摘要
压力敏感性对低渗透砂岩气藏的损害程度主要由储集层岩石本身的特性决定。储集层岩石颗粒和胶结物的成分、含量、分布,以及储集层的孔隙结构和喉道特征等因素都是影响和决定储集层压敏损害大小的内在因素。利用天然岩心进行压力敏感性实验,实验结果表明,裂缝比孔隙的应力敏感程度要强得多,应力卸载后裂缝的渗透率恢复率不超过27.8%,孔隙性岩样的渗透率恢复率可达到原先的94.8%。最后分析了压力敏感性伤害的原因及其对注采过程的影响。
One of the main damage factors in low-permeability sandstone reservoir is stress sensitivity. The damage degree is dependent on the rock＇s features. The composition, content and distribution of rock grains and cements, pore structure and throat features are all inner factors that affect and determine the size of stress sensitivity. During the research of stress sensitivity damage, the natural cores are used for the experimental analysis. Results indicate that fracture-type cores are more sensitive to stress than porous cores. After the stress is unloaded, the permeability of fracture-type cores returns by 27.8% and the permeability of porous cores maximally returns by 94.8%. This paper also analyzes the reason of stress sensitivity and its influence on the procedure of injection and production.
出处
《断块油气田》
CAS
2008年第2期47-48,共2页
Fault-Block Oil & Gas Field
基金
国家西部开发科技行动计划重大攻关项目“陕甘宁盆地特低渗油田高效开发与水资源可持续发展关键技术研究”(2005BA901A13)
关键词
砂岩油藏
压力敏感
原因分析
影响
sandstone reservoir, stress sensitivity, cause analysis, influence factors.
