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首页> 外文期刊>Fuel >Flow transportation inside shale samples during low temperature combustion: The effect of desorption and pyrolysis
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Flow transportation inside shale samples during low temperature combustion: The effect of desorption and pyrolysis

机译：页岩样品在低温燃烧过程中的流动传输：解吸和热解的影响

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摘要

Flow transportation inside shale formations is a complex process mainly including slip flow, transition flow, and free molecular diffusion. Recently, using combustion to promote gas transportation inside shale formations for gas extraction has been studied. In this study, the shale samples were combusted at 280 degrees C and 400 degrees C respectively, to obtain transient pressure variation behaviors inside the shale samples. The effects of organic matter pyrolysis and adsorbed gas desorption on internal flow transportation were investigated. Moreover, a mathematic scaling power law was used to predict the pressure rising and declining processes. It was found that the pressure exhibited similar trend under 280 degrees C and 400 degrees C. Shale internal pressure built up quickly and reached peak value after combustion began. Then the pressure declined close to ambient pressure within a short period. Under 400 degrees C, the pressure of inner and outer holes were close to each other; the peak pressure could rise up to 7000 Pa. Both the gas generated from the thermal cracking of kerogen and gas desorbed from the pore surface contributed to pressure rising. However, at lower combustion temperature (280 degrees C), the rising of the pressure is mainly owing to the desorption gas from the surface to the pore volume. The peak pressure was only 780 Pa, much lower than that under 400 degrees C. By selecting an appropriate exponential m in the power law of scaling pressure, pressure rising and declining processes inside shale samples could be well simulated.
机译：页岩地层内部的流体输送是一个复杂的过程，主要包括滑流，过渡流和自由分子扩散。最近，已经研究了利用燃烧促进页岩地层内部的气体输送以进行气体提取。在这项研究中，页岩样品分别在280℃和400℃下燃烧，以获得页岩样品内部的瞬时压力变化行为。研究了有机物热解和吸附气体解吸对内部流传输的影响。此外，数学定标幂定律被用来预测压力上升和下降的过程。发现在280℃和400℃下压力表现出相似的趋势。页岩内部压力迅速建立并在燃烧开始后达到峰值。然后压力在短时间内下降到接近环境压力。在400摄氏度以下，内孔和外孔的压力彼此接近；峰值压力可能会上升到7000 Pa。干酪根的热裂化产生的气体和从孔隙表面解吸的气体都有助于压力上升。然而，在较低的燃烧温度（280摄氏度）下，压力的升高主要是由于从表面到孔隙体积的解吸气体所致。峰值压力仅为780 Pa，远低于400摄氏度下的峰值压力。通过在定标压力的幂律中选择适当的指数m，可以很好地模拟页岩样品内部的压力上升和下降过程。

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  • 来源
    《Fuel》 |2019年第15期|77-83|共7页
  • 作者

    Chen Wei; Yang Jiajin; Chen Yilin; Lei Yafeng; Sun Jiafeng; Wang Tengxi;

  • 作者单位

    Soochow Univ, Sch Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Sch Energy, Suzhou 215006, Peoples R China;

    China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China;

    Texas A&M Univ, Dept Mech Engn, College Stn, TX 77840 USA;

    Texas A&M Univ, Dept Mech Engn, College Stn, TX 77840 USA;

    Texas A&M Univ, Dept Mech Engn, College Stn, TX 77840 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Shale; Combustion; Kerogen; Scaling; Permeability;

    机译：页岩;燃烧;干酪根;结垢;渗透率;

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