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Research On Field Technology Of Determination Of Fundamental Parameters Of Methane In Qian Yingzi Coal Mine32Coal Seam

Posted on:2015-01-19Degree:MasterType:Thesis
Country:ChinaCandidate:Z F JuFull Text:PDF
GTID:2181330431991302Subject:Safety engineering
Abstract/Summary:PDF Full Text Request
Gas disaster is one of the leading factors affecting coal mine safety production, and it has become a significant problem to restrict the development of coal mines, the safe and efficient production in coal mines and the economic benefit about coal mines. Studies on gas at home and abroad, either in theory or in practice, have achieved considerable development, and have laid a theoretical and practical foundation for coal mines safety production. Basing on a large number of scholars’ achievements in the relevant field from home and abroad, with the basic theory of gas migration in coal seam and gas migration equation as the theoretical basis and the existing equipment and technology the practical basis, and in view of the actual situation of32coal seam gas occurrence of Qian Yingzi coal mine, the paper mainly includes these aspects as follows. First,32coal gas pressure determination; second,32coal seam gas content measuremen; third,32coal drilling natural gas flow attenuation coefficient and coal seam permeability determination; fourth,32coal gas effective drainage radius measurement and the last,32coal seam water injection effective wet radius measurement.Through the theoretical analysis, numerical simulation and field test three aspects of study, this thesis has obtained such following results. To begin with, this paper has accurately determined32coal mine gas pressure and content of Qian Yingzi, and measured the coefficient of drilling natural gas flow attenuation and coal seam permeability, and then the gas effective drainage radius. Then, this paper has also accurately determined the effective wet radius of32coal seam water injection. This thesis has come to the conclusions that follow. One,32coal mine absolute gas pressure of Qian Yingzi is0.3MPa, gas content2.54m3/t, drilling natural gas flow attenuation coefficient0.09742d-1, and coal seam permeability0.01205m2·MPa·-2-d·-1, which demonstrate that32coal seam of Qian Yingzi is forced drainage coal seam. Two,when the vacuum extraction of32coal seam of Qian Yingzi is16kPa, and borehole diameter75mm, the gas effective drainage radius can reach3m under a month’s continuous extraction according to the numerical simulation analysis and field test research. Three, the effective wet radius of32coal seam water injection of Qian Yingzi can reach6m under the circumstances W3227coal face of Qian Yingzi coal mine employs dynamic pressure water injection with coal wall shallow holes, and the injection pressure is lOMPa, water flow315L/min, injection time30min, water injection amount9.45m3via scientific and rational field trials.This paper mainly steps research on field technology of test of basic parameters of coal seam of32coal seam of Qian Yingzi coal mine. Through the accurate determination of basic parameters of coal seam of32coal seam of Qian Yingzi coal mine, it has provided important basis for gas accident prevention work.
Keywords/Search Tags:gas drainage, basic parameters of coal seam gas, coal seam water injection, effective wet radius
PDF Full Text Request
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