METHOD FOR INTENSIFICATION OF OIL RECOVERY Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: this particularly relates to methods for increasing oil recovery by treating bottom-hole zone of wells. According to method, bottom-hole zone of oil bed is subjected to treatment under pressure by suspension of hydrophobic water-repellent powder. Content of this powder is 0.1-2.5 mass% in organic solvent. Suspension is applied in amount of 0.5-3.0 m³ per each meter of effective zone of bed depth. Used as this powder are chemically modified over surface high-dispersive materials such as tetrafluorethylene, polyvinyl alcohol, oxides of titanium, silicon, iron, chromium, aluminium, zinc with marginal angles of wetting from 114 to 178 deg. and degree of hydrophobia from 96.0 to 99.99%. Used as solvent are light fractions of oil, distillate, kerosene, acetone, gas oil, hexane, gasoline, condensate. Pressure of injecting suspension is from 4.0 to 38.0 MPa. Period of treatment (reaction) is from 12 to 96 h. Higher pressure is created by means of pushing liquid or oil and technological holding under this pressure is undertaken during certain period of time. Application of aforesaid method allows for increasing output of producing wells by 3-10 times during 1.5 years and for reducing flooding of oil by 6-96%. EFFECT: higher efficiency. 5 cl, 1 tbl