| Summary: | Under the requirement of well pattern estimation for low-permeability reservoirs, horizontal wells and fracturing wells, this paper presents a new method for 5-spot well pattern productivity estimation by introducing shape factor of the drainage area, equivalence radius of fracture/horizontal well and threshold pressure gradient. By applying mirror image and principle of pressure superposition, steady-state flow for an infinite well net can be transformed into pseudo steady-state flow for a producer or an injector in a closed drainage area. This new productivity estimation method for 5-spot well pattern can be unified with a general formula considering the type of well pattern, type of injection-production, type of well completion and type of reservoir. Application in the Yushulin Oilfield showed that the new method presented in this paper is easy to derive, to calculate and to extend. It can be used to estimate the productivity rapidly in oilfields. 摘要: ： 针对低渗透油藏、压裂井、水平井等对井网评价的要求，从直井五点注采井网产能分析入手，采用镜像反演法、压力叠加法，并引入形状因子、裂缝和水平井当量井径、启动压力梯度等参数，将无穷井排的稳定渗流问题转化成为封闭体中一口注水井或者采油井的拟稳态渗流问题，通过求取封闭边界中油井、注水井的拟稳态压力方程得到注采压差和产量的关系式，建立不同注采井网、不同注采井型、不同投产方式、不同油藏类型的产能计算通式，形成了一套井网产能评价新方法。该方法在大庆榆树林油田井网调整优选中的应用表明，其具有公式简单、计算方便、扩展性好的优点，适用于油田现场井网产能快速评价。图3表2参28 Key words: 5-spot well pattern, productivity estimation, equivalence radius, horizontal-vertical combined well pattern
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