1.MOE Key Lab of CBM Resources and Accumulation Process,China University of Mining and Technology,Xuzhou ,China；2.Xinjiang Clean Seed Energy Company Limited,Fukang ,China

In order to explore the dynamic variation features of the reservoir physical property in the gas drainage process of the steep inclined coal reservoir,the Eclipse numerical simulation software was applied to the historical fitting and the well type optimization of the coalbed methane wells in Fukang Western Block at the southern edge of Junggar Basin,to analyze the dynamic variation features of the pressure and gas content in the up inclined and down inclined reservoirs during the gas drainage process of the steep inclined reservoir and to compare the production capacity differences between the different well network and different horizontal well layout. The results showed that the pressure drop rate of the up inclined reservoir was higher than the down inclined reservoir,thus the gas content in the up inclined reservoir was reduced higher than the down inclined reservoir and the contribution of the production capacity mainly was come from the up inclined orientation. When the gas drainage scope was determined,the coalbed methane well set in the up inclined orientation of the reservoir would be favorable to the development of the coalbed methane. Under the same length condition of the horizontal well,the horizontal well in and along the seam would have the production capacity higher than the horizontal well passed through the seam.