Study of the impact of injection parameters on the performance of miscible sour gas injection for enhanced oil recovery

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.

Prospects of an Acid Gas Re-Injection Process into a Mature Reservoir

“…The results demonstrated a distinct pattern of reservoir response to acid gas injection, showing an increase in reservoir pressure and, thus, in oil production over time. These findings align with previous simulation studies that have highlighted the efficiency of acid gas injection in improving recovery rates in sour reservoirs [45][46][47], as well as with past field experience, such as the Zama field in Canada [48], the Tengiz oilfield in Kazakhstan [28,49] and the ARF and GAF fields located in the Gulf Arab region [28], endorsing the fact that acid gas re-injection can serve as an effective EOR technique.…”

A Surface Charge Approach to Investigating the Influence of Oil Contacting Clay Minerals on Wettability Alteration

“…Different well operations, which include drilling, acidizing, and enhanced oil recovery techniques, are implemented in the life of a field or reservoir. These well operations begin with the drilling operation and end with EOR operations, which alters the nature of the fluids and rocks in the reservoir. , These operations induce a change in the pH environment of the reservoir, which affects the surface chemistry of contacting minerals. The aftereffect of these well operations includes the adsorption of polar crude oil compounds on the rock surfaces, which has a significant impact on production.…”

Highly stable Fe/CeO2 catalyst for the reverse water gas shift reaction in the presence of H2S

“…In many cases, most of the recovered CO 2 and H 2 S is buried in landlls. 11,12 This has necessitated the exploration of new strategies for the active use of C and S-containing substances (CO 2 and H 2 S) to address the critical issues of global climate change and sustainability. H 2 S, one of the sour gas components, is known to cause catalytic deactivation; hence, its academic value and economic benets are expected to be signicant if S-resistant catalysts can be used to directly convert the CO 2 in sour natural gas into value-added products.…”