摘要
应力敏感对储层的损害具有不可逆性,启动压力梯度导致油藏中出现不流动区;因此,界定海上低渗透油藏非线性渗流的渗透率下限对制定高效开发技术政策至关重要。分别选取珠江口盆地东部10块和17块典型低渗透岩芯开展应力敏感实验和启动压力梯度实验研究。通过实验结果分析,分别建立了应力敏感、启动压力梯度与油藏岩石渗透率的关系模型,定量表征了海上低渗透油藏非线性渗流特征。选用油藏实际参数,模拟计算应力敏感和启动压力梯度对产能的影响,界定了珠江口盆地东部低渗透油藏应力敏感渗透率下限为10×10-3μm2,启动压力梯度下限38×10-3μm2,以此指导南海东部低渗透油藏合理开发技术政策制定,从而为提高油田开发效果奠定了基础。
The loss of stress sensitivity is irreversible,at the same time starting pressure gradient leads into the static fluid in the reservoir. So it is very important to get the lower limit standard of permeability of nonlinear flow in the offshore low permeability reservoir. It chooses eastern Pearl River Estuary basin 10 piece low permeability cores to conduct experimental research on stress sensitivity and 17 pieces cores to conduct starting pressure gradient of low permeability reservoir offshore. On the basis of analysis of experimental result,it builds the relationship between stress sensitivity,starting pressure gradient and rock permeability and characterize offshore reservoir nonlinear flow.On the basis of this,practical reservoir data calculate the product well production under stress sensitivity and starting pressure gradient was used. The low standard of stress sensitivity is 10 × 10^- 3μm2and the low standard of starting pressure gradient is 38 × 10^- 3μm2. It conducts the development strategy formulation and laid the foundation for promoting reservoir development in the low permeability reservoir of eastern Pearl River Estuary basin.
出处
《科学技术与工程》
北大核心
2015年第24期152-156,共5页
Science Technology and Engineering
关键词
应力敏感
启动压力梯度
低渗透
模型
有效应力
stress sensitivity starting pressure gradient low permeability model effective stress
