裂缝—孔隙型储层油水相渗实验研究  

Study on oil-water relative permeability experiments of fractured-porous reservoirs

作　　者：郭平[1] 张涛[1] 朱中谦[2] 杜建芬[1] 吴国才[1] 

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]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《油气藏评价与开发》2013年第3期19-22,共4页Petroleum Reservoir Evaluation and Development

基　　金：国家重大科技专项"特低渗透油层有效补充能量开发技术"(2008ZX05013-002)

摘　　要：油水相渗曲线是编制开发方案及动态预测的重要实验资料和依据,而裂缝—孔隙型碳酸盐岩储层取得有代表性的岩心较难,有代表性的相渗曲线无法测取。针对某裂缝—孔隙型碳酸盐岩储层,在取得无裂缝的地层实际岩心基础上,按照要求造缝得到5种渗透率大小不同的岩心,然后在一定束缚水饱和度条件下采用非稳态法对岩心进行了油水相渗曲线测试,并对测试结果进行分析,进一步加深对裂缝—孔隙型储层中油水渗流特征的认识。研究结果表明:随着岩心渗透率增大,等渗点饱和度、油水两相区范围及驱替效率逐渐增加。由归一化后油水相渗曲线可看出,水相相对渗透率呈一直线,表明水相主要裂缝以渗流为主,波及效率低。研究结果为裂缝—孔隙型储层油气田开发提供理论实验依据,为此类储层进一步研究提供了新的研究思路。Oil-water relative permeability curves are the important experimental data and the bases for the development plan and dynamic prediction, and it is difficult to obtain the representative core of fractured-porous carbonate reservoirs, so that representa- tive relative permeability curve cannot be measured. Taking some fractured-porous carbonate reservoir as an example, cores with- out cracks obtained helped to gain 5 cores with different permeability by fracturing. Then the oil-water relative permeability curves were tested by unsteady state method under the condition of certain irreducible water saturation. The test results were analyzed to deepen the understanding of oil-water percolation characteristics of fractured-porous reservoir. The results showed that the satura- tion at permeability isopleth point, oil-water two-phase region and displacement efficiency increased gradually with the increase of core permeability. That the water relative permeability curve is a straight line after normalization indicated that main fractures of water phase are mainly of the flows and the sweep efficiency is low. This study provides the theoretical and experimental bases for the development of fractured-porous reservoirs and new research methods for the further study of such reservoirs.

关 键 词：相对渗透率曲线 裂缝-孔隙型 非稳态法 渗流特征 

分 类 号：TE312[石油与天然气工程—油气田开发工程]