寺河3~#无烟煤润湿性与产气关系

发布时间：2018-06-04 03:46

本文选题：煤层气 + 润湿性　；参考：《西安科技大学》2015年硕士论文

【摘要】：通过试验结合理论分析,对采自寺河煤矿3~#煤煤的物质组成和孔隙结构分析,在无机岩润湿性测定的基础上对煤的润湿性进行测定,采用了部分润湿剂和润湿反转剂来判定其对煤润湿性的影响。通过对镜煤、暗煤润湿性的测定初步确定了宏观煤岩组分与煤润湿性的关系;对不同含水率煤样进行CH4的等温吸附/解吸实验对含水率不同的煤样解吸特征、煤层气解吸率与采收率、热力学特征进行分析,并对寺河区块三口煤层气直井的排采曲线分段,设定煤储层水力参数,分析产水与产气之间关系,以寺河1号井排采数据为模板,讨论高阶煤地区煤层气井合理的排采工作制度。结果表明,寺河区块3~#无烟煤储层,煤岩组分呈高镜质组、低惰质组、含少量粘土矿物,孔隙度小,显微煤岩组分中镜煤较暗煤孔隙度高,原生结构煤区镜煤条带有利于甲烷的流通,暗煤条带利于甲烷吸附储集;寺河3~#煤润湿性较差,镜煤比暗煤好;6501、JFC和洗衣粉溶液作为润湿剂利于煤样对水分子的吸附,g502溶液作为润湿反转剂利于疏水;寺河3~#煤水分含量越高对甲烷吸附能力越弱;含水率越低,其理论解吸率和理论采收率越高;寺河煤层气直井的日产气量/累计产气量和日产水量/累计产水量均符合e的负指数衰减关系。模拟计算得出日产水为2.5 m3/d时产气量远远大于日产水为1.8m3/d时产气量。在煤储层添加润湿反转剂有利于脱水,提高煤储层的疏水性,防止速敏和应敏效应的同时适当加大排水强度有利于煤层气解吸与产出。
[Abstract]:Through the test combined with theoretical analysis, the material composition and pore structure analysis of 3~# coal coal mining from the Sihe coal mine are analyzed, the wettability of coal is determined on the basis of the measurement of the wettability of inorganic rock. Some wetting agent and wetting reverse agent are used to determine its influence on the wettability of coal. The wettability of dark coal is determined preliminarily through the determination of the mirror coal and the dark coal. The relationship between the macroscopic coal and rock composition and the wettability of coal, and the isothermal adsorption / desorption experiments of CH4 with different water content of coal samples, the desorption characteristics of coal samples with different water content, the thermodynamic characteristics of the desorption rate and recovery of coal bed gas, and the subsection of the production curve of the three CBM wells in the Sihe block, and the hydraulic parameters of the coal reservoir are set up. The relationship between producing water and gas production, taking the data from well 1 in well Sihe as a template, the rational drainage and mining system of coal seam gas well in high rank coal area is discussed. The results show that the 3~# anthracite reservoir in the temple area is high vitrinite, low inert mass, small amount of clay minerals, small pore space and high porosity of dark coal in microscopic coal and rock components. The primary coal zone mirror coal strip is beneficial to the circulation of methane, and the dark coal strip is beneficial to the adsorption of methane. The wettability of the 3~# coal in Sihe is poor, the mirror coal is better than the dark coal; 6501, JFC and detergent solution are used as wetting agents to adsorb the water molecules, and the g502 solution is beneficial to the hydrophobicity as a wetting reverse agent; the higher the water content of the Sihe 3~# coal is to methane The weaker the adsorption capacity, the lower the water content, the higher the theoretical desorption rate and the theoretical recovery rate, and the negative exponential attenuation relationship between the daily and cumulative gas production and the daily water yield of the vertical well in the Sihe coal seam gas well. The gas yield is far greater than that of the e when the daily water is 2.5 m3/d. Adding the wetting reverse agent to the layer is beneficial to dehydration, improve the hydrophobicity of the coal reservoir, prevent the speed sensitivity and the desensitization effect, and increase the drainage strength at the same time, which is beneficial to the desorption and production of coal bed gas.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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