Application and Effect of Water Lock Release Technology in Sulige Gas Field

The water lock effect is a common problem in the development process of gas fields, mainly manifested as a decrease in gas phase permeability after the water saturation of the gas reservoir changes. The water lock damage caused by the accumulation of liquid at the bottom of the well in the near wellbore reservoir has led to a sudden decrease in gas well production, seriously affecting the efficient development of the gas field. The Sulige gas field belongs to a typical low-pressure, low-permeability, and tight sandstone gas field. Currently, it has entered the middle and late stages of production. Most gas wells are already in the low production and low-pressure stage due to the continuous decline of formation energy, and there are varying degrees of water production in the gas reservoir. The study of reservoir water lock has become a key technical field for improving oil recovery in gas fields. Based on the production demand of Sulige gas field and the problem of water lock in gas reservoirs, the conditions for water lock in gas reservoirs and the main factors affecting water lock in gas reservoirs were studied on the basis of multi factor analysis. Subsequently, the damage assessment of water lock in gas reservoirs was conducted; Analyze the main methods of water lock release in gas fields and conduct research on on-site water lock release agents; The on-site optimization of the water lock removal process has verified the feasibility of the water lock removal technology in this area, which is of great significance for the recovery of gas field production.