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与常规层状沉积储层不同,火山岩储层储集空间复杂多样,发育有不同规模尺度的孔缝组合方式,非线性渗流机理复杂,存在应力敏感、滑脱效应及“接力”排供气机理。受非线性渗流机理的影响,气井生产动态规律与常规储层气井差异较大。基于火山岩储层多尺度、多介质的特点,结合火山岩气藏非线性渗流机理,利用多个火山岩气藏气井实际生产动态资料,将气井的开发过程划分为初期高产、产量递减和低产稳产3个阶段,并运用Eclipse数值模拟技术对实际气井的生产动态进行拟合预测分析。在气井生产动态分析的基础上,考虑滑脱效应及应力敏感的影响,形成了气井生产动态预测方法,并对12口生产井产能进行拟合预测,其中有10口井的计算结果与实际生产情况相符。研究结果对预测气井产量、合理配产具有重要意义。
Different from conventional stratigraphic sedimentary reservoirs, volcanic reservoirs have complex and diverse reservoir spaces, and have combinations of pore-sockets with different scale scales. The mechanism of nonlinear seepage is complex and there exist stress sensitivity, slippage effects and gas supply to the “relay” mechanism. Due to the non-linear seepage mechanism, the dynamic laws of gas well production are quite different from the conventional gas wells. Based on the multi-scale and multi-media characteristics of volcanic reservoirs and the non-linear percolation mechanism of volcanic gas reservoirs, the actual production of gas wells from several volcanic gas reservoirs is used to divide the development process of gas wells into three types: high yield, low yield and low yield Stage, and using Eclipse numerical simulation technology to predict the actual production of gas wells. Based on the dynamic analysis of gas well production, considering the effect of slippage and stress sensitivity, a dynamic prediction method of gas well production was formed, and the productivity of 12 production wells was fitted and predicted. Among them, the calculation results of 10 wells and the actual production Match. The results of the study are of great significance for predicting gas well production and rationing rationally.