Compositions, systems, and methods for iron sulfide scale identification, prevention, and reduction

Patent metadata

Field	Value
Publication number	US-2021355809-A1
Application number	US-202016875613-A
Country	US
Kind code	A1
Filing date	May 15, 2020
Priority date	May 15, 2020
Publication date	Nov 18, 2021
Grant date	—

Abstract

Compositions and methods for prevention and reduction of iron sulfide scale formation, one method including detecting at least one component indicative of an iron sulfide scale precursor, the at least one component selected from the group consisting of: H2S; HS−; S2−; Sn2−; FeS(aq); Fe2+; Fe3+, and combinations of the same; preparing a composition to react with the iron sulfide scale precursor, the composition comprising at least one compound selected from the group consisting of: a methylating agent; a metal operable to react with sulfide species; a compound to increase the oxidation state of Fe2+; and combinations of the same; and applying the composition to the iron sulfide scale precursor to consume the iron sulfide scale precursor.

First claim

That claimed is:

1 . A method for prevention and reduction of iron sulfide scale formation, the method comprising the steps of:
detecting at least one component indicative of an iron sulfide scale precursor, the at least one component selected from the group consisting of: H 2 S; HS − ; S 2− ; S n 2− ; FeS (aq) ; Fe 2+ ; Fe 3+ ; and combinations of the same; preparing a composition to react with the iron sulfide scale precursor, the composition comprising at least one compound selected from the group consisting of: a methylating agent; a metal operable to react with sulfide species; a compound to increase the oxidation state of Fe 2+ ; and combinations of the same; and applying the composition to the iron sulfide scale precursor to consume the iron sulfide scale precursor.

2 . The method according to claim 1 , wherein the step of detecting comprises the use of a solid state glass Au-amalgam electrode comprising activated carbon particles.

3 . The method according to claim 2 , wherein the Au-amalgam electrode comprises a gold wire about 100 μm in diameter.

4 . The method according to claim 3 , further comprising the use of a Pt counter electrode, and a Ag/AgCl reference electrode with the Au-amalgam electrode.

5 . The method according to claim 1 , wherein the composition comprises the methylating agent, the metal operable to react with sulfide species; and the compound to increase the oxidation state of Fe 2+ .

6 . The method according to claim 5 , wherein the methylating agent comprises methyl trifluoromethanesulfonate, the metal comprises zinc, and the compound to increase the oxidation state of Fe 2+ comprises chlorine.

7 . The method according to claim 1 , wherein the step of preparing comprises mixing methyl trifluoromethanesulfonate with copper chloride and zinc acetate.

8 . The method according to claim 7 , wherein the molar ratio of methyl trifluoromethanesulfonate to zinc acetate is about 1:1 and the molar ratio of methyl trifluoromethanesulfonate to copper chloride is about 10:1.

9 . The method according to claim 7 , wherein the step of mixing includes the use of an organic solvent.

10 . The method according to claim 9 , wherein the organic solvent comprises ethanol.

11 . The method according to claim 1 , wherein before the step of applying the composition is cooled to below room temperature.

12 . The method according to claim 1 , further comprising the step of applying voltammetry to verify a decrease of concentration in at least one component selected from the group consisting of: H 2 S; HS − ; S 2− ; S n 2− ; FeS (aq) ; Fe 2+ ; and combinations of the same, or to verify an increase in concentration of Fe 3+ .

13 . The method according to claim 1 , further comprising the step of applying the composition to reduce the formation of a compound selected from the group consisting of: PbS, ZnS, HgS, and combinations of the same.

14 . The method according to claim 1 , where the step of applying the composition to the iron sulfide scale precursor to consume the iron sulfide scale precursor comprises applying the composition in a batch of about 3 barrels to about 5 barrels to a wellbore proximate a hydrocarbon-bearing formation every about 30 to about 45 days.

15 . A composition for prevention and reduction of iron sulfide scale formation, the composition comprising:
a methylating agent; a metal operable to react with sulfide species; and a compound to increase the oxidation state of Fe 2+ , where at least one of the methylating agent, the metal, and the compound to increase the oxidation state of Fe 2+ react with at least one component selected from the group consisting of: H 2 S; HS − ; S 2− ; Sr; FeS (aq) ; Fe 2+ ; and combinations of the same.

16 . The composition according to claim 15 , wherein the methylating agent comprises methyl trifluoromethanesulfonate, the metal comprises zinc, and the compound to increase the oxidation state of Fe 2+ comprises chlorine.

17 . The composition according to claim 15 , wherein the composition comprises methyl trifluoromethanesulfonate, copper chloride, and zinc acetate.

18 . The composition according to claim 17 , wherein the molar ratio of methyl trifluoromethanesulfonate to zinc acetate is about 1:1 and the molar ratio of methyl trifluoromethanesulfonate to copper chloride is about 10:1.

19 . The composition according to claim 17 , wherein the composition further comprises an organic solvent.

20 . The composition according to claim 19 , wherein the organic solvent comprises ethanol.

21 . The composition according to claim 15 , wherein the composition consists essentially of methyl trifluoromethanesulfonate, copper chloride, and zinc acetate.

22 . The composition according to claim 15 , wherein the composition consists of methyl trifluoromethanesulfonate, copper chloride, and zinc acetate.

23 . A method for producing a solid state glass gold-amalgam electrode, the method comprising the steps of:
disposing a wire comprising gold in and through a high-temperature glass electrode body to expose a portion of the wire external to the high-temperature glass electrode body for detecting electrical current, the exposed portion of the wire located proximate mercury; and encasing a portion of the wire proximate the exposed portion with an epoxy resin containing gold and carbon particles.

24 . The method according to claim 23 , wherein the high-temperature glass electrode body comprises borosilicate glass.

25 . The method according to claim 23 , further comprising the step of detecting at least one component indicative of an iron sulfide scale precursor, the at least one component selected from the group consisting of: H 2 S; HS − ; S − ; S n 2− ; FeS (aq) ; Fe 2+ ; Fe 3+ ; and combinations of the same.

26 . The method according to claim 25 , further comprising the steps of preparing a composition to react with the iron sulfide scale precursor, the composition comprising at least one compound selected from the group consisting of: a methylating agent; a metal operable to react with sulfide species; a compound to increase the oxidation state of Fe 2+ ; and combinations of the same; and applying the composition to the iron sulfide scale precursor to consume the iron sulfide scale precursor.

27 . The method according to claim 23 , further comprising the steps of:
pulverizing activated carbon;
combining the pulverized activated carbon with gold; and
combining the pulverized activated carbon and gold with ultra-high temperature epoxy resin stable up to about 600° F. to form the epoxy resin containing gold and carbon particles.

28 . The method according to claim 27 , further comprising the steps of:
acidifying the pulverized activated carbon;
combining the pulverized activated carbon with a stabilizing functionalized amine; and
sonicating the pulverized activated carbon and gold with ultra-high temperature epoxy resin stable up to about 600° F., wherein the step of combining the pulverized activated carbon with gold comprises the use of chloroauric acid.

29 . The method according to claim 27 , wherein the pulverized activated carbon comprises particles with a median particle size between about 5 μm to about 10 μm and the gold comprises particles with a median particle size between about 2 nm to about

Assignees

• Saudi Arabian Oil Co

Inventors

• Oduro Harry Daniel

Classifications

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C09K8/532 Primary

  Sulfur · CPC title

• C09K8/528

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09K8/54

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title