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科技导报  2015 

改进的低渗透底水气藏压裂井见水时间预测公式

DOI: 10.3981/j.issn.1000-7857.2015.09.006, PP. 40-45

Keywords: 低渗透,底水气藏,压裂井,有限导流,见水时间

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Abstract:

低渗透底水气藏中的气井在实际生产中需通过压裂改造获得工业产能,预测压裂井见水时间对合理开发该类气藏具有重要指导意义。针对低渗透底水气藏压裂井的渗流特征,将渗流场划分为射孔段及其下部两个部分,以稳态渗流理论为基础,分别建立了符合各区渗流状态的产能方程,结合水锥顶点的运动方程建立了低渗透底水气藏压裂井见水时间预测公式。实例计算表明,压裂井能显著延缓气井见水时间,利用本方法计算的见水时间更接近实际。敏感性分析表明,随气藏打开程度增加,气井见水时间先增大后减小;增大裂缝半长及裂缝导流能力都将延缓气井见水,但增加幅度逐渐降低,存在最优值。

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