钱家营矿煤层气产能潜力数值模拟研究

Numerical Simulation of CBM Productivity Potential in Qianjiaying Mine

煤层气产能潜力评价是研究煤层气产出与运移规律,指导压裂增透工艺优和排采制度优化的重要方法。采用COMET 3软件对钱家营煤矿7号煤层压裂水平井的产能潜力进行了模拟研究,在储层渗透率分别为0.05mD、0.1mD和0.2mD条件下,水平段为1000m的压裂水平井单井峰值产量在4761~7012m^(3)/d;生产10年的累计产气量为(1054~1401)万m^(3)。单井生产3~4年,影响半径130m范围内的瓦斯含量平均降低2~3m^(3),可以保障现有煤层及瓦斯条件下煤矿的安全生产。数值模拟研究成果表明,钱家营煤矿7号煤层具有地面煤层气开发的潜力及可行性,压裂水平井是钱家营煤矿煤层气开发的优势技术,提高压裂后储层渗透性是提高单井产量的关键。

CBM productivity potential evaluation is an important method to study CBM production and migration law,guide the optimization of anti-reflection fracturing technology and drainage system.The productivity potential of fractured horizontal well in coal#7 of Qianjiying Coal Mine was simulated by using COMET 3 software.Under the condition of reservoir permeability of 0.05 mD,0.1 mD and 0.2 mD respectively,the peak gas production of fractured horizontal well with a horizontal section of 1000 m is 4761~7012 m^(3)/d.The cumulative gas production of 10 years is 10.54~14.01 million m^(3).A single well produces for 3~4 years,the gas content within a radius of 130 m is reduced by 2~3 m^(3)on average,which can ensure the safety of coal mine production under the existing coal seam and gas conditions.The numerical simulation results show that coal#7 in Qianjiaying Coal Mine has the potential and feasibility of surface coalbed methane development,fractured horizontal well is the dominant technology of coalbed methane development in Qianjiaying Coal Mine,and improving the permeability of fractured reservoir is the key to improve the production of single well.