油气田开发

渗透率对致密砂岩储集层渗吸采油的微观影响机制

  • 谷潇雨 ,
  • 蒲春生 ,
  • 黄海 ,
  • 黄飞飞 ,
  • 李悦静 ,
  • 刘杨 ,
  • 刘恒超
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  • 1. 中国石油大学(华东)石油工程学院,山东青岛 266580;
    2. 西安石油大学石油工程学院,西安 710065
谷潇雨(1989-),男,陕西西安人,中国石油大学(华东)石油工程学院在读博士研究生,主要从事低渗透油藏开发地质及渗吸采油等方面研究。地址:山东省青岛市黄岛区长江西路66号,中国石油大学(华东)石油工程学院,邮政编码:266580。E-mail: 458570670@qq.com 联系作者简介:蒲春生(1959-),男,四川广安人,中国石油大学(华东)石油工程学院教授,主要从事低渗、特低渗、稠油、超稠油等特种油气藏物理-化学强化开采及资源环境保护理论与技术方面的研究工作。地址:山东省青岛市黄岛区长江西路66号,中国石油大学(华东)石油工程学院,邮政编码:26658。E-mail: chshpu@163.com

收稿日期: 2017-02-21

  修回日期: 2017-10-20

  网络出版日期: 2017-11-24

基金资助

国家科技重大专项(2009ZX05009,2011ZX05001); 国家自然科学基金(51104173,51274229)

Micro-influencing mechanism of permeability on spontaneous imbibition recovery for tight sandstone reservoirs

  • GU Xiaoyu ,
  • PU Chunsheng ,
  • HUANG Hai ,
  • HUANG Feifei ,
  • LI Yuejing ,
  • LIU Yang ,
  • LIU Hengchao
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  • 1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;
    2. School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China

Received date: 2017-02-21

  Revised date: 2017-10-20

  Online published: 2017-11-24

摘要

以鄂尔多斯盆地富县地区延长组长8段致密砂岩储集层样品为例,通过自发渗吸模拟实验,结合核磁共振与CT扫描分析,进一步揭示了致密储集层渗透率对渗吸采油效率的微观影响机制。研究结果表明:①基质自发渗吸排驱在致密砂岩储集层注水开发中起着至关重要的作用,实验岩心样品自发渗吸采出程度可以达到5.24%~18.23%,且基质的渗透率越大,自发渗吸采出程度越高;②受吸附层厚度的影响,亚微米级以上孔隙在致密储集层的渗吸驱油过程中起主导作用,纳米—亚微米级孔隙对渗吸采出程度贡献相对较弱;③孔喉的连通性是导致致密储集层基质渗透率与渗吸排驱采油效率呈正相关的主要微观影响机制。不同渗透率样品亚微米—微米级孔隙尺寸分布的差异并不大,但随着渗透率的增加,连通孔喉个数与连通面孔率均呈指数递增,导致渗吸排驱采出程度显著提高。图7表3参28

本文引用格式

谷潇雨 , 蒲春生 , 黄海 , 黄飞飞 , 李悦静 , 刘杨 , 刘恒超 . 渗透率对致密砂岩储集层渗吸采油的微观影响机制[J]. 石油勘探与开发, 2017 , 44(6) : 948 -954 . DOI: 10.11698/PED.2017.06.12

Abstract

Taking the Chang 8 tight sandstone reservoir of the Yanchang Formation of Fuxian area in Ordos Basin as an example, the influencing mechanism of permeability on imbibition recovery in tight sandstone was explored by spontaneous imbibition experiment, combining nuclear magnetic resonance (NMR) and CT Scanning. Results show that: (1) spontaneous imbibition played a vital role in water-flooding of the tight sandstone reservoir, the recovery by spontaneous imbibition of experimental core samples can reach 5.24% - 18.23%, and the higher the matrix permeability, the higher the recovery degree by spontaneous imbibition; (2) because of the thickness of adsorbed layer, pores above sub-micron scale made a great contribution to the imbibition recovery of tight sandstone reservoir, and nano-submicron pores made less contribution to imbibition recovery; (3) the connectivity of pore and throat was the major microscopic mechanism of the positive correlation between matrix permeability and spontaneous imbibition recovery. Samples of different permeability didn’t differ much in the sizes of sub-micron to micron pores, but with the rise of permeability, the connected pores and throats and surface porosity increased exponentially, leading to significant increase of imbibition recovery.

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