열유실층이 있는 오일샌드 저류층에서 eMSAGP공법의 비응축가스 주입시점 분석
Analysis of Non-condensable Gas Injection Timing in eMSAGP Method for Oil Sands Reservoir with Thief Zone
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초록
본 연구에서는 eMSAGP(enhanced modified steam and gas push)공법의 NCG(non-condensable gas) 주입시점을 열유실문제 발생 전·후로 나누어 선정하였다. NCG는 스팀챔버 형태를 유지하여 열유실문제를 개선하면서도 스팀챔버 성장을 방해해 누적오일생산량을 감소시킨다. 따라서, 어떤 생산성능을 우선순위에 두는지에 따라 적합한 NCG 주입시점을 선정하는 것이 eMSAGP공법의 핵심이다. 본 연구에서는 주입시점을 SAGD(steam-assisted gravity drainage)공법과 SAGP공법의cSOR(cumulative steam-oil ratio) 차함수의 기울기를 기준으로 결정하였다. 연구 결과, 열유실문제발생 전 NCG 주입은 SAGP공법 대비 cSOR을 1.85% 감소시켜 열유실문제 관점에서 효과적이다. 반면, 발생 후 NCG 주입은 SAGP공법 대비 누적오일생산량을 36%(SAGD 대비 1.7%만 감소) 증가시켜 누적오일생산량 관점에서 효과적이다.
Abstract
In this study, the injection time of non-condensable gas (NCG) in the enhanced modified steam and gas push (eMSAGP) method is tested before and after heat loss occurs. Although NCG helps maintain the shape of the steam chamber mitigating heat loss, it hinders the growth of the steam chamber reducing cumulative oil production. Therefore, determining the NCG timing is crucial in the eMSAGP method. In this study, the injection time is determined based on changes in the gradient of the cumulative steam-oil ratio (cSOR) between steam-assisted gravity drainage and steam and gas push (SAGP). NCG injection before heat loss occurs is beneficial to the cSOR, as it reduces the cSOR by 1.85% compared with the case of SAGP. By contrast, NCG injection after heat loss occurs is effective in enhancing the cumulative oil production, as it increases the cumulative oil production by 36% compared with the case of SAGP.
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