DEVELOPMENT METHOD OF NON-HOMOGENEOUS OIL FORMATION (VERSIONS) Russian patent published in 2014 - IPC E21B43/22 C09K8/84 

FIELD: oil and gas industry.

SUBSTANCE: method for development of non-homogeneous oil formation, including pumping in formation through an injection well of aluminium saline and alkaline agent and oil extraction through producing wells, prior to pumping in formation, on the wellhead Colloidal Dispersed System (CDS) is made with concentration from 1.5 to 50.0% by weight and pH 6.70-8.75 by simultaneous dosing of 0.5-10% aluminium saline solution and 1.0-20% alkaline agent solution in water with the following ratio of components, wt %: aluminium saline - 0.05-3.0, alkaline agent - 0.1-6.0, water - remaining, the specified solutions are mixed with water in a mixing capacity during 10-30 min, then obtained CDS is pumped in formation in continuous mode till decrease of specific injection capacity of the well by 5-30% and reaching pumping pressure not exceeding the maximum allowed pressure of a producing string or productive formations, and squeezed into formation with water. In the method for development of non-homogeneous oil formation by another version, including pumping in formation through an injection well of aluminium saline and alkali agent and oil extraction through producing wells, prior to pumping in formation, on the wellhead CDS is made with concentration from 1.5 to 50.0% by weight and pH 6.70-8.75 with simultaneous dosing of powder agents of aluminium saline and alkali agent in water with the following ratio of components, wt %: aluminium saline - 0.05-3.0, alkali agent - 0.1-6.0, water - remaining; the specified components are mixed with water in a mixing capacity during 10-30 min. Then, obtained CDS is pumped in formation in continuous mode till decrease of specific injection capacity of the well by 5-30% and reaching pumping pressure not exceeding the maximum allowed pressure of a producing string or productive formations, and squeezed into formation with water. The invention is developed in the secondary claims.

EFFECT: increased oil withdrawal of formations, reduced watering of producing wells, higher efficiency of formation cover with stimulation, expanded technological capabilities of the method.

6 cl, 47 ex