METHOD OF STIMULATING HYDROCARBON EXTRACTION AND REDUCTION OF WATER PRODUCING LEVEL FROM UNDERGROUND FORMATION Russian patent published in 2009 - IPC C09K8/04 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to premium mud and to methods of stimulating hydrocarbon extraction with simultaneous reduction of volume of produced water from stimulated underground formation. Water solution for well treatment contains: water solution of hydrophilic reactive polymer consisting of at least one reactive amine group, hydrophobic compound chosen from halogen alkyl able to interact with hydrophilic reactive polymer and adequate amount of surface active substance able to improve dilution of hydrophobic compound in water solution. According to other versions water solution for well treatment additionally contains a pH regulating agent and hydrated galactomannan gelling agent. The method of stimulation or repeated stimulation of hydrocarbon containing formation, through which a well passes, consists in following stages: producing water solution including hydrophilic reactive polymer containing at least one reactive amine group, hydrophobic compound chosen from halogen alkyl able to interact with hydrophilic reactive polymer and adequate amount of surface active substance able to improve dilution of hydrophobic compound in water solution - bringing pH to at least 8, and in pumping water solution via a well borehole at a rate and pressure sufficient for breakdown of hydrocarbon containing formation. The invention also refers to other variants of the method. Water solution for treatment of wells contains hydrophobic modified solvent in water modifier of relative permeability obtained by means of interaction of hydrophilic reactive polymer consisting of at least one reactive amine group with hydrophobic compound chosen from halogen alkyl wherein hydrophobic modified solvent in water modifier of relative permeability presents approximately from 0.05% to 1.0% of weight of water solution for well treatment, while hydrated galactomannan gelling agent presents approximately from 0.06 to 0.72% from weight of water solution for well treatment. The method of stimulation or repeated stimulation of hydrocarbon extraction from underground formation, through which a well passes, and also reduction of water permeability of underground formation includes the following stage: pumping water solution for well treatment containing hydrophobic modified solvent in water modifier of relative permeability produced by means of interaction of hydrophilic reactive polymer consisting of at least one reactive amine group with hydrophobic compound chosen from halogen alkyl-pumping the above said through the well borehole at a rate and pressure sufficient for breakdown of formation.

EFFECT: selective reduction of permeability for water flow without reduction of oil flowing level.

79 cl, 2 ex, 2 tbl