针对水侵型储气库多周期注采时气水互驱渗流机理复杂、有效储集空间演化规律不清晰等问题,选取文96储气库储5井岩心作为研究对象,开展了多周期气水互驱在线核磁共振驱替实验。通过实时监测T2谱及信号分布特征,系统地分析了储层物性、驱替压力和注采速率对气水互驱效率的影响。结果表明:储层物性对气水互驱效率的影响显著,针对储层渗透率小于5.00 mD的低渗储层,经多周期注采后气体可动用孔隙体积下降约15%,而渗透率大于80.00 mD的储层多周期注采后气体可动用孔隙体积下降约2%,且孔隙体积缩减主要集中于前3个注采周期;驱替压力与可动空间成对数关系,临界压力约为17 MPa,低于此阈值时驱替效率显著降低,高于该值则流体分布趋于均质化;当注采速率提升至2.0 mL/min时,可动空间增加约7%,表明高速注采可通过增强驱动力减少流体滞留;多周期注采所引发的渗流滞后效应不断累积,将导致有效储集空间持续缩减。该研究为水侵型储气库的库址优选、注采参数的优化及运行效率的提升提供了理论依据与技术支撑。
Due to the complex gas-water mutual displacement flow mechanisms and insufficient understanding of the evolution of effective storage space during multi-cycle injection-production in water-invaded gas reservoirs,this study selected the core from Well 5 of Wen 96 Gas Storage as research object and carried out online nuclear magnetic resonance(NMR)displacement experiments under multi-cycle gas-water mutual displacement.By real-time monitoring of T2 spectra and signal distribution characteristics,the effects of reservoir physical properties,displacement pressure,and injection-production rates on gas-water mutual displacement efficiency were systematically analyzed.The results indicate that reservoir properties have a significant impact:in low-permeability reservoirs with permeability below 5.00 mD,the recoverable gas pore volume decreases by about 15% after multi-cycle injection-production,whereas in high-permeability reservoirs with permeability above 80.00 mD,it decreases by only about 2%,with most of the pore volume reduction occurring in the first three cycles.Displacement pressure correlates logarithmically with recoverable space,and a critical pressure of around 17 MPa is identified.Below this threshold,displacement efficiency declines significantly,while above it,fluid distribution tends to become homogeneous.When the injection-production rate is increased to 2.0 mL/min,the movable space increases by about 7%,indicating that high-rate injection-production can reduce fluid entrapment by enhancing drive forces.The cumulative seepage hysteresis effect induced by multi-cycle injection-production continues to reduce effective storage space,a phenomenon calling for special attention in long-term operation.This study provides theoretical guidance and technical support for site selection optimization,injection-production parameter optimization,and operational efficiency improvement in water-invaded gas storage reservoirs.
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