METHOD OF PRODUCTIVE STRATUM TREATMENT WITH WATER SHUT-OFF AGENT Russian patent published in 2009 - IPC E21B33/00 

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production, particularly to methods of water shut-of execution, and can be used for regulation of filtration streams inside oil stratum during production and well-workout operations. The method includes sequential pumping of hydrochloric acid, fresh water buffer, acrylic polymer solution, fresh water buffer and over flushing mineralised water, keeping well at rest during gelling. Into hydrochloric acid silica-alumina added, chemicals used with the following component ratio, wt %: Silica-alumina 4-12, Hydrochloric acid 8-12. Water is the rest. "Givpan" used as acrylic polymer, which consists of fully hydrolysed polyacrilycnitrited material, chemicals used with the following component ratio, wt %: "Givpan" with content of 6-20% hydrolysed polyacrilycnitrited material 20-100. Water is the rest. Between acid and "givpan" solutions fresh water buffer pumped in with volume which allow to mix "givpan" with other components in bottomhole zone, then water shut-off supplied into stratum.

EFFECT: water shut-off effectiveness increase.

2 cl, 2 tbl, 3 ex