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《Natural Gas Industry》 2014-01
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Effect of drill-in fluids on CBM desorption,diffusion and percolation: A case study of No.9 Coal Seam of the Ningwu Basin

Li Xiangchen;Kang Yili;Chen Defei;Chen Fei;State Key Laboratory of Oil &Gas Reservoir Geology and Exploitation ∥Southwest Petroleum University;Changqing Downhole Technical Service Company of Chuanqing Drilling Engineering Co.,Ltd.,CNPC;  
With absorbed gas as the main part of coalbed methane gas,its output highly depends on the desorption,diffusion and percolation process,however,it is not enough to evaluate the CBM formation damage only by the Darcy′s permeability.In view of this,according to the coal microscopic structure features and CBM migration mechanism,experiments of CBM desorption,capillary imbibition and dynamic/static damage evaluation were conducted with coal samples from No.9Coal Seam of the Ningwu Basin as well as the field drill-in fluids.The effect of the drill-in fluids on CBM desorption,diffusion and percolation was analyzed by the microscopic method.The results show that the actual desorbed gas volumes and diffusion coefficients from the coal samples under the interaction of the drill-in fluids are both lower than those of the other coal samples under equilibrium or saturated conditions at a given temperature and pressure.Compared with the formation water,coal rocks have stronger imbibition of drill-in fluids and serious adsorption retention,which results in lower gas flowback rates.The results of dynamic/static evaluation show that the damage of drill-in fluid filtration is the main cause for coal seam permeability decline.Combined with the analysis results of Fourier transform infrared emission spectroscopy(FTIRES),the measurement of wetting angle,and scanning electron microscopy(SEM),it is believed that the coal structure,wettability and pore connectivity will affect the gas migration in coalbed methane reservoirs under the interaction of the drill-in fluids.
【Fund】: 国家重点基础研究发展计划(973计划)(编号:2010CB226705);; 特色重点学科建设项目资助青年教师科学基金项目(编号:P022)
【CateGory Index】: TE257.6
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