Kostarelos, Konstantinos2019-09-182019-09-18August 2012017-08August 201https://hdl.handle.net/10657/4774CO2 injection is a widely employed and highly successful method for Enhanced Oil Recovery (EOR) onshore USA. Despite the benefits, there are significant challenges to CO2 injection, including corrosion and adverse rock–mineral interactions. Furthermore, CO2 supply is not always easily available, and gas transportation costs may be prohibitive especially for marginal assets. The shale boom has flooded the market with natural gas, with an accompanying drop in gas prices. The relative abundance of hydrocarbon gas warrants investigation into the viability of using this gas as a CO2 substitute. Coreflooding and slimtube experiments were carried out to compare the effectiveness of supercritical hydrocarbon gas and CO2 injection for enhanced oil recovery. These experiments were used to calibrate a numerical simulation model. Different blends of hydrocarbon gasses were assessed as EOR injectants resulting in the proposal of a gas mixture with displacement efficiencies comparable to CO2.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).EORCO22019-09-18Thesisborn digital