碳酸盐岩气藏气体单相渗流特征实验研究

An Experimental Study on the Percolation Characteristics of Single Phase Gas in Carbonate Gas Reservoirs

针对碳酸盐岩气藏含水条件下的渗流机理与常规气藏相比表现出的不同的非线性渗流特征问题,以X气藏4块全直径岩心为研究对像,以渗流理论为基础,在常温常压条件下开展渗流机理实验测试及分析,掌握碳酸盐岩气藏的非线性渗流特征及影响因素。研究结果表明:碳酸盐岩含水气藏气体渗流普遍存在4种渗流特征:阈压效应、滑脱效应、达西渗流和高速非达西渗流;随岩心含水饱和度增加,气体渗流表现出阈压效应增强、滑脱效应减弱、高速非达西流效应增强的特点。

Carbonate gas reservoirs with water saturation have different non- linear flow characteristics when compared with conventional gas reservoirs. With percolation theory diagnosis technique,four full- hole core examples of X gas reservoirs are used to test and analyze percolation characteristics through percolation theory experiments at normal pressures and temperatures. The results show that gas flow in carbonate gas reservoirs generally exists four flow effects as follows： threshold pressure effect,slippage effect,Darcy flow effect and high- speed non- Darcy flow effect; with increasing water saturation,gas flow has features of higher threshold pressure effect,lower slippage effect and higher high- speed non- Darcy flow effect.