Evaluation study on hydraulic fracturing parameters of vertical well in high ranking coal reservoir of Zhengzhuang Block

in orderto seek the igh rankcoalreservoir features suitable for the well ydrauli fracturing inZhengzhuang Blck,from the regional geological background,.with the analysis on the production information,well loging and test reprt as well as other infomaton.the factors affeced to the capacity diferences of the veric:l wells in Zhengzhuang Block were studied.The resuts showed that the differencesof the regional rical wls were mainly caused due tothe hyrauli frcturing tectnology not matched to the geological features of the regional coalresevorthe hydrauli frcturing efe ct of the vertctal .e wul be mainl cotrol ldby thec al stcture,adsorption pressure geostress ,fuid dredgeablity of the reservoir and oter factors and thosefactors would be jonti ffected to the development ef c of the hig rank coalbed methane. Among them,the Type I and Ⅱ capacity unit's reservoir features would be suitable for the reconstruction method of the present hydraulie fracturng.the percentage of the initu structure cal should be hicher than 0 3 at less the adsoption pressure should be higher t han 2.0 MPa.the geosress index should be higher than 0.9 and the fuid dredgeabity index should be igher than 20. Under the present features 7ype Ⅲ and NV copaity unis resevoirs features would not be suitable for the reconstruction method with the hydrauli fracturing of the verical wel or the productio increasing and should consioeroter measues to increase the production.