摘要
随着越来越多的复杂油气藏投入到勘探开发中,储层纵向渗透率非均质性已成为影响或制约酸压改造效果的重要因素。以储层渗透率与岩石溶蚀速率关系为基础,结合数值模拟方法及9口气井改造效果实例,综合分析了储层纵向渗透率非均质性对酸压改造效果的影响规律。结果表明,纵向渗透率分布对酸蚀沟槽的形成及导流能力有重要影响,储层纵向渗透率变异系数在0.8～1之间时,酸压改造模拟效果较好。实践证明当储层渗透率非均质性较强或较弱时,酸压改造效果较差;当储层纵向渗透率非均质性为中等程度时,酸压改造效果较好。
With the exploration and development of more and more complex reservoirs,the vertical permeability of reservoir heterogeneity has become an important factor to influence or restrict the effect of acid fracturing.Based on the relationship of permeability and rock dissolution rate,and combined with numerical simulation methods and transformation effect instances in 9 gas wells,the influence law of vertical permeability of reservoir heterogeneity on the effect of acid fracturing was analyzed synthetically.The results showed that the vertical permeability distribution has a major impact on the formation and conductivity of etching groove.When the variation coefficient of vertical permeability was at 0.8-1,the simulation effect of acid fracturing was better.Practice has proved that the effect of acid fracturing with moderate heterogeneity reservoir was better than strong or weak heterogeneity reservoir.
出处
《钻采工艺》
CAS
北大核心
2012年第6期24-26,8,共3页
Drilling & Production Technology
基金
四川省教育厅自然科学项目"碳酸盐岩储层交联酸酸压技术研究"(编号:07ZA172)资助
关键词
酸压改造
渗透率
溶蚀速率
非均质性
变异系数
acid fracturing,permeability,rock dissolution rate,heterogeneity,variation coefficient
