Combination of polyglycerol-10 laurate and an alcohol to reverse the rock wettability of a reservoir

1 . A combination consisting of:

50-99 wt % of polyglycerol-10 laurate; and

1-50 wt % of an alcohol of Formula (I):

wherein:

R 1 and R 2 , identical or different, each represents a hydrogen atom or a saturated, linear or branched, alkyl group comprising from 1 to 4 carbon atoms; and

n is an integer comprised between 1 and 10;

weight percentages being based on the weight of the combination.

2 . The combination according to claim 1 , wherein, in the alcohol of Formula (I), R 2 represents a hydrogen atom or a methyl group.

3 . The combination according to claim 1 , wherein, in the alcohol of Formula (I), R 1 represents a hydrogen atom or a butyl group.

4 . The combination according to claim 1 , wherein the alcohol of Formula (I) is selected from polyethylene glycol 400, monopropylene glycol, and/or butyl glycol.

5 . The combination according to claim 1 , wherein the polyglycerol-10 laurate represents 55-85 wt %, and the alcohol of Formula (I) represents 15-45 wt %, weight percentages being based on the weight of the combination.

6 . A fluid comprising:

at least 0.05 wt % of the combination according to claim 1 ; and

at least 97 wt % of brine;

weight percentages being based on the weight of the fluid.

7 . The fluid according to claim 6 , wherein the combination represents between 0.05 and 3 wt % of the weight of the fluid.

8 . The fluid according to claim 6 , wherein the brine represents between 97 and 99.95 wt % of the weight of the fluid.

9 . The fluid according to claim 6 , further comprising an additive, wherein the additive represents between 0.01 and 2 wt % of the weight of the fluid.

10 . A method for releasing oil from an oil reservoir, comprising introducing the fluid according to claim 6 , through a wellbore into the said oil reservoir.