Research and Application for Stepwise Fracturing Technique of Horizontal Wells in He 1 Formation of Daniudi Gas-field

To solve the problems of low pressure,low permeability,poor reservoir property,small radius of gas well control,low productivity,low EOR and other issues,the techniques of middle-long horizontal interval,3D seismic prediction,optimization stepwise fracturing design and outer packers stepwise fracturing were used for effectively determining the production in He 1 Reservoir.By comparison on field application effects,99.2% operation success ratio is achieved in horizontal wells,treatment efficiency is 93.3%,the productivity is 5.2 times more than vertical wells after fracturing.It achieves high efficient development of the difficult-to-produce reserves effectively,it also provides technical support for effectively producing in He 1 Reservoir of Daniudi Gas-field.