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《Coal Science and Technology》 2016-05
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Study on drilling/cementing technique affected to production control of coalbed methane vertical well

Liu Shiqi;Sang Shuxun;Li Mengxi;Zhu Qipeng;Liu Huihu;Research Institute of Low Carbone Energy,China University of Mining and Technology;School of Resources and Geosciences,China university of Mining and Technology;Shanxi Coalbed Methane Branch,PetroChina Huabei Oilfield Company;School of Earth and Environment,Anhui University of Science and Technology;  
In order to optimize the coalbed methane well drilling and cementing technical parameters,according to the production data,drilling and cementing information of 71 coalbed methane vertical wells in Fanzhuang Block at the south part of Qinshui Basin,the paper discussed the density and viscosity of the drilling liquid,the density and amount of the cement grout for the well cementing and the replacement liquid amount to the control mechanism of the production capacity.The results showed that when the density of the drilling liquid was less than 1.05 g/cm~3,the viscosity was less than 30 s,the cement grout density of the well cementing was less than 1.85 g/cm~3,amount of the cement grout for the well cementing was less than 22.5 m~3 and the displacement fluid volume was less than 10.0 m~3,the coalbed methane well could have a high production.A high density of the drilling liquid and the cement grout for the well cementing,a high density of drilling liquid as well as a high volume of cementing cement grout and replacement liquid all would cause the solid media accumulation in the pores and cracks of the coal reservoir,the permeability reduced and would not be favorable to the water discharging,pressure drop and coalbed methane output.With the integration with the drilling and cementing techniques affected to the production capacity of the coalbed methane well,the optimized drilling and cementing technical parameters were provided and could provide the references to the drilling and cementing engineering implemented and the coal reservoir protection.
【Fund】: 国家自然科学基金项目(41330638 41402135 41272154)
【CateGory Index】: TE328
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