枯竭层状砂岩气藏改建储气库注采能力评价——以Z气藏为例

Evaluation of the injection-production capacity of reconstructed gas storage in depleted stratified sandstone gas reservoirs:A case study of Z gas reservoir

开发后期的枯竭气藏,由于天然的密封性等条件,在改建储气库方面具有显著优势,储气库注采能力是影响储气库运行效率的关键因素。结合系统试井和动态模型法评价气井产能,建立准确度更高的气井产能方程;利用节点压力综合评价方法,应用储层特征、管径、冲蚀、携液等多因素耦合确定合理注采气能力。综合分析确定不同井型下的Z储气库改建管径、配产等技术政策,为编制Z储气库方案提供技术支持,为同类储气库建设提供借鉴。

The depleted gas reservoirs in the late stage of development have significant advantages in the modification of the gas storage due to natural sealing,and the injection-production capacity is a key factor affecting the operational efficiency of the gas storage.Combined with systematic well testing and dynamic modeling method for evaluating gas well capacity,a more accurate gas well capacity equation is established.Using the nodal pressure comprehensive evaluation method,the multiple factors such as reservoir characteristics,tubing diameter,erosion,and fluid-carrying are applied to determine the reasonable gas injection-production capacity.Through the comprehensive analyses,the type of tubing and production capacity matching of Z gas storage reconstruction under different well types are determined,to provide technical support for the preparation of the Z gas storage scheme,and a reference for the construction of similar gas storage.