Abstract
The Water Alternating Gas (WAG) process is a cyclic process of injecting alternating water followed by gas. The main purpose of WAG injection is to improve both macroscopic and microscopic sweep efficiency, maintaining nearly initial high pressure, slow down the gas breakthrough and reduced oil viscosity. WAG injection also decreases the residual oil saturation resulted from the flow of three phases and effects associated with relative permeability hysteresis. The study area is in the Cornea Field located in Browse Basin, Western Australia. This study is conducted because there is no investigation on WAG injection feasibility in this field. In this study, two-phase bounding imbibition and drainage relative permeability model (Stone 1 and Stone 2) along with two-phase hysteresis model (Land, Carlson or Killough) were used. From the result, Carlson two-phase hysteresis model with Stone 1 correlation shows more oil was recovered. Therefore, it is a feasible model to be used compared with other models. From sensitivity analysis, it shows that highest oil was recovered at WAG ratio 1:1. Since it is a miscible reservoir, 1:1 ratio is more efficient and it is insensitive to trapping. Also, oil production increased with the shortest WAG cycle time at 180 days due to minimum miscibility pressure reached. In addition, it is best to inject water as the first phase to be injected into the reservoir compared to CO2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$_{2}$$\\end{document} because water has high mobility ratio while CO2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$_{2}$$\\end{document} can result in early breakthrough in the reservoir.
Highlights
The Water Alternating Gas (WAG) process is a cyclic process of injecting alternating gas followed by water and repeating this process for number of cycles
Journal of Petroleum Exploration and Production (2021) 11:1475–1485 down the gas breakthrough, viscosity reduction caused by the gas dissolution in oil, fluid composition variation and decrease the residual oil saturation resulted from the flow of three phases and effects associated with relative permeability hysteresis (Hussien 2013).WAG injection involves drainage (D) and imbibition (I) taking place simultaneously or in cyclic alternation in the reservoir (Fabusuyi 2013)
It shows that Carlson two-phase hysteresis model with Stone 1 interpolation model was more feasible and recovered more oil production
Summary
The Water Alternating Gas (WAG) process is a cyclic process of injecting alternating gas followed by water and repeating this process for number of cycles. The main purpose of WAG injection is to improve oil production recovery, which help to improve both macroscopic and microscopic sweep efficiency, maintaining reservoir pressure, slow. By using WAG injection, attic oil in the upper part of the reservoir may be contacted by the injected gas and water flood will push the miscible slug. This will increase the microscopic efficiency because the unswept reservoir area will be smaller. Supplies of biodiesel appear to have outstripped demand in many countries but not a realistic solution of today’s world demand (Hemisphere 2008)
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