OIL PRODUCTION STIMULATION METHOD Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly to stimulate oil production due to applying physical-chemical influence to well bottom zone.

SUBSTANCE: method involves injecting suspension of hydrophobic material in carrier liquid; creating increased pressure in well bottom zone by means of displacement liquid along with following setting thereof for a certain time period. The carrier liquid is inverted emulsion of hydrochloric acid solution or hydrofluoric acid solution or solution of aluminum hydrochloride in organic solvent. Hydrophobic material is sulfur powder added to the emulsion in amount of 0.5-2.5 % by weight. The displacement liquid is oil or process water. Suspension of sulfur powder in above inverted emulsion is injected in amount of 0.3-1.0 m³ per each running meter of effective formation thickness. Sulfur powder injection pressure in above inverted emulsion is 7.0-15.0 MPa. Time of sulfur powder setting in above inverted emulsion in well bottom zone is 24-48 hours.

EFFECT: increased oil output due to uniform productive formation reservoir surface hydrophobization and reduced water content in oil due to plugging water-bearing seams.

4 cl, 4 ex, 1 tbl