Condensate Gas Well Condensate Phenomenon And Fracturing Capacity Study

An important difference between gas condensate reservoirs and other kinds of reservoirs lies in the fact that when producing, with the pressure goes down, heavy components will be separated out into liquid. With time goes on, condensate liquid will gather around the well bore. The phenomena not only prevent gas flowing, but also lead to the losing of heavy components. In some kinds of condensate reservoirs, condensate blockage can reduce well deliverability significantly. It is the same in fractured condensate reservoirs. The condensate banking not only appeared around well bore, but also around the hydraulic fracture. At present, these infections haven't been considered when simulate production performance after fracturing. As a result, fracturing parameter optimization can't achieve prospective purpose, and the effect of fracturing can't meet the purpose too. Therefore, only by taking condensate banking into consideration can make accurate simulation for condensate reservoir production.In this paper, a new components mobility term has been defined to analysis the behavior of condensate banking. The paper based on dynamic method and material balance principle, by means of PVT calculations and relative permeability modeling and anglicizing, and combines with fluidity property, derived dynamic changing status of condensation in the production process of condensate reservoirs. Result shows that fluidity property is an important parameter to represent dynamic status of condensation.The paper represented equalized oil gas phase components, mole fraction, equilibrium constant and equation of material balance in relation to temperature and pressure; equibalance oil-gas buildup, equilibrium constant and fugacity equation. And use this for phase balance calculation. Through using Darcy's law, we represented flow equation for each phase in manmade fracture and matrix. Combined boundary condition and initial condition, formed the model for production performance prediction of fractured condensate reservoirs. In addition, based on equivalent enlargement principle, we established corresponding finite difference numerical calculation model, and corresponding calculation results have been given.Regards to simulation and calculation results, the paper analysis the affection of fracture length and mole fraction of heavy components in relation to condensate production. All the results show that fluid components and condensate banking have strong impacts on production performance after fracturing. Detail discussing has been made in the main content in this paper.