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The Performance Of HPHT Corrosion Inhibitor At Offshore Downhole Sour Conditions

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As traditional reserves deplete onshore and offshore, the oil industry is moving into increasingly deeper waters and harsh environments in the pursuit of hydrocarbons. As the industry drills deeper, the challenges that face infrastructure increase markedly with the longstanding issues of corrosion. One of the major challenges to corrosion management is the extreme pressure and temperature.

Product Number: 51322-17752-SG
Author: Youngil Choi, Youngsun Yim, Bang Cha Rang Song, George Economopoulos
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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High pressure, high temperature (HPHT) corrosion in sour conditions is a major concern in oil and gas production. Here, the selection of corrosion inhibitor is a significant challenge in oil and gas industry. This paper presents the results using HPHT Hastelloy RC autoclave for the performance study of corrosion inhibitor with high H2S/CO2 environments and high shear stress of 25 Pa in 80 % water cut. The sour corrosion testing conditions were the combination of 16.8 bar H2S concentration and 12 bar CO2 concentration with the temperature of 121 oC. Triplicate API 5L X65 weight-loss coupons were used in the test. Some important standard tests (e.g. thermal stability, emulsification tendency, foaming tendency, and solubility) with material compatibility test (Alloy 825) were also presented. The test results show that the average corrosion rates using weight-loss coupons are less than 0.1 mm/yr with low corrosion inhibitor concentration. No pitting corrosion was observed.

High pressure, high temperature (HPHT) corrosion in sour conditions is a major concern in oil and gas production. Here, the selection of corrosion inhibitor is a significant challenge in oil and gas industry. This paper presents the results using HPHT Hastelloy RC autoclave for the performance study of corrosion inhibitor with high H2S/CO2 environments and high shear stress of 25 Pa in 80 % water cut. The sour corrosion testing conditions were the combination of 16.8 bar H2S concentration and 12 bar CO2 concentration with the temperature of 121 oC. Triplicate API 5L X65 weight-loss coupons were used in the test. Some important standard tests (e.g. thermal stability, emulsification tendency, foaming tendency, and solubility) with material compatibility test (Alloy 825) were also presented. The test results show that the average corrosion rates using weight-loss coupons are less than 0.1 mm/yr with low corrosion inhibitor concentration. No pitting corrosion was observed.

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