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Compound bactericide used in oilfield flooding

A technology of oilfield water injection and fungicides, which is applied in the direction of fungicides, biocides, biocides, etc., can solve the problems of fungicide sterilization efficiency reduction, increase in dosage, and bacteria resistance, so as to achieve good sterilization effect and maintain reproduction , Bactericidal efficiency lasts for a long time

Inactive Publication Date: 2014-10-08
WEIHAI XIANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vitality of bacteria is extremely strong, and any kind of fungicides used for a long time will cause bacteria to develop drug resistance, causing problems such as a decrease in the bactericidal efficiency of the fungicide and an increase in the dosage of the fungicide. Therefore, it is necessary to continuously develop new oil field fungicides

Method used

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  • Compound bactericide used in oilfield flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select raw materials by weight percentage

[0014] Deionized water 60%

[0015] Sodium Cetyl Sulfate 8%

[0016] Tetrahydroxymethyl Phosphate 27%

[0017] Dithiocyanomethane 5%

Embodiment 2

[0019] Select raw materials by weight percentage

[0020] Deionized water 55%

[0021] Sodium Lauryl Sulfate 10%

[0022] Tetrahydroxymethylphosphine Chloride 30%

[0023] Dithiocyanomethane 5%

Embodiment 3

[0025] Select raw materials by weight percentage

[0026] Deionized water 55%

[0027] Sodium Cetyl Sulfate 8%

[0028] Tetrahydroxymethylphosphine Chloride 30%

[0029] Dithiocyanomethane 7%

[0030] Application Test and Results

[0031] 1. Comparison of the bactericidal effect of the medicament and a single quaternary phosphonium salt Table 1

[0032] Table 1 Comparison of the bactericidal effects of pesticides and single quaternary phosphorus salts

[0033]

[0034] 2. The bactericidal effect contrast table 1 of embodiment and single quaternary ammonium salt

[0035] Table 2 The bactericidal effect contrast of embodiment and single quaternary ammonium salt

[0036] As can be seen from the above table, the products of embodiment 1, embodiment 2 and embodiment 3 of the present invention have excellent bactericidal effect on sulfate-reducing bacteria, which are far greater than the non-oxidizing bactericides commonly used at present, and fully meet th...

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Abstract

The invention provides a compound bactericide used in oilfield flooding, relating to oilfield water treatment. The bactericide comprises the following components by weight percent: 50-60% of deionized water, 5-10% of surfactant, 25-30% of quaternary phosphonium salt and 5-10% of methylene dithiocyanate. The bactericide used in oilfield flooding can act under the conditions of high hardness, high alkalinity and high temperature, has good bactericidal effects on fungi and slime saprophytic bacteria, especially has terrific treatment effects on sulfate reducing bacteria, has long bactericidal efficiency duration, can effectively maintain reproduction of microorganisms in oil wells and can be widely used in the fields of oilfield flooding and sewage treatment in the oilfield industry.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a fungicide for oilfield water injection. Background technique [0002] In the secondary oil recovery of oilfields, a large amount of water injection is required. The water injection system contains various microorganisms such as sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria. During the process of growth, metabolism and reproduction, they can It will cause severe corrosion of metal materials such as drilling equipment and water injection pipelines, block pipelines, damage oil layers, cause water injection volume, oil production, and oil and gas quality to decline, and also bring serious difficulties to crude oil processing and cause great economic losses. Therefore, it is generally necessary to add fungicides for pretreatment before water injection. At present, the fungicides used in oil fields are generally used in civil water and industrial circul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N57/34A01P3/00A01P1/00C09K8/54A01N47/48
Inventor 杨京霖李洪社喻果
Owner WEIHAI XIANGYU TECH
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