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Material qualification of a 13Cr-L80 casing for sour conditions

  • Qishuai Yin , Jin Yang , Haimei Xiu , Shujie Liu , Zhenkun Li , Caiyuan Tan , Tie Li , Shaowei Zhao , Ting Sun , Wenlong Li and Shanshan Shi
Published/Copyright: August 30, 2019
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Abstract

This work aims to determine the material qualification of 13Cr-L80 casing for sour conditions which is of great importance to check the sulfide stress cracking susceptibility, confirm the range of applicable conditions and recommend anti-corrosion materials. First, the casing material was tested to judge whether its properties were normal. Secondly, the testing matrix was defined to determine actual casing exposure conditions. Thirdly, slow strain rate testing was used to screen the conditions. Fourthly, thirty-day tests of uniaxial tensile specimens were conducted to check for SSC susceptibility. The casing material satisfied API 5CT standards and could be used for slow strain rate testing and sulfide stress cracking testing. The testing matrix is intended to distinguish the combined effect of temperatures (41, 75, 140 °F), chloride levels (1000, 13 000 mg × L−1), pH (3.5, 5.5) and partial pressures of H2S (3.5 psi) in shut-in and flowing conditions. The slow strain rate testing showed a reduction of signs of embrittlement with increased temperature, suggesting that the mechanism is supported by sulfide stress cracking. The 13Cr-L80 passed field-specific qualification tests for sulfide stress cracking resistance in sour wells at maximum H2S partial pressures of 3.5 psi in the casing-tubing annulus. The API 5CT 13Cr-L80 casing application is in compliance with ISO15156/NACE MR0175 standards as long as the aggressiveness of the field conditions does not go beyond the envelope conditions tested (3.5 psi of H2S, pH 3.5, temperature of 41 or 75 °F).


Correspondence Address, Prof. Dr. Jin Yang, College of Safety and Ocean Engineering, China University of Petroleum-Beijing, 18 Fuxue Rd., Changping Dist., Beijing, 102249, P. R. China, E-mail:

Dr. Qishuai Yin, born in 1991, is a Ph.D. candidate at the China University of Petroleum-Beijing, specializing in materials testing and evaluation of petroleum & natural gas engineering field.

Prof. Dr. Jin Yang, born in 1966, is Professor and Vice-President at the College of Safety and Ocean Engineering, China University of Petroleum-Beijing, and specializes in offshore drilling engineering and materials testing.

Haimei Xiu, born in 1977, is Project Manager of CNOOC China Limited, Pengbo Operating Company, Tianjin, China and specializes in materials testing and evaluation of petroleum & natural gas engineering field.

Dr. Shujie Liu, born in 1966, is Professor Senior Engineer, Chief Engineer and President of the Drilling & Production Research Institute of the CNOOC Research Institute Co., Ltd., Beijing, China, specializing in offshore drilling engineering and materials testing.

Zhenkun Li, born in 1980, is Chief Engineer of CNOOC Ener Tech-Drilling & Production Co. Tianjin, and specializes in materials testing.

Caiyuan Tan, born in 1980, is Deputy Project Manager of the CNOOC China Limited, Pengbo Operating Company, Tianjin, China and specializes in offshore drilling engineering.

Tie Li, born in 1979, is Material Supervisor Engineer of CNOOC China Limited, Pengbo Operating Company, Tianjin, China and specializes in materials testing.

Shaowei Zhao, born in 1984, is Resource Coordination Supervisor Engineer at the Tianjin Branch of the China National Offshore Oil Co., Ltd. Tianjin, China and specializes in offshore drilling engineering.

Dr. Ting Sun, born in 1981, is a Lecturer at the College of Safety and Ocean Engineering, China University of Petroleum, Beijing, China and specializes in offshore drilling engineering.

Dr. Wenlong Li, born in 1991, is a Ph.D. candidate and Research Assistant at the MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, China and specializes in offshore drilling engineering.

Shanshan Shi, born in 1993, is a Master's candidate, China University of Petroleum, Beijing, China and specializes in offshore drilling engineering.


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Published Online: 2019-08-30
Published in Print: 2019-08-30

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