摘要
目前水平井多段压裂的应用越来越多,但是现有的压裂压力递减分析方法都是针对单条水力裂缝的。由于水平井多段裂缝闭合时,流体流动特征与直井单条裂缝具有明显不同,针对直井单条裂缝的压裂压力递减分析方法不适用于水平井多段压裂。考虑水平井多段裂缝闭合时的压力变化特点,对多段裂缝强制闭合与裂缝自然闭合进行了分析,建立了多段裂缝同时闭合的压力递减模型和裂缝参数解释方法,编制了水平井多段压裂后压力递减分析解释软件,并进行了实例分析。模拟结果表明,压力递减分析方法可以解释出水平井多段压裂的重要裂缝及储层参数,实例应用结果表明,由所建模型模拟出来的裂缝参数解释结果可靠,对水平井水力压裂理论的发展以及指导现场施工都有重要的意义和参考价值。
At present, the application of horizontal well multiple-stage fracturing becomes more and more popular. However, the existing model of pressure decline analysis aims primarily at single fracture. There are great differences in the flow performance of fluids between multiple-stage fractures and single fracture during the fracturing closure process. The model of pressure decline analysis aiming at single fracture does not apply to the horizontal well multiple-stage fractures. Taking into account of the pressure change with the situation about the horizontal well multiple-stage fractures closure, this paper analyzes forced and natural closure of horizontal well after multiple-stage fracturing, and then establishes curve fitting method of related pressure decline model and fracturing parameters interpretation based on the pressure drop features while multiple-stage fractures are closing simultaneously, than we compiled the software about pressure decline analysis of horizontal well multiple-stage fracturing, and it has been used for the case analysis. The results show that this analytical method can explain some important parameters of fracture and reservoir, and the result is reliable, also it is of great significance and reference value to the development of horizontal well fracturing theory and fracturing operation.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第4期66-70,115-116,共5页
Petroleum Geology and Recovery Efficiency
基金
新世纪优秀人才支持计划"页岩气藏压裂渗流理论与应用技术研究"(NCET-11-1062)
关键词
水平井多段压裂
多缝闭合
压力递减模型
裂缝参数
解释方法
multistage fracturing horizontal well
multi-fracture closure
pressure decline model
fracture parameter
interpretation method
