Pcr amplification methods for detecting and quantifying sulfate-reducing bacteria in oilfield fluids

Patent metadata

Field	Value
Publication number	US-2018291428-A1
Application number	US-201815899227-A
Country	US
Kind code	A1
Filing date	Feb 19, 2018
Priority date	Mar 12, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

At least one nucleic acid from a sulfate-reducing bacteria (SRB) may be extracted from an oilfield fluid and may be amplified by a PCR amplification method in the presence of at least one primer to form an amplification product. The primer(s) may be or include a sequence including, but not necessarily limited to, SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, and mixtures thereof. The amplification product may be hybridized with a probe specific for a fragment of an alpha subunit of an APS gene, and a presence of hybridization and a degree of hybridization may be detected.

First claim

What is claimed is:

1 . A method of decreasing sulfate-reducing bacteria (SRB) in oilfield fluids comprising:
altering an amount of a microbial agent within an oilfield fluid to form an altered oilfield fluid based on an amount of at least one SRB within an oilfield fluid; wherein the amount of the at least one SRB is determined by:
amplifying at least one nucleic acid of the at least one SRB in the presence of at least one primer to form an amplification product; wherein the at least one nucleic acid is extracted from the oilfield fluid prior to amplifying the at least one nucleic acid; wherein the at least one primer comprises a sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, and mixtures thereof;
hybridizing the amplification product with a probe specific for a fragment of an alpha subunit of an Adenylylsulfate Reductase gene; and
detecting a presence of hybridization and a degree of hybridization, wherein the presence of hybridization indicates the presence of the at least one SRB, and wherein the degree of hybridization enumerates the at least one SRB; and
decreasing the amount of SRB by killing and/or deactivating the SRB wherein the altered oilfield fluid comprises a decreased amount of SRB as compared to the oilfield fluid.

2 . The method of claim 1 , wherein the oilfield fluid is selected from the group consisting of produced waters, oilfield waters, production fluids, fracturing fluids, drilling fluids, completion fluids, workover fluids, packer fluids, gas fluids, crude oils, refinery fluids, processed crude oils, refined products, process and waste waters, midstream fluids, downstream fluids, and mixtures thereof.

3 . The method of claim 1 , wherein the probe is detectably labeled.

4 . The method of claim 1 , wherein the at least one sulfur-species bacteria is selected from the group consisting of Desulfovibrio vulgaris, Desulfovibrio desulfuricans, Desulfovibrio aespoeensis, Thermodesulfobium narugense, Desulfotomaculum carboxydivorans, Desulfotomaculum ruminis, Desulfovibrio africanus, Desulfovibrio hydrothermalis, Desulfovibrio piezophilus, Desulfobacterium corrodens , Sulfate-reducing bacterium QLNR1 , Desulfobacterium catecholicum, Desulfobacterium catecholicum, Desulfobulbus marinus, Desulfobulbus, Desulfobulbus propionicus, Desulfocapsa thiozymogenes, Desulfocapsa sulfexigens, Desulforhopalus vacuolatus, Desulforhopalus, Desulfofustis glycolicus strain, Desulforhopalus singaporensis, Desulfobacterium, Desulfobacterium zeppelinii strain, Desulfobacterium autotrophicum, Desulfobacula phenolica, Desulfobacula toluolica Tol2, Sulfate-reducing bacterium JHA1 , Desulfospira joergensenii, Desulfobacter, Desulfobacter postgatei, Desulfotignum, Desulfotignum balticum, Desulforegula conservatrix, Desulfocella, Desulfobotulus sapovorans, Desulfofrigus, Desulfonema magnum, Desulfonema limicola, Desulfobacterium indolicum, Desulfosarcina variabilis, Desulfatibacillum, Desulfococcus multivorans, Desulfococcus, Desulfonema ishimotonii, Desulfococcus oleovorans Hxd3 , Desulfococcus niacini, Desulfotomaculum, Desulfotomaculum nigrificans, Desulfotomaculum ruminis, Desulfotomaculum halophilum, Desulfotomaculum acetoxidans, Desulfotomaculum gibsoniae, Desulfotomaculum sapomandens strain, Desulfotomaculum thermosapovorans, Desulfotomaculum, Desulfotomaculum geothermicum, Desulfotomaculum, Desulfosporosinus meridiei, Delta proteobacterium, Thermodesulforhabdus norvegica, Desulfacinum infernum, Desulfacinum hydrothermale, Desulforhabdus amnigena, Desulforhabdus, Desulforhabdus, Desulfomonile tiedjei, Desulfarculus baarsii , Sulfate-reducing bacterium, Sulfate-reducing bacterium, Sulfate-reducing bacterium, Desulfobacterium anilini, Delta proteobacterium, Desulfovibrio profundus strain, Desulfomicrobium baculatum, Desulfocaldus hobo, Desulfovibrio, Desulfovibrio piger, Desulfovibrio ferrophilus, Desulfonatronovibrio hydrogenovorans, Desulfovibrio, Desulfovibrio acrylicus, Desulfovibrio salexigens, Desulfovibrio oxyclinae, Desulfonauticus submarinus, Desulfothermus naphthae, Thermodesulfobacterium, Thermodesulfobacterium hveragerdense, Thermodesulfobacterium thermophilum, Thermodesulfatator indicus, Thermodesulfovibrio yellowstonii, Desulfosporosinus orientis, Desulfotomaculum thermobenzoicum, Desulfotomaculum, Desulfotomaculum, Desulfotomaculum solfataricum, Desulfotomaculum luciae strain, Desulfobacca acetoxidans, Desulfovibrio vulgaris, Desulfovibrio desulfuricans, Desulfovibrio alaskensis, Desulfovibrio magneticus, Desulfosporosinus acidiphilus, Desulfotomaculum kuznetsovii, Desulfotomaculum kuznetsovii, Desulfovibrio sulfodismutans, Desulfomicrobium baculatum, Desulfonatronum lacustre, Desulfohalobium retbaense, Desulfonauticus autotrophicus, Thermodesulfobacterium commune, Thermodesulfobacterium hveragerdense, Thermodesulfovibrio islandicus, Thermodesulfovibrio, Thermodesulfobacterium, Desulfotomaculum thermobenzoicum, Desulfotomaculum thermoacetoxidans, Desulfotomaculum thermocisternum, Desulfotomaculum australicum, Desulfotomaculum kuznetsovii, Desulfovibrio desulfuricans, Desulfovibrio alaskensis, Desulfovibrio vulgaris, Desulfovibrio salexigens, Desulfosporosinus acidiphilus, Desulfosporosinus meridiei, Desulfosporosinus orientis, Desulfotomaculum reducens , and combinations thereof.

5 . The method of claim 1 , wherein the at least one primer is specific for amplification of at least a fragment of an alpha subunit of an Adenylylsulfate Reductase gene.

6 . The method of claim 1 , further comprising circulating the altered oilfield fluid within a subterranean reservoir wellbore, wherein the altered oilfield fluid is selected from the group consisting of altered fracturing fluids, altered drilling fluids, altered completion fluids, altered workover fluids, altered packer fluids, altered produced waters, altered oilfield waters, altered production fluids, altered gas fluids, altered crude oils, altered refinery fluids, altered processed crude oils, altered refined products, altered process and waste waters, altered midstream fluids, altered downstream fluids, and combinations thereof.

7 . A method of decreasing sulfate-reducing bacteria (SRB) in oilfield fluids comprising:
altering an amount of a microbial agent within an oilfield fluid based on an amount of at least one SRB within the oilfield fluid to form an altered oilfield fluid; wherein the oilfield fluid is selected from the group consisting of oilfield water, a production fluid, a fracturing fluid, a drilling fluid, a completion fluid, a workover fluid, a packer fluid, a gas fluid, a crude oil, and mixtures thereof; wherein the amount of the at least one SRB is determined by:
amplifying at least one nucleic acid of the at least one SRB in the presence of at least one primer to form an amplification product; wherein the at least one nucleic acid is extracted from the oilfield fluid prior to amplifying the at least one nucleic acid; wherein the at least one primer comprises a sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, and mixtures thereof;
hybridizing the amplification product with a probe having a nucleotide sequence selected from the group consisting of SEQ ID NO: 16, SEQ ID NO: 17, SEQ ID NO: 18, SEQ ID NO: 19, and mixtures thereof; and
detecting a presence of hybridization and a degree of hybridization; wherein the presence of hybridization indicates the presence of the at least one SRB; and wherein the degree of hybridization enumerates the at least one SRB; and
decreasing the amount of SRB by killing and/or deactivating the SRB.

8 . The method of

Assignees

• Baker Hughes A Ge Co Llc

Inventors

• Lee Crystal

Classifications

• C12Q1/689

  for bacteria · CPC title

• C12Q1/686 Primary

  Polymerase chain reaction [PCR] · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C10G31/00

  Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for (by distillation C10G7/00) · CPC title

• C09K8/58

  Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids · CPC title