基于剩余油分布的分层调配注水井注入量的方法

A method to allocate injection volume for separate layers in a water-injection well based on the remaining oil distribution

从生命旋回理论和Logistic增长规律出发,推导了水驱油田可采储量采出程度与累计注入孔隙体积倍数之间的定量关系;按照小层剩余可采储量分布规律,提出了基于剩余油分布的分层调配注水井小层配注量计算方法,该方法适用于中、高含水初期的稳定水驱油田。渤海油田先导试验表明,该方法具有较好的降水增油效果;与以往按照厚度进行配注相比,该方法可以有针对性地增加剩余油富集小层的注水量,扩大注水波及系数,对于海上大段防砂、处于中高含水初期的油田具有很好的推广应用价值。

A quantitative relationship between the recovery percent of recoverable reserves and thecumulative injected times of pore volume was de- rived for water-drive oilfields based on Lifeeycle Theory and Logistic Growth Law. According to the distribution of remaining recoverable oil in va- rious layers, a method to allocate injection volume for separate layers in water-injection wells was devel- oped, which is suitable for the heterogeneous oil- fields that are stabilized in water drive and in the pre- liminary stage of middle or high water eut. Its pilot application in Bohai oilfields has shown that its injee- tion allocation is better in decreasing water and in-creasing oil. Compared with the conventional injec- tion allocation on layer thickness, this injection allo- cation can intentionally increase injection volume for layers with more remaining oil, and improve the sweep efficiency of water flooding. Therefore, this method is very valuable for the offshore oilfields con- taining long sand-control sections and in the prelimi- nary stage of middle-high water cut.