石油学报 ›› 2007, Vol. 28 ›› Issue (4): 95-98.DOI: 10.7623/syxb200704019

• 油田开发 • 上一篇    下一篇

致密储层应力敏感性及其对油田开发的影响

于忠良1, 熊伟1, 高树生1, 刘军平2   

  1. 1. 中国科学院渗流流体力学研究所 河北廊坊065007;
    2. 西安石油大学 陕西西安710065
  • 收稿日期:2006-10-30 修回日期:2006-12-30 出版日期:2007-07-25 发布日期:2010-05-21
  • 作者简介:于忠良,男,1981年10月生,2004年毕业于石油大学(华东),现为中国科学院渗流流体力学研究所在读硕士,主要从事油气藏开发实验与数值模拟研究.E-mail:yu_zhong_liang@126.com
  • 基金资助:
    国家重点基础研究发展规划(973)项目(2006CB202404)“碳酸盐岩缝洞型油藏开发基础研究”资助

Stress sensitivity of tight reservoir and its influence on oilfield development

Yu Zhongliang1, Xiong Wei1, Gao Shusheng1, Liu Junping2   

  1. 1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
    2. Xi'an Shiyou University, Xi'an 710065 China
  • Received:2006-10-30 Revised:2006-12-30 Online:2007-07-25 Published:2010-05-21

摘要: 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。

关键词: 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: The relationship between permeability and net stress of tight reservoir was experimentally studied,and a method to evaluate permeability-stress sensitivity was established on the basis of the original net stress of reservoir rather than the low net stress.This method can correctly reflect the change of pore structure,and the quadratic polynomial curve can capture the nuances of the stress sensitivity.The permeability damage caused by the elastic and plastic distortion is permanent and irreversible.The pore structure tested by scanning electron microscope and rate-controlled mercury penetration showed that porosity was weakly affected by permeability-stress sensitivity,while the size and shape of throat determined the degree of permeability-stress sensitivity.The theoretical calculation shows that there is a cone of permeability depression near the well bottom.The stress sensitivity has some influence on oil production.

Key words: tight reservoir, net stress, stress sensitivity, permeability, pore structure, oilfield development

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