Layer | Fill | Outline |
---|
Map layers
Theme | Visible | Selectable | Appearance | Zoom Range (now: 0) |
---|
Fill | Stroke |
---|---|
Collaborating Authors
Results
Behavior Of Corrosion Inhibitor On The New Ultra High Strength Steel
Quintanilla, H. (Tenaris group Tamsa) | Inde, A. (Tenaris group Tamsa) | Aguilar, A. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa) | Esparza, R. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa) | Ascencio, J. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa) | Valdez, S. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa) | Pérez, R. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa) | Martínez, L. (Instituto de Ciencias Físicas-UNAM, Av. Universidad s/n, Col. Chamilpa)
ABSTRACT: Electrochemical techniques have been used for investigating the inhibition of new ultra high strength steel grade. This kind of steel has been developed with improved strength, toughness and weldability in order to be used in well pipeline for oil production and transportation in ultradeep water. Inhibitors play a key role in the control of corrosion associated with the production and transport of crude oil and gas. The polarization resistance, inhibitor efficiency and corrosion current density was determined in deaerated 3% NaCl + Diesel + inhibitors saturated with CO2 at 50 oC. The electrochemical technique used was the linear polarization resistance (LPR), obtaining the polarization curves and Tafel Extrapolation, in order to obtain the slopes tafel and the inhibitor efficiency, this one was determined from current density (icorr) values with and without inhibitor. It was found that the inhibitors displayed high inhibition efficiencies. INTRODUCTION: Due to the global energy demand, the petroleum industry has begun the exploration on ultra-deep water regions. This challenge implies the use of high strength steel pipe, in order to produce ultradeep water/oil and transport it with high-pressure at low cost. New ultra high strength steel has been developed by the combination of steel chemistry and the continuouscooling- transformation (CCT). The new ultra high strength steel has features such as a wide range of yield strength, improved toughness, delay fracture resistance and excellent weldability. These properties have been raised by low carbon equivalent composition, controlled temperature during the heat treatment and control of the microstructure. However, the inhibitor evaluation to protect against corrosion of new ultra high strength steel grade has not been studied yet. The high pressure on ultra deep water pipeline and the physicchemical properties of the crude oil production has an important influence on the pipeline corrosion. In keeping with all these considerations, the [1-(2-aminoethyl)-2-metil]-1,3-diazacyclopenta- 2,4-diene1 Eq. (1) was selected in this work, in order to study the corrosion of new steel and to determine the inhibitor dosage that get better inhibition corrosion and high efficiency. These experimental results will be used in the corrosion protection of well pipeline for the oil production in ultradeep water region. The [1-(2-aminoethyl)-2-metil]-1,3-diazacyclopenta-2,4-diene or amino imidazole inhibitor, is an aromatic heterocyclic with high hydrophobic character as well as high solubility in oil. In addition, the amino imidazole (also called: 1,3 diazole amino) inhibitor belongs to the filmic inhibitor family, and is considered as thermally stable organic nitrogenous bases, with polar group rich in electrons able to adhere to the steel surface through the coordination bond, in addition their hydrophobic group repels the pollutants presents in the sea water2,3. In order to study the efficiency of the inhibitor to protect ultra high strength steel used for well pipe oil in ultradeep water production, an electrochemical technique, linear polarization resistance (LPR) was used. This technique, allows measurements corrosion rate to be measured in real time. The technique is based on a continuous change of an electrode's potential in the vicinity of free corrosion potential.
- North America > Mexico (0.47)
- North America > United States > Texas (0.29)
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.50)
- Well Completion > Well Integrity > Subsurface corrosion (tubing, casing, completion equipment, conductor) (1.00)
- Production and Well Operations > Production Chemistry, Metallurgy and Biology (1.00)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Materials and corrosion (1.00)
Influence Of Ni Addition On Corrosion Behavior Of Steels For Deepwater Applications.
Quintanilla, H. (Tenaris Tamsa R., D.Via Xalapa) | Izquierdo, A. (Tenaris Tamsa R., D.Via Xalapa) | Valdez, S. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Esparza, R. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Aguilar, A. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Casales, M. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Ascencio, J.A. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Perez, R. (Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México) | Martínez, L. (Corrosión y, Protección Ingeniería S.C.Rio Nazas 6)
ABSTRACT: The interest in the use of high grade steel pipes for the construction of long distance pipelines is rapidly increasing, and is expected to become the main driving force for deepwater steel investigations. In response to this potential demand, the steel makers are making strong efforts to develop new grades of steel. In the present work, an ultra high-strength steel grade that far exceeds the conventional grades X65 and X80 has been studied to investigate the influence of minor alloying additions of nickel on the microstructural pattern and the corrosion resistance behavior. Nickel is commonly used to raise the strength of the steel. This kind of steel can exhibit different corrosion responses due to nickel content and the resulting differences in microstructural features. Electrochemical experiments further showed that nickel addition was detrimental to the corrosion resistance. The increase of nickel content has provided a microstructure refinement and a more extensive redistribution of the precipitation which has provoked a decrease on the corrosion resistance. INTRODUCTION: The development of high-grade steel pipes for oil and gas transportation pipelines is increasing, mainly in deepwater applications. This application requires the use of high-grade steels with mechanical properties which allows the internal pressure used for a given pipe thickness to be substantially increased. In recent times, the research has been focused on the development of API grade X100 [1] and more recently X120 [2]. These new grades are still under constant development. An increase in the strength of these steels is necessary for deepwater applications. It is due to very high operating pressures and others structural design conditions without increasing the pipe wall thickness. Weldability, formability, fracture toughness [3], resistance to hydrogen induced blister cracking in sour service environment and stress corrosion cracking resistance for underground service (especially with H2S environment) [4], are the basic requirements for oil and gas transportation through pipelines. It is important that the steel be characterized by a microstructure which defines the necessary mechanical and corrosion behaviors. The microstructure depends on the alloying chemistry, heat treatment process, thermo-mechanical process and rate of cooling [5]. The design of new chemical composition and/or improving the heat treatment process are the most common methods to improve the steels mechanical properties. Nickel, which is used as an alloying element in high-grade steels, is a ferrite strengthener [6]. Nickel does not form any carbide compounds in steel, therefore, it remains in solution in the ferrite, thus strengthening and toughening the ferrite phase. In combination with chromium, nickel produces steels with greater hardness, higher impact strength, and greater fatigue resistance [7]. Nickel alloy steels also have superior low-temperature strength and toughness. In the present work, a study of the microstructure of API X100 steels was carried out. The steels with Ni additions and without Ni additions (only residual) were melting by conventional casting. The characterization of the steels shows different structures to be present when nickel is present or not. Electrochemical experiments with both steels show different corrosion rates.
- North America > United States (0.47)
- North America > Mexico (0.30)