱进行了数值模拟研究,分析了其敏感因素及其可行性,并对蒸汽泡沫复合驱提高厚层稠油油藏的采收率机理进行了探讨. 相似文献
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考虑扩散和吸附作用的聚合物驱替过程渗流数值模拟 总被引:6,自引:0,他引:6
采用显式求解饱和度、隐式求解浓度的思路,对考虑扩散和吸附作用的聚合物驱替过程渗流模型进行了数值求解.饱和度方程求解应用了显式全变差递减(TVD)法;浓度方程求解过程中,空间项离散采用Crank Nicolson差分格式,时间项变量进行拟线性处理,保证了计算的稳定性.通过与解析解对比,验证了该方法的有效性.计算实例分析表明,扩散使聚合物在溶液中稀释,导致浓度传播分散;吸附使聚合物损耗,导致浓度传播滞后.同时,计算结果直观反映了聚合物驱重要的"油墙"形成机理.在段塞注入情况下,原油富集区在出口端的突破是介于聚合物浓度前缘突破和聚合物浓度峰值突破之间. 相似文献
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Whether polymer flooding can enhance displacement efficiency or not is still a problem under debate. Laboratory experiment, numerical simulation and core data analysis are the commonly used means to study polymer flooding displacement efficiency. We discuss the limitations of these methods and employ molecular tribology to study the problem. The black-white ball action principle, i.e. the atom action model for describing the friction principle, is used to analyse the microscopic mechanism of oil displacement and describe the molecular interactions and displacement power during polymer flooding. Both tribology theory and dynamic theological test show that molecular interactions during polymer flooding are bigger than that during water flooding. It is concluded that displacement efficiency of water flooding may be higher than that of polymer flooding at particular area; while polymer flooding can weaken the heterogeneity significantly, decrease ineffective injection and enhance the total displacement efficiency. 相似文献
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考虑油水两相、生产历史、油藏平面非均质性、井筒储存和表皮效应等因素,建立了生产历史阶段聚合物驱数学模型和不稳定试井阶段的流线模型,用流管法对解释模型进行了数值求解.研究表明:随着油水粘度比的增大,压力及压力导数曲线向上平移,随着生产时间的增加,储层的有效渗透率降低,当高渗透条带沿主流线方向分布时,注水井压降导数曲线反映不出油水前缘的影响,而随着聚合物注入浓度的增大,压力导数曲线下凹出现的越来越早. 相似文献
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A. V. Radaev R. L. Rakhimov I. D. Zakiev A. N. Sabirzyanov 《Russian Journal of Physical Chemistry B, Focus on Physics》2015,9(6):971-977
A mathematical model of the two-phase three-component filtration of the oil–water–supercritical fluid system in a porous medium is developed. The results of numerical simulations of the three-component two-phase filtration during oil displacement by supercritical CO2 from a watered stratum are reported. In the region of oil displacement from watered stratum, there is a significant discrepancy between the experimental and simulation results because of the transient mode of filtration associated with the concurrent saturation of the oil and water with supercritical CO2 under high pressure. In the region of two-phase filtration of the oil–water system and in the region of pumping of three or more pore volumes of supercritical CO2, the deviation of the simulation results from the experimental data does not exceed 10%. 相似文献
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Investigation on Mechanisms of Polymer Enhanced Oil Recovery by Nuclear Magnetic Resonance and Microscopic Theoretical Analysis 总被引:1,自引:0,他引:1 下载免费PDF全文
Polymer flooding is an efficient technique to enhance oil recovery over water flooding. There are lots of discussions regarding the mechanisms for polymer flooding enhancing oil recovery. The main focus is whether polymer flooding can increase sweep efficiency alone, or can increase both of sweep efficiency and displacement efficiency. We present a study on this problem. Oil displacement experiments on 4 natural cores show that polymer flooding can increase oil recovery efficiency by more than 12% over water. Moreover, photos are taken by the nuclear magnetic resonance (NMR) method both after water flooding and after polymer flooding, which show remaining oil saturation distribution at the middle cross section and the central longitudinal section. Analyses of these photos demonstrate that polymer flooding can increase both sweep efficiency and displacement efficiency. 相似文献