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Vol.2 No.2 Main Contents
Enhance Gas Drainage and Utilization to Promote Work Safety of Coal Mines¡¡¡¡ ¡¡Zhao Tiechui.
Zero Emission of Coal Mine Methane in Chin¡¡¡¡ Liu Wenge, et al. Directional Drilling for Methane Drainage in Advance of Mining Daniel J. Brunner, et al. Application of Thermal Well Logging in Fracture Monitoring of Coal-Seam Hydraulic Fracturing Li Yukui, et al. CBM Development and Utilization and Its Near-Term Targets in Jincheng Li Guishan. Flow Problems of Coalbed Methane through Bounded Confirming Stratum Liu Shan,al et. Risk Management of CBM Project in Operation Tian Yongdong. Potential of Horizontal Mine Gas Drainage for Underground Hard Coal Mining Michael Schloenbach. Experiments on In-Seam Long-Borehole Directional Drilling Technology Wu Zhang, al et. Prospects of Coalbed Methane Exploration in Hegang Wei Chen,et al. Combustion Technologies and Equipments of Coalbed Methane Yu Shihang. Enhance Gas Drainage and Utilization to Promote Work Safety of Coal Mines
Zhao Tiechui
(State Administration of Coal Mine Safety, Beijing 100713)Abstract: The importance of gas drainage and utilization in work safety of coal mines and the factors influencing gas drainage and utilization in Chinese collieries are elaborated. It is put forward that the greater policy support is necessary to fully step up comprehensive utilization of coal mine methane and improve work safety of coal mines.
Keywords: coal mine methane; drainage and utilization; work safety
Zero Emission of Coal Mine Methane in China
Liu Wenge, Zhang Binchuan, Liu Xin, Sun Qinggang and Dou Xiaodong
(China Coalbed Methane Clearinghouse of China Coal Information Institute, Beijing 100029)Abstract: The current situation of emission of coal mine methane in China is introduced. The strategies and technologies to realize zero emission of coal mine methane and existing barriers and difficulties are elaborated. The possibility is indicated to realize zero emission of coal mine methane in part of China's collieries.
Keywords: coal mine methane; zero emission; drainage and utilization
Directional Drilling for Methane Drainage in Advance of Mining
Daniel J. Brunner and Jeffrey J. Schwoebel
(REI Drilling, Inc., USA 84107)Abstract: The latest progress in the directional drilling system and its various applications including in-seam methane drainage, gob gas drainage, coalbed methane commercial recovery, etc. are presented. All of the directional drilling applications described here are carried out by REI Drilling, Inc.
Keywords: methane; drainage; exploration; directional drilling
Application of Thermal Well Logging in Fracture Monitoring of Coal-Seam Hydraulic Fracturing
Li Yukui1 and Zhang Suian2
(1. Underground Special Operation Department of Zhongyuan Petroleum Exploration Bureau, Henan 457061; 2. China University of Petroleum, Beijing 102249)Abstract: The experiments were carried out on thermal well logging before and after hydraulic fracturing and on thermal well logging with water injection after hydraulic fracturing. A method was developed to determine the fracture height of coal seam hydraulic fracturing by thermal well logging, making it possible to properly evaluate the effect of coal seam hydraulic fracturing in a scientific way.
Keywords: coalbed methane; thermal well logging; hydraulic fracturing; fracture monitoring
CBM Development and Utilization and Its Near-Term Targets in Jincheng Anthracite Mining Group
Li Guishan
£¨Coalbed Methane Co., Ltd. of Jincheng Anthracite Group Co., Ltd., Shanxi 048006£©Abstract: The history of development and utilization of coalbed methane in Jincheng Anthracite Group is reviewed, the direction and market of development and utilization of coalbed methane are analyzed, and the near-term targets and development prospects are detailed.
Keywords: coalbed methane; development history; near-term targets
Flow Problems of Coalbed Gas through Bounded Confining Stratum
Liu Shan and Tong Dengke
(University of Petroleum (East China), Shandong 257061)Abstract: In this paper, pressure behavior characteristics for the flow problems of coal bed gas in bounded confining stratum are studied. The new mathematical models of the pseudo-steady and unsteady state flow problems with deformed double porosities are built by introducing the permeability module. The numerical solutions for pseudo-steady state flow models are obtained by the direct implicit differential method and Newtonian iterative method, while the numerical solutions for unsteady state flow models are obtained by the regular perturbation method and Laplace transform with the zero order perturbation solutions obtained by the Laplace numerical inversion. The rules of pressure change are discussed when the deformation parameters and double porosities parameters change in the models, and the typical pressure curves under several different conditions are plotted, which provide theoretical bases and well testing methods for oilfield development.
Keywords: coal seams with double porosities; deformed media; numerical solution; nonlinear; well testing analysis
Risk Management of CBM Project in Operation
Tian Yongdong
(Jincheng Anthracite Group Co., Ltd., Shanxi 048006)Abstract: The main risk factors during the operation of CBM project are identified in a comprehensive and systematic way. The in-depth analyses on risk factors are made from various perspectives, with the quantitative evaluation made on part of risk factors. In the light of the actual operation of CBM project, the coping strategies and monitoring measures are suggested. It is indicated that the current risk level is high for the operation of CBM project, and therefore the CBM well management and CBM market development need to be strengthened in order to lower the risk and improve the profitability of CBM project.
Keywords: CBM Project; operation; risk management
Potential of Horizontal Mine Gas Drainage for Underground Hard Coal Mining
Michael Schloenbach
( Dring Engineering GmbH, GER)Abstract: One topic of high- performance underground hard coal production gaining increasing importance is that of efficient gas removal. The article compares the drainage potential of horizontal and diagonal wells and describes main criteria for the planning of horizontal directionally drilled wells.
Keywords: gas drainage; horizontal mine; drilling
Experiments on In-Seam Long-Borehole Directional Drilling Technology
Wu Zhang, Sun Rongjun and Han Shizhou
(Drilling Research Department of Xi'an Branch of China Coal Research Institute, Shaanxi 710045)
Abstract: The site test and analysis on in-seam long-borehole directional drilling technology were carried out, by which the construction equipments and methods involved were elaborated and therefore a reliable basis was provided for spreading and applying this technology under similar geological conditions in China.
Keywords: In-seam long-borehole; gas pre-drainage; directional drilling
Prospects of Coalbed Methane Exploration in Hegang
Wei Chen, Zhang Hongfei, Ji Yufu and Jiang Chengcai
£¨No. 204 Exploration Team of Heilongjiang Coal Geology Bureau, Heilongjiang 154600£©Abstract: The theoretical analysis and discussion on three CBM parameter wells under construction in Hegang Mining Area, especially on Well No. 3 for its drilling, logging, testing and natural desorption, are made, which fully demonstrates that Hegang Mining Area possesses a large amount of CBM resources. It is suggested that the future construction of CBM wells in Hegang Mining Area focus on several CBM-rich mines such as Nanshan, Xinyi and Niaoshan Mine.
Keywords: Coalbed methane; Exploration; Parameter well
Combustion Technologies and Equipments of Coalbed Methane
Yu Shihang
£¨Shenyang Tuofeng Combustion Engineering and Technique Research Center, Shenyang 110034£©Abstract: The combustion theory related to coalbed methane is introduced. The experience in engineering application of combustion equipments is summarized. It is indicated that the special combustion equipments should be used for coalbed methane combustion. The application of combustion equipments with coalbed methane as the fuel in the industrial boiler, exhaust gas burner, and heating furnace is discussed.
Keywords: coalbed methane; low calorific value; combustion
