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Bactericide for oilfield water injection treatment and preparation method thereof

An oil field water injection and fungicide technology, which is applied in mining wastewater treatment, botanical equipment and methods, and chemicals for biological control, etc. Less dosage, good bactericidal effect, low toxicity effect

Pending Publication Date: 2022-06-03
河南省科学院同位素研究所有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to, aiming at the deficiencies of the prior art, provide a fungicide for oil field water injection treatment and its preparation method, which solves the shortcomings of the existing oil field fungicides such as large amount of fungicide, difficult to degrade, and poor bactericidal effect, and has low cost , less dosage, efficient sterilization, environmental friendliness, wide range of use, etc., can meet the production needs of oilfields and effectively protect oilfield system pipelines and equipment

Method used

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  • Bactericide for oilfield water injection treatment and preparation method thereof

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Effect test

Embodiment 1

[0024] A preparation method for oil field water injection treatment bactericide, comprising the following steps:

[0025] S1. Preparation of low-molecular-weight chitosan: The completely dried chitosan powder sample was placed in an irradiation tube, and nitrogen was introduced for 5 minutes to remove oxygen, and then sealed + sealed at room temperature. 60 Degradation by γ-ray irradiation was carried out in the Co radioactive source room, the irradiation dose was 150kGy, and the irradiation time was 50h to obtain low-molecular-weight chitosan with a viscosity-average molecular weight of 50kDa;

[0026] S2, the preparation of quaternary ammonium salt etherifying agent: in a four-necked flask equipped with a thermometer, mechanical stirring and reflux condensation, add 0.1 mol of N,N-dimethyldodecyl tertiary amine, turn on heating and mechanical stirring , 0.3 mol of epichlorohydrin was placed in a dropping funnel and slowly added dropwise to the four-necked flask. After the dr...

Embodiment 2

[0029] A preparation method for oil field water injection treatment bactericide, comprising the following steps:

[0030] S1. Preparation of low-molecular-weight chitosan: The completely dried chitosan powder sample is placed in an irradiation tube, and nitrogen is introduced for 5 minutes to remove oxygen, and then the seal is sealed. 60 Degradation by γ-ray irradiation was carried out in the Co radioactive source room, the irradiation dose was 50kGy, and the irradiation time was 17h, and low molecular weight chitosan was obtained, and its viscosity average molecular weight was 100kDa;

[0031] S2, the preparation of quaternary ammonium salt etherifying agent: in a four-necked flask equipped with a thermometer, mechanical stirring and reflux condensation, add 0.1 mol of N,N-dimethyldodecyl tertiary amine, turn on heating and mechanical stirring , put 0.2 mol of epichlorohydrin in a dropping funnel and slowly add it dropwise to the four-necked flask. After the dropwise additio...

Embodiment 3

[0034] A preparation method for oil field water injection treatment bactericide, comprising the following steps:

[0035] S1. Preparation of low-molecular-weight chitosan: The completely dried chitosan powder sample is placed in an irradiation tube, and nitrogen is introduced for 5 minutes to remove oxygen, and then the seal is sealed. 60 Degradation by γ-ray irradiation was carried out in the Co radioactive source room, the irradiation dose was 100kGy, and the irradiation time was 33h to obtain low-molecular-weight chitosan with a viscosity-average molecular weight of 65kDa;

[0036] S2, the preparation of quaternary ammonium salt etherifying agent: in a four-necked flask equipped with a thermometer, mechanical stirring and reflux condensation, add 0.1 mol of N,N-dimethyltetradecyl tertiary amine, turn on heating and mechanical stirring , put 0.5mol of epichlorohydrin in a dropping funnel and slowly dropwise add it to the four-necked flask. After the dropwise addition is comp...

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Abstract

The invention belongs to the technical field of oilfield water treatment, and particularly relates to a bactericide for oilfield water injection treatment and a preparation method thereof.The preparation method comprises the following steps that S1, low-molecular-weight chitosan is prepared, specifically, a chitosan sample is subjected to irradiation degradation with 60Co gamma rays, and the low-molecular-weight chitosan is obtained; s2, preparing a quaternary ammonium salt etherifying agent: dropwise adding epichlorohydrin into N, N-dimethyl long-chain alkyl tertiary amine, and reacting at a constant temperature to obtain the quaternary ammonium salt etherifying agent; s3, preparation of the bactericide: adding an acetic acid solution into the low-molecular-weight chitosan obtained in the S1, uniformly stirring to obtain a chitosan solution, then adding the quaternary ammonium salt etherifying agent obtained in the S2, and carrying out constant-temperature reaction to obtain the low-molecular-weight chitosan quaternary ammonium salt bactericide. Chitosan is degraded through < 60 > Co gamma ray irradiation, quaternary ammonium salt groups with long-chain alkyl and antibacterial performance are loaded to obtain the environment-friendly bactericide, and the environment-friendly bactericide is small in dosage, efficient in sterilization and environment-friendly and can meet the production requirements of oil fields.

Description

technical field [0001] The invention belongs to the technical field of oilfield water treatment, and in particular relates to a bactericide for oilfield water injection treatment and a preparation method thereof. Background technique [0002] With the reduction of oil content in oil fields, most oilfields in my country have entered the water flooding stage of tertiary oil recovery, and the water content of produced fluids increases year by year. These high water-cut produced fluids need to be separated from oil and water. It is injected back into the formation to maintain sufficient formation pressure. Due to the high water content of the produced fluid, there are a large number of bacterial microorganisms that are not conducive to water injection and oil recovery, such as sulfate-reducing bacteria, saprophytic bacteria, iron bacteria etc. According to research and analysis, sulfate-reducing bacteria is one of the main factors of microbial corrosion, and only sulfate-reduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/16A01N43/20A01P1/00C02F1/50C02F103/10
CPCA01N43/16A01N43/20C02F1/50C02F2103/10Y02W10/10
Inventor 王晓慧张本尚黎振华范家霖王娴王宏正陈海军李向辉李灿然邓刚华成武遆永周董明静张悦
Owner 河南省科学院同位素研究所有限责任公司
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