Analysis of Factors Influencing the Production Profile Equilibrium for Perforated Horizontal Wells
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摘要: 水平井产液剖面的均衡性间接反映了储层动用程度的均衡性,是射孔参数优化设计的重要依据。将源函数方法与表皮系数模型相结合,基于势的叠加原理,建立了各向异性油藏射孔水平井的油藏-井筒耦合模型,该模型可考虑地层损害和射孔等因素对水平井流入动态的影响,并给出了产液剖面和势分布剖面的求解方法。采用该模型分析得到了井斜角、油层厚度、地层原油黏度和垂向渗透率对射孔水平井产液剖面均衡性的影响规律。受井筒各处流态、泄油面积差异以及井筒内压力损失影响,射孔水平井的流量分布呈现端部效应和跟趾端差异,产液剖面呈斜"U"形;端部效应随着井斜角减小和垂向渗透率降低而减弱,随着油层厚度减小和原油黏度降低而增强;跟趾端的流量差异随着井斜角减小及油层厚度和垂向渗透率降低而减小,随着原油黏度的降低而增大。Abstract: The equilibrium of production profile,which reflects the equilibrium of producing degree,is an important basis for perforation optimization.Combining source function with skin-factor model,a reservoir-wellbore coupled model of perforated horizontal wells in anisotropic reservoirs is established based on the principle of potential superposition.The model takes the influence of formation damage and perforation on flowing performance of horizontal wells into account.The solution procedures for production profile and potential distribution profile are also presented.In this paper,the influence of well inclination,formation thickness,oil viscosity and vertical permeability on the equilibrium of production profile for perforated horizontal wells are investigated.Affected by flow regime,drainage area difference and wellbore pressure drop,the inflow profile of perforated horizontal wells shows end effect and difference between heel and toe,and producing profile shows skewed U shape.The end effects decrease with the decrease of well inclination and vertical permeability,but increase with the decrease of reservoir thickness and oil viscosity.The flow difference between heel and toe decreases with the decrease of well inclination,reservoir thickness and vertical permeability,but increases with the decrease of oil viscosity.
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