底水气藏水侵物理模拟实验与数学模型

The Physical Experiment and Numerical Model of Water Invasion to the Gas Reservoir

应用实验与数值模拟相结合的方法对底水气藏衰竭开采过程中的水侵规律进行了研究。首先通过底水气藏衰竭开采的物理模拟实验,得出水侵规律及各参数随时间的变化数据,然后建立岩心尺度的水侵数学模型,该数学模型在实验条件下计算出的压力数据与实验结果具有很好的一致性,进一步通过数学模型计算,分析得到影响水侵规律的敏感因素。渗透率和产气速度,决定了稳产期采收率。水体可以为气藏提供一定的能量,水体大小对采出程度的影响很小。

The law of aquifer water influx to the gas reservoir in the gas production was studied by physical and numerical modeling. Firstly, the law of water influx into gas reservoir and the relationships of several parameters versus time were derived by physical modeling testing. Secondly, the mathematical model in core scale was con structed, the pressure data calculated from which is consistent with the testing data in the same experiment condi tion. Finally, the sensitivity factors were conducted by numerical calculation. The parameter permeability and gas production rate determined the recovery of stable gas production period. The aquifer can provide certain power for gas production but the parameter volume of aquifer water have a small imnnct an lh