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Microbial agent applied to wax and corrosion prevention of oil well as well as preparation method thereof

A microbial agent and microbial technology, which is applied in the field of oil field chemical agents in the petroleum industry, can solve the problems of no anti-corrosion effect, anti-corrosion effect and no anti-wax effect, etc., achieving good effect, avoiding large dosage, and convenient use

Inactive Publication Date: 2018-09-21
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Conventional microbial wax inhibitors are a mixture of petroleum hydrocarbon-degrading bacteria dominated by a variety of facultative anaerobic bacteria, and contain no or very little denitrifying bacteria (DNB). It has anti-corrosion effect; while the conventional denitrifying bacteria (DNB) bacteria agent only has anti-corrosion effect and does not have anti-wax effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The second aspect of the present invention provides the preparation method of the above-mentioned microbial bacterial agent for oil well anti-wax and anticorrosion, the steps include: weighing industrial salt, inorganic ammonium salt, nitrate, inorganic phosphorus salt, inorganic sulfate, white oil and Add water into the vacuum fermenter, stir evenly, heat to 115-125°C to sterilize for 25-30 minutes, cool down to 92-96°C, add microbial anti-wax strains and denitrifying strains into the vacuum fermenter in proportion, Then lower the temperature to 55-65°C, stop heating after 48h-72h of fermentation; cool down to 15-35°C while stirring, and obtain the microbial bacterial agent.

[0019] The microbial bacterial agent prepared by the above-mentioned method can be directly added to oil wells, and can have both good wax-proof and anti-corrosion effects, and the use method is simple.

Embodiment 1

[0024] This embodiment provides a microbial agent for oil well anti-wax and anticorrosion, the microbial agent components are: by weight percentage, sodium chloride: 15%; industrial ammonium chloride: 3%; industrial sodium nitrate Industrial sodium phosphate: 1.5%; Industrial magnesium sulfate: 0.5%; White oil: 12%; 6% of microbial anti-wax bacteria; The species are: in weight percentage, Pseudomonas 80%, Corynebacterium 10%, Chlorococcus 10%; the denitrifying bacteria species are: in weight percentage, Pseudomonas denitrification 70%, paranitrite denitrification Cocci 30%.

[0025] The preparation method of the above-mentioned microbial bacterial agent used for oil well anti-wax and anticorrosion, the steps include: weighing sodium chloride, industrial ammonium chloride, industrial sodium nitrate, industrial sodium phosphate, industrial magnesium sulfate, white oil and water according to the above ratio In the cleaned fermentation tank with stirring, temperature control and ...

Embodiment 2

[0027] In this example, the microbial bacterial agent was prepared according to the ratio of Example 1, and the microbial bacterial agent was used in an oil production plant to conduct a wax-proof and anti-corrosion test.

[0028] Microbial agent preparation: 1. Weigh 150 kg of industrial salt (industrial sodium chloride), 30 kg of inorganic ammonium salt (industrial ammonium chloride), 50 kg of nitrate (industrial sodium nitrate), and inorganic phosphorus salt (industrial sodium phosphate). ) 15 kg, 5 kg of inorganic sulfate (industrial magnesium sulfate), 120 kg of white oil, and 490 kg of water are added to the cleaned 1000L fermenter with stirring, temperature control and vacuum systems, stirred evenly, and heated to 121 ℃ sterilization for 30 minutes, cooled to 95 ℃, adding 60 kg of microbe-cleaning wax-proof bacteria (pseudomonas 80%, coryneform bacteria 10%, small coccus 10%), denitrifying bacteria (pseudomonas denitrification 70%, denitrification paracoccus 30%) 80 kil...

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Abstract

The invention relates to a microbial agent applied to wax and corrosion prevention of an oil well. The microbial agent comprises 10.0 to 18.0 percent of industrial salt, 2.0 to 4.0 percent of inorganic ammonium salt, 4.0 to 6.0 percent of nitrate, 1.0 to 2.0 percent of inorganic phosphorus salt, 0.5 to 1.0 percent of inorganic sulfate, 8.0 to 12.0 percent of white oil, 5.0 to 10.0 percent of microbial wax-preventing culture, 5.0 to 10.0 percent of denitrifying culture and 37.0 to 64.5 percent of water, wherein the microbial wax-preventing culture comprises pseudomonas, corynebacterium and micrococcus; and the denitrifying culture comprises pseuomonas denitrifican and paracoccus denitrificans. The invention further provides a preparation method of the microbial agent. The microbial agent can control corrosion of the oil well (hydrogen sulfide corrosion generated by sulfate reducing bacteria) while controlling wax precipitation of the oil well, and can avoid various problems caused by the use of the traditional chemical wax cleaning and preventing agent and chemical sterilizer; and the microbial agent is multi-purpose, high in reliability, high in economic benefit, convenient to useand good in effect.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical agents in the petroleum industry, in particular to a microbial agent for oil well wax prevention and anticorrosion and a preparation method thereof. Background technique [0002] In the process of oil production, as the temperature and pressure of the wellbore drop, the waxy components in the crude oil will often precipitate, grow and deposit in the tubing, thereby forming oil well wax deposits, seriously affecting the normal production of the oil well. Therefore, effective measures must be taken to control oil well wax deposition. At the same time, hydrogen sulfide (H 2 S), while hydrogen sulfide (H 2 S) It has a strong corrosive effect on oil well metal pipes and equipment. Therefore, effective measures must be taken to control microbial corrosion in oil wells. [0003] At present, the methods for controlling wax deposition in oil wells mainly include physical methods, chemical met...

Claims

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Application Information

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IPC IPC(8): C12N1/20C09K8/54C09K8/524C12R1/38C12R1/15C12R1/01
CPCC09K8/524C09K8/54C09K2208/32C12N1/20
Inventor 易绍金
Owner YANGTZE UNIVERSITY
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