酸化井试井解释新模型及应用

酸化是油、气、水井增产增注的重要措施,压力不稳定试井是评价酸化效果的主要手段。重点研究了油层酸化后孔隙度和渗透率变化条件下的不稳定渗流问题,给出了孔隙度和渗透率变化的指数模式,建立了变孔隙度、渗透率试井分析模型,应用有限元方法求得了模型的数值解,得到了井底压力随时间变化的双对数理论曲线,并对理论曲线的特征进行了分析。通过实际井例分析,说明该模型具有较好的应用效果,为更准确地评价酸化效果提供了一种方法。

New Well Test Interpretation Model and Application for Acid Treatment Well

Acid treatment is an important measure to improve production and injection for producer and injector, and pressure transient well test is one of methods for evaluating effects of acid treatment. This paper studies pressure transient behavior of a well when porosity and permeability changed with acid treatment. The well test model is established by considering the exponential change of the porosity and permeability with radial distance. The wellbore pressure typical curves have been calculated by FEM method and their characteristics have been analyzed. The case analysis shows that the application of the well test model given by this paper has a satisfied result, and give a method for evaluating acid treatment more accurately.