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Volume 10
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10.3390/pr10122685
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Article

How to Choose the Suitable Steel of Wellhead, Wellbore, and Downhole Tools for Acid Gas Reinjection Flooding

by
Yudi Geng
1,*,
Zhendong Liu
2,*,
Wenguang Zeng
1,
Yibo Feng
1,
Baodong Ding
1,
Wenxia Li
1 and
Qinying Wang
3
1
Petroleum Engineering Technology Research Institute, Sinopec Northwest Oilfield Company, Urumchi 830011, China
2
State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
3
Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
*
Authors to whom correspondence should be addressed.
Processes 2022, 10(12), 2685; https://doi.org/10.3390/pr10122685
Submission received: 8 October 2022 / Revised: 24 October 2022 / Accepted: 25 October 2022 / Published: 13 December 2022
(This article belongs to the Special Issue Erosion and Corrosion Mechanism and Control Method of Energy and Chemical Equipment)
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Abstract

The material selection of injection gas wells in acid gas flooding is the bottleneck of the successful implementation of the technical scheme. Through standard and literature research, the materials of the wellhead, wellbore, and packer for reinjection well in acid gas flooding are preliminarily established, and then the suitable materials are further screened by using the weight-loss and surface characterization method. Finally, a new type of packer is designed to optimize the wellbore material. The results show that 35CrMo (CR = 0.0589 mm/y) steel is used for wellhead materials, 625 alloy steel is selected as the sealing surface, and 625 or 825 alloys (with CR ≤ 0.0055 mm/y) steel is used for wellhead sealing material. The main material of the packer is 718 Alloy (with CR ≤ 0.0021 mm/y). The cost of T95 steel within 20 years (1263 ten thousand yuan) of service is much smaller than that of G3 alloy (1771 ten thousand yuan), but after 30 years of service, its cost is close to that of G3 alloy. A kind of downhole packer for acid gas reinjection is designed. Among them, G3 alloy steel tubing is used between the packer and the relief valve, T95 steel tubing is selected above the packer and below the safety valve, and the packer is set in the G3 steel tubing. The serious pitting corrosion of T95 steel in the liquid phase environment is due to the uneven deposition of FeS and FeCO3 on the steel surface.
Keywords: acid gas reinjection flooding; material selection scheme; CO2-H2S corrosion; pitting corrosion; packer device acid gas reinjection flooding; material selection scheme; CO2-H2S corrosion; pitting corrosion; packer device

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MDPI and ACS Style

Geng, Y.; Liu, Z.; Zeng, W.; Feng, Y.; Ding, B.; Li, W.; Wang, Q. How to Choose the Suitable Steel of Wellhead, Wellbore, and Downhole Tools for Acid Gas Reinjection Flooding. Processes 2022, 10, 2685. https://doi.org/10.3390/pr10122685

AMA Style

Geng Y, Liu Z, Zeng W, Feng Y, Ding B, Li W, Wang Q. How to Choose the Suitable Steel of Wellhead, Wellbore, and Downhole Tools for Acid Gas Reinjection Flooding. Processes. 2022; 10(12):2685. https://doi.org/10.3390/pr10122685

Chicago/Turabian Style

Geng, Yudi, Zhendong Liu, Wenguang Zeng, Yibo Feng, Baodong Ding, Wenxia Li, and Qinying Wang. 2022. "How to Choose the Suitable Steel of Wellhead, Wellbore, and Downhole Tools for Acid Gas Reinjection Flooding" Processes 10, no. 12: 2685. https://doi.org/10.3390/pr10122685

APA Style

Geng, Y., Liu, Z., Zeng, W., Feng, Y., Ding, B., Li, W., & Wang, Q. (2022). How to Choose the Suitable Steel of Wellhead, Wellbore, and Downhole Tools for Acid Gas Reinjection Flooding. Processes, 10(12), 2685. https://doi.org/10.3390/pr10122685

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