汪周华;王子敦;郭平;邓丹;廖华伟;

• 1:西南石油大学油气藏地质及开发工程国家重点实验室
• 2:吐哈油田公司勘探开发研究院

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

Abstract:

Keywords:

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;

Email:

DOI:

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