低渗透油藏压前不稳定试井数据与压裂效果的关系分析  

Relationship between unstable well test data before fracturing and fracturing effect in low permeability reservoir

作　　者：李超 LI Chao(Well Testing Technology Service Branch of PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163000,China)

机构地区：[1]中国石油大庆油田有限责任公司测试技术服务分公司,黑龙江大庆163000

出　　处：《油气井测试》2023年第1期74-78,共5页Well Testing

摘　　要：为进一步优化低渗透油藏不稳定试井压裂设计方案,增强压裂措施可行性,充分了解试井解释结果与压裂措施效果之间的关系,从统计学角度出发,分析X油田典型的低渗透油藏B区402口井压裂前不稳定试井数据解释结果,得出有效渗透率、表皮系数、末点压力等参数与不同压裂方式累积增油之间的关系。分析认为,单井累计增油量提高概率最大的情况分别为:平均地层压力增加且有效渗透率降低;有效渗透率增大且弹性储能系数降低;关井压力增大且表皮系数下降。该分析为有效制定压裂设计、采取合理压裂措施取得良好的增产效果提供数据支撑。In order to further optimize the unstable well test fracturing design scheme of low permeability reservoir,enhance the feasibility of fracturing measures and improve economic benefits,it is necessary to fully understand the relationship between well test interpretation results and fracturing measures by analyzing the correlation between effective parameters of interpretation results before fracturing and cumulative oil increase after fracturing,so as to provide objective and fair interpretation data support.From the perspective of statistics,this paper analyzes the interpretation results of unstable well test data of 402 wells in Block B,a typical low-permeability reservoir in X oilfield,and summarizes the relationship between effective permeability,skin coefficient,end point pressure and cumulative oil increase of different fracturing methods.It is considered that the maximum probability of increasing cumulative oil increase of a single well is as follows:the average formation pressure increases and the effective permeability decreases;The effective permeability increases and the elastic energy storage coefficient decreases;The shut in pressure increases and the skin factor decreases.

关 键 词：低渗透油藏 不稳定试井 相关性分析 平均地层压力 有效渗透率 弹性储能系数 关井压力 累积增油 

分 类 号：TE357[石油与天然气工程—油气田开发工程]