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 comprising a carbonate mineral, and at least partially dissolving the carbonate mineral in the subterranean formation using the GLDA. Treatment fluids containing GLDA or a salt thereof may be used to increase the permeability of a subterranean formation.

1 .- 27 . (canceled) 
     
     
         28 . A method comprising:
 introducing a treatment fluid comprising dicarboxymethyl glutamic acid (GLDA) or a salt thereof into a subterranean formation comprising a carbonate mineral; and   at least partially dissolving the carbonate mineral 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 carbonate mineral comprises a carbonate selected from the group consisting of calcium carbonate, magnesium carbonate, dolomite, iron carbonate, and any combination thereof. 
     
     
         37 . The method of  claim 28 , wherein the carbonate mineral comprises calcium carbonate. 
     
     
         38 . The method of  claim 28 , wherein the carbonate mineral is present in a proppant pack. 
     
     
         39 . The method of  claim 28 , wherein the carbonate mineral 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;   interacting the treatment fluid with the subterranean formation; and   increasing the permeability of the subterranean formation with the treatment fluid.   
     
     
         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 40 , wherein the subterranean formation contains a carbonate mineral.