基于数值模拟的延长气田开发指标优化研究

Development Index Optimization of Yanchang Gas Field Based on Numerical Simulation

延长气田是典型的致密非均质气藏,开发难度较大。为了使气藏具有较长稳产期且有较高采收率,本研究基于气藏数值模型,结合历史生产数据,对采气速度和合理井距两项指标开展模拟预测和优化。结果表明,当采气速度提高至3%时,可实现气田经济高效开发;目前平均井距储量控制程度低,当降低井距至700 m时,累计产气量最高,后期可在储层不连片、动用程度较低的区域部署完善加密井,以提高储量控制程度和气田最终采收率。

Yanchang gas field is a typical tight heterogeneous gas reservoir,which has difficulties in development.In order to make the gas reservoir have a longer stable production period and higher recovery rate,this study based on the gas reservoir numerical model,combining with the historical production data,simulated,predicted and optimizated on gas recovery velocity and reasonable well spacing.The results showed that with the gas producting rate upping to 3%,well spacing reduing to 700 m in reservoirs with poor connectivity,small-scale effectives and bodies,the development of Yangchang gas field can be more economical and more efficient.