水驱油局部相似模型的设计及定量评价方法

DESIGN OF PARTIAL SIMILARITY MODELS AND THEIR EVALUATION METHOD IN WATER FLOODING PHYSICAL SIMULATION

采用相似准数敏感性分析方法,对各局部相似模型中所放松相似准数的敏感性进行分析,得到应尽量减少放松的相似准数.提出了定量评价局部相似模型优劣的影响系数,通过比较该影响系数的大小即可定量评价各局部相似模型.结果表明:水驱局部相似模型的精度不仅取决于所满足的相似准数的个数,还与相似准数的相对放松量有关.

To quantitatively evaluate the partial similarity models of water flooding, a new numerical approach of sensitivity analysis is proposed for the sensitivity of the relaxed dimensionless parameter： The sensitivity factor quantifying the dominance degree of the relaxed dimensionless parameter is defined. By solving the dimensionless governing equations including all dimensionless parameters, the sensitivity factor of each relaxed dimensionless parameter is calculated for each partial similarity model, thus the dominance degree of the relaxed one is quantitatively determined. Based on the sensitivity analysis, the influence coefficient of the partial similarity model is defined as a criterion to evaluate each partial similarity model. The partial similarity model with the smallest influence coefficient can be singled out. Results show that the precision of the partial similarity model is not only determined by the number of dimensionless parameters but also by the relative relaxation quantity.