超深层碳酸盐岩气藏流动物质平衡新方法

New method of flowing material balance in ultra deep carbonate gas reservoirs

蔡珺君 彭先 余平 李隆新 刘微 王蓓 毛正林 李军 胡怡

中国石油西南油气田公司勘探开发研究院，四川 成都 610041 重庆页岩气勘探开发有限责任公司，重庆 401121 中国石化中原油田分公司技术监测中心，河南 濮阳 457001）

超深层碳酸盐岩气藏一般具有压力高、含硫、非均质性强等特点，动态监测风险较高。为提升动态资料在气藏动态诊断中的作用，文中通过对考虑岩石弹性能量的物质平衡方程和气井拟压力形式的稳定渗流方程联合求解，推导了超深层常压—高压气藏拟压力形式的流动物质平衡方程。在此基础上，建立了水侵、井间干扰和动态储量增加影响下的流动物质平衡方程修正式，并提出结合动态资料建立气井生产诊断图版以及水侵量、动态储量变化量的图解方法。四川盆地超深层碳酸盐岩气藏的矿场应用揭示，采用文中方法，可以提前诊断弱舌进水侵、井间干扰和动态储量变化等信息。这是对常规动态监测方法的有效补充，并为开发管理部门及时掌握气藏动态和科学决策奠定坚实的基础。

Ultra deep carbonate gas reservoirs are generally characterized by high pressure, high sulfur content and strong heterogeneity, so the risk of dynamic monitoring is high. In order to improve the role of dynamic data in gas reservoir diagnosis, this paper derived the pseudo pressure flow material balance(FMB) equation of ultra deep gas reservoir with normal-high pressure by considering the joint solution of rock elastic energy material balance equation and gas well pseudo pressure stable seepage equation. On this basis, the modified FMB equation under the influence of water invasion, interwell interference and increase of dynamic reserves were given, and the theoretical chart of production diagnosis of gas well and the graphic method of water invasion and dynamic reserves change were established based on dynamic data. The field application of ultra deep carbonate gas reservoirs in Sichuan Basin revealed that this method can diagnose the information of weak water tonguing, interwell interference and dynamic reserve change in advance, which is an effective supplement to the conventional dynamic monitoring method, and lays a solid foundation for the development management department to timely grasp the gas reservoir performance and make scientific decisions.

10.6056/dkyqt202304018