考虑结盐影响的储气库注采气井产能评价方法

Productivity evaluation method of gas injection-production wells in gas storage considering the effect of salt deposition

任众鑫 王多才 蒋平 李尧

国家管网集团西气东输公司，上海 200120 西安华线石油科技有限公司，陕西 西安 710065

含高矿化度地层水储气库气井在注采过程中由于压力变化可能出现地层结盐现象，影响储气库正常运行，且使常规产能模型不适用于结盐储气库井。因此，通过气水闪蒸计算模型研究建立结盐量计算方法，考虑结盐量对储层物性的影响规律构建结盐气井的拟压力计算公式及对应的产能方程，并进行解析模型的模拟分析及实例的拟合计算，同时与常规产能方程计算结果进行对比分析。研究结果表明，地层结盐明显地降低储层渗透率，造成储层伤害，同时明显降低气井产能。实例分析表明，文中所构建的产能评价模型可用于计算结盐储气库井注采产能评价，这对存在结盐储层的气藏生产、储气库注采的动态评价与预测具有重要意义。

Salt deposition may occur in the formation due to pressure changes during the injection-production process in gas storage wells containing high salinity formation water, which affects the normal operation of the gas storage reservoir and results in conventional productivity models no longer being applicable to salt deposition in gas storage wells. Therefore, a calculation method for salt deposition was established through the study of a gas-water flash calculation model, and a pseudo pressure calculation formula and corresponding productivity equation for salt deposition gas wells were constructed considering the influence of salt deposition on reservoir physical properties. The simulation analysis of the analytical model and the fitting calculation of the example were conducted, and the results were compared and analyzed with the calculation results of conventional productivity equation. The research results show that salt deposition significantly reduces reservoir permeability, resulting reservoir damage and further significantly reduces gas well productivity. It is shown that the constructed productivity evaluation model can be used to the injection-production capacity evaluation of gas storage wells with salt deposition, which is of great significance for gas reservoir production and the dynamic evaluation-prediction of injection-production in gas storage with salt deposition.

10.6056/dkyqt202304004