Research on the technology of high efficient to drainage CBM by multistage fracturing in horizontal well along the roof of broken soft and low permeability coal seam
Received date: 2017-08-16
Revised date: 2017-10-27
Online published: 2017-12-10
Broken soft and low permeability coal seam,with high gas content,high gas pressure,grant resource potential,and low mechanical strength,developed well in China.Formation of hole along the coal seam drilling is difficult,and the key science and technology problem in CBM efficient development and the mine gas control of this coal seam area have always been difficult to extract gas.No.8 coal seam of Luling coal mine is in broken soft,high gas,outburst,low permeability,difficult extraction,easy drill ability of roof.Introducing horizontal well and multistage fracturing techniques,constructing horizontal well along the coal seam roof,using a complete set of developing techniques: pumping bridge plug multistage,multistage clustering directional perforation,piecewise directional fracturing step by step,and adopting the sand technologies of first low to high,first coarse to fine,applying slug-style sand technology duly,multiple sets of north-east main vertical fracture belts with high seepage ability were formed in the coal seam.Through fine drainage management technology,the horizontal well creates a record that daily CBM production is more than ten thousand cubic meters.The successful application of multistage fracturing in horizontal well along the roof of broken soft and low permeability coal seam,breaking through the concept that “structure coal is forbidden zone to develop CBM”,filling the techniques gap in surface CBM efficient development and coal mine gas control of difficult extracting coal seams area.
Jia Jian-cheng,Chen Chen,Dong Kui,Wu Yan,Wu Min-jie . Research on the technology of high efficient to drainage CBM by multistage fracturing in horizontal well along the roof of broken soft and low permeability coal seam[J]. Natural Gas Geoscience, 2017 , 28(12) : 1873 -1881 . DOI: 10.11764/j.issn.1672-1926.2017.11.014
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