Abstract
Sour gas reservoirs have faced critics for environmental concerns and hazards, necessitating a novel outlook to how the produced sour gases could be either utilized or carefully disposed. Over the years of research and practice, several methods of sour gas processing and utilization have been developed, from the solid storage of sulfur to reinjecting the sour gas into producing or depleted light oil reservoir for miscible flooding enhanced oil recovery. This paper seeks to investigate the impact of injection parameters on the performance of sour gas injection for enhance oil recovery. In designing a miscible gas flooding project, empirical correlations are used and the key parameter which impacts the phase behavior is identified to be the minimum miscibility pressure (MMP). A compositional simulator was utilized in this research work to study the effect of injection parameters such as minimum miscibility pressure, acid gas concentration, injection pressure and injection rate on the performance of miscible sour gas injection for enhanced oil recovery. The findings showed that methane concentration had a significant impact on the MMP of the process. Additionally, an increase in acid gas concentration decreases the MMP of the process as a result of an increase in gas viscosity, consequently extending the plateau period resulting in late gas breakthrough and increased overall recovery of the process.
Highlights
A major cause for concern in the development of sour gas reservoir is the disposal of the produced gas (Xue et al 2019)
Sour gas injection for enhance oil recovery (EOR) is a viable option that presents a solution to many problems currently in the industry
Base case light oil reservoir model was built using Eclipse 300 which is a compositional simulator, and the performance of sour gas injected was evaluated by varying the composition of acid gas injected in the oil recovery
Summary
A major cause for concern in the development of sour gas reservoir is the disposal of the produced gas (Xue et al 2019). Sour gas injection for enhance oil recovery (EOR) is a viable option that presents a solution to many problems currently in the industry It eliminates current taxation or future liability associated with emission or surface storage of sulfur (Abou-Sayed et al 2004). Journal of Petroleum Exploration and Production Technology (2020) 10:1575–1589 and voidage replacement ability compared to other gases used for miscible injection EOR This increases the amount of recoverable hydrocarbon (Abou-Sayed et al 2004; Al-Hadhrami et al 2007; Battistelli et al 2011; Chugh et al 2006; Metcalfe et al 1973). The reinjection of a rich waste acid gas stream directly into the producing light oil reservoir for the purpose of miscible flooding enhanced oil recovery using numerical simulation was studied putting into consideration the impact of certain injection parameters on the overall performance of the recovery process. Three injection scenarios (Table 6) were considered to evaluate the general trend on how MMP changes with a decrease in C1 composition
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