蜡沉积对凝析气田开发动态和生产的影响

INVESTIGATION OF PRODUCTION TREND AND EFFECT FACTORS OF MULTIPHASE COMPLEX FLOW WITH PHASE CHANGE AND WAX DEPOSITION

由于蜡的沉积和运移使凝析气-液流动更加复杂化,而相变特性会导致储层内油气饱和度的变化,蜡沉积在多孔介质表面引起孔隙性质改变,气、液、固在储集层中的微观空间分布会影响凝析气的流动特征。在蜡沉积变相态渗流实验和凝析气液渗流理论的研究基础上,引入气液固PVT相态模型、蜡沉积数学模型和考虑蜡沉积对渗透率的影响模型等,建立了相应的多孔介质中气液固变相态多相流-固耦合渗流数学模型,揭示了凝析气液固复杂流动规律和对生产开发动态的影响。

The condensate gas liquid-solid of multiphase complex flow is complicated with phase change and wax deposition. In the process of condensate gas percolation flow in reservoir, gas-liquid-solid may be thransformed with phase change, which will result in the change of distribution of fluid pressure and influence or alter the characteristic and the process of condensate gas percolation flow accordingly, the porous flow mathematic models of multiphase complex flow with phase change and wax deposition is founded. The mechanical characteristics of fluids flowing through porous media and the relevant physicochemical problem may be all summed up as sloving the gas-liquid solid coupling mathematical model. After considering the phase change action between condensate gas and condensate liquid , wax deposition, interlarded with interfacial drag force and capillary pressure engendered in the process of phase change, laying a theoretical foundation for studying and predicting the production behavior of condensate gas