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Medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria and preparation and application methods thereof

A preparation method and technology of sulfate, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as the increase in the number of dissimilated sulfate-reducing bacteria, the inability to use biological competition technology, and the sharp increase in treatment costs, etc., to achieve The effect of eliminating hydrogen sulfide pollution, shortening the treatment cycle, and preventing hydrogen sulfide rebound

Active Publication Date: 2015-10-14
E TECH ENERGY TECH DEV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the variability of sulfate-reducing bacteria, the application of this technology is not effective in some hydrogen sulfide-contaminated oilfields caused by biogenesis. The main reason is that the understanding of the metabolism of different types of sulfate-reducing bacteria is still shallow. Salt-reducing bacteria (referred to as dissimilatory sulfate-reducing bacteria), its growth characteristic is to metabolize sulfate in a sulfate environment, and when nitrate and sulfate exist at the same time, it preferentially metabolizes nitrate, and continues to metabolize sulfuric acid after nitrate is consumed Salt, so that when adding nitrate to the oil reservoir or production system or polluted environment to activate nitrate-reducing bacteria, catabolic-metabolizing sulfate-reducing bacteria will also multiply due to the metabolism of nitrate. The result is that: on the one hand, A large amount of nitrate is metabolized by dissimilatory sulfate-reducing bacteria, resulting in a great waste of medicines, and the dosage will continue to increase with the increase of the number of bacteria, and the cost of treatment will increase sharply; on the other hand, the number of dissimilatory sulfate-reducing bacteria will increase , which brings great hidden dangers to the treatment. Once the nitrate in the environment is metabolized, the multiplied dissimilative sulfate-reducing bacteria will immediately metabolize sulfate and produce more hydrogen sulfide than before treatment, causing a serious rebound of hydrogen sulfide pollution. Great hidden danger to production safety
Therefore, conventional biocompetition techniques cannot be used in such reservoirs or production processes or in contaminated environments

Method used

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  • Medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria and preparation and application methods thereof
  • Medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria and preparation and application methods thereof
  • Medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A medicament for inhibiting the dissimilative metabolism of sulfate-reducing bacteria, which is composed of 20% sodium nitrite, 5% potassium cyanide, 10% sodium phosphate, 3% octane phenol-10, and 1% L-ascorbic acid , Sodium sulfite 1%, water 60%.

Embodiment 2

[0041] A preparation method of a medicament for inhibiting the dissimilative metabolism of sulfate-reducing bacteria: 20% of sodium nitrite, 1% of potassium cyanide, 10% of sodium phosphate, 3% of octylphenol-10, 1% of L-ascorbic acid, and sodium sulfite 1% was added to reactor 7, water 1 was filtered through microfiltration membrane (pore size 0.1 μm) 4 and then filled with 64%, then stirred in reactor 7 for 1 hour, left to stand for 1 hour, and then coarsely filtered through a 30-mesh filter 6 for filtration, enters the microfiltration membrane 4 device for filtration, enters the medicine tank 3, and finally obtains the inhibitor A of dissimilating sulfate-reducing bacteria.

Embodiment 3

[0043] The dissimilation sulfate-reducing bacteria inhibitor prepared in embodiment 2 is tested on the growth influence experiment of different bacteria in oil field production water:

[0044] Add agent A at a concentration of 200mg / L to 500mL of oilfield production water, and regularly detect the number of obligate sulfate-reducing bacteria, dissimilating sulfate-reducing bacteria and nitrate-reducing bacteria after cultivation. After 14 days of treatment, the dissimilating sulfate-reducing bacteria The reduction rate of the number of nitrate-reducing bacteria was 99.9%. The activity of nitrate-reducing bacteria was better, and the number increased by 10 times. The number of obligate sulfate-reducing bacteria was also reduced. The specific experimental results are shown in Table 1.

[0045]Table 1 The results of the effect of agent A on the growth of different bacteria

[0046]

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Abstract

The invention relates to a medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria and preparation and application methods thereof. The invention belongs to the technical field of hydrogen sulfide treatment in oil and gas fields. The medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria comprises the following ingredients, by weight, 1-45% of nitrite, 0.01-40% of cyanide, 1-40% of phosphate, 0.5-30% of a dispersant, 0.1-10% of a stabilizing agent and 30-97% of water. The preparation method comprises the following steps: filtering water through a micro-filtration membrane, letting the filtered water enter a reaction vessel, adding a medicament into the reaction vessel, stirring to dissolve the medicament, standing, carrying out rough filtration on the liquid medicament through a rough filter, and carrying out secondary filtration through a micro-filtration membrane to obtain the medicament for inhibiting dissimilatory metabolic sulfate reducing bacteria. According to the application method, the inhibitory medicament at the concentration of 10-1000mg / L is injected into injection water or a production fluid or a polluted environment where dissimilatory metabolic sulfate reducing bacteria exit. The medicament has advantages of fast effectiveness, deep treatment degree, short treatment cycle, stable effect and simple preparation. The medicament is stable, has long shelf-life and has a wide range of application.

Description

technical field [0001] The invention belongs to the technical field of hydrogen sulfide treatment in oil and gas fields, and in particular relates to a medicament for inhibiting dissimilative metabolism of sulfate-reducing bacteria and a preparation and application method thereof. Background technique [0002] Hydrogen sulfide pollution is easy to be produced in oil fields during mining and production, and hydrogen sulfide pollution poses a major hidden danger to personnel safety, severely corrodes equipment and pipelines, reduces the quality of crude oil, and brings huge economic losses to oil fields. [0003] At present, the biogenic H2S treatment method is a biological competition inhibition technology. By adding nitrate, the main agent of the agent, to the polluted environment, the beneficial bacteria nitrate-reducing bacteria in the oil reservoir or production system environment are activated in a targeted manner, so that they can reproduce in large numbers and compete w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/532C09K2208/20
Inventor 高立红于亮谈涛
Owner E TECH ENERGY TECH DEV CORP
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