_____________________________________________________________________________________________________ *Corresponding author: E-mail: evans_okoro@uniport.edu.ng; Journal of Energy Research and Reviews 8(4): 21-38, 2021; Article no.JENRR.73988 ISSN: 2581-8368 Recovery of Nigerian Heavy Oil: Application of Steam Flooding Okoro Emmanuel Evans 1* , Mike Onyekonwu 1 and Joseph Ajienka 1 1 Emerald Energy Institute, University of Port Harcourt, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JENRR/2021/v8i430218 Editor(s): (1) Dr. Davide Astiaso Garcia, Sapienza University of Rome, Italy. Reviewers: (1) Sampath Kumar Venkatachary, Amity University, India. (2) Kennis Rozana, Universitas Negeri Malang, Indonesia. Complete Peer review History: https://www.sdiarticle4.com/review-history/73988 Received 14 July 2021 Accepted 24 September 2021 Published 29 September 2021 ABSTRACT Aims: Nigeria has a lot of conventional and heavy oil resources. Although much of the conventional oil resources have been developed since independence, the heavy oil resources have remained underdeveloped due to low recovery based on primary production and consequently doubts about economic viability based on the current fiscal regime. This paper examines the application of Steam Flooding enhanced oil recovery (EOR) method to suitable Nigerian heavy oil reservoirs, seeks to develop a diagnostic model to predict the performance, evaluates the economics to determine the viability of the EOR method. The development of heavy oil will increase Nigeria’s oil reserves and production. Study Design: Data was collected for two heavy oil reservoirs from two oil companies in Nigeria following a Non-disclosure Agreement (NDA). Place and Duration of Study: Emerald Energy Institute, University of Port Harcourt Nigeria, 2016 - 2021. Methodology: The screening criteria of commercially effective EOR methods were applied to select steam flooding for the studied reservoirs. Design of Experiment (DoE) was used to evaluate the reservoirs and operating parameters and to determine their optimum values, which were then used to predict the performance of the reservoirs. The economics of the steam flood technique endorsed for the reservoirs considered were also evaluated using Discounted Cash Flow Analysis (DCFA). Results: These assessments confirmed that steam flooding technique was technically and economically viable for the heavy oil reservoirs considered. The steam flood was observed to have Original Research Article