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从储层进入到井筒的气流对气井中存在的水锁效应具有蒸发清除作用。产生这种水锁清除作用主要是因为天然气进入井筒后发生膨胀,导致额外的水在近井地带蒸发。研究工作表明,被膨胀天然气清除的水会遗留下一个饱和度剖面,而这点对低渗透率岩层和高渗透岩层而言是截然不同的。根据岩层的渗透率和气井的生产压降,天然气相对渗透率或气井产能随时间的变化会很大。为了确定水锁蒸发清除对气井产能的影响,研究并推出了一种模型。
The gas flow from the reservoir into the wellbore has the effect of evaporative removal of the water lock effect present in the gas well. This water lock removal is primarily due to the expansion of natural gas as it enters the wellbore, causing additional water to evaporate in the near-wellbore. Research shows that water swept out by expansive natural gas leaves a saturation profile that is quite different for low-permeability and high-permeability formations. Depending on the permeability of the formation and the production pressure drop of the gas well, the relative permeability of natural gas or productivity of the gas well over time will vary widely. In order to determine the impact of water-lock evaporative removal on gas well productivity, a model was developed and introduced.