Multifunctional preparation for controlling biological corrosion and blockage of oilfield production system

A production system and biological corrosion technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of oil field equipment corrosion, formation and downhole equipment corrosion, blockage, etc., to eliminate iron sulfide blockage and reduce anti-corrosion costs. , reduce the effect of the production system

Active Publication Date: 2010-11-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the bactericide used is difficult to penetrate the biofilm and scale, it can only kill the free SRB in the water, so the efficiency of killing SRB is low, so the oil field equipment is still corroded
The chemicals currently used to kill SRB directly are highly toxic. Long-term use not only pollutes the environment, but also easily produces drug resistance. Only by increasing the dosage and replacing with new fungicides
The current technical methods do not remove the formed hydrogen sulfide and ferrous sulfide in time, which will still cause corrosion and blockage to the formation and downhole equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At the initial stage of the test, the weight content of each functional preparation in the treated water was as follows:

[0026] 1) Fungicide: glutaraldehyde or dodecyl dimethyl benzyl ammonium chloride 20-200ppm;

[0027] 2) Inhibitors: sodium nitrate: 10-100ppm; and sodium molybdate or sodium tungstate 10-20ppm;

[0028] 3) Corrosion inhibitor: imidazoline quaternary ammonium salt 10-20ppm

[0029] 4) Sulfur removal agent: trimethylol nitromethane 20-50ppm

[0030] 5) Penetrant: Alkylphenol polyoxyethylene ether 10-20ppm

[0031] The combination of the above-mentioned preparations with various functions works together when the oil field starts to be used, which can improve the effect of fungicides and inhibitors on killing SRB, and eliminate the existing sulfide plugging.

Embodiment 2

[0033] Different from Example 1, acrolein has the functions of sterilization and sulfide removal, so the multifunctional preparation can also adopt the following composition.

[0034] The weight content of each functional preparation in the treated water is as follows:

[0035] (1) Fungicide: 20-200ppm of acrolein or dodecyl dimethyl benzyl ammonium bromide;

[0036] (2) Inhibitors: sodium nitrite: 10-100ppm; and sodium molybdate or lithium molybdate 10-20ppm;

[0037] (3) Corrosion inhibitor: imidazoline quaternary ammonium salt 10-20ppm

[0038] (4) Penetrant: Alkylphenol polyoxyethylene ether 10-20ppm

Embodiment 3

[0040] After the test is carried out for a period of time (such as 3 months), the content of each functional preparation can be adjusted in time to meet the production requirements and save costs. The concentration of fungicides can be reduced by 50%, and the concentration of inhibitors can be doubled at low cost. Corrosion inhibitor concentration can be reduced by 50%.

[0041] The weight content of each functional preparation in the treated water is as follows:

[0042] (1) Fungicide: glutaraldehyde or dodecyl dimethyl benzyl ammonium chloride 20-100ppm;

[0043] (2) Inhibitors: sodium nitrite: 50-100ppm; and sodium molybdate or lithium molybdate 10-20ppm;

[0044] (3) Corrosion inhibitor: imidazoline quaternary ammonium salt 10ppm

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PUM

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Abstract

The invention relates to a multifunctional preparation for controlling biological corrosion and blockage of an oilfield production system. The contents of functional preparations in the treating water are as follows: 20 to 200 ppm of disinfectant: glutaraldehyde, acrolein, dodecyldimethylbenzyl ammonium chloride or dodecyldimethylbenzyl ammonium bromide, 10 to 100 ppm of inhibitor: sodium nitrateor sodium nitrite; and / or 10 to 20 ppm of sodium molybdate, sodium tungstate or lithium molybdate; 10 to 20 ppm of corrosion inhibitor: imidazoline quaternary ammonium; or / and 20 to 50 ppm of desulphurizing reagent: trihydroxymethyl nitromethane; or / and 10 to 20 ppm of penetrating agent: alkylpheol ethoxylates. The components undergo synergistic action so that the concentration of the single component is reduced obviously and reaches 25 to 90%, and the efficiency of killing the SRB (Sulfate Reducing Bacteria) reaches more than 90%.

Description

technical field [0001] The invention relates to a multifunctional preparation for controlling biocorrosion and clogging of an oil field production system. Background technique [0002] Microorganisms in oilfield injection water are generally divided into anaerobic microorganisms and aerobic microorganisms. Anaerobic microorganisms are mainly sulfate-reducing bacteria, anaerobic fermentation bacteria, methanogenic bacteria and denitrifying bacteria. Aerobic microorganisms are mainly hydrocarbon oxidizing bacteria, iron bacteria and Saprophytes. Sulfate-reducing bacteria, iron bacteria and saprophytic bacteria are the main causes of microbial corrosion and plugging of oilfield water injection systems and water injection formations. As long as there is a small amount of aerobic saprophytic bacteria, they can reproduce. Where saprophytic bacteria exist, there is bacterial slime, which sticks with crude oil, corrosion products, and scale in the sludge to form bacterial slime, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
Inventor 关密生朱志宏向廷生韩红雁杜文军冯业庆
Owner PETROCHINA CO LTD
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