基于Level set方法的微观水驱油模拟分析  

Simulation analysis of microscopic water-oil displacement based on Level set method

作　　者：高亚军[1,2] 姜汉桥[1] 王硕亮[2] 李俊键[1] 刘传斌[1] 常元昊 王依诚 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国地质大学(北京)能源学院,北京100083

出　　处：《中国海上油气》2016年第6期59-65,共7页China Offshore Oil and Gas

基　　金：国家重点基础研究发展计划"致密油高效开发油藏工程理论与方法研究(编号:2015CB250905)"部分研究成果

摘　　要：通过引入Level set方法,构建两相界面运移数学表征方法,结合Navier-Stokes方程建立两相微观渗流数学模型,借助有限元方法进行求解,并利用微观玻璃刻蚀模型驱替实验验证数值模拟结果。结果表明,基于该渗流数学模型的数值模拟结果与实验结果的吻合度很高。利用Navier-Stokes方程并结合Level set方法实现了两相流体驱替的微观数值模拟,从而为研究微观两相渗流特征及驱油机理提供了一种新方法。在不等径并联喉道单元模型基础上,进行了不同驱替条件下的数值模拟计算,分析了发生孔隙尺度两相窜流的临界喉道直径比的变化特征,结果表明驱替压差及油水两相黏度比越大,越容易发生微观窜流,更易导致在较小喉道中形成微观残余油。本文研究结果为微观水驱油机理的进一步研究奠定了基础。A new microscopic two-phase seepage flow mathematic model is established and solved with finite element method, in which the movement characteristics of the two-phase interface are characterized with Level set method and Navier-Stokes equation. The numerical simulation is verified by the experiment con-ducted with micro etching glass model. Results show that the numerical simulation results agree well with that of physical experiment. Navier-Stokes equation combined with Level set method implements the micro numerical simulation of two-phase flow, which provides a new method to study micro two-phase seepage characteristics and oil displacement mechanisms. The simulation is carried out under different displacement conditions based on the unequal-diameter parallel pore throat unit model, and the variation characteristics of critical throat diameter ratio under pore-scale two-phase channeling conditions are analyzed. Results show that the larger the displacement pressure and viscosity ratio of the oil-water two-phase are, the easier the micro-channeling occurs, which leads to the formation of microscopic residual oil in the smaller throat. The work lays a foundation for further study of microscopic oil displacement mechanisms.

关 键 词：数值模拟 LEVEL SET方法 微观水驱油 微观残余油 

分 类 号：TE312[石油与天然气工程—油气田开发工程]