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提出了综合考虑气水两相渗流能力变化、储集层与流体的弹性驱动能量和应力敏感引起的储集层物性变化等因素的异常高压气藏气水两相流井产能分析方法,并结合实例分析了各因素对产气量的影响。基于广义达西公式和质量守恒定律建立了考虑储集层应力敏感和气水两相渗流能力变化的稳态及非稳态渗流数学模型,推导了相应的产气量方程。实例分析结果表明:储集层含水率上升造成气相渗流能力减小,导致产气量降低,在气水两相流井产能评价过程中不能忽视气水两相渗流能力变化对产气量的影响;生产压差较小时产气量随储集层应力敏感性增强变化不大,而生产压差较大时产气量随储集层应力敏感性增强显著减小,对于应力敏感性气藏,初期生产压差不宜过高。
A productivity analysis method of gas-water two-phase flow well with abnormally high pressure gas reservoir considering factors such as changes of gas and water permeability, elastic driving energy of reservoir and fluid, and changes of reservoir physical properties caused by stress sensitivity is proposed The example analyzes the influence of various factors on gas production. Based on the generalized Darcy formula and the law of conservation of mass, steady-state and unsteady seepage mathematical models considering reservoir stress sensitivity and gas-water two-phase seepage are established, and corresponding gas production equations are derived. The case study shows that the increase of water cut in reservoir leads to the decrease of gas flow and the decrease of gas production. The influence of gas-water two-phase seepage flow on gas production can not be neglected in gas-water two- When the pressure difference is small, the gas production will not change much with the increase of reservoir stress sensitivity. However, when the production pressure difference is large, the gas production will decrease remarkably with the increase of reservoir stress sensitivity. For the pressure-sensitive gas reservoir, the initial production pressure difference Should not be too high.