METHOD FOR INCREASING OIL RECOVERY FROM OIL DEPOSIT

• Main Authors: VLASOV S.A, BALAKIN V.V, KAGAN JA.M, ZANKIEV M.JA, KRASNOPEVTSEVA N.V, KUDRJASHOV B.M, ALAFINOV S.V, FOMIN A.V
• Format: Patent
• Language: English
• Published: 27.01.1999
• Edition: 6
• Subjects: ADHESIVES; BEER; BIOCHEMISTRY; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ENZYMOLOGY; FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MICROBIOLOGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MUTATION OR GENETIC ENGINEERING; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES; SPIRITS; VINEGAR; WINE

FIELD: oil production industry. SUBSTANCE: according to method, injected into oil bed is water solution of starch produced by Axotobacter vinelandii (Lipman) in the form of pure-culture liquid. Ratio of components is as follows, %: exopolysaccharide - 0.005-0.1, starch - 1.0-5.0, water - the balance. Injection is carried out in three stages: initially injected into bed is fringe of water solution of exopolysaccharide with concentration of 0.1-2.0% at injection pressure which by 5-15% is below pressure in line of maintaining bed pressure. Then continuously injected is water solution of starch and exoplysaccharide at pressure of injection in first stage. After restoring injectivity of well being treated undertaken is continuous injection of water solution of first stage at pressure which is equal to pressure in line of maintaining bed pressure. Application of aforesaid method endures levelling of injectivity profile and increasing specific technological efficiency. EFFECT: higher efficiency. 1 tbl, 5 dwg, 5 ex