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Bactericidal agent for water injection well and preparation method and application of bactericidal agent

A technology of fungicides and water injection wells, applied in the direction of botany equipment and methods, applications, biocides, etc., can solve the problems of easy decomposition of hydrogen peroxide, high toxicity of chlorine dioxide, and short action time, so as to achieve difficult decomposition and sterilization Long action time, reducing the corrosion effect of steel pipelines and equipment

Inactive Publication Date: 2018-03-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The chlorine dioxide in the fungicides for oilfield water injection wells provided by the prior art is highly toxic and easily causes secondary pollution, and hydrogen peroxide is easy to decompose and has a short action time

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0026] In a second aspect, the embodiments of the present invention also provide a method for preparing the above-mentioned fungicide for water injection wells, the method comprising:

[0027] According to the mass percentage, water is added into the reactor, and then the quaternary ammonium salt fungicide, the aldehyde fungicide and the guanidine fungicide are added into the water, and stirred to obtain the water injection well fungicide. The preparation process is simple and convenient for practical application.

[0028] Specifically, the reactor is a liquid distribution tank or an acid storage tank. The preparation of the fungicide for the water injection well by using the liquid mixing tank or the acid storage tank facilitates timely and convenient preparation and use of the fungicide for the water injection well provided by the invention during actual on-site operation. For example, when there is a liquid distribution tank near the oil well area, the water injection well...

Embodiment 1

[0035] This embodiment provides a fungicide for water injection wells, comprising the following components in mass percentage: 21% of dodecyldimethylbenzyl ammonium chloride, 7% of glutaraldehyde, 1.4% of guanidine sulfate, and isothiazolinone 1%, and the balance is water.

[0036] The preparation method of this water injection well fungicide is as follows:

[0037] According to the above mass percentage, water is added to the liquid mixing tank, then dodecyldimethylbenzyl ammonium chloride, glutaraldehyde, guanidine sulfate, and isothiazolinone are added to the water, and stirred for 30 minutes to obtain the mixture provided in this example. fungicide for injection wells.

[0038] Test the effect of the fungicide for water injection wells provided in this example: use a high-pressure pump to add the fungicide for reinjection water provided in this example with a mass percentage of 1% of the mass of the reinjected water in a well with a height of 103-6X. After 24 hours, the ...

Embodiment 2

[0040] This embodiment provides a fungicide for water injection wells, comprising the following components in mass percentage: 19.6% of dodecyldimethylbenzyl ammonium chloride, 8.4% of glutaraldehyde, 2% of polyhexamethyleneguanidine, 0.8% isothiazolinone, the balance is water.

[0041] The preparation method of this water injection well fungicide is as follows:

[0042] According to the above mass percentage, add water into the liquid mixing tank, then add dodecyldimethylbenzyl ammonium chloride, glutaraldehyde, polyhexamethyleneguanidine, and isothiazolinone into the water, stir for 35min, and obtain The water injection well fungicide provided in this embodiment.

[0043] Test the effect of the injection well bactericide provided in this example: use a high-pressure pump to add the reinjection water bactericide provided in this example with a mass percentage of 1.5% of the reinjection water quality in the Xiliu 10-126X well. After 24 hours, the test shows that the amount o...

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Abstract

The invention discloses a bactericidal agent for a water injection well and a preparation method and application of the bactericidal agent, and belongs to the field of oilfield reinjection water. Thebactericidal agent for the water injection well is prepared from, by mass, 14.6-26.3% of quaternary ammonium salt bactericide, 4.9-13.2% of aldehyde bactericide, 0.9-3.4% of guanidine bactericide, 0.5-3% of isothiazolinone and the balance water. The quaternary ammonium salt bactericide refers to dodecyl dimethyl benzyl ammonium chloride and / or dodecyl benzyl trimethyl ammonium chloride; the aldehyde bactericide refers to glutaraldehyde; the guanidine bactericide refers to guanidine sulfate and / or polyhexamethylene guanidine. The provided bactericidal agent for the water injection well is smallin toxicity, not easy to volatilize and difficult to decompose and has the advantages of being good in chemical stability, long in sterilization time, free of secondary pollution and the like.

Description

technical field [0001] The invention relates to the field of oilfield reinjection water, in particular to a fungicide for water injection wells and a preparation method and application thereof. Background technique [0002] In the process of oilfield exploitation, the reservoir pressure will gradually decrease with the prolongation of the exploitation time, the oil-gas ratio will gradually increase, and the viscosity of underground crude oil will increase accordingly, which will easily cause the oil well to stop blowing. Therefore, it is necessary to inject an appropriate amount of reinjection water in the oil layer in time to maintain a certain pressure in the oil layer. However, the reinjection water contains harmful fungi such as sulfate-reducing bacteria, iron bacteria, and saprophytic bacteria. Sulfate-reducing bacteria, iron bacteria, and saprophytic bacteria can cause serious corrosion to steel pipelines and equipment through the generation of oxygen concentration ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N47/44A01N43/80A01N35/02A01N33/12A01P1/00C02F1/50
CPCA01N33/12A01N35/02A01N43/80A01N47/44C02F1/50C02F2103/10A01N2300/00
Inventor 车航刘国华李凝李玉涛吴刚飞罗炯崔伟
Owner PETROCHINA CO LTD
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