COMPOSITION FOR LEVELING INTAKE CAPACITY OF INJECTING WELLS, REDUCING WATERING, AND INCREASING OIL RECOVERY, AND A PREPARATION METHOD Russian patent published in 2006 - IPC C09K8/588 

FIELD: oil and gas production.

SUBSTANCE: invention relates to well-boring development of oilfields. Composition according to invention contains 0.005-0.10% of aqueous solution of exopolysaccharide produced by Azotobacter vinelondi (Lipman) FCh-1, VKPM V-5933 in the form of culture fluid, 0.5-5.0% of starch, water, and additionally water-absorbing polymer incorporated in inert carrier, notably in anhydrous hydrocarbon solvent used as cushion to separate water when injecting composition into well at ratio water-absorbing polymer to inert carrier between 1:5 and 1:10. Composition may further contain fine hydrophobic material in amount 0.1 to 2.0%. Preparation of composition involves preparation of aqueous solution of indicated exopolysaccharide, addition of starch thereto, and stirring to achieve homogenous mass. Water-absorbing polymer is preliminarily incorporated in inert carrier before aqueous solution of exopolysaccharide with starch is injected. After incorporation of water-absorbing polymer, it can be supplemented by fine hydrophobic material.

EFFECT: enhanced efficiency of insulation operations in high-permeable intervals of washed fissured inhomogeneous formation.

4 cl, 2 tbl, 4 ex