中低渗储层物性特征对水驱油效率的定量影响

Quantitative effect of physical characteristics of medium and low permeability reservoirs on water flooding efficiency

张阳 芦凤明 李际 郭志桥 聂敢为 衡亮

中国石油大港油田分公司，天津 300280 中国石油大学（北京）克拉玛依校区石油学院，新疆 克拉玛依 834000 中国石油新疆油田分公司实验检测研究院，新疆 克拉玛依 834000 中国石油大学（北京）地球科学学院，北京 102249

Dagang Oilfield Company, PetroChina, Tianjin 300280, China College of Petroleum, China University of Petroleum (Beijing) at Karamay, Karamay 834000, China Experiment Testing Institute, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China College of Geosciences, China University of Petroleum, Beijing 102249, China

为了探讨中低渗储层物性特征对水驱油效率的定量影响，文中以沧东凹陷孔一段冲积扇沉积的2口密闭取心井为研究对象，通过水驱油实验、压汞实验以及实验结果的定量分析，得到了16组平行样的储层物性参数及其对应的驱油效率，计算了储层物性参数对驱油效率影响的权重系数，并对结果进行验证。研究表明：渗透率、储层结构指数、平均孔隙半径、均质系数、饱和度中值压力、退汞效率与驱油效率相关性最好，可以作为评价参数；对于冲积扇中低渗储层，储层品质指数对驱油效率影响的权重系数最大，其次为平均孔隙半径和退汞效率。建立的无量纲驱油效率公式的计算结果与水驱油实验的驱油效率相关性较好，验证了所选储层物性参数及其对驱油效率影响权重系数的准确性。

In order to discuss the quantitative effect of reservoir physical characteristics on the efficiency of water flooding in the medium and low permeability reservoirs, the two sealed coring well rock samples deposited by alluvial fan in the first Member of Kongdian Formation in Cangdong Sag were studied. Through the experiments of water flooding and mercury intrusion with the various quantitative analysis of experimental results, the physical parameters of 16 sets of parallel samples and their corresponding oil displacement efficiency were obtained, the weight coefficient of the influence of reservoir physical parameters on oil displacement efficiency was calculated, and the result was verified. The results show that the permeability, reservoir structure index, mean pore radius, homogenization coefficient, median pressure of saturation and the mercury withdraw efficiency have the best correlation with the oil displacement efficiency and can be used as evaluation parameters. For the medium and low permeability reservoirs of the alluvial fan in this study, the weight coefficient of the reservoir quality index on the impact of oil displacement efficiency is the largest, followed by the average pore radius and the efficiency of mercury withdrawal. The formula of dimensionless oil displacement efficiency was established, and the calculated results are in good correlation with the oil displacement efficiency of the water flooding experiment. The accuracy of the selected reservoir physical parameters and the weight coefficient affecting the oil displacement efficiency was verified.

10.6056/dkyqt202101017