Numerical analysis of cathodic protection of a Q355ND frame in a shallow water subsea Christmas tree

Shaodong Ju; Yuming Liu; Qishuai Yin; Xing Wang; Shiqiang Wang; Zitao Jiang; Siyao Deng

doi:10.1515/mt-2023-0394

Artikel

Numerical analysis of cathodic protection of a Q355ND frame in a shallow water subsea Christmas tree

Shaodong Ju
Shaodong Ju, Ph.D., Senior Engineer, born in 1984, graduated from China University of Petroleum (East China) with a Ph.D. majoring in Mechanical Design and Theory, now engaged in the research and development of underwater oil recovery tree system equipment in CNOOC Energy Development Co.
, Yuming Liu
Yuming Liu, Master, Senior Engineer, born in 1981, graduated from Southwest Petroleum University, majoring in Petroleum and Natural Gas Engineering, now engaged in the management of offshore oil drilling technology in CNOOC Energy Development Co.
, Qishuai Yin
Qishuai Yin, Ph.D., Associate Professor, born in 1991, graduated from China University of Petroleum (Beijing) with a Ph.D. degree in oil and gas well engineering, now mainly engaged in offshore oil and gas safety and other related research in the Department of Safety Engineering, School of Safety and Ocean Engineering, China University of Petroleum (Beijing).
, Xing Wang
Xing Wang, Master, Senior Engineer, born in 1985, graduated from Southwest University of Petroleum, majoring in offshore oil and gas engineering, now engaged in the research and development and management of underwater oil recovery tree system in CNOOC Energy Development Co.
, Shiqiang Wang
Shiqiang Wang, M.S., Engineer, born in 1987, graduated from Tianjin University of Science and Technology, majoring in Mechanical Design and Automation, now engaged in the research and development of underwater oil production tree system equipment in CNOOC Energy Development Co.
, Zitao Jiang
Zitao Jiang, Ph.D., Associate Professor. Born in 1986, he graduated from the University of Science and Technology Beijing with a PhD degree in Materials Science. Now mainly engaged in pipeline corrosion and protection and other related research in the Department of Oil and Gas Storage and Transportation Engineering, School of Mechanical and Storage and Transportation Engineering, China University of Petroleum (Beijing).
und Siyao Deng
Siyao Deng, M.S., Student, born in 2001, now studying at the China University of Petroleum (Beijing), majoring in Safety Science and Engineering.

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Abstract

This study develops a 3D model of a Christmas tree using cathodic protection technology and conducts numerical simulations on the Q355ND framework of a shallow Christmas tree. The boundary element method is employed for modeling, examining the distribution of protection potentials under varying corrosion layer breakage rates, anode numbers, and positions. The influence of sacrificial anode parameters on the cathodic protection effect of the Christmas tree is also investigated. The findings reveal that when the breakage rate of the anticorrosion layer reaches 35 % during Christmas tree operation, the sacrificial anode fails to provide complete protection. However, if the coating breakage rate is 10 %, reducing the number of anodes by six can still achieve a protection potential of −850 mV. Thus, it is imperative for Christmas trees to maintain a corrosion protection layer breakage rate below 35 %. Beyond this threshold, sacrificial anodes exhibit minimal effectiveness in preserving their integrity.

Keywords: anticorrosion coating; cathodic protection technology; Christmas tree; Q355ND frame; numerical simulation

Corresponding author: Qishuai Yin, Department of Safety Engineering, China University of Petroleum Beijing, Changping-qu, China, E-mail: yinqs@cup.edu.cn

Funding source: National Key Research and Development Program of China

Award Identifier / Grant number: No. 2022 YFC2806100

Funding source: Ministry of Industry and Information Technology of the People’s Republic of China

Award Identifier / Grant number: WK2023575

About the authors

Shaodong Ju

Shaodong Ju, Ph.D., Senior Engineer, born in 1984, graduated from China University of Petroleum (East China) with a Ph.D. majoring in Mechanical Design and Theory, now engaged in the research and development of underwater oil recovery tree system equipment in CNOOC Energy Development Co.

Yuming Liu

Yuming Liu, Master, Senior Engineer, born in 1981, graduated from Southwest Petroleum University, majoring in Petroleum and Natural Gas Engineering, now engaged in the management of offshore oil drilling technology in CNOOC Energy Development Co.

Qishuai Yin

Qishuai Yin, Ph.D., Associate Professor, born in 1991, graduated from China University of Petroleum (Beijing) with a Ph.D. degree in oil and gas well engineering, now mainly engaged in offshore oil and gas safety and other related research in the Department of Safety Engineering, School of Safety and Ocean Engineering, China University of Petroleum (Beijing).

Xing Wang

Xing Wang, Master, Senior Engineer, born in 1985, graduated from Southwest University of Petroleum, majoring in offshore oil and gas engineering, now engaged in the research and development and management of underwater oil recovery tree system in CNOOC Energy Development Co.

Shiqiang Wang

Shiqiang Wang, M.S., Engineer, born in 1987, graduated from Tianjin University of Science and Technology, majoring in Mechanical Design and Automation, now engaged in the research and development of underwater oil production tree system equipment in CNOOC Energy Development Co.

Zitao Jiang

Zitao Jiang, Ph.D., Associate Professor. Born in 1986, he graduated from the University of Science and Technology Beijing with a PhD degree in Materials Science. Now mainly engaged in pipeline corrosion and protection and other related research in the Department of Oil and Gas Storage and Transportation Engineering, School of Mechanical and Storage and Transportation Engineering, China University of Petroleum (Beijing).

Siyao Deng

Siyao Deng, M.S., Student, born in 2001, now studying at the China University of Petroleum (Beijing), majoring in Safety Science and Engineering.

Research ethics: All research activities conducted for the preparation of this manuscript have been conducted in accordance with relevant ethical guidelines and regulations. This includes obtaining necessary approvals, informed consent from participants, and adherence to ethical standards for data collection, analysis, and reporting.
Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The authors state no conflict of interest.
Research funding: This paper is financially supported by the National Key Research and Development Program (No. 2022YFC2806100) and Major Science and Technology Project of CNOOC Energy Technology & Services Limited (No. HFKJ-ZX-GJ-2022-05).
Data availability: The raw data can be obtained on request from the corresponding author.

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Published Online: 2024-07-15

Published in Print: 2024-09-25

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Schlagwörter für diesen Artikel

anticorrosion coating; cathodic protection technology; Christmas tree; Q355ND frame; numerical simulation