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1 Introduction Now,the key of oil-field’s increase production is the development technology for extra-low permeability reservoirs whose porosity is less than 5%and permeability less than 5 mD.The technologies of horizontal well,fracturing and gas driving are the advanced means of
1 Introduction Now, the key of oil-field’s increase production is the development technology for extra-low permeability reservoirs whose porosity is less than 5% and permeability less than 5 mD. The technologies of horizontal well, fracturing and gas driving are the advanced means of