Claims
- 1. A high density fluid useful for drilling wells with reduced metal corrosion which comprises:
- (A) an aqueous solution of zinc bromide with or without zinc chloride and calcium bromide with or without calcium chloride having a density in the range from about 14.5 to about 21.0 pounds per gallon.
- (B) 50 to 10,000 parts per million of a member of the group consisting of
- (i) an aldehyde having the formula
- R--(CH.sub.2).sub.m --(CH.dbd.CH).sub.n --CHO
- where R is a radical selected from the group consisting of methyl, phenyl, tolyl, and nitrophenyl,
- m is 0 to 7,
- n is 0 or 1, with the proviso that when n is 0, m is 0 to 5,
- (ii) the reaction product of an aldehyde having the formula
- R--(CH.sub.2).sub.m --(CH.dbd.CH).sub.n --(CHO
- where R is a radical selected from the group consisting of methyl, phenyl, tolyl, and nitrophenyl,
- m is 0 to 7,
- n is 0 or 1, with the proviso that when n is 0, m is 0 to 5, with a primary amine having the formula
- R--(CH.sub.2).sub.n --NH.sub.2
- where R is NH.sub.2, OH, CH.sub.3 or phenyl and n is a number from 2 to 6, and
- (C) 250 to 10,000 parts per million of a thiocyanate salt selected from the group consisting of alkali metal thiocyanates and ammonium thiocyante.
- 2. The composition of claim 1 wherein said aldehyde is cinnamaldehyde.
- 3. The composition of claim 1 wherein said primary amine is monoethanolamine.
- 4. The composition of claim 1 wherein said thiocyanate salt is an alkali metal thiocyanate.
- 5. The composition of claim 1 wherein said thiocyanate salt is sodium thiocyanate.
- 6. A high density fluid useful for drilling wells with reduced metal corrosion which comprises:
- (A) an aqueous solution of zinc bromide with or without zinc chloride and calcium bromide with or without calcium chloride having a density in the range from about 14.5 to about 21.0 pounds per gallon,
- (B) 50 to 10,000 parts per million of an aldehyde having the formula
- R--(CH.sub.2).sub.m --(CH.dbd.CH).sub.n --CHO
- where R is a radical selected from the group consisting of methyl, phenyl, tolyl, and nitrophenyl,
- m is 0 to 7,
- n is 0 or 1, with the proviso that when n is 0, m is 0 to 5, and
- (C) 250 to 10,000 parts per million of a thiocyanate salt selected from the group consisting of alkali metal thiocyanates and ammonium thiocyanate.
- 7. The composition of claim 6 wherein said aldehyde is cinnamaldehyde.
- 8. The composition of claim 6 wherein said thiocyanate salt is an alkali metal thiocyanate.
- 9. The composition of claim 6 wherein said thiocyanate salt is sodium thiocyanate.
- 10. A high density fluid useful for drilling wells with reduced metal corrosion which comprises:
- (A) an aqueous solution of zinc bromide with or without zinc chloride and calcium bromide with or without calcium chloride having a density in the range from about 14.5 to about 21.0 pounds per gallon,
- (B) 50 to 10,000 parts per million of the reaction product of an aldehyde having the formula
- R--(CH.sub.2).sub.m --(CH.dbd.CH).sub.n --CHO
- where R is a radical selected from the group consisting of methyl, phenyl, tolyl, and nitrophenyl,
- m is 0 to 7,
- n is 0 or 1, with the proviso that when n is 0, m is 0 to 5, with a primary amine having the formula
- R--(CH.sub.2).sub.n --NH.sub.2
- where R is NH.sub.2, OH, CH.sub.3 or phenyl and n is a number from 2 to 6, and
- (C) 250 to 10,000 parts per million of a thiocyanate salt selected from the group consisting of alkali metal thiocyanates and ammonium tiocyanate.
- 11. The composition of claim 10 wherein said aldehyde is cinnamaldehyde.
- 12. The composition of claim 10 wherein said primary amine is monoethanolamine.
- 13. The composition of claim 10 wherein said thiocyanate salt is an alkali metal thiocyanate.
- 14. The composition of claim 10 wherein said thiocyanate salt is sodium thiocyanate.
- 15. A process for providing high temperature corrosion protection for metals in contact with high density brines in an oil or gas well which comprises providing:
- (A) an aqueous solution of zinc bromide with or without zinc chloride and calcium bromide with or without calcium chloride having a density in the range from about 14.5 to about 21.0 pounds per gallon,
- (B) 50 to 10,000 parts per million of a member of the group consisting of
- (i) an aldehyde having the formula
- R--CH.dbd.CH--CHO
- where R is a radical selected from the group consisting of phenyl, tolyl, and nitrophenyl, and
- (ii) the reaction product of an aldehyde having the formula
- R--(CH.sub.2).sub.m --(CH.dbd.CH).sub.n --CHO
- where R is a radical selected from the group consisting of methyl, phenyl, tolyl, and nitrophenyl,
- m is 0 to 7,
- n is 0 or 1, with the proviso that when n is 0, m is 0 to 5, with a primary amine having the formula
- R--(CH.sub.2).sub.n --NH.sub.2
- where R is NH.sub.2, OH, CH.sub.3 or phenyl and n is a number from 2 to 6, and
- (C) 250 to 10,000 parts per million of a thiocyanate salt selected from the group consisting of alkali metal thiocyanates and ammonium thiocyanate.
- 16. The process of claim 15 wherein said aldehyde is cinnamaldehyde.
- 17. The process of claim 15 wherein said amine is monoethanolamine.
- 18. The process of claim 15 wherein said thiocyanate salt is an alkali metal thiocyanate.
- 19. The process of claim 15 wherein said thiocyanate salt is sodium thiocyanate.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of Ser. No. 921,920 filed Oct. 22, 1986 now abandoned and a continuation-in-part of Ser. No. 135,416 filed Dec. 21, 1987, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2027686 |
Feb 1980 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Hudgins et al., in The Oil And Gas Journal, Jul. 24, 1961, pp. 91-96. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
921920 |
Oct 1986 |
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