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《Natural Gas Industry》 2009-09
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Characteristics of pre-production performance and technical countermeasures in the coalbed methane gas field of Qinshui Basin

MU Fu-yuan,SUN Fen-jin,WANG Yi-bing,ZHAO Qing-bo(Langfang Branch,PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China)  
There are abundant coalbed methane gas resources in the Qinshui Basin,and the China National Petroleum Corporation(CNPC)has performed large-scale exploration,production test and pre-production operation since 1994.Starting with the dynamic analysis of the geological features in the Qinshui methane gas field including structure,coalbed thickness and burial depth,coal rock characters and petrophysical property,gas content,evaluation on coalbed methane gas reservoirs,etc.,this paper focuses on the production performance in the production test of this field,the characteristics of which are summarized as follows:①the CBM gas production stimulated by fracturing and multi-branched horizontal wells are the effective means of developing this coalbed methane gas field;②the production data of the coal layer 3# demonstrates that gas production rate is closely related to geological features,especially to the three main factors of structure location,gas content,and the value of KH;③the producing fluid level should be maintained at a steady decreasing state in the process of gas recovery by water displacement.Based on the above analysis,technical countermeasures are suggested as follows:①vertical wells combined with multi-branched horizontal wells,in addition to the optimized well patterns and different stimulation means,should be effective for coalbed methane gas recovery in this field;②according to different geological conditions between the coal layer 3# and 15#,the coal layer 3# should be extracted prior to the coal layer 15#,and until the production rate of the former starts to decline the latter will not be put into production timely under the best situation of reservoirs;③at the early stage of gas recovery by water displacement,a reasonable working system and routine operation should be worked out with working parameters under control to watch out the sharp drop of reservoir permeability.
【CateGory Index】: P618.11
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