Enhanced oil recovery methods using a fluid containing a sacrificial agent

Abstract

A method and a system for producing petroleum from a formation utilizing a sacrificial agent and a surfactant are provided. The sacrificial agent reduces the amount of surfactant required to enhance oil recovery from a petroleum-bearing formation. The sacrificial agent is provided in a oil recovery formulation comprising a sacrificial agent and a surfactant dispersed in a fluid. The sacrificial agent is selected from the group consisting of a compound comprising a single carboxylic acid, a single carboxylic acid derivative, or a single carboxylate salt, or a compound lacking a carboxylic acid group, a carboxylate group, a sulfonic acid group, or a sulfonate group that is a pheol, a sulphonamide, or a thiol, or a compound having a molecular weight of 1000 or less that comprises one or more hydroxyl groups. The oil recovery formulation is introduced into a petroleum-bearing formation and petroleum is produced therefrom.

What is claimed is: 
     
         1 . A method comprising:
 providing an oil recovery formulation comprising a fluid, a surfactant dispersed in the fluid, and a sacrificial agent dispersed in the fluid, wherein the sacrificial agent is selected from the group consisting of a compound comprising a single carboxylic acid, a single carboxylic acid derivative, or a single carboxylate salt; a compound lacking a carboxylic acid group, a carboxylate group, a sulfonic acid group, and a sulfonate group that is a phenol, a sulfonamide, or a thiol; a compound having a molecular weight of 1000 or less and comprising one or more hydroxyl groups; and mixtures thereof;   introducing the oil recovery formulation into a petroleum-bearing formation;   contacting the oil recovery formulation with the petroleum-bearing formation and with petroleum in the petroleum-bearing formation; and   producing petroleum from the petroleum-bearing formation after introducing the oil recovery formulation into the petroleum-bearing formation.   
     
     
         2 . The method of  claim 1 , wherein the petroleum-bearing formation is a subterranean formation. 
     
     
         3 . The method of  claim 2 , wherein the oil recovery formulation is introduced into the formation via a first well and the petroleum is produced via a second well. 
     
     
         4 . The method of  claim 3 , further comprising producing at least a portion of the oil recovery formulation from the second well. 
     
     
         5 . The method of  claim 4 , further comprising introducing at least a portion of the produced oil recovery formulation to the subterranean formation. 
     
     
         6 . The method of  claim 1 , wherein the oil recovery formulation further comprises an alkali and a polymer. 
     
     
         7 . The method of  claim 6 , wherein the polymer is selected from the group consisting of polyacrylamides, partially hydrolyzed polyacrylamides, polyacrylates, ethylenic co-polymers, biopolymers, carboxymethylcelloluses, polyvinyl alcohols, polystyrene sulfonates, polyvinylpyrrolidones, AMPS (2-acrylamide-methyl propane sulfonate), and combinations thereof and the alkali is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, lithium bicarbonate, sodium bicarbonate, potassium bicarbonate, lithium silicate, lithium phosphate, sodium silicate, sodium phosphate, potassium silicate, and potassium phosphate, and mixtures thereof. 
     
     
         8 . The method of  claim 1 , wherein the sacrificial agent comprises a monohydroxycarboxylic acid, a dihydroxycarboxylic acid, a trihydroxycarboxylic acid, a tetrahydroxycarboxylic acid, a pentahydroxycarboxylic acid, a salt thereof, or any combination thereof. 
     
     
         9 . The method of  claim 1 , wherein the sacrificial agent comprises 10 carbons or less. 
     
     
         10 . The method of  claim 1 , wherein the sacrificial agent comprises an oxidizable functional group. 
     
     
         11 . The method of  claim 10 , further comprising oxidizing the sacrificial agent while contacting the petroleum-bearing formation. 
     
     
         12 . The method of  claim 1 , wherein the sacrificial agent comprises an enol. 
     
     
         13 . The method of  claim 1 , wherein the sacrificial agent comprises a reductone. 
     
     
         14 . The method of  claim 13 , wherein the sacrificial agent further comprises a carboxylic acid derivative selected from the group consisting of an ester and an amide. 
     
     
         15 . The method of  claim 14 , wherein the sacrificial agent comprises a lactone or a lactam. 
     
     
         16 . The method of  claim 1 , wherein the sacrificial agent comprises a carbohydrate selected from the group consisting of a monosaccharide, a disaccharide, a trisaccharide, a tetrasaccharide, a pentasaccharide, or any combination thereof, wherein the carbohydrate comprises at least one reducing sugar. 
     
     
         17 . The method of  claim 1 , wherein the sacrificial agent is selected from the group consisting of erythorbic acid, ascorbic acid, dehydroerythorbic acid, dehydroascorbic acid, a derivative thereof, or a salt thereof, and any combination thereof. 
     
     
         18 . The method of  claim 1 , wherein the sacrificial agent comprises from 0.001 wt. % to 5 wt. %, or from 0.01 wt. % to 0.5 wt. % of the oil recovery formulation. 
     
     
         19 . The method of  claim 1 , wherein the surfactant is an anionic surfactant. 
     
     
         20 . The method of  claim 19 , wherein the surfactant is selected from the group consisting of an alpha olefin sulfonate compound, an internal olefin sulfonate compound, a branched alkyl benzene sulfonate compound, a propylene oxide sulfate compound, or a blend thereof. 
     
     
         21 . The method of  claim 1 , wherein the surfactant comprises from 0.05 wt. % to 5 wt. %, or from 0.2 wt. % to 1 wt. % of the oil recovery formulation. 
     
     
         22 . The method of  claim 1 , wherein the fluid of the oil recovery formulation is water or an aqueous brine. 
     
     
         23 . A system, comprising:
 an oil recovery formulation comprising a fluid, a surfactant dispersed in the fluid, and a sacrificial agent dispersed in the fluid, wherein the sacrificial agent is selected from the group consisting of a compound comprising a single carboxylic acid, a single carboxylic acid derivative, or a single carboxylate salt; a compound lacking a carboxylic acid group, a carboxylate group, a sulfonic acid group, and a sulfonate group that is a phenol, a sulfonamide, or a thiol; a compound having a molecular weight of 1000 or less and comprising one or more hydroxyl groups; and mixtures thereof;   
       a petroleum-bearing formation; 
       a mechanism for introducing the oil recovery formulation into the petroleum-bearing formation; and 
       a mechanism for producing petroleum from the petroleum-bearing formation subsequent to introduction of the oil recovery formulation into the formation. 
     
     
         24 . The system of  claim 23 , wherein the petroleum-bearing formation is a subterranean formation. 
     
     
         25 . The system of  claim 24 , wherein the mechanism for introducing the oil recovery formulation into the formation is located at a first well, wherein the first well extends into the subterranean formation. 
     
     
         26 . The method of  claim 25 , wherein the mechanism for producing the petroleum from the formation is located at a second well, wherein the second well extends into the subterranean formation. 
     
     
         27 . The method of  claim 23 , wherein the surfactant is an anionic surfactant. 
     
     
         28 . The method of  claim 23 , wherein the oil recovery formulation further comprises a polymer. 
     
     
         29 . The system of  claim 28 , wherein the oil recovery formulation further comprises an alkali. 
     
     
         30 . The system of  claim 23 , wherein the sacrificial agent is selected from the group consisting of erythorbic acid, ascorbic acid, a salt thereof, and any combination thereof.