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gas drainage efficiency improvement by increasing coalbed permeability using waterjet cutting system

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Journal of Coal Science & Engineering(China) 2010年第2期16卷 150-156页

作者： LU Ting-kan ZHOU Ting-yang YU Hong School of Energy Science and Engineering Henan Polytechnic University Jiaozuo 454000 China Rujigou Colliery Shenhua Ningxia Coal Group Shizuishan 750000 China Jiaozuo Coal Industry Group Co. Ltd. Henan Coal and Chemical Industry Group Co. Ltd. Jiaozuo 454000 China

This paper presented a method to create artificial fractures along the existing gas drainage borehole and increase the permeability of the coalbed using a high pressure waterjet cutting *** field work conducted in Rujigou Colliery, Shenhua Ningxia Coal Group demonstrate that the coalbed permeability is increased, and accordingly, gas drainage efficiency is improved up to 3 to 6 times over the traditional methods using high pressure waterjet ***, based on the monitoring data, the conceptual model for gas drainage process associated with different mining activities has been proposed, and few major advantages using waterjet assistance method have been identified.

关键词： permeability coalbed gas drainage waterjet Iongwalling

gas drainage from different mine of drainage systems for deep coal areas： optimal placement seams with high gas emissions

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International Journal of Coal Science & Technology 2015年第1期2卷 84-90页

作者： Ping Lu Ping Li Jian Chen Chuijin Zhang Junhua Xue Tao Yu Xi'an University of Science and Technology Xi'an 710054China Anhui Jianzhu University Hefei 230022 China Huainan Mining Group Co. Ltd. Huainan 232001 China

The techniques of stress relief mining in low-permeability coal seams and pillarless gob side retained roadway entry using Y-type ventilation and gas drainage systems were developed to control gas outbursts and applied successfully. However, as the mining depth increasing, parts of the gas drainage system are not suitable for mines with high gas emissions. Because larger mining depths cause higher ground stresses, it becomes extremely difficult to maintain long gob side roadways. The greater deformation suffered by the roadway is not favorable lor borehole drilling for continuous gas drainage. To solve these problems, Y-type ventilation and gas drainage systems installed from a roof roadway were designed for drainage optimization. This system was designed based on a gas-enrichment zone analysis developed from mining the 11-2 coal seam in the Zhuji Mine at Huainan, Anhui Province, China. The method of Y-type gas extraction from different mine areas was applied to the panel 1112（1） in the Zhuji Mine. The absolute gas emission rate was up to 116.3 m^3/min with an average flow of 69.1 m^3/min at an average drainage concentration of nearly 85 %. After the Y-type method was adopted, the concentration of gas in the return air was 0.15 %-0.64 %, averaging 0.39 % with a ventilation rate of 2100-2750 m^3/min. The gas management system proved to be efficient, and the effective gas control allowed safe production to continue .

关键词： gas drainage Different gas sources Y-type ventilation Gob side retained roadway gas emission gas-enrichment zone

Pressure relief, gas drainage and deformation effects on an overlying coal seam induced by drilling an extra-thin protective coal seam

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Mining Science and Technology 2009年第6期19卷 724-729页

作者： LIU Hai-bo CHENG Yuan-ping SONG Jian-cheng SHANG Zheng-jie WANG Liang National Engineering Research Center for Coal ＆ gas Control China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Zhengzhou Coal Industrial Group Corporation Ltd. Zhengzhou Henan 452371 China

Numerical simulations and field tests were used to investigate the changes in ground stress and deformation of, and gas flow from, a protected coal seam under which an extra-thin coal seam was drilled. The geological conditions were: 0.5 meter mining height, 18.5 meter coal seam spacing and a hard limestone/fine sandstone inter-stratum. For these conditions we conclude: 1) the overlying coal-rock mass bends and sinks without the appearance of a caving zone, and 2) the protected coal seam is in the bending zone and undergoes expansion deformation in the stress-relaxed area. The deformation was 12 mm and the relative defor- mation was 0.15%. As mining proceeds, deformation in the protected layer begins as compression, then becomes a rapid expansion and, finally, reaches a stable value. A large number of bed separation crannies are created in the stress-relaxed area and the permeability coefficient of the coal seam was increased 403 fold. Grid penetration boreholes were evenly drilled toward the protected coal seam to affect pressure relief and gas drainage. This made the gas pressure decrease from 0.75 to 0.15 MPa, the gas content decrease from 13 to 4.66 m3/t and the gas drainage reach 64%.

关键词： extra-thin protective coal seam drilling pressure relief expansion deformation gas drainage

gas drainage technology of high gas and thick coal seam

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Journal of Coal Science & Engineering(China) 2009年第3期15卷 299-303页

作者： HE Tian-cai LI Hai-gui ZHANG Hai-jun Jincheng Mining Group Co. Ltd. Jincheng 048006 China

gas drainage in Jincheng Mining Group Co.,*** introduced briefly and theimportance of gas drainage in gas control was *** with coal-bed gas occurrenceand gas emission,the double system of gas drainage was optimized and a progressivegas drainage model was experimented *** guaranteed drainage,excavationand mining and realization of safety production and reasonable exploitation of gas in coalseams,many drainage methods were adopted to solve the gas problem of the workingface.

关键词： gas drainage thick coal seam

Fracture evolution and pressure relief gas drainage from distant protected coal seams under an extremely thick key stratum

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Journal of China University of Mining and Technology 2008年第2期18卷 182-186页

作者： WANG Liang CHENG Yuan-ping LI Feng-rong WANG Hai-feng LIU Hai-bo National Engineering Research Center for Coal ＆ gas control China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Haizi Coal Mine Huaibei Mining Industry Group Huaibei Anhui 235000 China

When an extremely thick rock bed exists above a protected coal seam in the bending zone given the condition of a mining protective seam, this extremely thick rock bed controls the movement of the entire overlying stratum. This extremely thick rock bed, called a ＂main key stratum＂, will not subside nor break for a long time, causing lower fractures and bed separations not to close and gas can migrate to the bed separation areas along the fractures. These bed separations become gas enrichment areas. By analyzing the rule of fracture evolution and gas migration under the main key stratum after the deep protective coal seam has been mined, we propose a new gas drainage method which uses bore holes, drilled through rock and coal seams at great depths for draining pressure relief gas. In this method, the bores are located at a high level suction roadway （we can also drill them in the drilling field located high in an air gateway）. Given the practice in the Haizi mine, the gas drainage rate can reach 73% in the middie coal group, with a gas drainage radius over 100 m.

关键词： extremely thick key stratum protective seam exploitation fracture evolution gas drainage distant borehole drilling

Fissure evolution and evaluation of pressure-relief gas drainage in the exploitation of super-remote protected seams

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Mining Science and Technology 2010年第2期20卷 178-182页

作者： LIU, Hongyong CHENG, Yuanping ZHOU, Hongxing WANG, Feng CHEN, Haidong national engineering and research center for coal gas control china university mining & technologyxuzhou 221008china

Based on nonlinearity contact theory and the geological structure of the Xieqiao Coal Mine in the newly developed Huainan coal field,rock movements,mining fissures and deformation of overlying strata were simulated by using the interface unit of FLAC3D to evaluate the pressure-relief gas drainage in the exploitation of super-remote protected *** simulation indicates that the height of the water flowing fractured zone is 54 m in the overlying strata above the protective *** maximum relative swelling deformation of the C13 coal seam is 0.232%,while the mining height is 3.0 m and the distance from the B8 roof to the C13 floor is 129 m,which provides good agreement with a similar experiment and in situ *** feasibility of exploitation of a super-remote protective coal seam and the performance of the pressure-relief gas drainage in a super-remote protected layer are evaluated by comparisons with practice *** demonstrates that the relieved gas in the super-remote protected layers could be better drained and it is feasible to exploit the B8 coal seam before the C13 super-remote protected coal *** method is applicable for the study of rock movements,mining fissures and deformation of the overburden,using the interface unit to analyze the contact problems in coal mines.

关键词： protected layers super remote contact analysis gas drainage numerical simulation

gas-solid coupling analysis and numerical simulation of the dynamic process of gas drainage

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Journal of Coal Science & Engineering(China) 2013年第2期19卷 187-192页

作者： Kai WANG Bo LI Jian-Ping WEI Peng LI Faculty of Resources and Safety Engineering China University of Mining and Technology (Beijing) Beijing 100083 China Key Lab of gas Geology and gas Control Henan Polytechnic University Jiaozuo 454000 China

Based on the basic theory of gas seepage and coal seam deformation, using the numerical simulation method, this paper established the gas-solid coupling model of gas drainage from borehole. Using multi-physical coupling analysis software, the authors studied the stress change conditions around the drainage borehole, the influence of the gas drainage effect caused by the drilling gap, and the gas drainage effect under the conditions of different borehole radius and different permeabilities. The results show that the effective drainage radius is 1.03 m during 30 days of drainage. The effect of the diameter change of the drainage borehole is limited, but the influence of coal seam permeability is much bigger. After the same drainage period, the greater the permeability of coal seam is, the bigger the drainage radius is. For a low permeability coal seam, coal miners should take pressure-relief measures and increase the permeability to improve the drainage effects before draining gas through drilling.

关键词： gas drainage numerical simulation drainage radius stress gas-solid coupling

Technology of gas drainage and utilization in Huaibei mining area

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Journal of Coal Science & Engineering(China) 2009年第3期15卷 278-283页

作者： LI Wei XU Rui Huaibei Mining （Group） Co. Ltd. Huaibei 235000 China

With the characteristics of coal seam geology and gas occurrence,a'ground-underground' integrated gas drainage method was formed,which can relieve gaspressure and increase permeability by mining the protection seams in conditional *** coal seam gas drainage,high gas outburst seam was converted to low gas *** the coal face mining process,safety and high efficient coal mining were realizedby the measure of gas-suction over *** addition to the drainage gas for civil gasand gas power generation,the Huaibei Mining Group has actively carried out research onthe utilization technology of methane drainage by *** the one hand,it can saveprecious energy;on the other hand,it can protect the environment for people's ***2007,the amount of coal mine gas drainage was 120 hm3;the rate of coal mine gasdrainage was 44%.Compared with the year 2002,the amount of coal mine gas drainageincreased by two ***,the utilization rate of gas increased rapidly.

关键词： gas drainage gas utilization Huaibei mining area

Comparative experiments of gas drainage in different types of drillings

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Journal of Coal Science & Engineering(China) 2012年第2期18卷 129-133页

作者： LI Cheng-wu WEI Shan-yang WANG Chuan GAO Tian-bao FU Yu-kai School of Resources&Safety Engineering China University of Mining&Technology(Beijing)Beijing 100083China

gas drainage effect is the utmost important factor for mining speed and mining safety. It has great meaning to study the effect of gas drainage. Comparative experiment of gas drainage in different types of drillings shows that the initial rate of gas natural emission by hydraulic loosed cross drilling is 1.5 times more than that of parallel drilling, and the drilling gas at- tenuation coefficients reduces to 0.78 times, the effect of gas drainage is good. The ultimate quantity of gas drainage of parallel drilling, cross drilling, hydraulic loosed cross drilling are 859.1, 1 323.5 and 1 833.6 m3/100 m. The results of the measurement through these three kinds of drillings of 100 meters drilling is considered as following： cross drilling is 1.54 times more than that of parallel drillings, hydraulic loosed cross drilling are 2.13 times more than parallel drilling. The drainage rate of parallel drilling, cross drilling and hydraulic loosed cross drilling reached 10% to 15% in 3 months with the pre-draining time. Among these, the drainage effect of hydraulic loosed cross drilling increased by 46% than that of parallel drilling in three months.

关键词： gas drainage cross drilling hydraulic looseness