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Production Characteristics and the Control Factors of Surface Wells for relieved methane Drainage in the Huainan Mining Area

引用

Acta Geologica Sinica(English Edition) 2011年第4期85卷 932-941页

作者： XU Hongjie SANG Shuxun FANG Liangcai HUANG Huazhou School of Resources and Geoscience China University of Mining and TechnologyKey laboratory of CBM Resource and Reservoir-Generating ProcessesChina Ministry of EducationXuzhou 221008China Huainan Mining Group Huainan 232001China

Based on the production data of a large number of surface drainage wells in the Huainan mining area,the present study shows that four types of typical production characteristics for relieved methane wells are recognized,of which the stable type for production and gas concentration is the most dominate,as determined by a comprehensive study on the volume and concentration of drained gases, as well as the stress changes of rocks influenced by *** influence factors for the productive differences of the drainage wells were also been *** results indicate that protective coal-seam mining has a significant effect on overlying strata,which promotes the development of pores and fractures of coal reservoirs for methane desorption and migration;however,the production and the stability of drainage wells are affected by deformation and damage of the overlying *** second distribution of strata stress is caused by mining engineering,and if the stress load is larger than the carrying capacity of the extraction well,the gas production would be influenced by the drainage well that has been damaged by rock ***,the case damage occurs first in the weak, lithologic interface by its special mechanical *** stability of drainage wells and the production status are also influenced by the different drilling techniques,uneven distribution of gas concentration,and combination of gob gas and methane from the protected layer.

关键词： relieved methane surface drainage well Huainan mining area production characteristic control factor

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