The presence of fluid pressure gradient in the process flow in low permeability reservoir,how to determine the limit of low permeability reservoirs under the influence of pressure gradient injector spacing and production capacity,has become the main task of improving low permeability reservoir development effect.According to the existence of the power function relationship between the starting pressure gradient and the permeability,the relationship between the starting pressure gradient and the permeability is obtained by fitting the pressure gradient from the porous fluid percolation.According to equal output-source-sink seepage theory,the main line midpoint,the pressure gradient is also minimized,when the pressure gradient is equal to the point when the pressure gradient,the limit can be solved formulas injector spacing and different production pressure the difference between the limit injector spacing and permeability relationship chart,combined with the capacity formula of vertical wells to obtain a productivity formula limits injector Spacing BARS well as low permeability reservoir limits injector spacing and capacity study provides a theoretical basis.%流体在低渗透油藏的渗流过程中存在启动压力梯度,确定启动压力梯度影响下的低渗透油藏的极限注采井距与产能,成为了低渗透油藏提高开发效果的主要任务.从多孔介质渗流流变性测试实验可以实测得到启动压力梯度,依据启动压力梯度与渗透率之间存在幂函数关系,拟合得到了启动压力梯度与渗透率关系图版.根据等产量—源—汇渗流理论,主流线中点处渗流速度最小,压力梯度也最小,当该点的压力梯度等于启动压力梯度时,可求解出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关系图版,再结合直井的产能公式,得到极限注采井距下直并的产能公式,为低渗透油藏极限注采井距与产能研究提供了理论依据.
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