砂岩粘弹性表面活性剂分流剂分流酸化技术

针对砂岩粘弹性表面活性剂胶束凝胶分流剂分流酸化的特点，建立了胶束凝胶分流模型和能反映包括分流剂在内的各种工作液工作状况的实时监测模型。模型引入粘性表皮系数来反映注入的粘性流体与油藏流体之间的差异造成的压力响应；通过计算实例分析了各小层渗透率差异和表皮系数差异对分流设计的影响，量化了粘性分流效果；通过处理过程中实时录取的排量、时间和压力等数据来计算总表皮系数，用总表皮系数减去粘性表皮系数，酸化措施过程中真实表皮系数的演变就可进行实时监测，从而可对胶束凝胶分流剂分流酸化施工过程进行调整和优化。该方法同样适用于其他粘性分流剂的分流酸化设计中。

The Technology of Viscoelastic Surfactant-based Diverting Agents for Sandstone Diversion Acidizing

Based on typical behaviors of sandstone diversion acidizing by viscoelastic surfactant-based diverter, micellar gel diverting model and real-time monitoring model were established, which reflected the running status of all kinds of working solution including diverting agents. The model introduces a viscous skin factor to describe the effect of the viscosity difference between the injected fluid and the reservoir fluid on the pressure response. Effects of sub-formation permeability difference and skin factor difference on division acidizing program design is also demonstrated by case study. By subtracting viscous skin factor from the total skin factor obtained from the rate and pressure recorded during the treatment, the true damage skin factor during an acid treatment is obtained and real-time monitoring of its evolution is made possible, so the execution can be adjusted and optimised. This method is applicable to division acidizing program design with other viscous diverter.