Performance of Two New Surfactants as Acidizing Inhibitors for Oil and Gas Fields

doi:10.11902/1005.4537.2020.124

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (4): 542-548 DOI: 10.11902/1005.4537.2020.124

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Performance of Two New Surfactants as Acidizing Inhibitors for Oil and Gas Fields

WANG Dingli¹, LI Yongming¹(

), JIANG Liming², CHEN Bo¹, LUO Ang¹

^1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
^2.Heavy Oil Development Company, Xinjiang Oilfield Company, Karamay 834000, China

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Abstract

In view of the high toxicity and high cost of the current corrosion inhibitors, a new type of surfactant corrosion inhibitor was synthesized using two green raw materials of erucic acid and oleic acid, and the performance of the two corrosion inhibitors for P110 steel in 15% (mass fraction) hydrochloric acid solution were assessed by means of mass loss measurement, electrochemical measurement, Scanning Kelvin probe (SKP) and scanning electron microscope (SEM). Results show that the two corrosion inhibitors have good corrosion inhibition effects at 90 ℃ and can be used as effective corrosion inhibitors for oil and gas field acidification. In comparison with the P110 steel tested in the blank 15%HCl solution, the surface morphology of the same steel tested in the 15%HCl solution with addition of the two corrosion inhibitors maintained a better state, indicating that the two corrosion inhibitors had a good effect. Finally, through quantum chemical calculation, the synthetic corrosion inhibitor has been proved to be effective from the perspective of molecular calculation, and the correlation between experimental and theoretical results has also been demonstrated.

Key words: inhibitor electrochemical surfactant acid solution

Received: 17 July 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(U19A2043)

Corresponding Authors: LI Yongming E-mail: swpifrac@163.com

About author: LI Yongming, E-mail: swpifrac@163.com

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	Dingli WANG
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	Bo CHEN
	Ang LUO

Cite this article:

WANG Dingli, LI Yongming, JIANG Liming, CHEN Bo, LUO Ang. Performance of Two New Surfactants as Acidizing Inhibitors for Oil and Gas Fields. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 542-548.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.124 OR https://www.jcscp.org/EN/Y2021/V41/I4/542

Fig.1 Surfactant synthesis route

Table 1 Mass loss experimental results of DEER and DEOD inhibitors

Fig.2 Potentiodynamic polarization curves of DEER inhibitor (a) and DEOD inhibitor (b)

Table 2 Fitting results of potentiodynamic polarization curves of DEER and DEOD inhibitor

Fig.3 Nyquist plots for mild steel tested in 15%HCl solution in DEER inhibitor (a) and DEOD inhibitor (b)

Fig.4 Frequency (a, b) and phase angle (c, d) test results in DEER inhibitor (a, c) and DEOD inhibitor (b, d)

Fig.5 Equivalent circuit for inhibitors in 15%HCl solution

Table 3 Fitting results of EIS parameters

Fig.6 Potential distribution images of specimens before and after immersion in 15%HCl solution: (a) before immersion; (b) after absence inhibitor; (c) after presence the DEER; (d) after presence the DEOD

Fig.7 SEM images of mild steel specimens before and after immersion in 15%HCl solution: (a) before immersion; (b) after immersion in uninhibited solution; (c) after immersion with DEER; (d) after immersion with DEOD

Fig.8 Optimal structures, the distributions of molecular orbital for two surfactants DEER (a) and DEOD (b)

Table 4 Quantum chemical calculation results

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