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Inhibitor for preventing sulfate reducing bacteria corrosion

A sulfate and inhibitor technology, applied in biocides, disinfectants, animal repellents, etc., can solve the problems of difficult penetration of fungicides, reduced sterilization efficiency, and high prices

Active Publication Date: 2009-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, adding fungicides is currently the most commonly used method, but because sulfate-reducing bacteria (SRB) often coexist with other microorganisms in the polysaccharide gum produced by microorganisms and are protected, fungicides are not easy to penetrate, and they are in the presence of hydrogen sulfide. In a reducing environment, it is difficult for general oxidizing fungicides to have an effective bactericidal effect; the existence of biofilm reduces the bactericidal efficiency or even fails, so that drug-resistant bacteria
Moreover, the extensive use of fungicides also brings new loads to environmental governance.
At the same time, the price is high, which affects the normal operation of the production system

Method used

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  • Inhibitor for preventing sulfate reducing bacteria corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Inhibitor to prevent corrosion of sulfate reducing bacteria, the weight ratio of each component is:

[0039] a. Polypeptide condensation reagent (HOOBt) C with a content of 0.05% 7 H 5 N 3 O 2 Aqueous solution: 18.0%

[0040] b. Magnesium sulfate MgSO 4 ·7H 2 O: 5.0%

[0041] c. Sodium sulfate: 3.5%

[0042] d. Yeast extract: 0.15%

[0043] e, dipotassium hydrogen phosphate K 2 HPO 4 : 2.0%

[0044] f. Vitamin C: 0.055%

[0045] g. The rest is water, and the total weight percentage of each component is 100%.

[0046] The weight percentages of the components in Examples 2 to 5 are listed as follows:

[0047] Component name

[0048] In the inhibitors for preventing corrosion of sulfate-reducing bacteria in Examples 2 to 5, the sum of the weight percentages of each component is 100%, and the preparation process is the same as in Example 1.

[0049] The present invention has been used in more than 30 oil wells with severe SRB corrosion in Huabei Oilfield si...

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Abstract

Disclosed is an inhibitor applied in oil well for preventing against corrosion from sulfate reducing bacteria, which is characterized by comprising the following components: a. 0.05% by weight of aqueous solution of peptide coupling reagent (HOOBt) C7H5N3O2; b. 2.0-5.0% by weight of magnesium sulphate(MgSO4*7H2O); c. 1.5-4.5% by weight of sodium sulphate; d. 0.05-0.2% by weight of yeast extract; e. 0.5-2.0% by weight of dipotassium hydrogen phosphate(K2HPO4); f. 0.05-0.5% by weight of vitamin C; g. and the balance of water. During the process of preventing against corrosion from sulfate reducing bacteria in oil well, the inhibitor preventing against corrosion from sulfate reducing bacteria produced by the method can keep the content of sulfate reducing bacteria below 25 / ml in the case of 0.05-0.1% addition of the inventive inhibitor.

Description

Technical field [0001] The invention belongs to the technical field of chemicals for the petroleum industry, and particularly relates to an inhibitor formula for preventing corrosion of sulfate reducing bacteria (SRB) and a preparation method thereof. In the process of preventing sulfate-reducing bacteria in oil wells, the content of sulfate-reducing bacteria in the system is less than 25 / ml under the condition of 0.05-0.1% increase. Background technique [0002] Sulfate-reducing bacteria (SRB) is an anaerobic bacteria that uses organic matter as nutrients. It is widely found in soil, sea water, river water, underground pipelines, oil and gas wells, etc. Sulfate-reducing bacteria (SRB) can reduce the sulfate in water to hydrogen sulfide, so that the pH value of the local area drops below 4, which is serious for low-carbon steel, low-alloy steel, nickel alloy, austenitic stainless steel, and copper alloy steel. Pitting and the formation of black iron sulfide precipitates. In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N63/04A01P1/00C02F3/34C09K8/54
Inventor 付亚荣周晓俊田炜蔡远红李冬青吴泽美吕德福刘宏伟郝玉军申玉健付丽霞常洪郑征杨军
Owner PETROCHINA CO LTD
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