低渗透纵向非均质油层水驱波及规律实验研究  

Experimental study on rule of waterflooding sweep in low permeability vertical heterogeneous formations

作　　者：沈瑞[1] 赵芳[1,2] 高树生[1] 胡志明[1] 段宝江 

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [2]中国科学院研究生院,北京100190 [3]中海油能源发展有限公司采油技术服务分公司,天津300452

出　　处：《油气地质与采收率》2013年第4期91-93,117,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"低渗;特低渗油藏开发技术界限研究"(2008ZX05013-003)

摘　　要：多层非均质油藏普遍存在层间矛盾,导致低渗透层动用程度、水驱波及程度及采收率低,纵向非均质性严重影响了低渗透油藏的高效开发。通过单岩心水驱油、岩心组合模型水驱油实验,结合多层非均质油层注水量劈分公式和水驱波及系数计算方法,研究了渗透率级差对水驱波及规律的影响。结果表明:岩心组合模型的吸水量分配符合多层非均质油藏吸水量劈分理论公式,岩心组合模型可以较为准确地反映非均质油藏的水驱波及规律;随着岩心组合模型渗透率级差的增大,高渗透层的吸水量比例逐渐增加,当渗透率级差大于9时,注入水几乎无法波及低渗透层。Multi-layer heterogeneous reservoir is commonly of interlayer interference,and therefore leading to low producing degree, low sweep efficiency and low recovery of waterflooding.The vertical heterogeneity seriously affects efficient development of low permeability reservoirs.The waterflooding experiment of single core and core combined model are carried out in this paper.The average permeability to water of core combined model is similar,so the influence of permeability ratio to the law of the waterflooding sweep is studied as well.The results show that the measured water absorption of core combined model corresponds to the theoretical formula of multi-layer heterogeneous reservoir.The displacement experiment of core combined model can accurately reflect the rule of the waterflooding sweep.As the permeability ratio is larger,the percentage of water absorption in high permeability gradually increases.When the permeability ratio is larger than 9,the injected water can hardly sweep the low permeability layer.

关 键 词：非均质性 水驱 波及系数 低渗透 岩心组合模型 

分 类 号：TE34[石油与天然气工程—油气田开发工程]