METHOD OF RESTRICTION OF BOTTOM WATER AND ANNULUS OVERFLOWS IN PRODUCTION WELLS Russian patent published in 2009 - IPC E21B33/138 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to methods of restriction of bottom water and annulus overflows in production wells. The method consists in pumping water and solution of sodium naphthenate into a well; then the procedure is repeated not less, than 3 times; also cement solution is pumped with addition of sodium naphthenate; while initially solution of sodium naphthenate and water is pumped and then additionally alumo-chloride is pumped. Volume ratio of sodium naphthenate and alumo-chloride can be 4:1.

EFFECT: upgraded efficiency of method due to effect of hydrophobisation of porous space, increased amount of forming cementing material, thermo-stabilisation of this material under conditions of high temperatures of bed (above 80°C) and creating more reliable isolation screen.

2 cl, 2 tbl, 3 dwg