平板模型水驱油物理模拟相似理论研究

Physical Simulation of Water Flooding in Plate Model Similar Theory Study

为了给出明确的实验室物理模拟的可行性办法,采用一种与前人不同的推导方法——改进的检验分析法,对特低渗透油藏水驱油物理模拟相似准则进行了推导,给出了在目前实验室条件下,以再现油田生产过程,预测剩余油分布为目的的平板模型。室内物理模拟实验能够最大程度上实现的模拟方案。模拟方案通过选取与实际油藏储层对应的露头岩心,可以实现模型与原型中两相渗流特征、毛管力特征和非线性渗流特征的相似,使得物理模拟实验能够最大程度上反映油藏中的流体渗流规律。对于压裂裂缝无法满足几何相似的情况,提出了一种等效模拟的物理模拟实现办法。按照推导得到的相似准则确定了模型参数与油藏参数进行转换的关系,所得结论为特低渗透油藏水驱油物理模拟提供了理论指导。

In order to give clear feasibility measures in laboratory physical simulation, a different method with the previous derivation-improved inspectional analysis is used, deduced the similarity criterion of water flooding in the ultra-low permeability reservoir and provide a simulation scheme which could simulate the real reservoir to the greatest extent in current laboratory conditions for the purpose of recreating oil field production process, predict the remaining oil saturation distribution. Through the selection of the corresponding outcrop rock with the actual reser- voir the simulation scheme can realize the similarity of two phase flow characteristics, capillary force characteristics and nonlinear seepage characteristics in between the model and the reservoir prototype, which could make physical simulation experiment reflect the reservoir fluid seepage characteristics to the greatest extent. For the condition of hydraulic fracture cannot satisfy the geometric similar rule, an equivalent method is presented for the physical simu- lation to realize it. According to the similarity criterions derived the conversion relationships of the model parameters and reservoir parameters are determined. The conclusions could be the theoretical guidance for the physical simulation of water flooding in the ultra-low permeability reservoirs.