等效裂缝渗流模型在天然裂缝储层产能预测中的应用

 为了研究天然裂缝发育的低渗透油藏产能特征，根据连续介质理论，简化了裂缝系统，建立了天然裂缝的等效渗流模型，得到了等效渗流模型稳态渗流的产能方程。应用产能方程进行实例计算，所得单井产能结果与实际油田单井产能相符合，验证了该产能方程的正确性及适用性。分析了裂缝宽度、裂缝长度和裂缝渗透率对产能的影响，结果表明，裂缝长度对产能的影响更大；当裂缝渗透率和裂缝宽度达到一定值之后，要提高产量应主要增加裂缝的长度。

Application of Equivalent Fracture Flow Model for Productivity Prediction in Natural Fractured Reservoir

In order to investigate the productivity characteristics of low permeability reservoirs with natural fractures, the system of natural fractures was simplified and the equivalent fracture flow model was established based on the continuous medium theory. By using the equivalent permeability model, the steady-state productivity equation was set up in naturally fractured low-permeability reservoirs. The productivity equation was applied to an example calculation and the results were compared with the actual production data, to validate the model. The influences of fracture characterization parameters on productivity were analyzed by using the model. These fracture parameters include the fracture width, the fracture length and the fracture permeability. The results show that the fracture permeability has a more important effect on the productivity of naturally fracture low-permeability reservoirs. An important conclusion for better production response is as follows: when the fracture permeability and the fracture width reach a certain level, the longer the length of fracture is, the higher productivity could be obtained.