Compound of sterilization and deoxygenation agent in high salinity oilfield water system

doi:10.19965/j.cnki.iwt.2021-1203

Abstract

Abstract:

A bactericidal deoxidizer composed of mixed amino acid copper，dodecyl dimethyl ammonium chloride and D-sodium erythorbate sodium was developed and applied to oilfield water system. The bactericidal and deoxygenation performance of the compound reagent under simulated water quality of high-salinity oilfields was studied. The bactericidal performance test showed that the compound reagent had a good bactericidal effect on the three common bacteria of SRB，TGB and IB in the oil field. The bactericidal rate of attached dirt-layer bacteria was above 98%，and the bactericidal rate of scattered bacteria was above 99%. Between 40-80 ℃，it could reach a dirt-layer sterilization rate of more than 98%，and achieve efficient and rapid sterilization within 12 h. The deoxygenation test showed that the deoxygenation efficiency of the compound agent could reach more than 99% at temperature of 30-70 ℃ or pH of 6-10. The bactericidal deoxidizer could be well applied to the high-salinity water quality of an oilfield water system in Northwest China.

Key words: sterilization, deoxygenation, amino acid copper, oilfield water system

摘要：

研制了一种由混合氨基酸络合铜、双癸基二甲基氯化铵（DDAC）和D-异抗坏血酸钠复配的杀菌除氧剂，应用于油田水系统。研究了此杀菌除氧剂在高矿化度油田模拟水质下的杀菌和除氧性能。杀菌性能测试表明，复配试剂对油田常见的SRB、TGB和IB这3种细菌都具有很好的灭杀效果，附着型垢层细菌的杀菌率在98%以上，游离型细菌的杀菌率在99%以上。该试剂在40~80 ℃温度区间能达到98%以上的垢层杀菌率，且能实现12 h内的高效快速杀菌。除氧测试表明，复配试剂在温度为30~70 ℃或pH为6~10的范围内，除氧率能达到99%以上。此杀菌除氧剂能很好地适用于西北某油田水系统的高矿化度水质。

关键词: 杀菌, 除氧, 氨基酸铜, 油田水系统

CLC Number:

X741

Bin YAO, Xiaojing WEI, Duolong GAO, Xiaohu WEN, Tianhui REN. Compound of sterilization and deoxygenation agent in high salinity oilfield water system[J]. Industrial Water Treatment, 2022, 42(9): 167-174.

姚彬, 魏晓静, 高多龙, 闻小虎, 任天辉. 高矿化度油田水系统杀菌除氧剂的复配研究[J]. 工业水处理, 2022, 42(9): 167-174.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-1203

https://www.iwt.cn/EN/Y2022/V42/I9/167

Figures/Tables 12

Table 1 Simulated water quality of water system in the oilfield in Northwest China（high salinity salt solution）

盐种类	CaCl₂	MgCl₂	NaCl	Na₂SO₄	NaHCO₃
浓度/（mol·L^-1）	2.90	0.64	2.98	1.56	0.03

Fig. 1 FTIR spectra of mixed amino acid and amino acid copper

Table 2 The bactericidal effects of three kinds of reagent on the dirt-layer SRB，TGB and IB

细菌种类	杀菌率/%
细菌种类	杀菌剂（100 mg/L DDAC）	杀菌复配剂（100 mg/L DDAC+30 mg/L AA-Cu）	杀菌除氧剂（100 mg/L DDAC+30 mg/L AA-Cu+70 mg/L DSE）
SRB	58.33	99.58	99.50
TGB	64.29	99.29	99.14
IB	45.45	98.91	98.18

Fig. 2 SEM and EDS images of the dirt layer of the blank group（a） and the experimental group with the sterilization deoxidizer（b）

Fig. 3 Schematic diagram of synergistic sterilization of mixed amino acid copper and DDAC

Fig. 4 The sterilization rate of the bactericidal deoxidizer to the dirt-layer SRB，TGB and IB changes with temperature

Fig. 5 The sterilization rate of the bactericidal deoxidizer to the dirt-layer SRB，TGB and IB changes with time

Fig. 6 The sterilization rate of the bactericidal deoxidizer to the dirt-layer SRB，TGB and IB changes with the mass concentration of DDAC

Fig. 7 The bactericidal effect of three kinds of reagent on scattered SRB，TGB and IB

Fig. 8 The curve of the deoxygenation rate of the three kinds of reagent with the reaction temperature

Fig. 9 The curve of deoxygenation rate of three kinds of reagent with pH

Fig. 10 The curve of deoxygenation rate with the mass concentration of DSE

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