Microemulsion composition to increase injectivity of water produced in reservoirs

Abstract

The present invention addresses to an oil-in-water microemulsion composition to increase the injectivity of produced water in reservoirs of oil production fields, contemplates a solution that has the potential to reduce the water-oil interfacial tension, to increase the mobility of produced water in the reservoir and to restore the wettability of the reservoir rock.

1 - A MICROEMULSION COMPOSITION TO INCREASE INJECTIVITY OF WATER PRODUCED IN RESERVOIRS, characterized in that it comprises:
 a mixture of one or more surfactants and co-surfactants comprised in a range of values between 1% and 70% by volume, in relation to the total volume of microemulsion;   an oil phase comprised in a range of values between 1% and 50% by volume, in relation to the total volume of microemulsion;   an aqueous phase to complete 100% by volume.   
     
     
         2 - THE COMPOSITION according to  claim 1 , characterized in that the used surfactants are formed by one or more substances chosen from a lauryl alcohol ethoxylate (LAE) and a sodium lauryl ether sulfate (SLES). 
     
     
         3 - THE COMPOSITION according to  claim 1 , characterized in that the co-surfactants used are low molecular weight alcohols, such as n-butanol, sec-butanol, iso-propanol and isoamyl and compounds of the glycol ether family, such as butyl glycol. 
     
     
         4 - THE COMPOSITION according to  claim 1 , characterized in that the oil phase is formed by one or more substances chosen from organic solvents, n-paraffin, kerosene, refined oils and vegetable oils. 
     
     
         5 - THE COMPOSITION according to  claim 1 , characterized in that the aqueous phase used is pure water, saline water, water with neutral, acidic and alkaline pH.