鄂尔多斯盆地大牛地气田致密砂岩气层应力敏感性综合研究  

COMPREHENSIVE RESEARCH OF TIGHT SANDSTONES GAS RESERVOIRS STRESS SENSITIVITY IN DANIUDI GAS FIELD

作　　者：康毅力[1] 张浩[1] 陈一健[1] 李前贵[1] 游利军[1] 程秋菊[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石化华北分公司,河南郑州450006

出　　处：《天然气地球科学》2006年第3期335-338,344,共5页Natural Gas Geoscience

基　　金：四川省青年科技基金项目(编号:02ZQ026-042);油气藏地质及开发工程国家重点实验室基金项目(编号:PLN9720)联合资助

摘　　要：致密砂岩气藏开发过程中有效应力增加所带来的渗透率应力敏感损害是导致气井产量快速递减的根本原因,故对应力敏感性损害机理研究能够为气层保护工作提供合理依据。在考虑岩石组分、裂缝、温度、含水饱和度和施压次数等因素的同时,对大牛地气田致密砂岩应力敏感性进行了评价,指出随岩屑含量增加和温度升高,致密砂岩应力敏感性增强,温度与有效应力联合作用使致密砂岩应力敏感性更强,水的存在对致密砂岩应力敏感性具强化作用;重复施压过程造成致密砂岩渗透率不断降低,裂缝岩样的渗透率应力敏感程度远大于基块;采用屏蔽暂堵储层保护工作液技术能够减轻致密砂岩气层的应力敏感性损害。During exploiting the tight sandstone gas reservoirs, the descent of pore pressure will induce the virtual stress increase, which makes the permeability drop, and it is basic reason of the gas reservoirs production descent. The study of stress sensitivity damage mechanism can provide a reasonable foundation for protection the tight gas reservoir. Taking Daniudi gas field tight sandstone as example, the factors of rock compositions, fracture, temperature, water saturation and repeatedly pressuring were considered for the evaluation of tight gas sandstone stress sensitivity. It shows that the higher fluorescence content and higher temperature lead a higher stress sensitivity. The association behavior of temperature and effective stress made a more strong stress sensitivity. Water can give a stimulation action for tight sandstone stress sensitivity. Repeatedly pressuring will make the permeability continuously drop. The tight sandstone stress sensitivity of fracture sample is stronger than matix. Temporary shielding protection reservoirs method can reduce the stress sensitivity damage of tight sandstone gas reservoirs.

关 键 词：大牛地气田 致密砂岩 气层 应力敏感性 储层保护 

分 类 号：TE122.2[石油与天然气工程—油气勘探]