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US 7,427,584 B2Granted
Treating composition
AssigneeSchlumberger Technology Corporation
InventorsWayne Frenier, Mark Brady
Life of this patent
Estimating the term…
Abstract
Treating compositions containing mutual solvents suitable for forming and maintaining single-phase aqueous fluid treating compositions containing very high concentrations of acids and/or chelating agents are described. Methods of use of these treating compositions for dissolving and removing scale and formation matrix material in oil-field treatments such as stimulation and remediation are given.
Claims24
A treating composition comprising:
- a first component selected from the group consisting of an aminopolycarboxylic acid chelating agent selected from the group consisting of ethylenediamine tetraacetic acid (EDTA), hydroxyethylethylenediamine triacetic acid (HEDTA), diethylenetriamine pentaacetic acid (DTPA), hydroxyethyliminodiacetic acid (HEIDA), nitrilotriacetic acid (NTA), and their K, Na, NH4 or amine salts, and mixtures thereof, wherein said chelating agent is present in an amount of from 20% to 30% by weight of said composition;
- and mixtures of said aminopolycarboxylic acid chelating agents with an acid selected from the group consisting of hydrochloric, sulfuric, phosphoric, hydrofluoric, formic, acetic, boric, citric, malic, tartaric, and maleic acids and mixtures thereof;
- and
- a mutual solvent selected from the group of compounds having a first formula:
- R1—O—CH2—CH2—O—R2
- wherein in said first formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, or ethyl provided that R1 and R2 are not both hydrogen and provided that the total number of carbons in both R1 and R2 is not more than 2, a second formula:
- R1—O—CH2—CH2—O—CH2—CH2—O—R2
- wherein in said second formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, or ethyl provided that R1 and R2 are not both hydrogen, a third formula:
- R1—O—CH2—CH(CH3)—O—R2
- wherein in said third formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, propyl or butyl provided that if R1 is acrylate, ethyl, propyl or butyl then R2 is hydrogen and provided that, if the first component comprises an aminopolycarboxylic acid chelating agent as the only acid, R1 is hydrogen and R2 is methyl or acetate, and a fourth formula:
- R1—O—CH2—CH(CH3)—O—CH2—CH(CH3)—O—R2
- wherein in said fourth formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, or propyl provided that if R1 is propyl then R2 is hydrogen and provided that, if the first component comprises an aminopolycarboxylic acid chelating agent as the only acid, R1 is hydrogen and R2 is methyl or acetate;
- and mixtures thereof.
10 more elements
A treating composition comprising:
- a first component selected from the group consisting of an acid combination comprising citric acid, hydrofluoric acid, and boric acid and a mixture of this acid combination with an aminopolycarboxylic acid chelating agent selected from the group consisting of ethylenediamine tetraacetic acid (EDTA), hydroxyethylethylenediamine triacetic acid (HEDTA), diethylenetriamine pentaacetic acid (DTPA), hydroxyethyliminodiacetic acid (HEIDA), nitrilotriacetic acid (NTA), and their K, Na, NH4 or amine salts, and mixtures thereof, wherein said chelating agent is present in an amount of from 20% to 30% by weight of said composition;
- and
- a mutual solvent selected from the group of compounds having a first formula:
- R1—O—CH2—CH2—O—R2
- wherein in said first formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, or ethyl provided that R1 and R2 are not both hydrogen and provided that the total number of carbons in both R1 and R2 is not more than 2, a second formula:
- R1—O—CH2—CH2—O—CH2—CH2—O—R2
- wherein in said second formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, or ethyl provided that R1 and R2 are not both hydrogen, a third formula:
- R1—O—CH2—CH(CH3)—O—R2
- wherein in said third formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, propyl or butyl provided that if R1 is acrylate, ethyl, propyl or butyl then R2 is hydrogen and provided, if the first component comprises an aminopolycarboxylic acid chelating agent, that R1 is hydrogen and R2 is methyl or acetate, and a fourth formula:
- R1—O—CH2—CH(CH3)—O—CH2—CH(CH3)—O—R2
- wherein in said fourth formula R1 and R2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, or propyl provided that if R1 is propyl then R2 is hydrogen and provided that, if the first component comprises an aminopolycarboxylic acid chelating agent, R1 is hydrogen and R2 is methyl or acetate;
- and mixtures thereof.
9 more elements
Dependencies are inferred from the claim text.