Reagent on Oil Basis to Increase Oil Recovery and Isolation of Water Breakthrough into Oil Producing Wells

The issue of selective isolation of water inflow into oil producing wells is considered in the article. For this purpose, an oil - based composition was developed for selective isolation of water from the formation to producing wells. The composition, in addition to oil, also contains alcohols (lower alcohols: methyl, ethyl, butyl, propyl, etc.), and an oxidizin g agent. Components of the in gredients are met in the bottomhole zone of the well where a chemical reaction occurs, resulting in a paste - like substance. This substance blocks both water and oil channels. However, this substance does not dissolve in water, but it dissolves well in oil. This property gives an ability to the composition to isolate water selectively. Thus, the plugged water channels prevent the flow of water into the well, while part of the composition which clogging the oil channels dissolves into the oil, releases the oi l channels and provides the flow of oil from the formation into the well.