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- W2376357071 abstract "The paper takes its aim at introducing the results of our experimental study of the later water intrusion effects on the coal-mine gas desorption.As is known,in order to improve the gas extraction efficiency through gas desorption,it is necessary to increase the coal bed permeability by way of hydraulic fracturing,and,for this purpose, we have proposed and invented our own gas desorption-measuring device under the condition of external solution intrusion and conducted the related contrast experiments.The experiments suggested are totally made up of such gas adsorption balance pressure experiments, as 3.5 MPa,3.0 MPa,2.5 MPa,2.0 MPa,1.5 MPa,1.0 MPa,and the environmental pressure experiments,respectively,as 3.0 MPa,2.5 MPa,2.0 MPa,1.5 MPa,1.0 MPa,0.5 MPa, whose internal and external pressure difference lies in 0.5 MPa. Through the six group contrast experiments,we have gained the related experimental data and six groups of gas accumulation desorption contrast change curves.The analysis results show that:after the hydraulic fracture of the gas-latent coal,the external water later intrusion can not only help to greatly reduce the gas-desorbed coal quantity, but also can facilitate the end lime of gas desorption come earlier. Furthermore,provided that the internal and external pressure difference can reach 0.5 MPa,the gas desorption amount of coal after water intrusion is only 23%- 45%as compared to that without water intrusion,merely 67.5%of that was before on average.At the same time,the end time of gas desorption would come ahead about 1 h because it helps to get rid of the likely damage coming from the water in pores in forming the capillary resistance.Therefore,in evaluating whether to adopt hydraulic fracture to increase coal bed permeability and improve gas extraction efficiency,it is necessary to take into consideration the three aspects when dealing with the problem of coal bed permeability,that is,water-driving gas,water damaging effects on the gas desorption,and ways for enhancing the gas extraction efficiency. Thus,the present study is certain of its due reference worth for heightening the gas extraction efficiency via hydraulic fracture." @default.
- W2376357071 created "2016-06-24" @default.
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- W2376357071 date "2011-01-01" @default.
- W2376357071 modified "2023-10-07" @default.
- W2376357071 title "Experimental study of the later water intrusion effects on the gas desorption" @default.
- W2376357071 hasPublicationYear "2011" @default.
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