天然气勘探与开发2025，Vol.48Issue(5)：101-111,11.DOI:10.12055/gaskk.issn.1673-3177.2025.05.010
非均质性边水气藏水体活跃程度定量预测新方法
A new method for quantitative prediction of aquifer activity in heterogeneous edge-water gas reservoirs
摘要
Abstract
In order to accurately assess the aquifer activity in heterogeneous edge-water gas reservoirs and its influence on development and production,seepage mathematical models for two typical water-invasion patterns were established based on oil-gas reservoir seepage mechanics theory.The charts for predicting the gas recovery factor at the time of formation water breakthrough(hereinafter referred to as water breakthrough)in gas reservoirs under various conditions were compiled by numerical solution method.In addition,a number of typical well blocks in the Sichuan Basin were selected for case analysis to verify the effectiveness of the prediction method.The following results are obtained.(i)During the development of heterogeneous edge-water gas reservoirs,formation water advances nonuniformly along the well-developed fracture channels.Permeability contrast and aquifer-to-reservoir pore-volume ratio significantly influence the gas recovery factor when water breakthrough occurs.(ii)The charts for predicting the gas recovery factor at the time of water breakthrough under different permeability contrasts and aquifer-to-reservoir pore-volume ratios can quantitatively characterize and dynamically predict the aquifer activity in gas reservoirs.(iii)The new method provides good case analysis results of the typical well blocks.The comparison of the predicted recovery factor at water breakthrough with the actual data shows an average relative error of less than 5%,indicting the great accuracy and effectiveness of the method.It is concluded that the newly established method for quantitatively predicting the aquifer activity in heterogeneous edge-water gas reservoirs is beneficial to early formulation of development control countermeasures,extending the economic production period and improving recovery factor of water-bearing gas reservoirs.This method is suitable for the gas reservoirs with formation water invading through simple and high-permeability channels,but not fully applicable to the water-bearing gas reservoirs with longitudinal high-conductivity fractures or complex fracture networks.关键词
四川盆地/有水气藏/储层非均质性/水体活跃程度/预测方法/定量分析/天然气采出程度/渗流数学模型Key words
Sichuan Basin/Water-bearing gas reservoir/Reservoir heterogeneity/Aquifer activity/Prediction method/Quantitative analysis/Gas recovery factor/Seepage mathematical model分类
能源科技引用本文复制引用
王会强,魏星,尹小红,郑果,谭晓华,赵益..非均质性边水气藏水体活跃程度定量预测新方法[J].天然气勘探与开发,2025,48(5):101-111,11.基金项目
中国石油天然气股份有限公司科技专项"致密砂岩气藏提高采收率关键技术研究——新区效益建产关键技术研究"(编号:2023ZZ25YJ004). （编号:2023ZZ25YJ004）
