宝中低孔低渗气顶油藏油环带先导试验区开发效果分析

An Analysis of Development Effects of Pilot in Oil Rim Zone in Gas Cap Reservoir with Low Permeability and Low Porosity in Baozhong Oilfield

宝浪油田宝中区块为长条型背斜构造气顶油藏,其背斜高部为凝析气,中部发育油环,油环面积5.9km2,储量约535×104t。为了搞好油环带的开发,在构造中部油环带上部署了三个先导试验井组进行开发试验。结果表明:油水井在不进行措施改造的情况下,日产油、日注水分别只有6.5t和9m3,酸化后,油井平均日增油可达3.0t,水井日注量可提高两倍以上,采油速度达1.24％。在注采井距为250m的情况下,油井见效时间为6个月。

Baozhong block in Baolang oilfield with reserves of 5.35m tons is an anticline gas cap reservoir where con-densate gas accumulated in the structural high of the anticline and an oil rim with an area of 5.9km2 developed in the middle. Three pilot test well groups were allocated in the oil rim zone in the center of the structure. Pilot test results showed that daily oil output and water injection were 6.5 tons and 9m3 respectively before stimulation, while incremental daily oil output was 3.0 tons and daily water injection tripled and oil recovery rate was up to 1.24% after acidization. Reponse time of oil wells was 6 monthes when production-injection well spacing was 250m.