Carbon Capture and Storage (Ccs) Practices in the Enping Field, South China Sea

20 Pages Posted: 7 Feb 2024

See all articles by Qi Zhang

Qi Zhang

affiliation not provided to SSRN

Changyou Xia

UK-China (Guangdong) CCUS Centre

Na Rao

UK-China (Guangdong) CCUS Centre

Xi Liang

University College London

Abstract

The Enping CCS project is a pioneering effort in China to establish an offshore industrial-scale carbon capture and storage initiative. The project began operations in June 2023, and has an annual capacity to store 300,000t CO2. Its design is tailored to address specific challenges presented by the Enping Field, which include high CO2 concentrations, limited platform space, and shallow high-angle directional drilling. Notably, the Enping Project distinguishes itself from other offshore CCS projects worldwide, including those like Sleipner, Snøhvit, and Gorgon projects. This paper provides an overview of the CCS practices implemented in the Enping Field. The associated gas produced from the Enping Field, containing 84% to 94% CO2, is considered suitable for direct sequestration in saline aquifers. The CO2-rich gas undergoes dehydration via the molecular sieve method, followed by a three-stage compression process, reaching 11 MPa before injection. The injection process utilizes a shallow, low-angle, directional well, securely storing CO2 in a saline aquifer at depths of 830-920m. The knowledge and experience from the Enping project have reference significance for regions confronting similar challenges in managing high-CO2 natural gases in offshore environments.

Keywords: CCS, offshore carbon storage, South China Sea, Pearl River Mouth Basin

Suggested Citation

Zhang, Qi and Xia, Changyou and Rao, Na and Liang, Xi, Carbon Capture and Storage (Ccs) Practices in the Enping Field, South China Sea. Available at SSRN: https://ssrn.com/abstract=4719103 or http://dx.doi.org/10.2139/ssrn.4719103

Qi Zhang

affiliation not provided to SSRN ( email )

No Address Available

Changyou Xia (Contact Author)

UK-China (Guangdong) CCUS Centre ( email )

1 Tiantaier Rd.
Huangpu
Guangzhou
China

Na Rao

UK-China (Guangdong) CCUS Centre ( email )

1 Tiantaier Rd.
Huangpu
Guangzhou
China

Xi Liang

University College London ( email )

Gower Street
London, WC1E 6BT
United Kingdom

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