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针对位于缝洞型底水油藏大型溶洞处的单开临界产量计算和水锥预测缺少有效方法的实际,考虑洞内、洞外两种流动力学特征和流动规律的不同,分别在二项式流动模式和线性流动模式基础上推导出了临界产量下用于描述洞内外水锥形态的计算公式,建立了由开发初期稳定试井资料获取关键参数的方法,并可用试算法计算临界产量。应用实例表明,洞内的水锥在近井区形成尖峰,并向外快速降低为平台;洞外水锥与洞内水锥形态明显不同,其形态由内而外逐渐变缓。
In view of the fact that there is no effective method for calculating the single-open critical production and the prediction of water coning at the large caverns in the fractured-hole bottom-water reservoirs, considering the difference of the flow mechanics and flow characteristics inside and outside the cave, Based on the flow pattern and the linear flow pattern, the formula for describing the shape of the water cone inside and outside the cavity under critical mass is deduced. The method of obtaining the key parameters from the stable well test data is established and the critical yield can be calculated by trial method. The application example shows that the water cone in the cave spikes near the well and rapidly decreases to the platform. The water cone outside the cave is obviously different from the water cone inside the cave, and its shape gradually becomes slower from the inside to the outside.