低渗透油藏水平井流入动态及影响因素

对低渗透油藏渗流规律不符合达西定律，普遍存在启动压力的特点，建立了低渗透油藏水平井油气两相渗流的数学模型，为水平井流入动态关系（IPR）曲线在低渗透油藏的应用提供了理论依据；分析了启动压力梯度、边界压力、边界半径、直线段斜率和截距等因素对水平井IPR曲线的影响程度。研究表明：对于低渗透油藏，相同井底流压时，启动压力梯度越小，水平井产量越大；边界压力越大，水平井产量越大；边界半径越小，水平井产量越大；直线段斜率越大，水平井产量越大；直线段截距越大，水平井产量越大。

INFLOW PERFORMANCE AND AFFECTING FACTOR OF HORIZONTAL WELLS IN LOW PERMEABILITY RESERVOIR

Based on non-Darcy flow and existing threshold pressure in low permeability，a theoretical model of horizontal well oil-gas flow through porous media is developed，which supports application of horizontal well IPR analytical technique in low permeability reservoirs.The affecting factors of horizontal well IPR，such as threshold pressure gradient，boundary pressure，boundary radius，straight slope of，straight intercept of are analyzed.The results show that when the smaller the threshold pressure gradient is，the higher the horizontal well production is，and when the bigger boundary pressure is，the higher the horizontal well production is，and when the smaller boundary radius is，the higher the horizontal well production is，and when the bigger straight slope of is，the higher the horizontal well production is，and when the bigger straight intercept of is，the higher the horizontal well production is in the same bottom hole flowing pressure in low permeability reservoirs.