摘要
低渗透弹塑性油藏具有明显的启动压力梯度和压力敏感效应,在油井生产过程中,储层压力分布规律与常规油藏存在着明显的不同。基于低渗透储层基本渗流规律,建立包含启动压力和压敏影响的渗流方程,并采用稳定逐次替换法求解,得到了综合考虑启动压力梯度和压力敏感影响下,储层渗透率和启动压力梯度的分布变化规律;并在此基础上,分析低渗透弹塑性油藏压力分布特征,进而确定出此类油藏储量极限动用半径。研究结果表明,对于低渗透弹塑性油藏,要综合考虑启动压力梯度和压力敏感的双重影响,确定油藏储量的极限动用范围,以指导此类油藏开发井网的部署。
Based on basic seepage law of low permeable reservoir,taken threshold pressure and pressure-sensitive effect into account,the flow equation of low-permeable elastoplastic reservoir was established. And then the equation was solved by stable successive substitution method. Finally it was obtained the distribution changing rule of reservoir permeability and threshold pressure gradient. Based on the pressure distribution feature,the limit producing radius was determined for this kind of reservoir reserve. The study results indicated that synthetically considering threshold pressure and pressure-sensitive effect,the limit producing radius is determined to be a better guidance for well network allocation of the low-permeable elastoplastic reservoir.
出处
《复杂油气藏》
2016年第3期61-64,共4页
Complex Hydrocarbon Reservoirs
基金
国家科技重大专项课题子课题<油气资产价值影响因素及评价指标集研究>(2016ZX05033005-007)
关键词
油田开发
低渗透油藏
启动压力梯度
压力敏感
压力分布特征
极限动用半径
oilfield development
low permeability reservoir
threshold pressure gradient
pressure sensitive
pressure distribution pattern
limit producing radius
