해양 가스 생산시스템의 유동안정성 확보 연구

Abstract

Flow assurance management in natural gas production system of matured offshore field is essential since gas lifting is not enough for flow assurance due to decreased reservoir pressure. It may cause gas well shut down if gas flow rate is less than critical gas velocity in subsea system such as production tubing, flowline, riser and topside in offshore platform. This phenomenon also may cause liquid loading & hydrate plug at low temperature & high pressure in subsea production system. This study suggests three methods of offshore natural gas production system flow model and hydrate plug models in order to investigate liquid loading and hydrate depressurization analysis. The liquid loading simulation results figured out liquid loading indicate at the riser 4.4 mmscf/d of gas rate and 95 m of liquid column from riser start point. Hydrate plug result figured out 1,000 m position and 530 m length from x-mas tree. Depressurization result figured out 280 hours of two-side depressurization is best method to remove hydrate plug safely.