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对北海两个凝析气藏的凝析油流动特性进行了岩心驱替试验。目的是调查岩石特性和流体性能对凝析油临界饱和度 (CCS)、气体相对渗透率和凝析油相对渗透率、注水采收率和注水圈闭以及后续降压开采采收率增量的影响。凝析油临界饱和度和相对渗透率对流速和界面张力都很敏感。气体相对渗透率对流速敏感性说明 ,因凝析油从气体中析出而造成气体产量的降低可通过提高开采速度得以补偿。界面张力大最终会导致凝析油相对渗透率降低、凝析油饱和度增加。注气开采时不可动凝析油可以通过注水采出。但是 ,当注水前凝析油饱和度超过凝析油临界饱和度时 ,凝析油的开采更快更有效。后续降压开采能进一步采出气体。但是采出的凝析油量增加不明显。
Core flooding tests were conducted on the condensate flow characteristics of two condensate gas reservoirs in the North Sea. The objective was to investigate the effect of rock properties and fluid properties on condensate Critical Saturation (CCS), relative gas permeability and relative permeability of condensate, waterflood recovery and waterflooding traps, and incremental recovery of depressurized recovery influences. Condensate critical saturation and relative permeability are sensitive to both flow rate and interfacial tension. The sensitivity of gas relative permeability to flow rate indicates that the reduction of gas production due to the precipitation of condensate from the gas can be compensated for by increasing the production rate. Large interfacial tension will eventually lead to lower relative permeability condensate, condensate oil saturation increased. Gas injection mining immobile condensate can be recovered by water injection. However, when condensate saturation before condensate exceeds the critical saturation of condensate, condensate recovery is faster and more efficient. Subsequent depressurization mining can further produce gas. However, the increase in the amount of condensate collected is not significant.