Development of Domestic CT80S Sulfur Resistance Coiled Tubing

Abstract:

According to the demand of oil and gas field development with a small amount of hydrogen sulfide, CT80S sulfur resistance coiled tubing was developed through the raw materials and manufacturing technology. The microstructure, mechanical properties, fatigue life and corrosion resistance of the CT80S sulfur resistant coiled tubing were analyzed. The results showed that the microstructure of CT80S sulfur resistant coiled tubing was consisted of the ferrite and pearlite with the grain size of 12, banded structure of 1.0, and the inclusions was less than 1.0. The strength and hardness of the pipe meet the requirements of API Spec 5ST, and the hardness control was less than 18HRC. The pipe had excellent low cycle fatigue property, the mean fatigue life of Φ31.8 × 3.18mm tube was 1055 cycles when the internal pressure was 34.47MPa and the bending radius was 1219mm. According to NACE TM 0284 and NACE TM 0177 standard, the HIC and SCC performance tests were carried out in same solution. The results show that the developed tubing is insensitive to HIC and the resistance to sulfide stress corrosion is good, under 90%σs stress loading not break.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 355-361
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.355
• Online since: February 2018
• Authors: Zhong Wen Yang*, Hong Bin Li, Jing Li Wang, Zong Yue Bi
• Keywords: Coiled Tubing, Mechanical Properties, Microstructure, Stress Corrosion, Sulfur Resistance

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