Abstract:

After the commissioning of gas storage facilities in edge-bottom water gas reservoirs, issues such as insufficient storage capacity and reduced peak shaving capacity often arise. In response to the differentiated vertical water invasion distribution and complex fault characteristics in block M, a differentiated water energy modeling method was adopted to simulate the impact of 3.2 to 14.0 times of water energy on the operation of the gas storage. The static evaluation of fault SGR was combined with dynamic failure prediction pressure, and the safe operation pressure of the gas storage was designed based on the "short board effect". Various well patterns were simulated and compared. Ultimately, a composite well pattern featuring "horizontal wells as the mainstay and vertical wells as a supplement" was adopted, with the deployment of 22 injection-production wells. A water control strategy of "low-speed slow injection at high structural positions" was implemented, leveraging the well pattern dominated by horizontal wells to enhance injection-production efficiency. The daily gas injection capacity of a single well reached 340 000 cubic meters, which is 2.1 times that of a vertical well. Practice has confirmed the feasibility of constructing gas storage facilities in edge-bottom water gas reservoirs, and this study provides important reference value for the optimal design of similar gas storage facilities.

Key words: Edge-bottom water gas reservoir, Numerical simulation, Water body energy, Well pattern design

摘要：

边底水气藏储气库投运后常面临库容量不足和调峰能力下降等问题。针对M区块纵向上水侵差异化分布以及断层复杂性特征，采取差异化水体能量建模法，模拟了3.2~14.0 倍水体能量对储气库运行的影响，并将断层静态评价与动态失效预测压力相结合，按“短板效应”设计了储气库安全运行压力；模拟并对比了多种井网形式，最终设计采用“水平井主导、直井辅助”的复合井网模式，部署了22口注采井。采取“高部位低速缓注”的控水策略，发挥水平井为主导的井网模式，提升了注采效率，单井日吸气能力达到34 万m³，是直井的2.1 倍。实践证实了边底水气藏建设储气库的可行性，该研究为同类型储气库的优化设计提供了重要的参考价值。

关键词: 边底水气藏, 数值模拟, 水体能量, 井网设计