Compositions For Use In Corrosion Protection

Abstract

The invention relates to compositions, methods and preparation of such compositions to protect metals from corrosion, especially acid corrosion. The compositions of this invention may be added to acids to protect metals from their corrosive influence, particularly at elevated temperatures. These compositions are of particular utility in the oil and gas (petroleum) industry. Also disclosed are “corrosion inhibition intensifiers” to enhance the corrosion inhibition properties of other corrosion inhibitors. Formulations which control ferric ions in acidic solutions are also disclosed. These may be combined with inhibited acids and some compositions provide both corrosion inhibition and ferric ion control.

1 . A composition comprising an acidic solution with a corrosion inhibiting additive, the corrosion inhibiting additive comprising a low water solubility material which is dispersible in an aqueous medium as particles whose surfaces are modified by a surface functionalization agent with a molecular weight of at least 60. 
     
     
         2 . The composition of  claim 1  wherein the low water solubility material comprises a cuprous salt. 
     
     
         3 . The composition of  claim 1 , wherein the surface functionalization agent is selected from at least one of PVP, PVP copolymer, surfactant, an organic acid and a salt of an organic acid. 
     
     
         4 . The composition of  claim 1  where the corrosion inhibiting additive further comprises at least three materials selected from the following categories, wherein at least one material is selected from each of these categories:
 (a) cationic surfactant; 
 (b) phenylpropanoid, and 
 (c) and a material selected from at least one of a monomeric material and a nitrogen containing material. 
 
     
     
         5 . The composition of  claim 2  wherein the corrosion inhibiting additive comprises at least one additional metal compound selected from a Cu compound which is different from the cuprous salt in  claim 2  and compounds of a metal selected from Li, Na, K, V, Co, Mo, Ta, Sn, Bi, Mn and W. 
     
     
         6 . The composition of  claim 1 , wherein the composition further comprises material which provides ferric ion reduction properties. 
     
     
         7 . An additive for an acid solution, to provide the acid solution with corrosion inhibition properties for protecting metals against corrosion when contacted by the acid solution, the additive comprising at least three materials selected from the following categories, wherein at least one material is selected from each of these categories:
 (a) cationic surfactant;   (b) phenylpropanoid, and   (c) and a material selected from at least one of a monomeric material and a nitrogen containing material.   
     
     
         8 . The additive of  claim 7 , wherein the monomer is acetylenic; the phenylpropanoid is cinnamonaldehyde; the nitrogen containing material is selected from quinolines, nicotinic acid, and PVP containing polymer; and the surfactant is a cationic salt selected from ammonium, phosphonium, imidazolium, pyridinium, pyrrolidinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, and triazolium salts containing halide anions. 
     
     
         9 . The additive of  claim 8 , wherein the acetylenic monomer comprises propargyl alcohol or its derivative, the cinnamonaldehyde comprises trans-cinnamonaldehyde, and the cationic salt has at least one alkyl chain with an average length of C12 to C15. 
     
     
         10 . The additive of  claim 8 , further containing a corrosion inhibition intensifier which comprises at least one of a compound of V, Co, Mo, Ta, Sn, Bi, Mn, W, Cu and I. 
     
     
         11 . The additive of  claim 10 , wherein the corrosion inhibition intensifier is selected from CuI, LiI, KI and NaI. 
     
     
         12 . The additive of  claim 8 , further containing components to provide ferric ion reduction properties. 
     
     
         13 . An iron control additive for an acidic solution, wherein the said solution with the additive reduces ferric ion species, and the said additive comprises a reducing agent and a cuprous compound selected from at least one of cuprous halides, cuprous oxide and cuprous acetate. 
     
     
         14 . An additive as in  claim 13 , wherein the said cuprous halide is copper iodide. 
     
     
         15 . An additive as in  claim 13 , wherein the cuprous compound is added as particles whose surfaces are modified by a functionalizing agent. 
     
     
         16 . An additive as in  claim 13 , wherein the reducing agent is a non-sulfur containing material. 
     
     
         17 . An additive to acidic solutions used in the petroleum industry which provides both corrosion inhibition and reduction of ferric ions comprising at least four materials, wherein the said materials are selected from the following categories and at least one material is selected from each of these categories:
 (a) cationic surfactant;   (b) at least one of a monomeric material, a nitrogen containing material.phenylpropanoid;   (c) a reducing agent; and   (d) cuprous compound   
     
     
         18 . An additive as in  claim 17 , wherein the monomer is acetylenic; the phenylpropanoid is cinnamonaldehyde; the nitrogen containing material is selected from quinolines, nicotinic acid, and PVP containing polymer; and the surfactant is a cationic salt selected from ammonium, phosphonium, imidazolium, pyridinium, pyrrolidinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, and triazolium salts containing halide anions. 
     
     
         19 . An additive as in  claim 17 , wherein the reducing agent is a non-sulfur containing material and the cuprous compound is CuI. 
     
     
         20 . An additive as in  claim 17 , wherein the additive further comprises an iodine containing compound.