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Situation and Tasks of Coal Mine Gas Prevention and Control in China
Chen Guoxin
(State Administration of Coal Mine Safety, Beijing 100713)
Abstract£ºThe paper describes the situation of mine safety from the viewpoint of gas control. It studies in details some existing probelems in gas control. It also proposed the targets and counter-measures for control of coal mine gas in a period of time in the future.
Keywords£ºCMM£»gas control£»major problems£»targets and counter-measures
Current Status of Development and Utilization of Coal Mine Methane in Australia and Cooperation Prospect of Sino-Australia
Sun Xin, Liu Wenge and Sun Qinggang
(China Coal Information Institute, Beijing 100029)Abstract: Australia has abundant coal and CBM reserves. It is in a leading position in development and utilization of CBM in the world. The paper describes CBM reserves, development and utilization technologies and current situation of development of CBM projects in Australia as well as prospect of cooperation in the domain of CBM between Australia and China
Keywords: Australia, CBM, development and utilization
A Method for Computation of Gas Production from CBM Vertical Fracturing and Horizontal Wells
Lu Changsheng
(Greka Energy Co., Beijing 100873)Abstract: The paper introduces a method for calculating gas production from a vertical fracturing well or a horizontal well by setting up a hydraulic model. A formula for calculating gas production and other parameters is deduced from the model for quantitative computation by introduction of some concrete strata parameters, fluid characteristics, and adsorption characteristic data of coal seam.
Keywords: CBM£»vertical well£»horizontal well£»hydraulic model£»gas production
Theory and Practice of Integrated Coal Mining and Gas Extraction
Zhang Suian
(Coalbed Methane Research Center of China University of Petroleum, Beijing 102249)Abstract£ºThe paper involves in formation and development of the concept of integrated coal mining and gas extraction. It describes the connotation and denotation of integrated coal mining and gas extraction. It expounds in details the techniques for achieving co-extraction of coal and gas. It proposes recommendations on closely coordinated coal mining and CBM extraction in the future.
Keywords: CBM£»integrated coal mining and gas extraction£»coal mine safety
Potentials of CBM Resources in Key Mine Areas in China and Some
Theoretical Problems in Resources Evaluation
Qin Yong, Sang Shuxun, Fu Xuehai, Zhu Yanming, Wei Chongtao, Yang Yongguo and Wu Caifang
(Resources and Earth Science College of China University of Mining £¦ Technology, Xuzhou 221008)Abstract£ºA methodology system suitable for evaluation of the characteristics of CBM resources and their potentials in coal mine areas was established based on investigation of 22 key mine areas in a new round of national oil and gas evaluation. The distribution characteristics of CBM resources of the relevant mine areas and active mines were basically make clear. The present status and prospect for development and utilization of CBM were studied. Recommendations on selection of CBM development modes for different mine areas were preliminarily proposed. The paper described some research results in CBM resources in related mine areas, potentials for development and recommendations on development. Based on it, some key theoretical problems met in the practice of evaluation were also discussed.
Keywords: CBM resources£»mode of development£»theory for assessment
Discussion on Use of CMM to Produce Hydrogen
Tao Pengwan and Gu Gongwei
(Southwest Research & Design Institute of Chemical Industry, Sichuan 610225)Abstract£ºThe paper introduces the relevant technologies for producing hydrogen from the drained underground CMM with a methane concentration from 30% to 60%. It describes the influences of all the parameters on technological conditions of auto-thermal reforming in hydrogen production. Hydrogen production from CMM provides a new approach for utilization of CMM.
Keywords: CBM£»hydrogen making£»technology
Practice of Gas Control in Drivage of Roadways in Mine Construction
Li Rendong 1,2
(1. Resources College, China University of Mining, Jiansu,Xuzhou 221008£¬
2. Yankuang Guizhou Nenghua Co. Ltd. Guiyang, Guizhou 550003)Abstract: Qinglong coal mine has a number of workable coal seams containing high concentration of gas. Gas emission in the roadway drivage always exceeds the limit. As a result of repeated experiments and research, pre-drainage was adopted by drilling boreholes from drilling sites on both sides of the roadway. The problem with excessive gas emission in the roadway drivage was solved, which accelerated the speed of roadway drivage.
Keywords: Heading face£»drilling site£»boreholes for gas drainage
Results of CBM Testing and Remoulding of Reservoir in Eastern Yunnan and Western Guizhou
and Related Problems & Suggestions
Meng Xianwu, Liu Shirong, Shi Guoshan, Zhu Lan and Feng Xia
(Guiyang Branch of Prospecting and Research Institute of Sinopec Southwestern Branch Company, Guiyang, Guizhou 550004)Abstract: Based on an overall investigation of a great quantity of CBM information obtained in the research and exploration in the first phase in eastern Yunnan and western Guizhou, and on large amount of CBM information obtained in exploration, research and development at home and abroad, we have achieved a lot of important results in all aspect of work, especially we have obtained new knowledge on CBM reservoir mechanism and output mechanism, which has provided plenty of data for the research of CBM in eastern Yunnan and western Guizhou. However, we also found many important problems in the preparation period, for example, testing and remoulding of reservoir. We need to attach more importance to these problems and find out solutions to these problems.
Keywords: Eastern Yunnan and western Guizhou£»CBM£»testing and remoulding of reservoir
Review and Prospect of Research on Stable Carbon Isotope of CBM
Duan Lijiang, Tang Shuheng and Zhu Baocun
(Beijing Energy Resources College of China University of Geosciences, Beijing, 100083)Abstract: The research of stable isotope plays an important role in the study of conventional natural gas. The paper studies the current state of research work in the following aspects: the controlling and influencing factors of methane carbon isotope, geochemistry and the genetic type of coalbed methane isotope, cause of low ¦Ä13C value of the coalbed methane, etc. It is considered that in the future research efforts should concentrate on effects of adsorption¨Cdesorption characteristcs of coalbed on carbon isotope fractionation based on the features of coal reservoir.
Keywords£ºCoalbed methane£»stable carbon isotope£»adsorption-desorption£»fractionation
Experimental Study on PSA for Low Quality Coal Mine Methane Separation and Purification
Chang Xinjie£¬Liu Yingshu£¬Liu Wenhai, Zhang Hui and Yue Kai
(Gas Separation Research Institute of the Mechanical Engineering College of Beijing University of Science and Technology, Beijing 100083)Abstract: The paper discusses the research related to separation and purification of low concentration gas by pressure swing adsorption (PSA) method. The effects of switching time and resistance of reverse purging on separation were studied on a twin-tower PSA unit. The results indicated that PSA method could achieve separation and purification of low concentration gas and reverse purging process could increase the quantity of gas and ensure the separation effect as well.
Key words: Pressure Swing Adsorption (PSA)£»gas separation£»top corner£»activated carbon
Preliminary Study on Differences between CBM Well Testing and Conventional Oil
and Gas Well Testing
Chen Yanli1, Liu Qiguo1, Zhang Liehui1 and Wang Wei2
(1. Oil & Gas Reservoir Geology and Development Engineering State Key Laboratory, Southwest Petroleum University, Chendu, Sichuan 610500£»2. Huazhong University of Science and Technology, Wuhan, Hebei 430074)Abstract: The paper discusses briefly the differences between testing of CBM well and the conventional oil and gas well in aspects of well testing objects, petrographical structure, level of extraction, well test model and analysis methods of well testing results.
Keywords: CBM well£»oil and gas well£»well testing