Gas Field Horizontal Wells A Reasonable System Of Work Study

In this paper, Productivity analysis theory of low permeability gas horizontal wells have been established, combined with gas reservoir geology and gas well production performance, researched the DPR and IPR and their influential factor, identified the reasonable working system of the horizontal wells.By studying, draw some conclusion:(1) By establishing mathematical model of low permeability gas horizontal wells, obtain the producibility equation of low permeability gas horizontal wells and establish turbulent flow equation of horizontal wells by considering reservoir damage and non-darcy effect, provide the theoretical base about deliverability analysis of horizontal wells.(2)By using turbulent flow equation of low permeability gas horizontal wells, analyse the effect of sand thickness, horizontal length, non-isotropic, reservoir damage and threshold pressure gradient on IPR of jingbian horizontal wells.(3)Establish theoretical equation of productivity index ratio on horizontal wells for vertical well, case of longping 1 well, compared the productivity index of horizontal and vertical wells from sand thickness, horizontal length, non-isotropic,reservoir damage and threshold pressure gradient.(4)Established the theory and methods of the horizontal production systems analysis, drawed the curve of production systems analysis about jingbian horizontal wells, researched the effect about formation pressure and varying caliber on production systems analysis curve.(5)Established the theory and methods of the horizontal liquid-carrying capacity, drawed coupling curve about liquid-carrying capacity and IPR of jingbian horizontal wells, and researched the effect about formation pressure and varying caliber on coupling curve.(6)By using thumb rule, nodal analysis, liquid-carrying critical flow and gas production curve, researched the reasonable working system of the horizontal wells, obtained the reasonable proration production of the horizontal wells in different methods.The research is instructive in low permeability gas horizontal wells development.