异常高压气藏气水两相流井产能分析方法

发布时间：2018-07-05 08:45

本文选题：含水气藏 + 异常高压气藏　；参考：《石油勘探与开发》2017年02期

【摘要】：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。
[Abstract]:The productivity analysis method of abnormal high pressure gas reservoir gas-water two-phase flow wells considering the variation of gas-water two-phase percolation ability, the elastic driving energy of reservoir and fluid and the change of reservoir physical property caused by stress sensitivity are put forward. The influence of various factors on gas production is analyzed with an example. Based on the generalized Darcy formula and the law of conservation of mass, the steady and unsteady seepage mathematical models considering the change of reservoir stress-sensitive and gas-water two-phase seepage capacity are established, and the corresponding gas production equations are derived. The results of practical analysis show that the increase of water cut in reservoir results in the decrease of gas-phase percolation capacity and the decrease of gas production, and the influence of gas-water two-phase percolation capacity on gas production cannot be ignored in the process of productivity evaluation of gas-water two-phase flow wells. When the pressure difference is small, the gas production rate changes little with the increase of the stress sensitivity of the reservoir, while the gas production rate decreases significantly with the increase of the stress sensitivity of the reservoir when the production pressure difference is large. For the stress-sensitive gas reservoir, the initial production pressure difference should not be too high.
【作者单位】：中海石油(中国)有限公司湛江分公司;中国地质大学(北京);
【基金】：“十三五”重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术”(2016ZX05024005)
【分类号】：TE328

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