Through plenty of investigation and study on literatures worldwide, forming mechanisms and impacts on gas well deliverability of near-wellbore plug and water lock were analyzed for condensate gas reservoirs.

Based on latent damage factors,the author runs water lock and different sensitive e.

The study shows that effects of water sensitivity, water lock, Jiamin action and water saturation on 2 phase percolation in low permeability reservoirs, water flow capacity can be effectively improved by reducing interfacial tension, oil-water viscosity ratio and displacement velocity have obvious influence on displacement efficiency.

Based on the correlation analysis principle of grey theory, a grey correlation analysis method is established for qualitative discrimination of water blocking degree in gas reservoir production, application examples are given.

During the course of exploitation in oil reservoir and gas reservoir condensation water, formation water, especially drilling mud, acidizing liquid and fracturing fluid can result in water blocking.

During the exploitation of gas condensate reservoir, especially the low permeability reservoir, the condensate oil will come out when the pressure drops down to the dew-point pressure, which will cause condensate block and decreases the well productivity, the situation will be worse if the water block exist.

Study on water lock effect in low permeability reservoir;

Laboratory testing method of water lock effect of gas reservoir and its relationship with water saturation;

Research progress of water lock effect in low permeability gas reservoirs;

In this paper, based on a lot of experiments, water lock mechanism, affections to exploitation, and the ways to release water lock damage were studied.