수직정 기반의 균질 저류층 모델을 활용한 광구 규모의 SAGD 생산성 평가
Field-scale SAGD Performance Evaluation Utilizing Homogeneous Reservoir Model Based on Vertical Wells
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초록
오일샌드 광구 개발 시 유망지역의 저류층에 대한 SAGD 생산성 평가가 선행되어야 한다. 하지만, 개발 유망지역이 넓은 경우 저류층 시뮬레이션을 통한 생산성 평가 방법은 상당한 시간이 소요된다. 본 연구에서는 광구 내 여러 수직정에서 측정한 저류층 물성 정보를 활용하여 SAGD 생산성 분포도를 작성하고, 경제적으로 운영가능한 SAGD 유정 쌍 개수 예측 및 생산성 평가 방법을 제시하였다. 캐나다 아사바스카 지역에 위치한 오일샌드 광구 X의 28개 수직정에서 수집한 와비스코 저류층 물성 정보를 사용하여 28개의 균질 저류층 모델을 각각 제작하고 SAGD 시뮬레이션을 통해저류층 품질 유형별 최적의 스팀 주입압력을 결정하였다. SAGD 생산성 지표를 각 수직정 위치에할당하여 생산성 분포도를 작성하고 저류층 두께 10 m, 운영이익의 순현재가치가 $3MM 이상인영역에 한해 경제적으로 운영가능한 유정 쌍 개수를 도출하고 생산성을 평가하였다. 그 결과, 비투멘 가격이 $32/bbl일 때 광구 X에서 93개의 SAGD 유정 쌍 운영 시 순현재가치 $542MM, 누적 오일생산량 8,860 103m3, 오일 회수율 30%의 생산성을 보였다.
Abstract
Before developing an oil sands field, it is essential to evaluate the steam-assisted gravity drainage (SAGD) performance in the area. However, reservoir simulation-based performance evaluations in extensive development areas can be time-consuming. This study attempted to predict the economi- cally viable number of SAGD well-pairs and evaluate field-scale performance based on an SAGD performance map. Reservoir modeling and simulation were conducted using Wabiskaw reservoir properties from 28 vertical wells in Field X. Through reservoir simulation, SAGD performance indicators were allocated to each vertical well location to create the performance map. The number of SAGD well-pairs was derived in areas where reservoir thickness was at least 10 m and the net present value (NPV) of the operating profit exceeded $3MM. At a bitumen price of $32/bbl, the performance evaluation results showed that operating 93 SAGD well-pairs resulted in an NPV of $542MM, cumulative oil production of 8,860 10³m³, and a recovery rate of 30% in Field X.
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