摘要
流体在多孔介质内流动时,均不同程度地存在启动压力梯度。对于高渗透性稀油油藏,启动压力梯度对油田开发过程的影响可以忽略;但对于低渗透油藏,启动压力梯度显示出重要的影响,呈现非线性渗流特征[1]。文中利用具体油藏的实验数据,计算了最小启动压力梯度和最大(临界)启动压力梯度,回归出启动压力梯度与渗透率的幂函数关系式。通过回归的关系式研究了其在油田开发中的应用,并通过流态图版判断井网适应性,确定合理注采井距,提出了低渗油藏改善开发效果具针对性的措施。
Flowing in multi-porous media, the fluid always has a starting pressure gradient. In high-permeability and thin oil reservoirs, an effect of starting pressure gradient on their development can be ignored whereas the gradient is very important and shows a nonlinear percolation in low-permeability reservoirs. Using the actual experimental data, we calculated the minimum and maximum starting pressure gradients, and obtained a relational expression of power function between starting pressure gradient and permeability. This paper applies this expression to oilfield development, and estimates the well-pattern adaptability through the flow-pattern plate in order to determine the reasonable injection-production well spacing. Also, suggestions on effective development of low-permeability reservoirs have been proposed.
出处
《天然气勘探与开发》
2008年第2期28-31,共4页
Natural Gas Exploration and Development
关键词
低渗透油藏
启动压力梯度
非达西渗流
幂函数关系式
油藏开发
low-permeability oil reservoir, starting pressure gradient, non-Darcy percolation, relational expression of power function, reservoir development
