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煤层气单井开采数值模拟的研究   总被引:2,自引:0,他引:2  
对煤层气的流动机理进行了分析。结果表明 ,煤层中的甲烷气主要以吸附的方式储集在煤基质中 ,煤层割理系统提供渗流通道。煤层气在煤基质中的吸附遵循朗格缪尔等温方程 ;煤层气由煤基质向割理系统的扩散遵循Fick第一定律 ;煤层气在割理系统的流动遵循达西定律。借鉴美国现有模型 ,结合我国现场实际情况 ,建立了二维煤层气垂直井的非平衡拟稳态井底渗流数学模型。现场实例模拟计算表明 ,该模型能够用于煤层气单井数值模拟。  相似文献
2.
We studied in the laboratory the effects of acetylene (C2H2) concentrations on the accumulation and consumption of ethylene and methane in a temperate pine forest soil, and in situ ethylene and methane production and flush effects of nitrogen sources on both productions in the pine forest stand (Pinus sylvestris L.). The addition of C2H2 at concentrations more than 50 Pa C2H2 in the headspace caused a more than 95% reduction in rates of ethylene and methane consumption in forest soil compared to those with no C2H2. Furthermore, addition of acetylene within a range of 50 to 10, 000 Pa C2H2 induced a similar rate of methane accumulation in forest soil. Hence, it can be concluded that presence of more than 50 Pa C2H2 in the headspace is an effective method to measure methane production in forest soil. The addition of C2H2 at concentrations more than 50 Pa C2H2 induced an increasing concentration of ethylene in the headspace (P≤0.05), indicating the reduction of acetylene to ethylene in forest soil. Using inhibition of 0.5 kPa C2H2 in combination with 5 kPa carbon monoxide that inhibits the reduction of acetylene in a short term, it was observed that there was a larger in situ methane production rate (218±26 μg C m^-2 h^-1(μg C per square meter per hour, the same below)) than in situ ethylene production rate (92±6 μg C m^-2 h^-1) in the pine forest soil. The addition of nitrogen sources such as urea, urea plus a nitrification inhibitor dicyandiamide, and potassium nitrate, could induce a 5-fold greater increase in rates of in situ ethylene and methane production compared to those in the control, particularly in the latter (P≤0.05). The results can promote in situ measurement of ethylene and methane production in forest soils at different sites.  相似文献
3.
添加污泥对渗滤液循环垃圾填埋层甲烷产生的影响   总被引:1,自引:0,他引:1  
通过填埋模拟柱实验研究了渗滤液原液循环条件下,新鲜垃圾添加污泥(污水生物处理剩余污泥)的填埋方式对填埋层加速进入稳定的甲烷化阶段的影响.结果表明,原液循环条件下,新鲜垃圾添加好氧污泥后填埋(9∶1,湿基质量比),短期(105d)内不能加速填埋层进入稳定的甲烷化阶段;新鲜垃圾添加厌氧生物处理污泥混合后填埋(9∶1,湿基质量比),能够有效地加速填埋层进入稳定的甲烷化阶段,产甲烷滞后时间和甲烷化过程稳定时间分别为13和51d,实验期内(105d)最大产气速率、实际累积产气量分别为1.08L/kg·d和50.03L/kg(以湿垃圾为基准),其主要机理是引入了大量呈颗粒态聚集的甲烷化菌群.  相似文献
4.
根据有机地球化学、微生物学实验方法,对云南保山盆地生物气源岩进行了研究。鉴定了主要气源岩中产甲烷细菌等厌氧微生物分布,求取了不同温度下生化甲烷产率,揭示了盆地生物气生成特征,从而建立了盆地生物气生成模式和评价依据。结合盆地地质背景及有机地球化学特征,进行了盆地生物气生成量预测,指出了有利勘探区。  相似文献
5.
Change in temperature affects the activity of soil microorganisms.However,there is limited knowledge about temperature effects on ethylene(C2H4) and methane(CH4) production from forest soils.Topsoil samples(0―5 cm) collected from different temperate forest stands(e.g.,Pinus sylvestris L.,Cryptomeria japonica,and Quercus serrata) were used to compare C2H4 and CH4 production from soils at temperature from 5 to 35℃ under oxic and anoxic conditions.The rates of C2H4 and CH4 production from soils under oxic cond...  相似文献
6.
煤层气的开采影响因素有很多,其中排采方式的选择是主要因素之一,而排采方式的选择主要是指排采设备的选择。沁水盆地潘河示范区排采设备单一,效率低,从实践来看,并不特别适合现场。以潘河新区煤层气开采为例,通过对该区煤层气排采设备计算分析,结合煤层气井排采曲线,基于生产时间长,少更换泵的原则对排采设备进行了优选,形成了煤层气开采设备的优选技术。该技术对今后试验区新煤层气井开发生产及地质情况相似的柿庄南开发区的煤层气井排采设备的选择具有重要意义。  相似文献
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