...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy & fuels >New Method To Prepare Outcrop Chalk Cores for Wettability and Oil Recovery Studies at Low Initial Water Saturation
【24h】

New Method To Prepare Outcrop Chalk Cores for Wettability and Oil Recovery Studies at Low Initial Water Saturation

机译：一种制备露头白垩岩芯的新方法，用于低初始水饱和度下的润湿性和采油率研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The initial water saturation in North Sea chalk reservoirs is extremely low, often in the range of 5-7%. Outcrop material is often used to perform parametric studies on wettability and secondary oil recovery by water injection. To relate the experiments to a certain reservoir, it is desirable to mimic the reservoir conditions as closely as possible. This is done using outcrop cores. The cores are usually drilled in the same direction from the same block, dried at 120 ℃, evacuated, and saturated with the actual brine. Homogeneous water saturation can be obtained by draining the initial brine to a saturation of less than 10% by using water-saturated nitrogen gas and a porous plate. During this process, the water saturation is decreased from 100% to less than 10%. Potential determining ions like Mg~(2+), Ca~(2+), CO_3~(2-), and SO_4~(2-) present in the brine or as salt initially present in the core will adsorb onto the chalk surface. Thus, during the drainage process, the potential determining ions are increased in concentration inside the core, and the apparent concentration in the residual water becomes different from the initial brine. The wetting condition obtained during an aging period at 90 ℃ is very sensitive to the concentration of SO_4~(2-) in the initial brine. Outcrop chalk cores that were preflushed with 4 pore volumes of distilled water to remove SO_4~(2-) appeared to be much less water-wet compared to cores not preflushed in the same way. The amount of SO_4~(2-) present before and after flooding with distilled water was quantified. A new standard procedure to prepare outcrop chalk cores for wettability studies is suggested: (1) The cores must be flooded with distilled water or formation brine without SO_4~(2-) to remove SO_4~(2-) that may be present initially. (2) The initial saturation brine must not contain SO_4~(2-).
机译：北海白垩储层的初始水饱和度极低，通常在5-7％的范围内。露头材料通常用于对注水的润湿性和二次采油进行参数研究。为了使实验与某个储层相关联，希望尽可能接近地模拟储层条件。这是使用露头核心完成的。通常在同一块中以相同的方向钻取岩心，然后在120℃下干燥，抽空并用实际的盐水饱和。通过使用水饱和的氮气和多孔板将初始盐水排至小于10％的饱和度，可以获得均质的水饱和度。在此过程中，水饱和度从100％降低到小于10％。存在于盐水中或最初存在于岩心中的盐等潜在的决定性离子，例如Mg〜（2 +），Ca〜（2 +），CO_3〜（2-）和SO_4〜（2-），将吸附到白垩表面。因此，在排水过程中，电势确定离子在核内的浓度增加，并且残留水中的表观浓度变得不同于初始盐水。在90℃时效过程中获得的润湿条件对初始盐水中SO_4〜（2-）的浓度非常敏感。与未以相同方式进行预冲洗的岩心相比，用4孔体积的蒸馏水进行预冲洗以去除SO_4〜（2-）的露头白垩岩心的水润湿性要低得多。定量蒸馏水注入前后SO_4〜（2-）的含量。建议一种新的制备露头白垩岩芯用于润湿性研究的标准程序：（1）必须用蒸馏水或不含SO_4〜（2-）的地层盐水淹没岩芯，以去除最初可能存在的SO_4〜（2-）。 （2）初始饱和盐水不得含有SO_4〜（2-）。

著录项

  • 来源
    《Energy & fuels》 |2007年第6期|p.3425-3430|共6页
  • 作者

    Tina Puntervold; Skule Strand; Tor Austad;

  • 作者单位

    University of Stavanger, 4036 Stavanger, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TK-;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号