自发渗吸时间标度归一化处理方法

全面梳理了近年来国内外自发渗吸过程时间归一化处理方法研究进展，从渗吸作用原理出发，分析了各类方法的修正扩展形式；同时，基于岩芯尺度经验和理论归一化模型，深入分析了现场应用中适用性及存在的问题，详细总结并归纳了具有代表性的无因次模型及其边界约束条件。结果表明：(1) 毛管力和重力是渗吸的主要作用机制，多数致密油藏渗吸过程受两者混合机制控制；(2) 对于致密孔隙介质，岩芯时间标度归一化模型结果和实际油藏最终收敛效果存在较大差异、无关性较强，预测失准；(3) 利用带压渗吸时间标度归一化模型可建立岩芯尺度与油藏尺度焖井渗吸时间之间的关系。因此，基于不同控制机制的修正标度解析方程，建立适合致密储层不同介质渗吸时间标度归一化模型，对致密油藏提高采收率动态预测具有重要意义。

Methods of Time Scaling-up for Spontaneous Imbibition

In this paper, the progress of the time scaling-up methods for spontaneous imbibition (SI) processes in recent years is comprehensively reviewed. Based on the mechanism of SI, the modified and expanded models are analyzed. In addition, based on the core-scale theoretical and empirical models, the applicability and existing problems of these models in field-scale application are discussed. Representative dimensionless models and the corresponding boundary conditions are summarized. Firstly, the dominant contributing mechanisms of SI are capillary pressure and gravity, and the SI process is governed by both of these two mechanism for majority of tight reservoirs. Secondly, there exists wide gap between core-scale and field-scale studies for tight reservoirs, which thus makes the results irrelevant and mis-predicted. Therefore, to establish the time scaling-up models for SI with different media in tight reservoirs based on the modified scale analytical models with different mechanisms, are extremely important for predicting the dynamics of enhanced oil recovery in tight reservoirs.