压裂液伤害程度表示方法探讨  

Discussion on the index of fracturing fluid damage

作　　者：庄照锋[1,2] 张士诚[2] 李宗田[1] 刘长印[1] 林鑫[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《油气地质与采收率》2010年第5期108-110,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家高科技研究发展计划"863"项目"深层低渗透油气藏压裂改造关键技术"(2006AA06Z226)

摘　　要：利用SY/T 5107—2005中有关压裂液对地层伤害的定义与测试方法来评价对地层的伤害程度存在缺限。压裂液对地层的伤害源于滤失,滤液侵入深度和滤液侵入区渗透率降低程度共同决定了压裂液对地层的伤害程度。滤液侵入深度不同,其对地层的伤害率也不同,因此用伤害率不能准确表示压裂液对地层的伤害程度。通过渗流原理,推导了一个不受岩心长度影响的独立参数——附加厚度,该参数是具有长度的量纲,可全面反映压裂液对地层的伤害程度。附加厚度可通过室内实验测得,利用该值可方便地预测施工现场压裂液对地层的实际伤害程度及其对产能的影响。The index of fracturing fluid damage and its testing procedures cannot fully reveal the damaging process. The ratio of damage varies in response to the filtration profile, and the ratio itself cannot express the damage accurately. Fracturing fluid damage is caused by filtration, hence, damage index is related to the quantity of fluid loss and the ratio of damaged area. Based on Darcy law, a new index is derived and named as additional thickness,△L. △L may be expressed as; △L=L(k0/k-1),within which k is the initial and damaged permeability,L is damaged depth. AL includes the main factor of filtration damage,so it is more accurate for fracturing fluid damage expression. The value of AL can be calculated based on laboratory test,and may be used for performance prediction by reasonable conversion.

关 键 词：压裂液 伤害程度 附加厚度 动态滤失 产能 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]