Discussion on reasonable production allocation scheme of water producing gas wells in T3X2 gas reservoir in western Sichuan
The T3X2 gas reservoir of western Sichuan Basin is tight,gas wells generally produce water,there are large differences in fault-fracture body scale and water body strength,and the seepage mechanism is complex,which make the applicability of single productivity model and production allocation method poor.Comprehensive reasons lead to the unclear reasonable production allocation scheme of gas wells,which restricts the scale production and benefit development of the gas reservoir.This study established a gas-water two-phase productivity evaluation model for gas wells considering the influence of start-up pressure gradient and stress sensitivity.Then,combined with the gas production indication curve method,dynamic analysis method,open flow method and mathematical statistics method,the rational production allocation scheme of gas wells under the influence of different fault-fracture body scale,different water body strengths and comprehensive consideration of two factors is established,and the development practice of Xu 2 gas reservoir has proved its effectiveness and reliability.In addition,the production allocation of gas wells has a significant relationship with the scale of fault-fracture body and the strength of water body.The overall performance is that the more developed the fracture,the higher the production allocation,but the lower the production allocation ratio,while the higher the water body strength,the lower the production allocation,and the smaller the production allocation ratio.The research results provide practical value for the formulation of reasonable working system of gas wells in T3X2 gas reservoirs in western Sichuan.
fault-fracture body scalewater body strengthproduction capacityreasonable production allocationT3X2 gas reservoir in western Sichuan
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