METHOD OF PREPARATION OF COMPOSITION FOR ISOLATION OF FORMATION HIGHLY FLOODED-OUT REGIONS Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: method of preparation of composition for isolation of highly flooded-out regions of formation by introduction of bentonite clay into solution with subsequent mixing is distinguished by the fact that solution is used in form of water with ionic force of not in excess of 0.004 mole/l subjected to electrochemical treatment in anode chamber of diaphragm cell up to pH 2.5-3. Bentonite clay is introduced into said solution up to concentration of 25 wt.%, and after mixing solution is diluted with water to concentration of 5 wt.% with ionic force of not in excess of 0.004 mole/l. EFFECT: produced ecologically harmless and economically efficient composition for isolation of formation highly flooded-out regions. 1 tbl, 3 ex