The Effect of Different Gas Water Ratio on Recovery Factor and CO2 Storage Capacity in Water Alternating Gas Injection. A Case Study: “V” Field Development, North Sea

Abstract

CO₂ injection is one of the Enhanced Oil Recovery (EOR) methods. In this study Water alternating gas (WAG) CO₂ injection method was used to obain the maximum sweep efficiency. The purpose of this study was to analyze the effect of gas water ratio (GWR) value on recovery and CO₂ storage capacity, and to analyze the best scenario in term of technical objective.

This study was carried out using E300 reservoir simulator. The increase in recovery and CO₂ storage were observed throught the parameters of recovery factor and CO₂ storage capacity, while the determination of the best scenario in term of technical objective was observed using the parameters of objective function. This study was carried out in 3 different scenarios, which were the injection of 100% CO₂, 60% CO₂and 40% water, and 40% CO₂ and 60% water

Based on the observation, it was founded that third scenario with the GWR of 40:60 resulted the highest cumulative production and recovery factor with the value reaching 14.1 milliom m³ and 67.4%. Meanwhile the second scenario with the GWR of 60:40 has the highest CO₂ storage capacity of 3 billion Sm³ CO₂. The second scenario has the best performance in term of technical objective with the value of objective function reaching 0.45.