Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2020018080 - DISSOLUTION DE TARTRE DE SULFATE MÉTALLIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A method of removing metal sulfate scale, the method comprising:

introducing a treatment fluid into a wellbore comprising metal sulfate scale, wherein the treatment fluid comprises:

a phosphonated aminocarboxylate;

a carboxylated alkanol, a carboxylated alkyl halide, and/or a multicarboxylic acid;

an anion; and

an aqueous base fluid; wherein the treatment fluid has a pH in a range between about 7 to about 13;

contacting the metal sulfate scale with the treatment fluid.

2. The method of claim 1, wherein the phosphonated aminocarboxylate is a phosphonated aminocarboxylate selected from the group consisting of /V-Phosphonomethyl iminodiacetic acid, methylenephosphonic acid, /V./V-bis(phosphonomethyl /glycine: phosphonobutanetricarboxylic acid, 2-carboxyethyl phosphonic acid, 2-hydroxyphosphonocarboxylic acid, salts thereof, hydrates thereof, acids thereof, esters thereof, derivatives thereof, and any combination thereof.

3. The method of claim 1, wherein the carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid is a carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid selected from the group consisting of glycolic acid, mandelic acid, lactic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, bromoacetic acid, fluoroacetic acid, citric acid, tartaric acid, salts thereof, esters thereof, hydrates thereof, derivatives thereof, and any combination thereof.

4. The method of claim 1, wherein the anion is an anion selected from the group consisting of a halide, an alkanol amine, a trialkylamine, a polyamine, an oxoanion, an anionic surfactant, derivatives thereof, and any combination thereof.

5. The method of claim 1, wherein the treatment fluid further comprises carbonate or bicarbonate.

6. The method of claim 1, wherein the treatment fluid does not comprise carbonate or bicarbonate.

7. The method of claim 1, wherein the metal sulfate scale is a calcium sulfate scale.

8. The method of claim 1, wherein the pH of the treatment fluid is in a range between about 8.5 to about 10.

9. The method of claim 1, wherein the treatment fluid is allowed to remain static during the contacting for a time period of four hours or less.

10. The method of claim 1, wherein the treatment fluid is allowed to remain static during the contacting for a time period of two hours or less and wherein 80% of more of the metal sulfate scale is dissolved during the time period.

11. The method of claim 1, wherein the metal sulfate scale is dissolved in the treatment fluid without conversion of the metal sulfate scale to a metal carbonate scale.

12. A treatment fluid comprising:

a phosphonated aminocarboxylate;

a carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid; an anion; and

an aqueous base fluid; wherein the treatment fluid has a pH in a range between about 7 to about 13.

13. The treatment fluid of claim 12, wherein the phosphonated aminocarboxylate is a phosphonated aminocarboxylate selected from the group consisting of /V-Phosphonomethyl iminodiacetic acid, methylenephosphonic acid, /VJV-bis(phosphonomethyl /glycine: phosphonobutanetricarboxylic acid, 2-carboxyethyl phosphonic acid, 2-hydroxyphosphonocarboxylic acid, salts thereof, hydrates thereof, acids thereof, ester thereofs, any derivative thereof, and any combination thereof.

14. The treatment fluid of claim 12, wherein the carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid is a carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid selected from the group consisting of glycolic acid, mandelic acid, lactic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, bromoacetic acid, fluoroacetic acid, citric acid, tartaric acid, salts thereof, esters thereof, hydrates thereof, derivatives thereof, and any combination thereof.

15. The treatment fluid of claim 12, wherein the anion is an anion selected from the group consisting of a halide, an alkanol amine, a trialkylamine, a polyamine, an oxoanion, an anionic surfactant, derivatives thereof, and any combination thereof.

16. The treatment fluid of claim 12, wherein the treatment fluid does not comprise carbonate or bicarbonate.

17. A system for removing metal sulfate scale from a wellbore, the system comprising: a treatment fluid comprising:

a phosphonated aminocarboxylate;

a carboxylated alkanol, carboxylated alkyl halide, and/or a multicarboxylic acid; an anion; and

an aqueous base fluid; wherein the treatment fluid has a pH in a range between about 7 to about 13;

mixing equipment configured to mix the phosphonated aminocarboxylate, the carboxylated alkanol, and/or the multicarboxylic acid, the anion, and the aqueous base fluid to provide the treatment fluid; and

pumping equipment configured to pump the treatment fluid into the wellbore to a location comprising the metal sulfate scale.

18. The system of claim 17, wherein the pumping equipment is configured to not circulate the treatment fluid during a reaction time in which the treatment fluid is contacting the metal sulfate scale.

19. The system of claim 17, wherein the phosphonated aminocarboxylate is a phosphonated aminocarboxylate selected from the group consisting of /V-Phosphonomethyl iminodiacetic acid, methylenephosphonic acid, /V,/V-bis(phosphonomethyl)glycine; phosphonobutanetricarboxylic acid, 2-carboxyethyl phosphonic acid, 2-hydroxyphosphonocarboxylic acid, salts thereof, hydrates thereof, acids thereof, ester thereofs, any derivative thereof, and any combination thereof.

20. The system of claim 17, wherein the treatment fluid does not comprise carbonate or bicarbonate.