METHOD FOR EQUALIZING OF INTAKE CAPACITY PROFILE IN PRESSURE WELLS AND OF LIMITING INFLOW IN PRODUCING WELLS Russian patent published in 2008 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, particularly to alteration of filter characteristics of non-uniform formations, to growth of oil withdrawal and to reduction of watering in producing wells with obtaining maximum effect at later stages of oil deposit development due to implementation of visco-elastic polymer compositions. According to the method of equalizing the intake capacity profile in pressure wells and limiting inflow into producing wells, including preparation and successive pumping into the formation of polymer gel-forming compositions, volume of pumping is preliminary determined, then 15% of porous volume of the first fringe of polymer composition is pumped, wt %: carboxymethyl cellulose - CMC - 0.3-5.0, cross-linker - chromium acetate - 0.05-0.5, water with mineralization - 0-290 g/l- the rest, where water with mineralization 50-290 g/l is used for preparation of cross-linker, then the second portion of the fringe is pumped in portions alternating with water pumping with surface active substance -SAS and the first fringe. The second fringe has the composition, wt %: polyacrylamide - PAA - 0.01-2.0, chromium acetate 0.05-0.5, water with mineralisation of 0-290 g/l - the rest. Then the well is stopped for process conditioning for 1-5 days. The invention is developed in dependent claims.

EFFECT: increased oil withdrawal of formation, reduced watering of producing wells, and expanded technological capabilities of method.

4 cl, 1 tbl