Y21区块含水层储气库边底水侵入数值模拟

Numerical simulation of water intrusion at the edge and bottom of Y21 gas storage with aquifer

张鹏,徐耀东,杨志伟

ZHANG Peng, XU Yaodong, YANG Zhiwei

中国石化胜利油田分公司勘探开发研究院，山东 东营 257000

Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

天然气在中国能源战略格局中所占比重日益增加，调峰能力是天然气生产和销售环节的重要指标，在无废弃油气藏的大中型城市周边建设含水层储气库是储存天然气的重要途径。Y21储气库是利用水淹废弃气藏改建的。该气藏目前已整体水淹，可视为含水圈闭。文中利用Y21区块的地质成果、生产数据和测试资料等，建立了Y21区块含水层储气库地质模型，在地质模型的基础上，开展了含水层储气库数值模拟。首先，根据气藏工程理论计算水体体积和水侵系数；然后，利用数值模拟方法调整水体参数，分析数值模拟适用的水体类型；最后，对Y21区块地层压力进行拟合，拟合结果满足Y21井及Y21-1井的地层压力。该研究可为含水层储气库的库容预测及平稳运行管理提供技术支撑。

Natural gas accounts for an increasing proportion in Chinese energy strategy. Peak regulation capacity is an important indicator of natural gas production and sales. Building gas storage with aquifer around large and medium-sized cities without abandoned oil and gas reservoirs is an important way to store natural gas. Y21 is a gas storage rebuilded by abandoned flooding reservior, which is already flooded overall at present. Y21 gas storage can be regarded as a trap with aquifer. Based on the geological achievements, production data, test data and other data of Y21 abandoned gas reservoir in this paper, geological model of Y21 gas storage with aquifer is established. Numerical simulation model of gas storage with aquifer is established by the geological model. Firstly, the volume of water and water invasion coefficient are calculated by the gas reservoir engineering theory. Then, the water parameters are adjusted by numerical simulation method to analyze water type that applicable to numerical simulation. Finally, the formation pressure of Y21 block is fit, the results satisfy formation pressure of Y21, Y21-1 well. The research result can provide technology support for predicting storage capacity and operations management of  gas storage with aquifer.

10.6056/dkyqt202106012