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《Oil Drilling & Production Technology》 2010-04
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Study on drilling and extraction technologies for U-shape CBM wells

XIAN Baoan1,2,XIA Bairu1,ZHANG Yi2,BAO Qingying2,WANG Haijun3,LIU Jianwei3(1.China University of Geosciences,Beijing 100083,China;2.Research Institute of Petroleum Exploration and Development-Langfang,PetroChina,Langfang 065007,China;3.Research Institute of Oil Production Technology,Huabei Oilfield Company,Renqiu 062550,China)  
The high steep structure coal-bed methane(CBM)resources are abundant and widely distributed in high steep structures in China,so there is great potential for development.According to the characteristics of coal seams in high steep structures,a new technology,namely U-shape well drilling and completion technology,is proposed,and it is suitable for developing the CBM in high steep structure.Based on the geologic features of low-rank CBM in Huolinhe Basin,the U-shape well drilling and completion technology,the under-balanced drilling technology,and the surface acquisition technology,etc.,are also introduced in details.It comes to conclusion that the U-shape drilling and extraction technology has the advantages of both vertical wells and directional wells,it could implement the dewatering and gas producing with the geologic features and the energy of position,and it could also prevent the coal seams from pollution with the under-balanced drilling technology.By using the combined U-shape drilling technology,gas could be produced from the common vertical well for several U-shape wells,it could save a lot of surface facilities.
【Fund】: 国家“973”煤层气项目“提高煤层气开采效率的煤储层改造基础研究”(编号:2009CB219607);; 国家科技重大专项子课题“煤层气富集规律研究及有利区块预测评价”(编号:2008ZX05033)的部分内容
【CateGory Index】: TD842
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