Dataset Information

Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO?/Crude Oil/Brine Solution under 2?15 MPa at 30?80 °C.

ABSTRACT: This study aimed to evaluate the corrosion properties of J55 carbon steel immersed in CO?/crude oil/brine mixtures present in the wellbores of CO?-flooded production wells. The main corroded position of wellbore was determined and wellbore corrosion law was provided. Corrosion tests were performed in 30% crude oil/brine solution under the simulated temperature (30?80 °C) and pressure (2?15 MPa) conditions of different well depths (0?1500 m). The corrosion behavior of J55 carbon steel was evaluated through weight-loss measurements and surface analytical techniques, including scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction analysis, and optical digital microscopy. Corrosion rate initially increased and then decreased with increasing well depth, which reached the maximum value of 1050 m. At this well depth, pressure and temperature reached 11 MPa and 65 °C, respectively. Under these conditions, FeCO? and CaCO? localized on sample surfaces. Microscopy was performed to investigate corrosion depth distribution on the surfaces of the samples.

SUBMITTER: Bai H

PROVIDER: S-EPMC6317236 | biostudies-other | 2018 Nov

REPOSITORIES: biostudies-other

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Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO₂/Crude Oil/Brine Solution under 2⁻15 MPa at 30⁻80 °C.

Bai Haitao H Wang Yongqing Y Ma Yun Y Ren Peng P Zhang Ningsheng N

Materials (Basel, Switzerland) 20181126 12

This study aimed to evaluate the corrosion properties of J55 carbon steel immersed in CO₂/crude oil/brine mixtures present in the wellbores of CO₂-flooded production wells. The main corroded position of wellbore was determined and wellbore corrosion law was provided. Corrosion tests were performed in 30% crude oil/brine solution under the simulated temperature (30⁻80 °C) and pressure (2⁻15 MPa) conditions of different well depths (0⁻1500 m). The corrosion behavior of J55 carbon steel was evaluat ...[more]

PMID: 30486257

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Project description:Despite observations of steel corrosion in nitrate-reducing environments, processes of nitrate-dependent microbially influenced corrosion (MIC) remain poorly understood and difficult to identify. We evaluated carbon steel corrosion by Shewanella oneidensis MR-1 under nitrate-reducing conditions using a split-chamber/zero-resistance ammetry (ZRA) technique. This approach entails the deployment of two metal (carbon steel 1018 in this case) electrodes into separate chambers of an electrochemical split-chamber unit, where the microbiology or chemistry of the chambers can be manipulated. This approach mimics the conditions of heterogeneous metal coverage that can lead to uniform and pitting corrosion. The current between working electrode 1 (WE1) and WE2 can be used to determine rates, mechanisms, and, we now show, extents of corrosion. When S. oneidensis was incubated in the WE1 chamber with lactate under nitrate-reducing conditions, nitrite transiently accumulated, and electron transfer from WE2 to WE1 occurred as long as nitrite was present. Nitrite in the WE1 chamber (without S. oneidensis) induced electron transfer in the same direction, indicating that nitrite cathodically protected WE1 and accelerated the corrosion of WE2. When S. oneidensis was incubated in the WE1 chamber without an electron donor, nitrate reduction proceeded, and electron transfer from WE2 to WE1 also occurred, indicating that the microorganism could use the carbon steel electrode as an electron donor for nitrate reduction. Our results indicate that under nitrate-reducing conditions, uniform and pitting carbon steel corrosion can occur due to nitrite accumulation and the use of steel-Fe(0) as an electron donor, but conditions of sustained nitrite accumulation can lead to more-aggressive corrosive conditions.IMPORTANCE Microbially influenced corrosion (MIC) causes damage to metals and metal alloys that is estimated to cost over $100 million/year in the United States for prevention, mitigation, and repair. While MIC occurs in a variety of settings and by a variety of organisms, the mechanisms by which microorganisms cause this damage remain unclear. Steel pipe and equipment may be exposed to nitrate, especially in oil and gas production, where this compound is used for corrosion and "souring" control. In this paper, we show uniform and pitting MIC under nitrate-reducing conditions and that a major mechanism by which it occurs is via the heterogeneous cathodic protection of metal surfaces by nitrite as well as by the microbial oxidation of steel-Fe(0).

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Dataset Information

Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO?/Crude Oil/Brine Solution under 2?15 MPa at 30?80 °C.

Publications

Pitting Corrosion and Microstructure of J55 Carbon Steel Exposed to CO₂/Crude Oil/Brine Solution under 2⁻15 MPa at 30⁻80 °C.

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