贵州松河井田煤层气地面抽采潜力分析

    Potential Analysis of Coalbed Methane Drainage in Guizhou Songhe Coal Mine

    • 摘要: 根据煤炭及煤层气勘查数据,分析了松河井田煤层气开发地质、煤储层渗透性和含气性条件,估算了煤层气资源量,并结合松6井工程开发效果,综合评价了该区煤层气地面抽采潜力。结果表明:松河井田煤层气赋存及保存条件好,薄-中厚煤层群发育,且煤层埋深、煤体结构、渗透性及含气性相对较好,埋深对煤层含气量控制作用明显,300~400 m为含气梯度转折深度,煤层气资源量达66.96×108 m3;松6井采用“多段合层压裂、合层排采”工艺,实现单井单压裂段产气量长期超过1 000 m3/d的突破,但产气量波动较大,建议加强合层排采层间矛盾问题研究;鉴于该区地形、交通及地质条件的制约,建议采用“地面丛式井钻井、多段合层压裂”开发方式。

       

      Abstract: Based on the data of coal and CBM exploitation, we analyzed the geology of CBM exploitation, permeability and gas content of coal reservoir stratum in detail in Songhe Coal Mine, and estimated the CBM resources, and comprehensively evaluated the CBM surface drainage potential of this area. We revealed that Songhe Coal Mine has a good preservative condition of CBM. Coal seams in this area present the characteristics of thin thickness and multi-seam group. The burial depth of coal-bed, coal structure, permeability and gas content are relatively well. The burial depth of coal-bed had a obvious control on gas content of coal-bed, and the abrupt gradient depth of gas contenting is 300 m to 400 m, the CBM resource is as high as 66.96×108 m3. The No. 6 well in Songhe Coal Mine adopted the technology of "multistage co-layer fracturing and co-layer drainage"; the gas production of single fracture zone in single well is over 1 000 m3/d for long term by using these technologies, while the gas production fluctuated obviously, therefore, strengthening the research of interlayer problems of co-layer drainage was suggested. Due to the limitation of the topography, transportation and geological conditions in this area, a development mode with "surface cluster wells drilling and multistage co-layer fracturing" was provided for the development of this area.

       

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