다상 유동 시 해저 유동관 내벽 코팅에 따른 왁스 집적 분석 실험 연구
Experimental Study on Wax Deposition Depending on Internal Coating of Subsea Flowline in Multi-phase Flow
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초록
해저 석유생산 시 유동안정성 확보를 위한 왁스 집적 제어기술 중 내벽 코팅법은 생산 환경에 적합하게설계하여 적용할 경우 석유 생산을 중단하지 않고 효과적으로 왁스 집적 제어가 가능하다. 석유 생산이 진행될수록 물 생산량이 증가하게 되며, 단면적이 좁은 구간을 통과할 때 물과 오일이 혼합된 에멀젼이 빈번히 생긴다. 따라서 이 연구에서는 현장오일을 이용하여 단상(오일) 및 에멀젼이 생성된 다상(물-오일) 유동조건에서 에폭시, 폴리우레탄, PTFE, DLC, 실리카, 산화타이타늄 코팅이 왁스 집적에 미치는 영향을 고형물생성유도장치를 이용하여 실험적으로 분석하였다. 연구 결과 코팅의 거칠기, 친유성 정도보다 단상 조건에서는 단열성능, 다상 조건에서는 친수성 정도가 왁스 집적 감소에 주요하게 영향을 미치는 요소로 나타났다.
Abstract
Internal coating, which is one of flow assurance technologies in subsea oil production system, can control the wax deposition without interrupting oil production if appropriately designed coating is installed. Water cut is increased during producing the oil, then emulsion frequently occurs by mixing the water and oil if mixed production fluid passes through a narrow section. In this study, the effects of various internal coating materials (epoxy, polyurethane, PTFE, DLC, silica and titanium dioxide) on wax deposition were analyzed in single-phase (oil) and multi-phase (water-oil) flow with emulsion condition using cold finger apparatus and crude oil. As a result, heat insulating performance in single-phase and hydrophilicity in multi-phase affected amount of the wax deposits more than roughness and olephilicity of coating properties.
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