아사바스카 오일샌드 저류층에서의 toe-up SAGD 예열단계 최적화 연구
Optimization of Toe-up SAGD Preheating in the Athabasca Oil Sands Reservoir
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초록
연속하는 셰일층이 존재하는 오일샌드 저류층에선, SAGD(steam-assisted gravity drainage) 공법의 성능을 향상시키기 위해 유정 쌍(well-pair)을 셰일층 상부에 위치시킨다. 이는 생산구간의 감소로 이어지므로, 셰일층의 영향을 회피하면서 생산구간을 확보할 수 있는 유정 쌍이 필요하다. 본연구에서는 생산정의 toe가 셰일층 상부에 부분적으로 위치하는 새로운 유정 쌍인 toe-up SAGD 공법을 제안한다. 이를 위해 다양한 예열 운영 방법과 인자들에 대한 민감도 분석을 수행하여 최적의 예열 운영 조건을 도출한다. 또한, 생산성 지표 및 NPV를 비교하여 일반적인 SAGD 공법 대비toe-up SAGD 공법의 성능 증진 효과를 확인한다. 마지막으로, 실제 현장 저류층 물성을 반영한 불균질 모델에 toe-up SAGD 공법을 적용하여 기술의 실현 가능성을 평가한다.
Abstract
In the oil sands reservoir with continuous shale layers, steam-assisted gravity drainage (SAGD) well-pairs are located above the shale layers to improve performance. This may lead to a decrease in the net-pay zones, necessitating a well-pair that can secure these zones while avoiding the influence of shale layers. This study proposes a new well-pair design called toe-up SAGD, in which the toe of the producer is partially located above the shale layer. Sensitivity analyses of various preheating methods and parameters were conducted to derive the optimal preheating operating conditions. Furthermore, performance enhancements of toe-up SAGD were confirmed by comparing the productivity indicators and NPV with those of conventional SAGD. Finally, a feasibility study was evaluated by applying the toe-up SAGD to a heterogeneous model considering the reservoir property of the real field.
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