Back to results
US 6,866,797 B1Granted
Corrosion inhibitors and methods of use
AssigneeBJ Services Company
InventorsRichard L. Martin, Gene F. Brock, James B. Dobbs
Life of this patent
Estimating the term…
Abstract
A class of quaternary ammonium compounds are found to be effective as corrosion inhibitors. These quaternary ammonium compounds may be used alone or in combination with additional components. For example, phosphate esters can be used with the quaternary ammonium compounds. Moreover, thiocarbonyl compounds can also be added to the corrosion inhibitor compositions. These corrosion inhibitors are effective against ferrous metal corrosion, especially under downhole conditions.
Claims34
A composition, comprising:
- a quaternary ammonium compound of formula (I)
- and a phosphate ester of formula (II);
- wherein R1, R2, R3, R4 are independently a hydrocarbyl group;
- X− is selected from the group consisting of halide and sulfate;
- and
- R5, R6, and R7 are independently selected from the group consisting of hydrogen, a hydrocarbyl group, and a polyoxyalkylated alcohol;
- and
- further comprising a thiocarbonyl compound of formula (III)
- wherein R8 is selected from the group consisting of metal ion, ammonium ion, hydrocarbyl, and heterohydrocarbyl;
- X and Y are independently selected from the group consisting of oxygen and sulfur such that at least one of X and Y is sulfur;
- Z is selected from the group consisting of OR9 and NR10R11;
- and
- R9, R10, and R11 are independently selected from the group consisting of hydrocarbyl and heterohydrocarbyl.
10 more elements
A composition, comprising:
- a quaternary ammonium compound of formula (I)
- wherein R1, R2, R3, R4 are independently a hydrocarbyl group;
- a phosphate ester of formula (II);
- wherein X− is selected from the group consisting of halide and sulfate;
- and
- R5, R6, and R7 are independently selected from the group consisting of hydrogen, a hydrocarbyl group, and a polyoxyalkylated alcohol;
- and
- a thiocarbonyl compound of formula (III);
- wherein R8 is selected from the group consisting of metal ion, ammonium ion, hydrocarbyl, and heterohydrocarbyl;
- X and Y are selected from the group consisting of oxygen and sulfur, such that at least one of X and Y is sulfur;
- and
- R10 and R11 are independently selected from the group consisting of hydrocarbyl and heterohydrocarbyl.
9 more elements
A method of making a corrosion inhibitor, comprising:
- combining a quaternary ammonium compound of formula (I)
- with a phosphate ester of formula (II)
- and further with a thiocarbonyl compound of formula (III)
- wherein R1, R2, R3, R4 are independently a hydrocarbyl group;
- X− is selected from the group consisting of halide and sulfate;
- R5, R6, and R7 are independently selected from the group consisting of hydrogen, a hydrocarbyl group, and a polyoxyalkylated alcohol;
- R8 is selected from the group consisting of metal ion, ammonium ion, hydrocarbyl, and heterohydrocarbyl;
- X and Y are independently selected from the group consisting of oxygen and sulfur such that at least one of X and Y is sulfur;
- Z is selected from the group consisting of OR9 and NR10R11;
- and
- R9, R10, and R11 are independently selected from the group consisting of hydrocarbyl and heterohydrocarbyl.
8 more elements
Dependencies are inferred from the claim text.