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CBM Development and Utilization for Green Exploitation of Coal Mine
Lin Jianhao, Hu Aimei and Li Mingzhai
£¨China United Coalbed Methane Corp., Beijing 100011£©Abstract: In this paper, the current status of CBM development and utilization at home and abroad, national key CBM projects£¬the benefit from CBM development and utilization for coal mine safety, and the technologies adopted to improve CBM drainage efficiency are introduced.
Keywords: CBM; exploration and development; drainage technology
CMM Drainage Technology and Coal Mine Gas Control
Yuan Liang
£¨Huainan Coal Mining Group Co., Ltd., Anhui 232001£©Abstract: The co-extraction technology of coal and CMM under the complicated and difficult geological conditions in Huainan Coal Mining Area is presented. With numerical simulation, similar materials testing, commercial testing, etc., the CMM drainage technologies with the displacement and depressurization of mining coal rock, involving coal seam roof, depressurization and enhanced permeability of protective coal seam, and mining influence zone of surface drilling drainage, and the intensified CMM drainage technologies with virgin coal seam are studied, the key parameters obtained. The on-site application of the technologies is introduced in an all-round way.
Keywords£ºCMM; coal mine gas; drainage
Approaches to Issues of National CBM Resources Assessment of China
Fan Mingzhu
£¨Exploration and Production Research Institute of Sinopec, Beijing 100083£©Abstract: Sinopec¡¯s approaches to the issues emerging in the new round of national CBM resources assessment, such as the low-limit depth of CBM weathering zone, CBM mineable coefficient, and reliability of CBM geological reserves, are briefly presented, for the purpose of advancing CBM resources assessment in China.
Keywords: CBM; resources assessment; weathering zone; mineable coefficient
Current Status and Prospects of CMM Drainage Technologies in China
Wang Kuijun and Zhang Xinghua
£¨Coal Science Research Institute at Fushun, Liaoning 113001£©Abstract: The history of CMM drainage technologies in China is briefly reviewed. The new CMM drainage technologies developed in recent years are introduced. Several typical drainage methods suitable for the occurrence conditions of coal seam gas in China are detailed. The future trend of CMM drainage technologies in China is forecast¡£
Keywords: CMM; drainage technology; equipment
Experimental Evaluation on Conductivity of Hydraulic Fracturing in CBM Wells
Wang Chunpeng£¬Zhang Shicheng£¬Wang Lei£¬Tang Huaiyi and Cui weixiang
£¨Oil and Gas Engineering College of Petroleum University, Beijing 102249£©Abstract: An all-round introduction is given mainly on experimental evaluations on the conductivity of hydraulic fracture in CBM wells. Compared to sandstone, a coalbed features lower rigidity, leading to more serious proppant embedment in hydraulic fracturing and thus the descent of conductivity, which could be eased by increasing the consistence of sand filling. Since the closure pressure of coalbed is a key parameter, the experimental comparison of influence on coalbed conductivity is made under different closure pressures between the proppant crushing and embedment, consistence of sand filling and quartz sand proppant diameter. The conclusions drawn in this paper can be used to guide the future study of CBM and field performance.
Keywords: CBM; hydraulic fracturing; conductivity
Discussion on New Schemes to Utilize CMM
Jiang Xiaobing1, Zhang Xingyun1 and Xie Haiying2
£¨1£®Design Institute of Chongqing Iron & Steel Corporation, Chongqing 400080; 2£®Nanchong Oil Refining Factory, Sichuan 637000£©Abstract: CMM currently is mainly used in domestic fuel, power fuel and chemical materials. Based on the routine scheme of CMM utilization, two new schemes are put forward. By adopting Pressure Swing Adsorption (PSA) technology, CMM is condensed, the methane concentration being increased, and then processed to produce compressed natural gas (CNG) and liquefied natural gas (LNG). Taking SongZao Coal & Power Co., Ltd. as an example, the project economy of the new schemes is analyzed.
Keywords: CMM; utilization; PSA
The Status Quo and Plans on CBM Exploitation & Utilization in Shanxi Coking-Coal Mining Areas
Li Shengjun, Liang Jiaxian and Wang Jianhua
£¨Shanxi Coking Coal Group Corporation, Shanxi 030053£©Abstract: Based on detailed data, this paper introduces the CBM resources in Shanxi Coking-Coal Mining Area, ground CBM exploration and exploitation and current situation of underground gas drainage, and puts forward the plans on the exploitation and utilization of CBM in the mining area.
Keywords: Shanxi Coking-Coal Mining Area; CBM; exploitation and utilization; planning
Tectonic Characteristics of Complex Fault Block in Western Margin of Ordos Basin
and Their Control on CBM
Zhang Songhang, Tang Dazhen, Li Danmei, Wang Juanru, Xu Hao and Leng Xue
(China University of Geoscience£¬Beijing 100083)Abstract: The Ordos basin has experienced superimposing tectonic movements, resulting in the formation of current fault block aggregation which structural framework is mainly overthrust structure and complex faults, with complicated geologic condition. From the perspective of geologic evolution, this paper discusses the conformation features of fault block, emphatically demonstrates the closure property of the margin of complex fault block and the controlling of the fault block internal structure on accumulation of CBM, and points out that the synclinal and synclinorial areas of thrust fault block and structurally triangle fault block areas would be favorable for CBM occurrence.
Keywords: CBM; Ordos basin; complex fault block; tectonic control
Study and Application of Drainage Technology Using Electric Pump in CBM Wells
Ren Yuanfeng, Lv Weidong and Feng Yitang
(Underground Operation Company of North China Petroleum Administration, Hebei 065007)Abstract: Required by production from CBM wells, the conventional oil mining technology by electric pump needs to be renovated in many aspects to fit CBM wells. Through the drainage experiment by electric pump in 12 CBM wells for the last 5 years, the drainage technology by electric pump including speed governing via frequency conversion has been gradually improved, making the drainage technology by electric pump applicable for CBM wells to a great extent.
Keywords: CBM wells; electric pump; drainage
CMM Drainage and Utilization from Tucheng Mine of Panjiang Mine Area
Wang Jianzhong
£¨Liupanshui Fuel Gas Company, Guizhou 553000£©Abstract: Guizhou Province features rich coal resources with the associated CBM reserves ranking the second place in China. For the plateau and mountainous areas lacking petroleum and with inconvenient transportation, the full development and utilization of CBM resources will not only promote coal mine work safety but gain economic benefits by accessing natural gas market as well. In this paper, the CBM resources distribution and CMM drainage and utilization in Tucheng Mine are introduced.
Keywords: Tucheng Mine; CBM; utilization
Discussion on Perforation Technology in CBM Horizontal Wells
Cheng Linfeng
£¨Logging Company of Liaohe Petroleum Exploration Bureau, Liaoning 124010£©Abstract: The CBM horizontal well is a new technology in international CBM area for the recent years, which could greatly increase CBM recovery rate and contribute to coal mine gas control and CBM resources utilization. As far as coal industry is concerned, the perforation technology in CBM horizontal wells is now only at its initial stage. In this paper, the relevant experience in the perforation of oil mining is introduced, and the perforation equipments and technology applicable to CBM horizontal wells and points for attention in on-site operation are mainly discussed, for reference purpose.
Keywords: CBM well; horizontal well; perforation
Preliminary Discussion of CMM Power Generation Technology
Gao Jiong
(Huainan Coal Mining Group Co., Ltd., Anhui 232001)Abstract: In the light of CMM characteristics, the electrically controlled gas mixer is applied to make internal combustion engine suitable for CMM power generation to realize a breakthrough in gas utilization. In this paper, the key technologies, operation program and benefits analysis are introduced of the gas power generation set. The practice shows that a gas power project could achieve significant economic, environmental and social benefits, with bright prospects.
Keywords: CMM; internal combustion engine; power generation technology