基于含水率定量计算的低渗气藏流体性质判别方法

Fluid property discrimination method based on quantitative calculation of water cut for low permeability gas reservoir

夏瑜 陈浩 单理军 姚锋盛 胡文亮

中海石油（中国）有限公司上海分公司，上海 200335

Shanghai Branch of CNOOC Ltd., Shanghai 200335, China

西湖凹陷低渗气藏在开发过程中普遍产水，影响到后续开发效果，为了有效开发低渗气藏，为下步开发方案设计提供参考依据，有必要弄清储层产液性质。文中基于低渗岩心稳态法相渗实验数据，通过多元非线性回归建立相对渗透率与含气饱和度之间的定量计算模型，结合测井资料计算的含水饱和度和束缚水饱和度可以准确计算储层的气相、水相相对渗透率及含水率，进而利用生产井的水气比标准来确定气藏不同流体的含水率分布区间。应用效果表明，该方法预测的产水率与测试结论吻合较好，能较准确地判断低渗气藏产液性质，为勘探开发方案的设计与实施提供了理论基础。

In the development of low-permeability gas reservoirs in Xihu Depression, the water production is common, which affects the later development effect. In order to effectively develop low-permeability gas reservoirs and provide reference for the next development plan design, it is necessary to clarify the liquid production property of the reservoir. Based on the steady-state relative permeability experimental data of low-permeability reservoir core, the quantitative calculation model between relative permeability and gas saturation is established through multiple nonlinear regression analysis. Water saturation and irreducible water saturation are calculated by logging data, which can accurately calculate gas and water phase permeability of reservoir and water content. The water content distribution range of different fluids in gas reservoir is determined by using the water-gas ratio standard of the produced wells. The application effect of this method shows that the predicted water content is in good agreement with the test conclusion, and it can accurately judge the liquid production property of low permeability gas reservoir, which provide a theoretical basis for the design and implementation of the exploration and development plan.

10.6056/dkyqt202103018