变导流能力下压裂井生产动态研究

人工裂缝长期导流能力随时间变化， 据此建立了考虑人工裂缝长期导流能力变化的数学模型。应用数值模拟方法研究长期导流能力变化对地层压力场及流场分布和压裂井产能的影响。数模结果表明： 裂缝长期导流能力的损失， 会导致地层流体更多地通过井底附近的裂缝流入井底， 优化了裂缝内的流场， 减缓了压裂井产能递减速率； 其他情况相同时， 裂缝半长越长， 裂缝长期导流能力的损失对压裂井产能的影响越大。

Study on Production Performance of Fractured Well Under the Condition ofVariable Conductivity

A large number of experimental studies have shown that long-term flow conductivity of artificial fracturechanges over time. So this paper establishes mathematical model of percolation in the condition that the long-termflow conductivity of the artificial fracture alters over time. By numerical simulation， this paper states about theimpacts of change of the long term flow conductivity on the production and flow field. The results show that theloss of the flow conductivity will lead more formation fluid to the bottom of well through the fracture near thebottom， which makes the flow field in the fracture reasonable and slows down the decreases of productivity. Whenother conditions are same， the longer the fracture is， the more impact the lost of the flow conductivity has on theproductivity.