Study On Parameters Affecting Productivity Of Fractured Horizontal Well In Tight Oil Reservoir

Due to its poor formation property,it is a big challenge to develop the tight oil reservoirs efficiently.Fractured horizontal well technology can effectively transform reservoir and largely increase the use of oil and gas reservoir,which makes it the key technology to develop the tight oil.According to the complexity of the target reservoir horizontal well staged fracturing in this paper,a reliable production prediction model was made to study and optimize the parameters,which has theoretical guidance meaning for development of tight oil reservoirs.Aimed at the targeted block,a production prediction model was made and compared with the conventional production prediction models.And then MATLAB was used for the modified prediction model.Fractured horizontal well parameters were analyzed and optimized through numerical simulation analysis method,such as number of fractures,fracture half-length,fracture conductivity,formation permeability,starting pressure gradient and horizontal well length,which provides theoretical guidance for development of tight oil reservoirs.Results show that the modified production prediction model has practical implications,which was proved right through being compared with the real production and conventional production prediction models.With higher permeability,production increased,but growth decreased;starting pressure gradient changed between 0.001 MPa/m and 0.01 MPa/m,production decreased of very little;production increased with fracture half length,but growth decreased and the optimal value of target block was 160 m;fracture density was good for production capacity,but when it increased,the interference effect between fractures became stronger,so there was a reasonable fracture density,and in this case,it's 1/100 m;production increased with fracture conductivity,and its growth decreased when fracture conductivity was 400×10-3?m2·m,and aimed at the targeted block,the optimal value was of 300~400×10-3?m2·m;when water saturation was less than 0.5,fracture conductivity,half-length and horizontal well length had great influence on production,while it was bigger than 0.5,impact was very low.