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Stress sensitivity of tight reservoir and its influence on oilfield development
Author(s): 
Pages: 95-98
Year: Issue:  4
Journal: ACTA PETROLEI SINICA

Keyword:  致密储层有效应力应力敏感性渗透率孔喉结构油田开发;
Abstract: 对致密储层的渗透率及应力敏感性进行了实验研究,建立了以原始储层有效应力(上覆岩层压力与原始储层孔隙压力之差)为有效应力起点的压敏评价方法.实验结果表明,该方法能够反映储层岩石的真实应力状态,其应力敏感伤害程度符合储层的真实情况,有效应力与渗透率之间符合二次多项式的关系.应力恢复实验表明,岩石的弹塑性变形使得压敏伤害成为一种永久的、不可逆的伤害.利用扫描电镜和恒速压汞实验,分析了应力敏感机理.孔隙受压敏影响较小,喉道的大小和形态决定了岩石的渗透率-应力敏感程度.从理论上计算了压敏对油田开发的影响,结果表明,在生产井井底附近的储层中存在渗透率漏斗,压敏伤害对油井产量有一定影响.
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