Technology of Co_2 injection affected to improve coalbed methane recovery and CO 2 sealed storage

according to the key factors of the seam CO 2 iniection in Shihuang North Block toimprove the coalbed methane recovery rate and the site engineering selection.baed on theresevirfeatures of the study block.in combination with the orthogonal experiment design,a numerical simulaton study was conducted on theseam CO _2 injection to improve the coalbed metane recovey rate . The paper evaluated the injecion effct and poited out the resevoir permeatility thveshold of theC_2-ECBM engineeing selected block. The resuts showed tht the geologcal structure of the study block was simple,the sealing of the roof and foor was exceleent.he coalbed nethane reservoir could hav " fou high and twvo low" asic features including th deep depth,tick seam,high gas content and high trtialdesopion pessure as well as the mediun to low permeablity and low reservoir pressure .The key facto afced to the metane production increased efct with the seam Co 2 in ection in the study block vas the permeatiliy of the coal reservoir. A high pemeabiliy seam with the CO 2 ine ction would be favorable to improve the recovery rate.Alow permeability seam could be well o the CO_2 sealed storage. n orderto realize the seam CO_2 injction in Shithuang North block obiously improve the methane recovery rate,the permeablity of thereservoirshould be higherthan 0.05 ×10+/-3)pumn-2. in consideraton to improve the recovery rate and CO 2 efe civeresevoingthe permeability of the reservoir should be( 0.05～0.22)×10~(-3)um~2.