煤储层渗透率气体压力敏感性的影响因素探讨

发布时间：2018-06-08 18:34

本文选题：渗透率 + 气体压力　；参考：《煤矿安全》2016年08期

【摘要】：为了探讨在煤层气排采过程中煤储层渗透率的动态演化规律,以松藻煤矿K2煤层煤样制作的型煤试件为研究对象,进行了不同应力、温度作用下煤渗透率随气体压力降低演化规律的试验研究。研究结果表明:煤的渗透率随气体压力下降基本呈现先减小后增大的趋势,渗透率最小值对应的气体压力临界值将渗透率随气体压力的演化分为2个阶段;根据气体压力敏感系数Cp定义,不同围压温度条件下气体压力敏感系数与气体压力呈现对数关系;由于有效应力与基质收缩效应2方面的影响,在初始阶段随围压及温度的升高煤渗透率对气体压力的响应程度增大,基于气体压力敏感系数建立了气体压力与渗透率的关系式,可为合理制定煤层气排采方案提供指导。
[Abstract]:In order to study the dynamic evolution law of coal reservoir permeability in the process of coal bed methane production, different stresses were carried out on the briquette specimen made from coal sample of K2 coal seam in Songzao Coal Mine. Experimental study on the evolution law of coal permeability with gas pressure under the action of temperature. The results show that the permeability of coal decreases first and then increases with the decrease of gas pressure. The critical value of gas pressure corresponding to the minimum permeability value divides the evolution of permeability with gas pressure into two stages. According to the definition of gas pressure sensitivity coefficient CP, the relationship between gas pressure sensitivity coefficient and gas pressure is logarithmic under different confining pressure temperature, due to the effect of effective stress and matrix shrinkage effect. In the initial stage, the response of coal permeability to gas pressure increases with the increase of confining pressure and temperature. Based on the gas pressure sensitivity coefficient, the relationship between gas pressure and permeability is established, which can provide guidance for the rational formulation of coal bed methane extraction scheme.
【作者单位】：瓦斯灾害监控与应急技术国家重点实验室;中煤科工集团重庆研究院有限公司;
【基金】：国家自然科学基金面上资助项目(51574280) “两江学者”计划专项经费资助项目([2013]渝九证字第1406号) 中煤科工集团重庆研究院有限公司资助项目(2015DXM14) 煤炭科学研究总院科技创新基金资助项目(2015ZYJ002)
【分类号】：TD712

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