煤层气井产能影响因素分析

煤层气的开发和利用十分重要,煤层气产能研究对合理开发煤层气具有指导意义。在煤层气理想模型基本假设基础上,建立计算产量所需的各参数的方程。结合产量计算方程和静态物质平衡方程推导出产能预测解析模型;并分析了朗格缪尔体积常数、临界解吸压力、煤层渗透率以及单井控制面积对产能的影响。结果表明朗格缪尔体积常数的大小直接影响着煤层的含气量。临界解吸压力的大小直接影响煤层甲烷解吸的时刻。煤层渗透率影响产量峰值出现的时间。单井控制面积影响产量峰值大小。

Analysis of Factors Affecting Productitity of Coalbed Gas Wells

It is vitally important to develop and utilize coalbed methane (CBM) resources nowadays. Thus, conducting a research on productivity of CBM has significant guiding role in development of CBM. Equations that are used to calculate production rate of CBM are derived on the basis of assumed ideal CBM model in this paper. Also, in combination with equations and static Material Balance Equation, the analytical model for determining CBM productivity was obtained. Additionally, influence of Langmuir volume constant, critical desorption pressure, coal bed permeability and well drainage area to productivity are analyzed in this paper as well. As the results show, value of Langmuir volume constant directly affect to gas content in coal bed. Value of critical desorption pressure influence on CBM desorption moment. Coal bed permeability and well drainage area affect to production peak moment occurrence and highest production rate respectively.