Synthesis and performance of a novel acidizing corrosion inhibitor for high temperature reservoirs

doi:10.16085/j.issn.1000-6613.2023-1615

Abstract

Abstract:

In order to better slow down the corrosion of metal under high temperature acidification in oil and gas fields, a compound acidizing corrosion inhibitor with high temperature resistance and simple formula was investigated. A novel fused heterocyclic quaternary ammonium salt (BQD) was prepared by 'one-pot' reaction with quinoline and benzyl chloride as raw materials. A novel high temperature acidizing corrosion inhibitor GS-1 with simple formula was obtained by weight loss method optimization of single factor analysis with synthetic BQD as the main agent, adding formic acid, urotropine and other compound agents. At the same time, its inhibition performance was studied by electrochemical test, surface morphology analysis and quantum chemical calculation. And the inhibition mechanism of BQD was studied by molecular simulation. The results showed that when the dosage of GS-1 corrosion inhibitor was 3%, the corrosion rates of N80 steel sheets in hydrochloric acid and mud acid at 160℃ were 41.63g/(m²·h) and 31.94g/(m²·h), respectively, which were better than the requirements of industry standards. The high temperature inhibitor GS-1 could form an adsorption protective film on the surface of N80 steel sheets, which could inhibit the mixed corrosion inhibitor of anode and cathode reaction at the same time. Quantum chemical calculations and molecular dynamics simulations indicated that the corrosion inhibition activity of BQD was better than that of the common benzylquinoline quaternary ammonium salt corrosion inhibitor (BQC). At the same time, the BQD molecule was based on the conjugated plane and was adsorbed on the interface at an angle parallel to the metal substrate, which had more better inhibition performance.

Key words: novel fused heterocyclic quaternary ammonium salt, corrosion inhibition performance, high temperature acidizing, corrosion, electrochemistry, quantum chemical calculation, molecular simulation

摘要：

为了更好地减缓油气田高温酸化下金属的腐蚀，研究出一种耐高温且配方简单的复合酸化缓蚀剂。以喹啉和氯化苄为原料，采用“一锅法”制备得到了一种新型稠杂环季铵盐（BQD）缓蚀主剂。通过添加甲酸、乌洛托品等复配剂，经过单因素失重法优选，得到一种配方简单的新型高温酸化缓蚀剂GS-1，通过电化学测试、表面形貌分析研究其缓蚀性能，采用分子模拟的方法研究BQD的缓蚀机理。结果表明，GS-1缓蚀剂在添加量为3%时，在160℃下盐酸与土酸的酸化环境中，N80钢片的腐蚀速率分别降低至41.63g/(m²·h)、31.94g/(m²·h)，均可达行业标准要求；GS-1缓蚀剂可在N80钢片表面形成一层吸附保护层，属于兼具抑制阳极和阴极反应的混合型缓蚀剂；量子化学计算及分子动力学模拟表明，BQD的缓蚀活性优于常见的苄基喹啉季铵盐缓蚀剂（BQC），同时BQD分子是以共轭平面为基准，与金属基底平行的角度被吸附于界面上，具有更加高效的缓蚀性能。

关键词: 新型稠杂环季铵盐, 缓蚀性能, 高温酸化, 腐蚀, 电化学, 量子化学计算, 分子模拟

CLC Number:

TQ047.6

WANG Yefei, WANG Jing, YANG Zhen, YANG Jiang, GUO Lei. Synthesis and performance of a novel acidizing corrosion inhibitor for high temperature reservoirs[J]. Chemical Industry and Engineering Progress, 2024, 43(10): 5712-5722.

王业飞, 王婧, 杨震, 杨江, 郭雷. 新型高温酸化缓蚀剂的制备及性能评价[J]. 化工进展, 2024, 43(10): 5712-5722.

Figures/Tables 24

References 23

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元素	理论值	实测值
C	81.62%	80.99%
H	4.89%	4.71%
N	5.95%	5.89%

元素	理论值	实测值
C	81.62%	80.99%
H	4.89%	4.71%
N	5.95%	5.89%

溶剂	BQD溶解度/g	溶解性
水	<0.01	难溶
乙腈	6.13	可溶
甲酸	25.46	易溶
乙醇	4.18	可溶
DMF	18.51	易溶
DMSO	13.85	易溶
异丙醇	5.27	可溶

溶剂	BQD溶解度/g	溶解性
水	<0.01	难溶
乙腈	6.13	可溶
甲酸	25.46	易溶
乙醇	4.18	可溶
DMF	18.51	易溶
DMSO	13.85	易溶
异丙醇	5.27	可溶

缓蚀剂	添加量 /%	b_a/mV·dec^-1	-b_c/mV·dec^-1	i_corr/μA·cm^-2	–E_corr/mV	ΔE_corr/mV	IE /%
空白	0	120.96	133.00	2271.10	428.23	—	—
GS-1	0.5	151.14	220.21	123.87	416.78	11.45	94.55
	1.0	136.99	298.02	93.36	410.57	17.66	95.89
	1.5	132.86	227.90	89.61	416.68	11.55	96.05
	2.0	128.31	203.69	58.56	406.55	21.68	97.42