COMPOSITIONS AND METHODS OF TREATMENT OF WELL WITH WATER BARRIER Russian patent published in 2013 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: treatment method of an underground hydrocarbon-carrying formation containing non-fossil water involves bringing of the formation into contact with the composition containing an organic solvent and wetability modifying agent, where the solvent displaces or dilutes water in the formation, is contained in the quantity of at least 50 % of total weight of the composition; the modifying agent is anionic, non-ionic or amphoterous. The recovery method of the above formation treated with the first modifying agent according to the above method, where the treated formation is at least partially blocked with water involves bringing of the treated formation into contact with fluid medium at least partially displacing the water in the formation, where fluid medium mainly contains no wetability modifying agent; acquisition of information on characteristics from the formation; and determination on the basis of the information, whether repeated treatment with the second modifying agent shall be performed or not. The treatment method of the above formation containing fossil brine and at least one first relative gas permeability, where the formation is not otherwise blocked with liquid or damaged with liquid, involves bringing of the formation into contact with the wetability modifying agent and a solvent that dilutes or displaces fossil solution when the modifying agent is brought into contact, the formation has at least one second relative gas permeability that is at least by 5 percent higher than the first one.

EFFECT: improvement of productivity coefficient.

25 cl, 2 ex, 7 tbl, 3 dwg