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限流法压裂是低渗透多油层油藏挖潜改造的主要方法 ,它设计的关键是各层射孔方案的优化。传统的方法是根据各小层的厚度确定射孔数 ,再由射孔数按比例计算施工过程中各层进液量和砂量 ,没有综合考虑各层的物性对改造规模和射孔数的影响 ,以及施工过程中井筒、炮眼和裂缝内摩阻等对各层进液量的影响。建立了限流法压裂施工过程中各层流量随时间、地层物性和射孔数变化的数学模型 ,与裂缝几何参数模型联立可进行射孔方案优化设计。通过大庆长垣内部油田 2 2口井的试验 ,取得了较好的增产效果和经济效益。
The current-limit fracturing is the main method of tapping the potential for low-permeability multi-reservoirs. The key of this design is the optimization of perforation schemes. The traditional method is to determine the number of perforation according to the thickness of each small layer, and then calculate the influent and sand content of each layer in the process of construction by the number of perforations. There is no comprehensive consideration of the physical properties of each layer to the scale and number of perforations Influence, as well as the construction process of the wellbore, blasthole and internal friction resistance of the various layers into the liquid volume. The mathematical model of the flowrate change with time, formation property and perforation of each layer in the process of fracturing by the current-limiting method was set up, and the perforation scheme optimization design was established jointly with the fracture geometry parameter model. Through the experiment of 22 wells inside Daqing Changyuan Oilfield, better yield increase and economic benefits have been achieved.