水平井分段压裂产能影响因素研究

Factors Affecting Productivity of Stage Fractured Horizontal Well

水平井压裂是开发特殊和难动用储量的重要技术手段,在油气田开发过程中得到了越来越广泛的应用。以矩形油藏中压裂水平井为研究对象,在水平井压裂不同裂缝形态的基础上,建立了油藏与裂缝的物理模型和数学模型,并对其进行了差分求解、编程。分析了裂缝长度、数量、间距和不均匀分布等因素对产能的影响,绘制了各个因素取最佳参数时的地层压力分布等高线图。结果表明,裂缝长度和裂缝数量对产能的影响最大,裂缝间距及分布情况对产能的影响相对要弱一些,可以增大裂缝间距以减小彼此之间的干扰作用。这对水平井进行压裂优化设计具有一定的指导作用。

Fracturing,an important measurement used to develop special or hard-to-recovery reserves,has been used widely in hydrocarbon exploitation.For the purpose of investigating fractured horizontal well in rectangular reservoir,the physical and mathematical model are built and solved numerically.The impact of fracture length,number of fracture,space distance and fracture distribution on productivity are analyzed.Formation pressure distribution contour maps are drawn when all parameters have optimized values.It shows that the length and number of fracture have the main effect on productivity;the space distance and distributions have less effect;and the space distance should be much larger in order to decrease their interference effect.The results provide guidance for optimization of fractured horizontal wells.