| 摘要 |
FIELD: oil industry. SUBSTANCE: invention is related to development of oil field nonuniform by permeability and oil saturation. Method increasing output of oil field includes injection of biological polymer, gel-forming composition containing aqueous solution of starch and exopolysacharide produced by strain Azotobacter vinelandii ( Lipman ) -1,BKM B-5933 in the form of culture fluid into formation through injection well and uninterrupted injection of aqueous solution of above-mentioned exopolysacharide. Before injection of gel- forming composition share of porous space falling at sections of formation with abnormally high permeability and value of ratio of permeability of channels with abnormally high permeability to average permeability is found. Volume of injected composition is established by formula 'Omega = Vfetaepsilon/psi and volume of aqueous solution of biopolymer is found by formula 'Omega1 = Veta(0,2-0,4)/, where 'Omega is volume of injected biopolymer gel- forming composition, cu m; 'Omega1 is volume of aqueous solution of biopolymer, cu m; V is volume of drainage zone falling at one well, cu m; f is share of porous space falling at sections of formation with abnormally high permeability; epsilon is value of relation of permeability of channels with abnormally high permeability to average permeability of formation; eta - is coverage of interlayer with flooding; psi is value of drop of hydraulic conduction of porous medium after formation of biopolymer gel in it found from equation , where is ratio of fluidity of biopolymer solution to water fluidity chosen from equation = 1+28,6Cexo1-7C2exo1+0,983exo1, where Cst is concentration of exopolysacharide at first stage; Cexo is concentration of starch; Cexo1 concentration of exopolysacharide at second stage. EFFECT: increased coefficient of oil output and saving in materials utilized for biopolymer action on oil-saturated oil fields nonuniform by permeability, enlarged coverage of action. 1 tbl |
