一种改进的合理井控储量与采收率确定方法

合理井控储量是油田开发设计的核心内容,其大小直接影响采收率的高低。以中石油勘探开发研究院经验公式为基础,通过对公式系数的修正,建立了新的采收率和井控储量关系式;同时为增加公式的适用性,提出了以水平井与直井间的产能比来表征替换比确定井控储量的方法。最后利用南海西部8个水驱砂岩油藏标定采收率和井控储量对改进公式进行了检验。结果表明:利用驱油效率代替原公式系数后的新公式实用性更好,能够更好地反应采收率随井控储量的变化;利用水平井与直井间产能比来表征替换比的方法在南海西部油田应用效果较好。

An improved method for determining reasonable well controlled reserves and recovery factor

The research of reasonable well controlled reserves is the keystone of oilfield development design, which will have an extraordinary impact on recovery factor. In this paper, the empirical formula of Exploration and Development Research Institute of PetroChina was modified and improved, and then one new recovery factor and well controlled reserves empirical formula was presented. At the same time, to increase the applicability of the formula, put forward the method of determine the well control reserves using the productivity ratio for horizontal and vertical well to characterize substituted ratio. Finally, field application of this new formula was demonstrated by using the calibrated recovery factor and well controlled reserves of 8 water-drive sandstone reservoirs at western South China Sea. The results showed that: The new formula has a better practicability by using oil displacement efficiency to repalce the original formula of coefficient; the method of using the productivity ratio for horizontal and vertical well to characterize substituted ratio has a better application at the reservoirs of western South China Sea.