Study on production increased technology with secondary hydraulic fracturing in Zhengzhuang Block of Qinshui Coalbed Methane Field

There was some low production wells existed in Zhengzhuang Block afer the development and the major causes were the frst hydrauli fracturing technique and fechnology not suitable to the low permeaility and high compicated high anking coal reservoir features.ln orderto improve the development efct of the block.the secondary fractring and producion increased technology sutable to the coal reservoir features of the block was studi d.with the distinguishnent of the coalresrvoirfeatures study on the secondary hydrauli fracturing and production increased mechanism,idea to change the fracturing constouction and other work,fou production increased fechnologies suitable to different cal reservofr features were established and were applied to the stes of 0 wells.The applcation resuts s howed ht aftethe secondary hydraulic fracturing and production increased fechnology conducted, new arifcal cracks o artifia cracks netvork were fomed in the low permealliy seam.structure sot coal and high cracking seam.The permeability rate of the cal reservoir was improved and the gas production of the lo w gas production well oud be improved .An average dally production of a single wll had improved over650 m-3.d.T7he technology appied solved the law production ell nZhengzheang Bock andcould improve the development effect of the similar type coalbed methane field.