...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transport in Porous Media >Analysis of Sorption-Induced Permeability Reduction Considering Gas Diffusion Phenomenon in Coal Seam Reservoir
【24h】

Analysis of Sorption-Induced Permeability Reduction Considering Gas Diffusion Phenomenon in Coal Seam Reservoir

机译：考虑瓦斯扩散现象的煤层储层吸附诱导的渗透率降低分析

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 sorbed gas diffuses in a coal matrix, where diffusion varies considerably with pore structure and pressure. The diffusion is an essential factor due to high sorption affinity of on coal grain surface. The sorption within the matrix causes swelling or shrinkage of matrix, in which the amount of sorbed gas affects gas diffusion. In this study, in order to observe permeability change occurred when the sorbed gas diffuses in a coal matrix, experiments were conducted with a bituminous coal sample. Firstly, gas partial pressure was measured through a diffusion experiment with a transient flow method. Secondly, flowing experiments were conducted to examine the permeability reduction yielded by sorption phenomena according to the various pore pressures. The results were then analyzed for the effect of diffusion coefficient on permeability change. The diffusion coefficient of in low-pressure section was greater than that of owing to the difference in their molecular weight. However, as pressure increased, the diffusion coefficient of became greater because of higher sorption affinity of compared to . Finally, it was revealed that the gas diffused instantaneously in the case of crushed coal in which its diffusion coefficient had infinite value due to the destroyed pore structure. Meanwhile, in the coal core sample in which pore structure was preserved as original state, it was ascertained that diffusional flow occurred gradually corresponding to concentration gradient, and hence, the permeability was reduced accordingly. This phenomenon was also confirmed through pore images obtained from X-ray CT.
机译：吸附的气体在煤基质中扩散，扩散随孔隙结构和压力而变化很大。扩散是必需的因素，这是由于在煤颗粒表面上的高吸附亲和力。基质内的吸附导致基质膨胀或收缩，其中吸附的气体量影响气体扩散。在这项研究中，为了观察吸附气体在煤基质中扩散时发生的渗透率变化，对烟煤样品进行了实验。首先，通过瞬态流动法通过扩散实验测量气体分压。其次，进行了流动实验，研究了根据各种孔隙压力，吸附现象引起的渗透率降低。然后分析结果的扩散系数对渗透率变化的影响。由于其分子量的差异，低压区的扩散系数要大于低压区的扩散系数。但是，随着压力的增加，的扩散系数变得更大，这是因为的吸附亲和力高于。最后，揭示了在煤破碎的情况下气体瞬时扩散，其中由于孔隙结构的破坏其扩散系数具有无限大的值。同时，在将孔结构保持为原始状态的煤芯样品中，确定了扩散流与浓度梯度相对应地逐渐发生，因此渗透率相应降低。通过从X射线CT获得的孔图像也证实了该现象。

著录项

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