基于计算机断层成像技术的煤层灌浆密封减渗评价

IF 5.5 0 ENERGY & FUELS
Xiangyun Su , Dongyang Han , Fan Wu , Yueping Qin , Shibin Wang
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引用次数: 0

摘要

通过注浆封堵煤层孔隙裂缝是提高瓦斯抽采效率的关键。在这项工作中,我们通过注浆试验、x射线计算机断层扫描(CT)实验和三维(3D)模型重建等综合方法来研究超细水泥浆对减缓钻井漏气的影响。建立孔隙网络模型,分析孔隙尺寸分布、孔隙度、连通性和分形维数。通过灌浆前后渗透参数的变化,定量评价了灌浆前后的密封效果。结果表明:(1)颗粒中值直径为3.22 μm的超细水泥能有效减少漏风;注浆明显减小了孔隙和裂缝的尺寸,水泥浆在封堵裂缝中起着关键作用。(ii)注浆后煤的孔隙半径、孔隙度、连通性等参数明显降低。不同区域的连通孔隙度分别降低0.57%、1.96%、1.09%和4.72%。(iii)灌浆后4种模型的渗透率分别降低62.38%、62.56%、59.93%和71.07%。本研究旨在为钻井抽气注浆密封工程试验提供依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of sealing and permeability reduction during coal seam grouting based on computed tomography imaging technique
Sealing pores and fractures in coal seams through grouting is essential for improving gas extraction efficiency. In this work, we conducted a comprehensive approach involving grouting tests, X-ray computed tomography (CT) scanning experiments, and three-dimensional (3D) model reconstruction to investigate the impact of ultrafine cement slurry on the mitigation of drilling air leakage. Pore network models were constructed to analyze the pore size distribution, porosity, connectivity, and fractal dimension. The sealing effect was quantitatively evaluated by the variation of permeability parameters before and after grouting. The results show that: (i) The ultrafine cement with a particle median diameter of 3.22 μm effectively reduces air leakage. Grouting distinctly decreases the sizes of pores and fractures, with the cement slurry playing a key role in sealing fractures. (ii) After grouting, parameters including pore radius, porosity, and connectivity of coal distinctly decreased. The connected porosity in different regions is reduced by 0.57 %, 1.96 %, 1.09 %, and 4.72 %, respectively. (iii) The permeability of the four models decreased by 62.38 %, 62.56 %, 59.93 %, and 71.07 % after grouting, respectively. This research aims to provide a foundation for the grouting sealing engineering test of drilling gas extraction.
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