变渗透率模量与双重孔隙介质的压力敏感性.PDFVIP

2010 年第34 卷 Vo l. 34 No.3 中国石油大学学报(自然科学版) 第 3 期 Journal of China University of Petroleum Jun.20 1O 文章编号: 1673-5005 (2010) 03 -0080 -04 变渗透率模量与双重孔隙介质的压力敏感性 王建忠姚军张凯郝振江2 (1.中国石油大学石油工程学院，山东青岛 266555; 2. 长庆油田第三采油厂，宁夏银川 750000) 摘要:对于压敏双重介质，裂缝的渗透率模量随有效应力变化而变化，把渗透率模量视为常数会给渗透率的计算带 来较大误差。通过数学分析和试验探讨渗透率模量随有效应力的变化规律，并建立考虑变渗透率模量的双重孔隙 压敏介质油藏试井解释模型。结果表明:存在大量裂缝的双重孔隙介质的渗透率具有明显的压力敏感特性，随有效 应力的增加渗透率模量逐渐变小;具有强压力敏感性的介质，其渗透率模量和模变系数较大。 关键词:双重孔隙介质;变渗透率模量;有效应力;压力敏感性 中图分类号:TE 125.3 文献标志码:A doi: 10. 3969/j. issn. 1673-5005.2010.03.017 Variable permeability modulus and pressure sensitivity 。f dual-porosity medium 1 l 2 WANG Jian-zhong , YAO Jun , ZHANG Kail , HAO Zhen-jiang (1. College of Petroleum Engineering in Chinα University of Petroleum , Qingdao 266555 , China; 2. 3rd Oil Production Plant of Changqing Oi 1field , Yinchuan 750000 , China) Abstract: The permeability modulus of fracture changes with the effective stress in pressure-sensitive dual-porosity medium. Taking permeability modulus as a constant will lead to large erroT. The laws of permeability modulus variation with effective stress were investigated by mathematical analysis and experimental study , and a mathematical model of well testing interpreta- tion was developed for pressure-sensitive dual-porosity reservoi r. The results show that the permeability of dual-porosity medi- um with many fractures is sensitive to pressure. And the permeability modulus decreases gradually with the effective stress in- creasing. Th