Establishment of Productivity Numerical Model of Fractured Horizontal Gas Wells

Accompanied with the widely used of fractured horizontal wells technology in tight gas reservoir,productivity prediction after fracturing of developing this kind of gas reservoir is of great significance.According to the complex potential theory and potential superposition principle,combined with the shape of fractures after fracturing and single-phase gas seepage mechanism,a new productivity prediction model considering pressure drop loss in horizontal wellbore was derived.Model considers the influence on productivity of fractures produced by mutual interference between fractures and the length,width,conductivity,interval of fractures and the influence on horizontal wells produced by pressure drop loss.A gas well productivity numerical model considers multi-factor was established and a simulation software was compiled.Take a tight gas reservoir in Changqing oil field as an example,a fracturing scheme optimization is designed.Research results have significance to the tight gas reservoirs pattern arrangement and making up development plan.