地层压力和产水对低渗透气藏气井产能的影响Influence of Formation Pressure and Producing Water on Productivity of Gas Well in Low-Permeability Gas Reservoirs
汪周华;王子敦;郭平;邓丹;廖华伟;
摘要(Abstract):
通常情况下,随着地层压力降低,储层渗透率及流体性质的变化会导致气井产能方程随之发生变化。对于低渗透产水气藏,由于应力敏感、紊流效应、滑脱效应等非线性渗流效应及后期产水的影响,气井产能急剧降低。为了定量评价以上因素对气井产能的影响,基于常规二项式产能方程,建立了综合考虑地层压力变化、非线性渗流效应及产水对气井产能影响的产能方程。通过实例计算表明,由于应力敏感、紊流效应、滑脱效应等非线性渗流效应的综合影响,二项式系数A随地层压力的降低而减小,而系数B随地层压力的降低而增大;此外,由于后期产水影响,含水饱和度不断上升,气相相对渗透率随水气比的上升而减小,使二项式系数A、B均随水气比的上升而增大;因此,气井的产能下降幅度随地层压力下降呈线性升高趋势,随水气比下降呈对数降低趋势。该研究成果对于低渗透产水气井的产能预测及分析具有指导作用。
关键词(KeyWords): 低渗透;产水气井;气井产能;应力敏感;滑脱效应;水气比
基金项目(Foundation): 国家科技重大专项“致密砂岩气有效开发评价技术”(2011ZX05013-002)
作者(Author): 汪周华;王子敦;郭平;邓丹;廖华伟;
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DOI:
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