八面河油田中低渗油藏重复压裂工艺研究

Study on the Refracturing Process of Middle-low Permeability Reservoir in Bamianhe Oilfield

八面河油田面14区沙四段属于中低渗稠油油藏,增产措施以压裂改造为主,但因生产过程中地层裂缝闭合及地层细粉砂运移嵌入,致使压裂增产逐渐失效。分析疏松砂岩重复压裂技术难点,针对性开展了基础分析、试验模拟,确定“高砂比、高加砂浓度、大排量”暂堵转向重复压裂思路,并对暂堵转向压裂施工参数及压裂液体系进行了优化,取得较好的改造效果。

Sha-4 Member of Mian 14 Area in Bamianhe Oilfield belongs to middle-low permeability heavy oil reservoir,and the stimulation measures are mainly fracturing.However,the fracturing stimulation gradually fails due to formation fracture closure and formation fine silt migration and embedding in the production process.The difficulties in the refracturing of loose sandstone are analyzed.Basic analysis and experimental simulation are carried out.The idea of temporary plugging steering re-fracturing with high sand ratio,high sand concentration and large displacement is determined.In addition,the parameters and fluid system of temporary blocking steering fracturing are optimized,and a better transformation effect is obtained.