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赵可英. 页岩吸附气壁面扩散机理及现场应用[J]. 科学技术与工程, 2021, 21(4): 1362-1366.
ZHAO Ke-ying.Diffusion mechanisms and field application of absorbed gas on surface wall of nano-pores of shale[J].Science Technology and Engineering,2021,21(4):1362-1366.
页岩吸附气壁面扩散机理及现场应用
Diffusion mechanisms and field application of absorbed gas on surface wall of nano-pores of shale
投稿时间:2020-04-30  修订日期:2020-11-20
DOI:
中文关键词:  页岩气  混合气  表面扩散  实际气体效应  现场预测
英文关键词:shale gas  gas mixture  surface diffusion  real gas effect  field prediction
基金项目:国家科技重大专项“页岩气区域选区评价方法研究”(2016ZX05034002-003)
  
作者单位
赵可英 内江师范学院
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中文摘要:
      与常规天然气藏开发不同,页岩气藏无机质与有机质孔隙中的吸附气对开发的影响不可忽略。为准确表征混合气体吸附解析过程中的真实气体效应,本文建立了页岩气壁面扩散模型。将模型与现场数据结合,分析表明:吸附位点覆盖率与气藏压力呈正向关系,即随着压力升高,吸附厚度平均值增大。在现场实践中,应适当进行降压开发,维持壁面吸附气向游离气的转化;对于现场实践而言,注入二氧化碳等分子直径较小的工作气体可有效降低吸附层厚度,进而减小体相气体扩散过程中的堵塞系数,提高页岩气井产能;在矿场对气井产能的评价当中,不考虑实际气体在高压条件下的短程排斥力作用,将导致气井产能预测值偏低。
英文摘要:
      Unlike conventional gas reservoirs, the influence of adsorbed gas in inorganic and organic matter of shale on development cannot be ignored. In order to accurately characterize the real gas effect during the adsorption and desorption process, a diffusion model of shale gas was established. Combining the model with field data, it shows that the adsorption site coverage has a positive relationship with gas reservoir pressure, that is, as the pressure increases, the average adsorption thickness increases. In the field practice, decompression development should be properly carried out to maintain the conversion of adsorbed gas to free gas on the wall; For field practice, injecting working gas with small molecular diameters such as carbon dioxide can effectively reduce the thickness of the adsorption layer, thereby reducing the blockage coefficient during the diffusion of bulk gas and improving the productivity of shale gas wells; In the evaluation of gas well productivity, the short-range repulsive force of actual gas under high pressure conditions is not considered, which will lead to a low predicted value of gas well productivity.
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