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11125 Elemental Sulfur Corrosion and Inhibition in the Presence of Sulfur Solvent

Picture for 11125 Elemental Sulfur Corrosion and Inhibition in the Presence of Sulfur Solvent
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Product Number: 51300-11125-SG
ISBN: 2011 11125 CP
Author: Hejian Sun, Haitao Fang, Josh Davis, Roger Hudgins
Publication Date: 2011
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$20.00
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Elemental sulfur is often produced by sour gas wells and carried by the sour gas during the production and transportation. When temperatures and pressures change, sulfur may first precipitate out from the sour gas and then deposit on the production tubing or pipeline wall. Sulfur deposition can significantly affect the production by blocking the production tubing. In the presence of water, sulfur can also lead to a catastrophic corrosion problem. Applying the combination of sulfur solvent and corrosion inhibitor to the gas production is the most common way to mitigate the blockage and corrosion problems caused by sulfur deposition.

The objective of this project is to develop and evaluate the testing protocol for screening the elemental sulfur solvent and sulfur corrosion inhibitor. In this project, two sulfur solvents (SA and SC) and two corrosion inhibitors (CIB1 and CIB2) were investigated. All tests were conducted in autoclaves. Solvent efficiency was studied first, followed with the corrosion study. In the corrosion study, the steel surfaces with or without direct contact with sulfur were both simulated by putting an under-deposit specimen covered with sulfur on the bottom of the autoclave, and an electrochemical electrode not in contact with sulfur, directly above the under-deposit specimen. The experimental results suggest that the test apparatus and newly developed test protocol were proven to be able to screen the elemental sulfur solvent and sulfur corrosion inhibitor.

Keywords: Elemental sulfur, deposition, corrosion, sulfur solvent, sulfur corrosion inhibitor, testing protocol, under-deposit.
Elemental sulfur is often produced by sour gas wells and carried by the sour gas during the production and transportation. When temperatures and pressures change, sulfur may first precipitate out from the sour gas and then deposit on the production tubing or pipeline wall. Sulfur deposition can significantly affect the production by blocking the production tubing. In the presence of water, sulfur can also lead to a catastrophic corrosion problem. Applying the combination of sulfur solvent and corrosion inhibitor to the gas production is the most common way to mitigate the blockage and corrosion problems caused by sulfur deposition.

The objective of this project is to develop and evaluate the testing protocol for screening the elemental sulfur solvent and sulfur corrosion inhibitor. In this project, two sulfur solvents (SA and SC) and two corrosion inhibitors (CIB1 and CIB2) were investigated. All tests were conducted in autoclaves. Solvent efficiency was studied first, followed with the corrosion study. In the corrosion study, the steel surfaces with or without direct contact with sulfur were both simulated by putting an under-deposit specimen covered with sulfur on the bottom of the autoclave, and an electrochemical electrode not in contact with sulfur, directly above the under-deposit specimen. The experimental results suggest that the test apparatus and newly developed test protocol were proven to be able to screen the elemental sulfur solvent and sulfur corrosion inhibitor.

Keywords: Elemental sulfur, deposition, corrosion, sulfur solvent, sulfur corrosion inhibitor, testing protocol, under-deposit.
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