CO2-WAG 공법의 설계변수 분석 및 오일회수율 평가
Analysis on the Design Parameters and Evaluation of the Oil Recovery in CO2-WAG Process
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초록
CO2-WAG 공법 적용에 있어, 오일회수율을 높이기 위해서는 주요 설계변수에 대한 최적설계가 필요하다. 본 연구에서는 CO2-WAG 공법에서 각 설계변수가 오일회수에 미치는 영향을 분석하고자, 1-D 모델을 구축하여 주입속도 및 WAG 비율과 CO2 슬러그 사이즈에 대한 변수 분석을 수행하였다. 그 결과, 오일회수율은1:2 WAG 비율과 0.04 PV CO2 슬러그 사이즈에서 가장 높게 나타났으며, 누적 CO2 슬러그 사이즈는 0.5 PV가적절함을 확인하였다. 또한, 분석 결과를 기반으로 설계된 저류층 모델을 활용하여 CO2-WAG 공법의 회수증진효과를 확인하였다. 1차 회수에 비해 20%, 수공법에 비해 7% 더 높은 오일회수율을 보였으며, CO2-WAG 주입기간 동안 증진된 오일은 약 21 MMbbl로 8%의 오일회수율 증가를 보여 경제적 파급효과가 충분한 것으로 나타났다.
Abstract
In applying CO2-WAG, the optimization of design parameters is a main concern to obtain favorable oil recovery. In this study, a parametric study was implemented to investigate the effect of injection rate, WAG ratio and CO2 slug size on oil recovery. A 1-D model was developed to confirm the oil recovery factor for different design parameters. As a result, the optimum parameters for CO2-WAG were WAG ratio of 1:2, slug size of 0.04 PV and total slug size of 0.5 PV. Based on the analysis, reservoir simulations were carried out to investigate the effect of enhanced oil recovery. It was confirmed that CO2-WAG results in incremental 20% and 7% oil recovery compared to the primary recovery and water flooding, respectively. As oil recovery was increased to 8% with the increased oil of 21 MMbbl during injection period of CO2-WAG, the application of CO2-WAG process is economically feasible.
참고문헌 (12)
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