POLYSACCHARIDE FLUID FOR TREATMENT OF NEARWELLBORE AREA AND METHOD FOR TREATMENT OF SUBTERRANEAN STRATUM Russian patent published in 2014 - IPC C09K8/524 C09K8/588 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to treatment of nearwellbore area applied for treatment of subterranean stratum crossed by the well bore. Fluid for treatment of nearwellbore area and method for treatment of subterranean stratum crossed by the well bore contains aquatic environment; diutan polysaccharide with a repeating tetrasaccharide unit in the main polymer chain, peroxide gel liquefier reacting with diutan; gel liquefaction accelerator or at least one catalyst selected from ferric sulfates (II) and its hydrates, ferrous chloride (II), iron powder with pH control agent and combination of the above materials; and agent controlling iron contamination of the stratum. Method for treatment of subterranean stratum crossed by the well bore includes injection of the above fluid intended for treatment of nearwellbore area through the well bore to the stratum. Invention is developed in dependent claims.

EFFECT: facilitation of polymer-containing fluids removal within the wide range of temperatures.

13 cl, 14 ex, 15 dwg