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根据火山岩气藏特点建立了反映气藏渗流特征的双重介质数学模型,应用数值模拟的方法研究基质孔隙-裂缝-井筒之间的供排气机制,定量分析了不同产量的气井定产条件下,窜流系数λ对火山岩气藏稳产的影响程度。数值模拟结果表明,双重介质气藏气体窜流过程包括过渡段和稳定段,过渡段基质窜流量小于井底产出量,井底压降快,稳定段窜流量与井底产量相当,井底压降变缓,气体窜流进入稳定段所需时间决定于窜流系数。当窜流系数大于10-7时,窜流对气井生产影响较小;但当窜流系数小于10-8时,气井稳产受窜流影响严重,此时根据气井窜流系数的大小合理配产显得十分重要。结合新疆某口井的实例进行计算,验证了数值模拟结果的可靠性,证明供排气机理数值模拟对气藏高效稳产开采有一定的指导意义。
According to the characteristics of volcanic gas reservoirs, a dual medium mathematical model reflecting the seepage characteristics of gas reservoirs is established. The mechanism of gas supply and discharge between the matrix pores and fractures and the wellbore is studied by means of numerical simulation, and under the conditions of fixed production of gas wells with different yields, The effect of channeling coefficient λ on the stable production of volcanic gas reservoir. The numerical simulation results show that the gas cross-flow process in the dual-medium gas reservoirs includes the transitional section and the stable section, and the matrix channeling flow in the transition section is smaller than the bottom hole output. The pressure drop at the bottom of the well is fast and the channeling flow in the steady section is equivalent to the bottom hole output. The pressure drop slows down, and the time required for the gas to flow into the stable section depends on the channeling coefficient. When the channeling coefficient is greater than 10-7, the channeling effect has little effect on gas well production. However, when the channeling coefficient is less than 10-8, the stable production of gas wells is seriously affected by the channeling effect. At this time, the channeling coefficient of gas wells rationally allocates It is very important. Based on the example of a well in Xinjiang, the reliability of the numerical simulation results is verified. It is proved that the numerical simulation of the mechanism of gas supply and discharge is of guiding significance to the efficient and stable production of gas reservoirs.