利用启动压力梯度计算低渗油藏极限注采井距

从低渗储层单相渗流机理室内研究可以得到实测启动压力梯度;依据启动压力梯度的非线性渗流方程,并通过实验数据的统计拟合得到了低渗透储层启动压力梯度与流度的幂函数关系式。结合低渗透油藏渗流理论和低渗透油田实际,得到了低渗透油藏确定极限注采井距的公式和不同生产压差下极限注采井距与渗透率的理论图版,可为低渗透油田开发确定合理井网密度提供理论依据。

Calculating the limit injector- producer distance in low permeability pool by with start - up pressure gradient

The start-up pressure gradient can be obtained from the experiment of single-phase fluid in the low permeability reservoir.On the basis of the nonlinear flow function of start -up pressure gradient,the power function between the start -up pressure gradient and the mobility in the low permeability reservoir are deduced from the statistics and fitting of experimental data.By combining the filtration theory with the field application in the low-permeability oilfield,acquired are the expression of the limit projector-producer distance in low permeability reservoirs and the theoretical plates between the limit projector-producer distance and the permeability in different production pressure differential, which offer the theoretical basis to the well distance density.