METHOD FOR TREATMENT OF WELL BOTTOM ZONES OF PRODUCTION WELLS Russian patent published in 2009 - IPC E21B43/25 

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil and gas production industry, namely to methods for reagent treatment of well bottom zones of oil, gas-condensate and injection wells to remove oil -, water- and acid-soluble colmatants when working on underground repair of wells, extracting influx from bed or other works. Method is realised by means of pumping and pushing of foam-generating reagents in bed, such as nitrogen-generating reagents together with surfactants, and de-colmatage reagents. De-colmatage reagents used are acid and/or surfactants and/or organic dissolvent, nitrogen-generating reagents are sodium nitrite with urea and sulfamine acid or sodium nitrite with ammonium salt or sulfamine acid.

EFFECT: diversion of de-colmatage reagent into oil-saturated intervals and increased capacity of oil-saturated intervals to receive de-colmatage reagent.

3 ex, 4 dwg