Corrosion Characteristics of P110SS Casing Steel for Ultra-deep Well in Artificial Formation Water with Low H2S and High CO2 Content

doi:10.11902/1005.4537.2022.225

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 611-618 DOI: 10.11902/1005.4537.2022.225

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Corrosion Characteristics of P110SS Casing Steel for Ultra-deep Well in Artificial Formation Water with Low H₂S and High CO₂ Content

XING Xuesong¹, FAN Baitao¹, ZHU Xinyu², ZHANG Junying², CHEN Changfeng²(

)

^1.CNOOC Research Institute Co., Ltd., Beijing 100028, China
^2.School of New Energy and Materials, China University of Petroleum, Beijing 102249, China

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Abstract

The corrosion condition of ultra-deep oil- and gas-wells is simulated via a high-temperature and high-pressure reaction kettle that can adjust the temperature, H₂S- and CO₂- partial pressure of the artificial formation waters. The corrosion characteristics of P110SS steel in the artificial formation water by varying temperature, and H₂S- and CO₂-partial pressure, was assessed by means of immersion test, SEM, EDS and XRD. The results show that the corrosion rate of P110SS increased with the increase of H₂S and CO₂ partial pressure, but decreased with the increase of temperature. By analyzing the corrosion products, it is found that the change of H₂S-, CO₂- partial pressure and temperature will lead to the change of composition and structure of corrosion products. This shows that under the condition of high temperature and high pressure, the corrosion of H₂S is dominant, the corrosion product of Fe₇S₈ has poor protectiveness and thus the steel presents high corrosion rate, and the corrosion of CO₂ is dominant under the condition of low H₂S partial pressure, the corrosion rate depends on the compactness of the corrosion product film. However, the effect of temperature on the corrosion rate is more significant than that of CO₂.

Key words: P110SS casing steel low H₂S partial pressure corrosion rate composition of corrosion product film

Received: 07 July 2022 32134.14.1005.4537.2022.225

ZTFLH:

TG174

Corresponding Authors: CHEN Changfeng, E-mail: chen_c_f@163.com

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	XING Xuesong
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	ZHANG Junying
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Cite this article:

XING Xuesong, FAN Baitao, ZHU Xinyu, ZHANG Junying, CHEN Changfeng. Corrosion Characteristics of P110SS Casing Steel for Ultra-deep Well in Artificial Formation Water with Low H₂S and High CO₂ Content. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 611-618.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.225 OR https://www.jcscp.org/EN/Y2023/V43/I3/611

Condition	T / ℃	$p H 2 S$ / kPa	$p C O 2$ / MPa	t / h
Scheme 1	220	0/2/10/20	4	168
Scheme 2	100/140/180/220	2	10	168
Scheme 3	100	2	1/4/10	168
Scheme 3	220	2	1/4/10	168

Table 1 Weightloss test conditions for P110S oil casing steel

Fig.1 Corrosion rates of P110SS steel under conditions of 100~220 ℃ (a), 0~20 kPa $p H 2 S$ (b) and 1~10 MPa $p C O 2$ (c)

Fig.2 SEM surface morphologies of P110SS steel after corrosion at 220 ℃ under 4 MPa $p C O 2$ and 0 (a, e), 2 (b, f), 10 (c, g) and 20 kPa $p H 2 S$ (d, h)

Fig.3 XRD patterns (a) of P110SS steel after corrosion at 220 ℃ under 4 MPa $p C O 2$ and varied $p H 2 S$ , and corresponding EDS results of corrosion products formed under 2 kPa (b) and 20 kPa (c) $p H 2 S$

Fig.4 SEM morphologies of P110SS steel after corrosion under 2 kPa $p H 2 S$ and 4 MPa $p C O 2$ at 100 ℃ (a), 140 ℃ (b), 180 ^oC (c) and 220 ℃ (d)

Fig.5 XRD patterns of corrosion products formed on P110SS steel after corrosion under 2 kPa $p H 2 S$ and 4 MPa $p C O 2$ at different temperatures

Fig.6 SEM morphologies of P110SS after corrosion at 100 ℃ (a-c) and 220 ℃ (d-f) under 2 kPa $p H 2 S$ and 1 MPa (a, d), 4 MPa (b, e) and 10 MPa (c, f) $p C O 2$

Fig.7 XRD patterns of P110SS steel after corrosion under 2 kPa $p H 2 S$ and varied $p C O 2$ at 100 ℃ (a) and 220 ℃ (b)

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