Method for inhibiting activity of sulfate reducing bacteria in oil field surface water and agent used thereof

A surface water and sulfate technology, applied in botany equipment and methods, chemicals for biological control, applications, etc., can solve problems such as polluted environment, sulfur ion corrosion of oil field equipment, and high toxicity of chemicals

Active Publication Date: 2007-08-08
DAQING OILFIELD CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing physical and chemical methods for directly killing SRB all have low killing rates of sulfate-reducing bacteria, oilfield equipment still suffers from sulfur ion corrosion and the chemical agents currently used to directly poison SRB are highly toxic and long-term A method for inhibiting the activity of sulfate-reducing bacteria in oil field surface water and the medicament used are provided by using the defects of not only polluting the environment but also easily producing drug-resistant strains

Method used

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  • Method for inhibiting activity of sulfate reducing bacteria in oil field surface water and agent used thereof

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specific Embodiment approach 1

[0006] Specific embodiment one: present embodiment suppresses the used inhibitory agent of sulfate-reducing bacteria activity in surface water of oil field by mass and number ratio by the sodium nitrate of 100 parts, the sodium nitrite of 2~20 parts, the cobalt nitrate of 0.2~0.6 parts , 0.2-0.6 parts of nickel nitrate, 0.2-0.6 parts of copper nitrate and 0.2-0.6 parts of sodium molybdate.

[0007] In this embodiment, the sodium nitrate can effectively inhibit the activity of sulfate-reducing bacteria, and improve the biological activity of denitrifying microorganisms in the oil field surface water. In this embodiment, sodium nitrite can increase the oxidation-reduction potential and accelerate the initial rate of denitrification inhibitory agent by 20% to 30%. In this embodiment, cobalt nitrate, nickel nitrate, copper nitrate and sodium molybdate can promote the growth of denitrifying microorganisms and synergistically increase the effect of inhibiting sulfate-reducing bacter...

specific Embodiment approach 2

[0011] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the inhibitory agent used to inhibit the activity of sulfate-reducing bacteria in oil field surface water is composed of 100 parts of sodium nitrate, 5 to 15 parts of sub It is composed of sodium nitrate, 0.3-0.5 parts of cobalt nitrate, 0.3-0.5 parts of nickel nitrate, 0.3-0.5 parts of copper nitrate and 0.3-0.5 parts of sodium molybdate.

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment one is: suppress the used inhibitory agent of sulfate-reducing bacteria activity in oil field surface water by the sodium nitrate of 100 parts, the sodium nitrite of 10 parts by mass and number ratio , 0.4 parts of cobalt nitrate, 0.4 parts of nickel nitrate, 0.4 parts of copper nitrate and 0.2 parts of sodium molybdate.

[0013] This embodiment is determined by comprehensive consideration of the inhibitory effect and the cost of dosing.

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Abstract

The invention relates to a method for restraining the activity of reduction bacterial in the ground water of oil field, and relative drugs. The invention can resolve the problems of present method as low SRB disinfect ratio, high chemical toxicity, serious pollution or the like. The invention comprises 100 deals of sodium nitrate, 2-20 deals of erinitrit, 0.2-0.6 deals of cobalt nitrate, 0.2-0.6 deals of nickel nitrate, 0.2-0.6 deals of cupric nitrate, and 0.2-0.6 deals of sodium molybdate. And the restraining method comprises that 1, preparing the mother solution of restraining agent; 2, measuring the content of SO42-; 3, adding the mother solution of restraining agent. The inventive restraining agent can improve the activity of anti-nitrated microbe, without toxicity, pollution and the drug-fast generation. The invention uses the environment and nourishment competitions to restrain the activity of SRB in the ground water of oil field, to reduce more than 85% of S2 density.

Description

technical field [0001] The invention relates to a method for inhibiting the activity of sulfate-reducing bacteria in water and the used medicament. Background technique [0002] my country's onshore oilfields have entered the secondary oil recovery period of oil layer water injection and the tertiary oil recovery period of oil layer injection polymer. After separation, the oil is exported as a product, and the separated water is called oilfield surface water. After treatment, the oilfield surface water is injected back into the underground oil layer for recycling. [0003] There are many kinds of bacteria in oilfield surface water, among which the most harmful to the oilfield surface oil recovery system is Sulfate Reducing Bacteria (SRB), SRB can reduce sulfate radical to sulfur ion, and sulfur ion can cause equipment corrosion. Due to the insoluble nature of metal sulfides, the content of suspended solids in the produced water increases, resulting in filter material polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01P15/00C02F1/50
Inventor 刘广民陈忠喜任南琪舒志明夏福军魏利张照韩
Owner DAQING OILFIELD CO LTD
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