煤层气井压裂对井下瓦斯抽采量与涌出浓度影响研究
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摘要
为了确保煤矿安全、高效生产,采用地面煤层气井水力压裂增透工艺提高煤层透气性,通过利用嵌入式人工裂缝实时监测技术对煤层气井压裂所产生的裂缝形态、压裂有效半径进行了实时监测评价,考察了S2205胶带巷24个钻场瓦斯抽采量,结果显示:压裂区较未压裂区提高了2~4倍,但压裂提高瓦斯抽采量的同时也导致了钻场瓦斯涌出浓度的增加。
In order to ensure the mine safety and high- efficiency production,the hydraulic fracturing and permeability improving technology of the coal bed methane well at the surface ground was applied to improve the permeability of the seam.The real time monitoring and measuring technology of the insetted type artificial fractures was applied to the real time monitoring and measuring evaluation on the fracture patterns occurred by the pressurized fracturing of the coal bed methane well and the effective fracture radius.The gas drainage quantities of 24 drilling fields in the S2205 belt conveyor gateway were investigated.The results showed that in comparison with the non fracturing area,the gas drainage quantity in the pressurized fracturing area would be increased by 2 ~ 4 times.The fracturing would not only increase the gas drainage quantity,but could make the gas emission concentration in the drilling field increased.
In order to ensure the mine safety and high- efficiency production,the hydraulic fracturing and permeability improving technology of the coal bed methane well at the surface ground was applied to improve the permeability of the seam.The real time monitoring and measuring technology of the insetted type artificial fractures was applied to the real time monitoring and measuring evaluation on the fracture patterns occurred by the pressurized fracturing of the coal bed methane well and the effective fracture radius.The gas drainage quantities of 24 drilling fields in the S2205 belt conveyor gateway were investigated.The results showed that in comparison with the non fracturing area,the gas drainage quantity in the pressurized fracturing area would be increased by 2 ~ 4 times.The fracturing would not only increase the gas drainage quantity,but could make the gas emission concentration in the drilling field increased.
引文
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