CO2 지하저장과 연계한 원유회수증진 기술
Enhanced Oil Recovery (EOR) Technology Coupled with Underground Carbon Dioxide Sequestration
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초록
본 고에서는 CO2 지중저장과 연계한 원유회수증진 기술을 소개하였다. 원유회수증진을 목적으로 CO2를저류층 내에 주입하는 CO2 EOR 기술은 장기적인 관점에서 CO2를 지하 심부 암반에 저장하는 CCS 기술로전환할 수 있다. CCS와 연계한 CO2 EOR 기술은 EOR에 필요한 대규모 CO2 공급원을 확보할 수 있는 장점이있으며 원유 회수율 증진에 따른 편익 발생으로 CCS를 위한 일련의 프로세스 중, 특히 포집 분야에 경제성을부가할 수 있는 장점이 있다. 이러한 CCS와 연계한 CO2 EOR 기술의 특징 및 시장 전망을 살펴보고 국외의대표사례로 Weyburn CO2 EOR 프로젝트를 소개하였다. 또한, 안정적이고 경제적인 CO2 EOR 실시에 필요한제반 기술 요소를 분석하고 CO2 주입중 및 주입후 장기운영과정에서의 미소진동 계측, CO2의 최소혼화압력및 최대주입압력의 사전설계 등의 암반공학적 쟁점들을 소개하였다.
Abstract
Enhanced oil recovery (EOR) technology coupled with underground carbon dioxide sequestration is introduced. CO2 can be injected into an oil reservoir in order to enhance oil production rate and CO2 EOR can be turned into CCS in a long term sense. Coupling CO2 EOR with CCS may secure a large scale and consistent CO2 source for EOR, and the CO2 EOR can bring an additional economic benefit for CCS, since the benefit from enhanced oil production by CO2 EOR will compensate costs for CCS implementation. In this paper, we introduced the characteristics of CO2 EOR technology and its market prospect, and reviewed the Weyburn CO2 EOR project which is the first large-scale CO2 EOR case utilizing an anthropogenic CO2 source. We also introduced geotechnical elements for a successful and economical implementation of CO2 EOR with CCS and they were a miscroseismic monitoring during and after injection of CO2, and determination of minimum miscible pressure (MMP) and maximum injection pressure (MIP) of CO2.
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