COMPOSITION, METHOD FOR PRODUCING AND APPLICATION OF BLOCKING HYDROPHOBIC EMULSION IN COMBINED WELL KILLING TECHNIQUE Russian patent published in 2008 - IPC C09K8/42 E21B43/12 

FIELD: oil industry.

SUBSTANCE: composition of the blocking hydrophobic emulsion for combined well killing technique contains the hydrocarbon dispersing medium - the diesel fuel 3 or A, continuous phase - the water solution of potassium chloride with density not less than 1450 kg/m³, emulsifying agent - oil asphalt with the softening temperature not less than 75°C, with concentration of the emulsifying agent 60 volume percent and concentration of the dispersing medium 40 volume percent, where concentration of the emulsifying agent is 0.5-1.5 mass percent. The method for producing the specified composition comprises mixing the system by circulating reservoir-pump circuit, dissolution of the emulsifying agent in 1/10 of specified volume of diesel fuel at 90°C and constant stirring till the homogenous solution, and then the received solution is mixed at non-heat condition with the remained part of the diesel fuel, after that, the specified internal phase is dosed gradually into the received hydrocarbon system at stirring, unless the density of 1200 kg/m³ is obtained. In the invented method of application of the blocking hydrophobic emulsion for combined well killing technique, the hydrophobic emulsion of the above specified density is used in the lower part of the combined liquid column overlying the producing formation area, and fresh or mineralised water is used in the upper part of the liquid column; the volume of the hydrophobic emulsion to be injected into the well, is calculated by formula.

EFFECT: application area is broadened and efficiency of combined well killing technique is increased

3 cl, 3 tbl, 1 ex