The application of multi-stage fractured horizontal well (MSFHW) due to its costly operation necessitates optimization of associated fracture parameters to ensure its economic success. In comparison to significant number of studies dedicated to use of MSFHWs for shale gas reservoirs, there are only few researches available for oil systems. This study explores the optimum criteria for a number of important fracture parameters in low-permeability heavy-oil systems. For this purpose, a response surface methodology (RSM) was employed to examine the simultaneous effect of four fracture parameters, including the number of fracture stages, fracture length, fracture width and fracture conductivity, on well productivity. The evaluations were conducted on two homogeneous and heterogeneous permeability systems. The optimization of fracture parameters was also performed on an economic basis by utilizing the net present value (NPV) concept. Useful charts were also generated providing practical insights into the individual and combinational effects of fracture parameters on well performance. The results from this study demonstrated that the fracture conductivity and the number of fracture stages were, respectively, the first two important parameters controlling the well productivity for rock systems with higher permeability. However, when rock texture became tighter, the number, and to a lesser extent the length, of fractures exhibited more evident role on production improvement, especially in the case of heterogeneous reservoirs. The results also underlined the significance of economic considerations, in particular, when determining the optimum fracture length and number of fracture stages.

由于多级压裂水平井（MSFHW）的昂贵运营成本，因此必须优化相关压裂参数以确保其经济成功。与大量致力于将MSFHW用于页岩气储层的研究相比，仅有很少的石油系统研究可用。这项研究探索了低渗透稠油系统中许多重要裂缝参数的最佳标准。为此，采用响应面方法（RSM）来检验四个裂缝参数（包括裂缝级数，裂缝长度，裂缝宽度和裂缝电导率）对油井产能的同时影响。在两个均质和非均质渗透率系统上进行了评估。还通过利用净现值（NPV）概念在经济基础上对裂缝参数进行了优化。还生成了有用的图表，可提供有关裂缝参数对井眼性能的个别和综合影响的实际见解。这项研究的结果表明，裂缝电导率和裂缝级数分别是控制具有较高渗透率的岩石系统的井产量的前两个重要参数。但是，当岩石质地变紧时，裂缝的数量和长度的较小程度在提高产量方面显示出更明显的作用，尤其是在非均质油藏的情况下。结果还强调了经济考虑的重要性，特别是，