松滋油田厚层底水低渗透油藏开发物理模型实验研究

Physical Modeling Development Experimental Study of Bottom Water Reservoir with Low Permeability in Songzi Oilfield

在松滋油田红花套组油藏底水油藏的开发过程中,其底水的锥进形态及上升速度对油井的生产动态有着很重要的影响。开展低渗透底水油藏物理模拟开发实验,研究厚层底水低渗透油藏在不同井型、不同避水高度、不同底水能量及不同隔层位置条件下的底水上升规律。结果表明,随着避水高度增加,后期原油采出程度的增幅减缓,且有下降趋势;增加底水能量虽加速了底水的上升,无水采油期短,但原油最终采出程度高;隔夹层离射孔段越近,对底水的阻隔作用越好。

In the development of bottom water reservoir of Honghuatao Formation in Songzi Oilfield,its bottomwater coning type and ascending velocity has an important impact on production performance of oil wells.This paper conducts physical modeling development Experiment of bottom water reservoir with low permeability to study bottom water ascending rule of thick-layer bottom water reservoir with low permeability under the conditions of different well types,different height of water avoidance,different bottom water energy and different interlayer position.The result shows that the growing rate of later crude oil recovery slows down with height increase of water avoidance,that increasing bottom water energy contributes to increasing final recovery percentage of crude oil although it accelerates bottom water rising and shortens water-free oil production period and that the closer the interlayer is to the perforation interval,the better role it plays in cutting off bottom water.