Diphenyliodonium salts as sulfidogenesis inhibitors and antimicrobials

Abstract

The present invention generally relates to the use of diphenyliodonium salts for lowering sulfide concentrations and for preventing growth of microbes in a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system. Treating oilfield injection and produced fluids containing high levels of microbes with diphenyliodonium salts can significantly decrease the amount of hydrogen sulfide produced, which can be used to measure sulfidogenesis. The treatment can also decrease the number of microbes in the injection and produced fluids. Thus, these diphenyliodonium salts can be effectively used as inhibitors of hydrogen sulfide generation and as biocides in oilfield fluids.

Claims

1. A method for reducing or preventing growth of a microbe in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system comprising administering an effective amount of a diphenyliodonium salt into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system.

2. The method of claim 1 wherein the diphenyliodonium salt is administered by injecting an injection fluid into the hydrocarbon extraction system or the hydrocarbon production system.

3. The method of claim 1 wherein the hydrocarbon extraction system or the hydrocarbon production system is a subterranean hydrocarbon-containing formation, a well, a pipeline, a fluid separation vessel, a floating production storage vessel, an offloading vessel, a refinery, or a storage system.

4. The method of claim 3 wherein the hydrocarbon extraction system or the hydrocarbon production system is a subterranean hydrocarbon-containing formation.

5. The method of claim 1 further comprising administering a biocide, administering a calcium nitrate/perchlorate agent, removing sulfate, administering a preservative agent, or a combination thereof.

6. The method of claim 1 wherein the injection fluid comprises seawater, produced water, fresh water, brackish water, drilling fluid, completion fluid, or a combination thereof.

7. The method of claim 1 wherein the microbe comprises a sulfur utilizing prokaryote.

8. The method of claim 1 wherein the diphenyliodonium salt is injected into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system continuously with the injection fluid.

9. The method of claim 1 wherein the diphenyliodonium salt is injected into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system intermittently with the injection fluid.

10. A method for reducing concentration of hydrogen sulfide in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a production system comprising administering an effective amount of a diphenyliodonium salt into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system, wherein the diphenyliodonium salt inhibits the production of hydrogen sulfide by a sulfur utilizing prokaryote by reducing or preventing growth of the sulfur-utilizing prokaryote.

11. The method of claim 10 wherein the sulfur utilizing prokaryote produces sulfide through reduction of sulfate, thiosulfate, sulfur, bisulfite, an organosulfur compound, or a combination thereof.

12. The method of claim 10 wherein the diphenyliodonium salt is diphenyliodonium chloride, diphenyliodonium nitrate, diphenyliodonium bromide, diphenyliodonium iodide, diphenyliodonium hexafluorophosphate, diphenyliodonium perchlorate, diphenyliodonium hexafluoroarsenate, or a combination thereof.

13. The method of claim 12 wherein the diphenyliodonium salt is diphenyliodonium chloride, diphenyliodonium nitrate, or a combination thereof.

14. The method of claim 12 wherein the diphenyliodonium salt comprises diphenyliodonium chloride.

15. The method of claim 12 wherein the diphenyliodonium salt comprises diphenyliodonium nitrate.

16. The method of claim 10 wherein the effective amount of the diphenyliodonium salt is from about 1 to about 500 ppm based on the total amount of injection fluid injected into the formation or production system.

17. The method of claim 16 wherein the effective amount of the diphenyliodonium salt is from about 1 to about 100 ppm based on the total amount of injection fluid injected into the formation or production system.

18. The method of claim 16 wherein the effective amount of the diphenyliodonium salt is from about 1 to about 50 ppm based on the total amount of injection fluid injected into the formation or production system.

19. The method of claim 16 wherein the effective amount of the diphenyliodonium salt is from about 1 to about 10 ppm based on the total amount of water injected into the formation or production system.

20. The method of claim 10 wherein the hydrocarbon-containing system is a hydrocarbon extraction system, or a hydrocarbon production system.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a combination bar/line graph showing the reduction in levels of active microbes and hydrogen sulfide in fluids either left untreated or treated with diphenyliodonium chloride (DPIC) or diphenyliodonium nitrate (DPIN) at 1 ppm for 7 days, 27 days, and 70 days.

(2) FIG. 2 is a bar graph of the percent reduction in active microbes for diphenyliodonium chloride (DPIC) at 0.1 ppm, 1 ppm, 10 ppm, and 100 ppm at 11 days, 84 days, and at 305 days.

(3) FIG. 3 is a bar graph of the reduction of hydrogen sulfide concentrations for diphenyliodonium chloride (DPIC) at 0.1 ppm, 1 ppm, 10 ppm, and 100 ppm for 84 days and 305 days.

(4) FIG. 4 is a bar graph of the percent reduction in active microbes for diphenyliodonium chloride (DPIC) at 1 ppm and 10 ppm and diphenyliodonium nitrate (DPIN) at 0.1 ppm, 1 ppm, and 10 ppm at 1 day, 7 days, and 14 days.

(5) FIG. 5 is a bar graph of the efficacy of diphenyliodonium chloride (DPIC) at 10 ppm and 100 ppm and diphenyliodonium nitrate (DPIN) at 10 ppm and 100 ppm for 20%, 50%, and 80% concentrations of process water.

(6) FIG. 6 is a bar graph of the efficacy of three different biocides commonly used in oil and gas systems at 4 hours and 24 hours without or with diphenyliodonium nitrate (DPIN) at 10 ppm. Tetrakis(hydroxymethyl) phosphonium sulfate (THPS) was added at 400 ppm; glutaraldehyde was added at 250 ppm; hypochlorite was added at 100 ppm.

(7) Corresponding reference characters indicate corresponding parts throughout the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(8) The present invention is directed to methods for lowering sulfide concentrations and preventing growth of microbes in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system by administering diphenyliodonium salts. Oilfield produced fluids or seawater, where each contain high levels of microbes, can be treated with diphenyliodonium salts that can significantly decrease the amount of microbes and their activity in the fluids. The treatment can also significantly decrease the amount of hydrogen sulfide produced. Thus, these diphenyliodonium salts can be effectively used as sulfidogenesis inhibitors and biocides in oilfield fluids.

(9) One aspect of the invention is a method for reducing or preventing growth of a microbe in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system comprising administering an effective amount of a diphenyliodonium salt into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system using an injection fluid.

(10) Another aspect of the invention is a method for lowering sulfide concentration in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system comprising administering an effective amount of a diphenyliodonium salt into the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system using an injection fluid, wherein the diphenyliodonium salt inhibits the production of sulfide by a sulfur utilizing prokaryote.

(11) For the methods described herein, the hydrocarbon-containing system can comprise a hydrocarbon extraction system or a hydrocarbon production system.

(12) For the methods described herein, the water injection system, the hydrocarbon extraction system, or the hydrocarbon production system can be a subterranean hydrocarbon-containing formation, a well, a pipeline, a fluid separation vessel, a floating production storage vessel, an offloading vessel, a refinery, or a storage system.

(13) Further, the hydrocarbon extraction or the hydrocarbon production system can be a subterranean hydrocarbon-containing formation.

(14) In the methods described herein, the diphenyliodonium salt can further be administered with a biocide, administered with a calcium nitrate/perchlorate agent, administered with a preservative agent, combined with a method for removing sulfate, administered with a scale inhibitor, administered with an H.sub.2S scavenger, or a combination thereof.

(15) The diphenyliodonium salt can be administered with a biocide at the same time or from about one to about 24 hours after the biocide treatment. The biocide concentration depends on the identity of the biocide and the system conditions, and generally is administered at a concentration of from about 5 to about 200 ppm in a continuous treatment and from about 10 ppm to about 10,000 ppm, from about 25 ppm to about 5,000 ppm, from about 25 ppm to about 2,500 ppm, or from about 25 ppm to about 1,000 ppm in a batch treatment.

(16) The biocides can include tetrakis (hydroxymethyl) phosphonium sulfate (THPS), glutaraldehyde, hypochlorite, 2,2-dibromo-3-nitrilopropionamide, 2-bromo-2-nitropropane-1,3-diol, a quaternary amine, a peroxy acid, 2-propenal, 3,5-Dimethyl-1,3,5-thiadiazinane-2-thione, tributyltetradecylphosphonium chloride, cocodiamine, isothiazolinone, 4,4-dimethyloxazolidine, 1-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane, tris(hydroxymethyl)nitromethane, a perchlorate salt, a nitrate salt, a nitrite salt, or a combination thereof.

(17) The H.sub.2S scavenger can be monoethanolamine, diethanolamine, N-methyldiethanolamine, sodium chlorite, sodium nitrite, triazine, formaldehyde, hydrogen peroxide, 2-propenal, glyoxal, or a combination thereof.

(18) The injection fluid can comprise seawater, produced water, fresh water, brackish water, drilling fluid, completion fluid, or a combination thereof.

(19) The microbe can comprise a sulfur utilizing prokaryote. The sulfur utilizing prokaryote can produce hydrogen sulfide through the reduction of sulfate, thiosulfate, sulfite, bisulfite, sulfur, other inorganosulfur compounds, and organosulfur compounds, or a combination thereof.

(20) For the methods described herein, the diphenyliodonium salt can be injected into the water injection system, hydrocarbon extraction system, or production system continuously with the injection fluid.

(21) Further, the diphenyliodonium salt is injected into the water injection system, hydrocarbon extraction system, or production system intermittently with the injection fluid. When the diphenyliodonium salt is injected into the hydrocarbon extraction or production system intermittently, the injection of the diphenyliodonium salt is intermittently injected every one to three hours, every one to three days, or every one to three weeks.

(22) The sulfur utilizing prokaryote can comprise a genus or species of bacteria and archaea capable of reducing sulfur compounds to produce sulfide.

(23) Preferably, the sulfur utilizing prokaryote can comprise a sulfate-reducing bacteria. The sulfate-reducing bacteria can comprise Petrotoga sp., Desulfovibrio sp., Oceanotoga sp., Desulfocurvus sp., Desulfomicrobium sp., Desulfonauticus sp., Lawsonia sp., Kosmotoga sp., or a combination thereof.

(24) Another aspect of the invention is a composition for reducing or preventing growth of a sulfur utilizing prokaryote in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system, the composition comprising: an effective amount of a diphenyliodonium salt; and a solvent.

(25) Yet another aspect of the invention is a composition for lowering hydrogen sulfide concentration in a hydrocarbon-containing system comprising a water injection system, a hydrocarbon extraction system, or a hydrocarbon production system, the composition comprising: an effective amount of a diphenyliodonium salt; and a solvent.

(26) For the methods and compositions described herein, the diphenyliodonium salt can be diphenyliodonium chloride, diphenyliodonium nitrate, diphenyliodonium bromide, diphenyliodonium iodide, diphenyliodonium hexafluorophosphate, diphenyliodonium perchlorate, diphenyliodonium hexafluoroarsenate, or a combination thereof. Preferably, the diphenyliodonium salt can be diphenyliodonium chloride, diphenyliodonium nitrate, or a combination thereof. More preferably, the diphenyliodonium salt can comprise diphenyliodonium chloride or alternatively, the diphenyliodonium salt can comprises diphenyliodonium nitrate.

(27) The diphenyliodonium salts are commercially available, for example, from Sigma-Aldrich, St. Louis, Mo., and Alfa Aesar, Ward Hill, Mass.

(28) The effective amount of the diphenyliodonium salt is from about 1 to about 500 ppm, from about 1 to about 400 ppm, from about 1 to about 300 ppm, or from about 1 to about 200 ppm based on the total amount of injection fluid injected into the formation or production system, depending on the amount of bacteria and archaea that are present. Preferably, the effective amount of the diphenyliodonium salt is from about 1 to about 100 ppm based on the total amount of injection fluid injected into the formation or production system. More preferably, the effective amount of the diphenyliodonium salt is from about 1 to about 50 ppm based on the total amount of injection fluid injected into the formation or production system. Most preferably, the effective amount of the diphenyliodonium salt is from about 1 to about 10 ppm based on the total amount of water injected into the formation or production system.

(29) For the compositions of the invention, the solvent can comprise water, ethanol, methanol, isopropanol, heavy aromatic naphtha, ethylene glycol monobutyl ether (EGMBE), 2-ethanol hexanol, toluene, hexane, acetic acid, ascorbic acid, formic acid, oxalic acid, or a combination thereof.

(30) Having described the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.

EXAMPLES

(31) The following non-limiting examples are provided to further illustrate the present invention.

Example 1: Diphenyliodonium Efficacy Tests

(32) A hydrogen sulfide test kit (HACH, Model HS-C) and an AccuCount test kit (available from Nalco Champion) were used to test the efficacy of diphenyliodonium chloride (DPIC) and diphenyliodonium nitrate (DPIN) in 100 mL aliquots of injection water collected by mixing synthetic seawater, produced water from an oil and gas production facility off-shore California, USA, lactate, and thiosulfate. The results of the testing of these two compounds at 7, 27, and 70 days at a concentration of 1 ppm are shown in FIG. 1. The results of the testing of DPIC at 11 days, 84 days, and 305 days at concentrations of 0.1 ppm, 1 ppm, 10 ppm, and 100 ppm are shown in FIG. 2. The results of the testing of DPIC at 84 days and 305 days at concentrations of 0.1 ppm, 1 ppm, and 10 ppm are shown in FIG. 3. The results of the testing of DPIC and DPIN at 1 day, 7 days, and 14 days at concentrations of 0.1 ppm, 1 ppm, and 10 ppm in synthetic seawater are shown in the FIG. 4. The results of testing of DPIC and DPIN at 4 hours, 1 day, and 30 days at concentrations of 10 ppm and 100 ppm in 80% produced water, 50% produced water, and 20% produced water are shown in FIG. 5. The levels of hydrogen sulfide and the percentage reduction of active microbes show that both DPIC and DPIN are effective at reducing the concentration hydrogen sulfide and the level of active microbes in the samples.

(33) FIG. 6 shows the percent reduction in active microbes for DPIN with tetrakis(hydroxymethyl)phosphonium sulfate (THPS) (400 ppm), glutaraldehyde (250 ppm), and hypochlorite (100 ppm). The administration of the DPIN and the other biocides was concurrent in a batch treatment.

(34) Table 1 shows the relative abundance of each genus identified by Next-generation DNA sequencing from either the untreated or the 1 ppm DPIC treated samples after 305 days. The untreated sample after 305 days of incubation was predominated by sulfur reducing prokaryotes, with greater than 97% of the total population showing a sulfur reducing metabolism. In contrast, the same sample treated with DPIC at 305 days showed no detectable sulfur reducing prokaryotes by DNA sequencing, demonstrating that the DPIC treatment prevented growth of those organisms.

(35) TABLE-US-00001 TABLE 1 Relative Metabolic Genus Identified Abundance Class Untreated - 305 Days Petrotoga sp. 39.9% SRB Desulfovibrio sp. 33.1% NRB/SRB Oceanotoga sp. 8.5% SRB Desulfocurvus sp. 8.5% SRB Desulfomicrobium sp. 3.1% SRB Desulfonauticus sp. 1.5% SRB Lawsonia sp. 1.0% SRB Kosmotoga sp. 1.0% SRB Anaerophaga sp. 0.8% APB Bellilinea sp. 0.7% APB Desulfocella sp. 0.4% SRB Sulfurospirillum sp. 0.3% NRB/SRB Geoalkalibacter sp. 0.2% SRB/IRB Prolixibacter sp. 0.2% APB Sulfurimonas sp. 0.2% SOB Arcobacter sp. 0.2% NRB/SOB Dethiosulfovibrio sp. 0.2% SRB Desulfonatronospira 0.1% SRB sp. DPIC 1 ppm - 305 Days Thermovirga sp. 0.1% SRB Serratia sp. 59.3% NRB/GHB Raoultella sp. 28.8% APB Shimwellia sp. 6.7% APB Kluyvera sp. 3.5% APB/GHB/NRB Pseudomonas sp. 0.5% NRB/GHB Proteiniphilum sp. 0.3% APB Citrobacter sp. 0.3% APB Mangrovibacter sp. 0.2% NRB Sphaerochaeta sp. 0.2% APB Acholeplasma sp. 0.2% APB Cryptanaerobacter 0.1% APB sp.

(36) When introducing elements of the present invention or the preferred embodiments thereof, the articles a, an, the and said are intended to mean that there are one or more of the elements. The terms comprising, including and having are intended to be inclusive and mean that there may be additional elements other than the listed elements.

(37) In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

(38) As various changes could be made in the above compositions and methods without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.