Aqueous solution and method for use thereof

Abstract

An aqueous solution is disclosed including water, an acid, a nitrogen-containing compound, and a functionalizing agent (FA), which can be a ketone, diketone, aldehyde, dialdehyde, organic acid, and combinations thereof. An additional aqueous solution is disclosed including water, an acid, and an acid neutralizing agent which can be a reaction product of at least a portion of the nitrogen-containing compound and the functionalizing agent. Methods of treating a formation are also disclosed including treating a formation fluidly coupled to a wellbore with an oilfield treatment fluid comprising either or both of the aqueous solutions.

That which is claimed: 
     
         1 . An aqueous solution comprising:
 i) water,   ii) an acid,   iii) a nitrogen-containing compound of formula I:   
       
         
           
           
               
               
           
         
         wherein R1 and R2 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and 
         iv) a functionalizing agent (FA) selected from the group consisting of formula II, formula III, formula IV, and combinations thereof: 
       
       
         
           
           
               
               
           
         
         wherein R3 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R4 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, and an aryl group; 
       
       
         
           
           
               
               
           
         
         wherein R5 and R6 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; n ranges from 0 to 3; and 
       
       
         
           
           
               
               
           
         
         wherein R7 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen. 
       
     
     
         2 . The aqueous solution of  claim 1  wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, alkanesulfonic acids, arylsulfonic acids, acetic acid, formic acid, alkyl carboxylic acids, acrylic acid, lactic acid, glycolic acid, malonic acid, fumaric acid, citric acid, tartaric acid, and combinations thereof. 
     
     
         3 . The aqueous solution of  claim 1  wherein the FA is a ketone, diketone, aldehyde, dialdehyde, organic acid, and combinations thereof. 
     
     
         4 . The aqueous solution of  claim 2 , wherein the acid is HCl, the nitrogen-containing compound is urea, and the molar ratio of the FA:nitrogen containing compound is from about 0.1 to about 2. 
     
     
         5 . The aqueous solution of  claim 4 , wherein the molar ratio of the nitrogen-containing compound:acid is from about 0.1 to about 2.4. 
     
     
         6 . An aqueous solution comprising:
 v) water,   vi) an acid, and   vii) an acid neutralizing agent selected from the group consisting of formula V, formula VI, formula VII, and combinations thereof:   
       
         
           
           
               
               
           
         
         wherein R1 and R2 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R3 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R4 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, and an aryl group; R5 and R6 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and R7 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen. 
       
     
     
         7 . The aqueous solution of  claim 6  wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, alkanesulfonic acids, arylsulfonic acids, acetic acid, formic acid, alkyl carboxylic acids, acrylic acid, lactic acid, glycolic acid, malonic acid, fumaric acid, citric acid, tartaric acid, and combinations thereof. 
     
     
         8 . The aqueous solution of  claim 7  wherein the acid neutralizing agent is prepared from the reaction of i) at least a portion of a nitrogen-containing compound of formula I with ii) a functionalizing agent (FA) selected from the group consisting of formula II, formula III, formula IV, and combinations thereof: 
       
         
           
           
               
               
           
         
         wherein R1 and R2 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; 
       
       
         
           
           
               
               
           
         
         wherein R3 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R4 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, and an aryl group; 
       
       
         
           
           
               
               
           
         
         wherein R5 and R6 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; n ranges from 0 to 3; and 
       
       
         
           
           
               
               
           
         
         wherein R7 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen. 
       
     
     
         9 . The aqueous solution of  claim 8  wherein the FA is a ketone, diketone, aldehyde, dialdehyde, organic acid, and combinations thereof. 
     
     
         10 . The aqueous solution of  claim 9 , wherein the acid is HCl, the nitrogen-containing compound is urea, and the molar ratio of the acid neutralizing agent:acid is from about 0.1 to about 1.2. 
     
     
         11 . The aqueous solution of  claim 10 , wherein the aqueous solution does not include an additional acid neutralizing agent. 
     
     
         12 . A method of treating a formation, comprising:
 a) preparing an aqueous solution comprising:
 i) water, 
 ii) acid, 
 iii) a nitrogen-containing compound of formula I: 
   
       
         
           
           
               
               
           
         
         
           
             wherein R1 and R2 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and 
           
           iv) a functionalizing agent (FA) selected from the group consisting of formula II, formula III, formula IV, and combinations thereof: 
         
       
       
         
           
           
               
               
           
         
         
           
             wherein R3 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R4 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, and an aryl group; 
           
         
       
       
         
           
           
               
               
           
         
         
           
             wherein R5 and R6 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; n ranges from 0 to 3; and 
           
         
       
       
         
           
           
               
               
           
         
         wherein R7 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and 
         b) treating a formation fluidly coupled to a wellbore with an oilfield treatment fluid comprising the aqueous solution. 
       
     
     
         13 . The method of  claim 12  wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, alkanesulfonic acids, arylsulfonic acids, acetic acid, formic acid, alkyl carboxylic acids, acrylic acid, lactic acid, glycolic acid, malonic acid, fumaric acid, citric acid, tartaric acid, and combinations thereof 
     
     
         14 . The method of  claim 13 , wherein the acid is HCl, the nitrogen-containing compound is urea, and the molar ratio of the FA:nitrogen containing compound is from about 0.1 to about 2. 
     
     
         15 . The method of  claim 14 , wherein the molar ratio of the nitrogen-containing compound:acid is from about 0.1 to about 2.4. 
     
     
         16 . The method of  claim 15 , wherein the formation comprises a temperature of greater than about 225° F. (107° C.). 
     
     
         17 . A method of treating a formation, comprising:
 a) preparing an aqueous solution comprising:
 i) water, 
 ii) an acid, and 
 iii) an acid neutralizing agent selected from the group consisting of formula V, formula VI, formula VII, and combinations thereof: 
   
       
         
           
           
               
               
           
         
         wherein R1 and R2 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R3 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; R4 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, and an aryl group; R5 and R6 can be the same or different and are each selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and R7 is selected from the group consisting of an alkyl group having from 1 to 6 carbon atoms, a cycloalkyl group, an aryl group, and hydrogen; and 
         b) treating a formation fluidly coupled to a wellbore with an oilfield treatment fluid comprising the aqueous solution. 
       
     
     
         18 . The method of  claim 17  wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, alkanesulfonic acids, arylsulfonic acids, acetic acid, formic acid, alkyl carboxylic acids, acrylic acid, lactic acid, glycolic acid, malonic acid, fumaric acid, citric acid, tartaric acid, and combinations thereof. 
     
     
         19 . The method of  claim 18 , wherein the acid is HCl, the nitrogen-containing compound is urea, and the molar ratio of the acid neutralizing agent:acid is from about 0.1 to about 1.2. 
     
     
         20 . The method of  claim 19 , wherein the molar ratio of the nitrogen-containing compound:acid is from about 0.1 to about 2.4.