Methods for Stimulating Oil or Gas Production Using a Viscosified Aqueous Fluid with a Chelating Agent to Remove Calcium Carbonate and Similar Materials from the Matrix of a Formation or a Proppant Pack

Abstract

Methods for treating a subterranean formation can comprise introducing a treatment fluid comprising dicarboxymethyl glutamic acid (GLDA) or a salt thereof into a subterranean formation, and at least partially removing an iron-containing material in the subterranean formation using the GLDA. Treatment fluids used in the methods may have a pH equal to or greater than about 2.

1 .- 27 . (canceled) 
     
     
         28 . A method comprising:
 introducing a treatment fluid comprising dicarboxymethyl glutamic acid (GLDA) or a salt thereof into a subterranean formation; and   at least partially removing an iron-containing material in the subterranean formation using the GLDA.   
     
     
         29 . The method of  claim 28 , wherein the pH of the treatment fluid is equal to or greater than about 2. 
     
     
         30 . The method of  claim 28 , wherein the pH of the treatment fluid is equal to or greater than about 5. 
     
     
         31 . The method of  claim 28 , wherein the pH of the treatment fluid is between about 6 and about 12. 
     
     
         32 . The method of  claim 28 , wherein the treatment fluid further comprises water. 
     
     
         33 . The method of  claim 32 , wherein the GLDA is present in the treatment fluid at a concentration between about 1% and about 80% by weight of the water. 
     
     
         34 . The method of  claim 32 , wherein the treatment fluid further comprises a surfactant. 
     
     
         35 . The method of  claim 32 , wherein the treatment fluid further comprises a component selected from the group consisting of a surfactant, a water-soluble inorganic salt, a water-soluble inorganic salt replacement, a viscosity-increasing agent, a crosslinking agent, a breaker, a delayed release breaker, an enzyme, an oxidizer, an additive for foaming, a gas, and any combination thereof. 
     
     
         36 . The method of  claim 28 , wherein the iron-containing material comprises an iron-containing scale. 
     
     
         37 . The method of  claim 36 , wherein the iron-containing scale comprises an iron-containing compound selected from the group consisting of iron carbonate, iron sulfide, iron oxides, and any combination thereof. 
     
     
         38 . The method of  claim 28 , wherein the iron-containing material is present in a proppant pack. 
     
     
         39 . The method of  claim 28 , wherein the iron-containing material is present in fracture. 
     
     
         40 . A method comprising:
 introducing a treatment fluid comprising dicarboxymethyl glutamic acid (GLDA) or a salt thereof into a subterranean formation; and   at least partially removing a scale in the subterranean formation using the GLDA.   
     
     
         41 . The method of  claim 40 , wherein the pH of the treatment fluid is equal to or greater than about 2. 
     
     
         42 . The method of  claim 40 , wherein the pH of the treatment fluid is equal to or greater than about 5. 
     
     
         43 . The method of  claim 40 , wherein the pH of the treatment fluid is between about 6 and about 12. 
     
     
         44 . The method of  claim 40 , wherein the treatment fluid further comprises water. 
     
     
         45 . The method of  claim 44 , wherein the GLDA is present in the treatment fluid at a concentration between about 1% and about 80% by weight of the water. 
     
     
         46 . The method of  claim 44 , wherein the treatment fluid further comprises a surfactant. 
     
     
         47 . The method of  claim 44 , wherein the treatment fluid further comprises a component selected from the group consisting of a surfactant, a water-soluble inorganic salt, a water-soluble inorganic salt replacement, a viscosity-increasing agent, a crosslinking agent, a breaker, a delayed release breaker, an enzyme, an oxidizer, an additive for foaming, a gas, and any combination thereof.