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International Conference on Innovative Applied Energy    

E-Proceedings ISBN: 978-1-912532-05-6

St Cross College, University of Oxford, United Kingdom



Cement Sheath Integrity Evaluation for CO2 Storage in Salt Rock Caverns and Design Specification of Salt Rock Cavern for CCS Application



Okhiria Udebhulu (1), Alvaro Costa (1), Pedro V. M. Costa (2) and Ricardo Azevedo (1)

1. Departmento de Engenharia de Minas e de Petroleo Universidade de Sao Paulo, Sao Paulo, Brasil

2. Modecom-Technology in Geomechanics and Computing Modeling Avenida das Americas, Rio Janeiro, Brasil


Paper Abstract

Carbon Capture and Storage (CCS) in geological media has been identified as a viable climate change mitigation technology, while wellbore integrity has been identified in many studies as a key risk factor in the viability of geologic CCS project. Wellbore integrity is highly dependent upon the integrity of the interfacial bonding of the cement to the formation and the casing. Very little is known about how well, hydrocarbon wells withstand carbon dioxide environment, especially in deepwater offshore environment. Salt caverns has been identified as one of the best medium for underground storage of gases due to salt rock’s excellent sealing capabilities and interesting mechanical properties like self-healing when damaged or cracked. Salt caverns are formed through a leaching process which involves the pumping of fresh or sea water at regulated pressure to dissolve the rock salt and remove the resulting brine via a single well which serves for both injection and withdrawal.
The geomechanical study of an offshore ultra-deep water giant salt cavern, 450m high by 150m in diameter, reveals the safe storage of 4 billion Sm3 or 7.2 million tons of CO2. Also based on computational mechanics, a smaller pilot-size experimental cavern would be constructed to obtain valuable field parameters required before the construction of the giant cavern. The experimental cavern will provide a basis for validating the structural integrity measurements of salt caverns in general for CCS application.
In this article, an extensive literature review to establish the mechanisms of different failure modes in cement sheath integrity during various CCS scenarios and the reaction of CO2 and supercritical CO2 with some typical salt rocks and reservoir rocks at several possible reservoir conditions would be provided to establish the state-of-art. The design of the experimental cavern and the well design to construct and operate this small cavern is also presented.

Paper Keywords
CCS, Wellbore Integrity, Supercritical CO2, Cement Sheath Integrity, Geomechanical Study, Salt Rock Caverns and Solution Mining.
Corresponding author Biography

Okhiria Dickson Udebhulu is an Assistant-Lecturer at Alex Ekwueme Federal University Ndufu-Alike, Ikwo (AE-FUNAI), Nigeria. He holds a Bachelor of Engineering degree in Chemical Engineering with a first class honors from Ahmadu Bello University, Zaria, Nigeria and a Master of Science degree in Petroleum Engineering from African University of Science and Technology, Abuja, Nigeria. He is currently on a Study Fellowship sponsored by the Petroleum Technology Development Fund (PTDF), Nigeria to support his Doctorate program in Mineral Engineering at the Universidade of Sao Paulo (USP) – SP, Brazil. Mr. Udebhulu is a recipient of several academic honors and other special awards, notable amongst the awards include, PTDF Oversea Scholarship Scheme (OSS) to support his PhD in Mineral Engineering at USP, Brazil (2016/2017); Best Poster Award for outstanding MSc. Poster presentation in the Petroleum Engineering Symposium (PES) at the 1st Annual African University of Science and Technology International Conference on Technology, Abuja, Nigeria (2015); African University of Science and Technology- African Development Bank (AUST-AfDB) Scholarship in view of his impressive performance at the entrance examination to support his MSc. in Petroleum Engineering at AUST, Abuja (2013/2014); Best Final Year Research and Design Project in Chemical Engineering, ABU, Zaria (2011/2012) and PTDF Local Scholarship Scheme (LSS) to support his BEng. in Chemical Engineering at ABU, Zaria (2008-2012) among others.
Mr Udebhulu is actively involved in research, he has authored and co-authored several articles in high-impact indexed journals. His research interest include: Carbon Capture and Storage (CCS) in geological media especially in Salt Caverns; Wellbore Integrity Management in Deepwater, Management of Sand Production in Oil and Gas Wells, Reservoir Engineering and Flow Assurance. Mr Udebhulu is a member of Society of Petroleum Engineers (SPE) USP-Brazil Chapter, member of Nigeria Society of Engineers (NSE), member of Nigeria Society of Chemical Engineers (NSChE) and a member of Nigeria Association for Energy Economics (NAEE)

The International Conference on Innovative Applied Energy (IAPE’18)