DEVELOPMENT METHOD OF NON-HOMOGENEOUS OIL FORMATION WITH USE OF POLYMER-DISPERSED COMPOSITION Russian patent published in 2017 - IPC E21B43/22 C09K8/60 

FIELD: oil and gas industry.

SUBSTANCE: in a development method of non-homogeneous oil formation comprising injecting an aqueous polymer dispersion containing polyacrylamide-PAA, a cross-linking agent and a micro-reinforcing additive into the well, and squeezing it to the formation with water, a polymer composition containing, wt %: partially hydrolysed PAA 12.00-17.00, microsilica or microcalcite is the rest, chromium (III) acetate or a cross-linking composition is used as a cross-linking agent, wt %: chrome (III) acetate 2.00-10.00 and 20.0-23.0% hydrochloric acid is the rest, the noted composition being obtained by introducing into the water of fresh or mineralized water with a density of up to 1.012 g/cm³ of the noted polymer composition containing microsilica, while stirring it to complete hydration of the PAA and then introducing a chromium (III) acetate crosslinking agent or the noted cross-linking composition upon pumping into the well, with the following component ratio, wt %: the noted polymeric composition containing microsilica 1.0-7.0, chromium (III) acetate 0.01-0.1 or the noted cross-linking composition 0.5-1.5, the noted water is the rest, or introducing into the water of fresh or mineralized water with a density of up to 1.012 g/cm³ of the noted polymeric composition containing a microcalcite, while stirring it to complete hydration of the PAA and then introducing a chromium (III) acetate crosslinking agent upon pumping into the well, at the following component ratio, wt %: the noted polymer composition containing a microcalcite of 1.0-7.0, chromium (III) acetate 0.01-0.1, the noted water is the rest.

EFFECT: increased homogeneity of the composition and provided possibility of adjusting the cross-linking time.

2 tbl, 9 ex