Study on the Corrosion Behavior of 22Cr Steel in HCl/HAc Solution at Ultra-High Temperature

GAO Kechao, SHANG Suogui, LIU Pingli, GAO Qiangyong, DU Juan, MA Jinxin

doi:10.16577/j.issn.1001-1560.2024.0093

Materials Protection >

2024 , Vol. 57 >Issue 4: 187 - 193

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0093

Study on the Corrosion Behavior of 22Cr Steel in HCl/HAc Solution at Ultra-High Temperature

Expand

(1. Tianjin Branch, CNOOC (China) Co., Ltd., Tianjin 300480, China;
2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

LIU Pingli（1973-）, Professor, Doctoral Supervisor, Research Focus: Oil and Gas Production Engineering and Fracturing and Acidizing，E-mail: liupingli@vip.163.com

Received date: 2023-05-04

Revised date: 2023-08-10

Accepted date: 2023-09-10

Online published: 2024-04-30

Supported by

Deep Acid Fracturing Reservoir Stimulation Technology for Lower Paleozoic Limestone Buried Hill Reservoirs in the Southwest Ring of Bozhong Depression(CCL2020TJX0NST1298)

Fold

Abstract

Acidizing is an effective and routine measure for oil and gas extraction, but acid liquor can cause severe corrosion to oil and gas pipeline columns, especially in high-temperature reservoirs. The high-temperature wells are often acidified by a combination of organic acids and hydrochloric acid to reduce the corrosion of oil and gas pipeline columns caused by acid. In order to effectively reduce the corrosion of oil and gas pipeline columns caused by acidizing, the high-temperature(200 ℃) corrosion behavior of 22Cr steel in various acidic solutions was studied through electrochemical experiments and weight loss experiments. The surface corrosion morphology of steel samples in different systems was observed using a scanning electron microscope(SEM). An X-ray energy dispersive spectrometer(EDS) was used to analyzed the elemental composition and distribution on the surfaces of samples before and after corrosion. X-ray diffraction(XRD) was utilized to determine the composition of corrosion products on the surface of samples. Results showed that 22Cr steel had good corrosion resistance in different concentrations of acetic acid solution, but the increase in Cl^- concentration in the acetic acid solution accelerated the corrosion of 22Cr steel. 22Cr steel was severely corroded in low-concentration HCl solution. The composite acid liquor system, composed of low concentration HCl and low concentration acetic acid, was found to have a synergistic effect on the corrosion of 22Cr steel and accelerated the corrosion of 22Cr steel. At 200 ℃, the composite inhibitor, composed of corrosion inhibitor QASE and corrosion inhibitor synergist Sb₂O₃, was effectively able to inhibit the corrosion of 22Cr steel in the hydrochloric acid and acetic acid composite acid solution.

Key words： 22Cr steel; ultra-high temperature; corrosion behavior; synergistic corrosion; composite acid

Cite this article

GAO Kechao, SHANG Suogui, LIU Pingli, GAO Qiangyong, DU Juan, MA Jinxin . Study on the Corrosion Behavior of 22Cr Steel in HCl/HAc Solution at Ultra-High Temperature[J]. Materials Protection, 2024 , 57(4) : 187 -193 . DOI: 10.16577/j.issn.1001-1560.2024.0093

Options

Outlines

模态框（Modal）标题

Abstract

Cite this article