基于多相流的致密气藏水平井产量分析方法
Production Analysis Method of Horizontal Well in Tight Gas Reservoir Based on Multiphase Flow
摘要: 由于一些致密气藏的含水饱和度较高，气井产水现象在开发过程中较为常见。为了将产量分析方法应用气水两相流的致密气藏缝网压裂水平井生产数据分析，提出了基于气井的生产数据判别气井产水类型的方法，分析了致密气藏缝网压裂水平井的渗流特征，改进了纯气井产量分析方法使其适用于产水气井的产量分析。结果表明：通过分析气井的生产水气比和水化学特征能有效判别气井的产液类型和对开发的影响；致密气藏缝网压裂水平井的渗流特征不同与常规的三线性模型，压裂改造区存在三种连续渗流介质(基质、微裂缝、主压裂缝)；基于单相气流的产量分析方法在分析产水气井时，由于忽略了渗流通道中的地层水，导致拟合的渗透率偏小，EUR偏大。可见，气水两相流的致密气藏缝网压裂水平井产量分析方法适用于产水气井生产数据分析。
Abstract: In tight sandstone gas reservoirs with high water saturation, water production from gas wells is common during development. In order to analyze the production characteristics of horizontal wells after water production through fracture pattern fracturing, a set of methods for distinguishing the type of water production in gas wells was proposed. Based on the analysis of seepage characteristics of horizontal wells with fracture pattern fracturing in tight sandstone gas reservoirs, the production analysis method for pure gas wells is improved to make it suitable for production analysis of water producing gas wells. The example analysis results show that: By analyzing the production water gas ratio and hydrochemical characteristics of a gas well, the water production type of the gas well can be effectively identified; In the fracturing and reconstruction area of a horizontal well with fracture pattern fracturing in tight sandstone gas reservoirs, there are three continuous seepage media (matrix, microfracture, and main pressure fracture), which conform to the percolation characteristics of a trilinear model; When using traditional production analysis methods to analyze water producing gas wells, the matching permeability is relatively small and the dynamic reserves are relatively large due to ignoring the seepage of the water phase. It is concluded that the production analysis method for fractured horizontal wells in tight sandstone gas reservoirs with gas water two-phase flow is suitable for production data analysis of water producing gas wells.
文章引用：吉礼东. 基于多相流的致密气藏水平井产量分析方法[J]. 矿山工程, 2024, 12(3): 341-349. https://doi.org/10.12677/me.2024.123040

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