火烧油层前缘稳定性准则研究

As in many other Enhanced Oil Recovery processes, Fire Flooding also faces the problem of how to predict the stability of the Fire Flooding front and how to prevent the fingering phenomenon. An effective way of deciding the Fire Flooding front stability is always lacked in the internal reservoir engineering community. This project aims to establish such criteria, and to use numerical reservoir simulation and physical experiments to prove such criteria. First, by analyzing the different factors affecting the Fire Flooding front movements, we would build the mathematical model for front stability. We analyze the material and energy balance around the interface of the front, and establish the front stability criteria based on such analysis. Furthermore, we utilize high precision numerical simulations to simulate the fingering phenomenon in Fire Flooding. This would examine the consistency between the unstable displacements in the simulation and the predictions made by the stability criteria. Finally, we conduct a set of large scale 3D Fire Flooding physical experiments to examine the stable and unstable displacement phenomenon in such experiments, thus proving the reliability of such stability criteria. This front stability criteria would provide the reservoir engineers with a set of tools to use in the field to predict the front stability, thus guiding the design of Fire Flooding processes in practice, and eventually achieving the goal of better economic outcome.

类似于其他提高采收率过程，火烧油层也存在着如何预测前缘稳定性及防止指进现象的问题。国际油藏工程界长期缺乏有效的火烧油层前缘稳定性判定准则。本项目旨在建立该准则，并利用数值模拟和物理实验对该准则进行验证。首先，通过分析影响火烧前缘运动的多种因素，我们建立前缘稳定性的数学模型，分析前缘界面的质量和能量守恒规律，并在此基础之上提出稳定性判定准则。进而，高精度油藏数值模拟将被用来模拟指进现象的产生，并检验模拟中的非稳定驱替是否与稳定性准则的预测一致。最后，我们搭建并实施一组大型三维火烧物理实验并观察其中的稳定及非稳定驱替现象，以验证所提出的稳定性准则的可靠性。该准则将为油藏工程师提供一套在现场预测火烧前缘稳定性的工具，以此来指导火烧油层过程的设计，最终达到提高经济效益的目的。

类似于其他提高采收率过程，火烧油层也存在着如何预测前缘稳定性及防止指进现象的问题。本项目建立了火烧油层前缘稳定性判定准则，并利用数值模拟和物理实验对该准则进行了验证。首先，通过分析影响火烧前缘运动的多种因素，建立了前缘稳定性的数学模型，分析了前缘界面的质量和能量守恒规律，并在此基础之上提出了稳定性判定准则。进而，利用高精度油藏数值模拟来模拟指进现象的产生，并检验模拟中的非稳定驱替是否与稳定性准则的预测一致。最后，搭建并实施了大型三维火烧物理实验并观察其中的稳定或非稳定驱替现象，以验证所提出的稳定性准则的可靠性。该准则为油藏工程师提供了一套在现场预测火烧前缘稳定性的工具，以此来指导火烧油层过程的设计，最终可达到提高经济效益的目的。