천이 관내 다상유동 모델을 활용한 해양 천연가스 생산시스템의 정두·공저압 추정
Estimation of Wellhead and Bottomhole Pressures in Offshore Natural Gas Production System Using Transient Multiphase Pipe Flow Model
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초록
이 연구에서는 정두·공저압력계측이 불가능한 해양 천연가스 생산시스템을 대상으로 천이 관내 다상유동모델을 구축하여 정두·공저압력을 추정하였다. 현장자료와 검증된 모델을 통해 운영조건 변화에 대해 효과적으로 가스 및 정두·공저압의 변화를 추정할 수 있었다. 또한 생산감퇴곡선분석법으로 향후 가스생산량을 예측한 후 구축한모델을 이용하여 가스생산에 따른 정두·공저압력 변화를 추정하였다. 이 연구결과를 공저압력 계측장비가 설치되지않았거나 정상 작동하지 않는 다른 천연가스 생산시스템에 적용한다면 효과적으로 활용할 수 있을 것으로 사료된다.
Abstract
This study proposes a transient multiphase pipe flow model to estimate the wellhead and bottomhole pressures of an offshore natural gas production well. The transient multiphase pipe flow model is designed for an offshore natural gas production system, in which both the wellhead and downhole pressure gauges have failed. The results demonstrate that the model can estimate the gas rate and flowing pressure at different operating conditions, with reasonable accuracy. Finally, the production forecast obtained from the decline curve analysis is applied to the model to estimate the flowing pressure profile in the future.
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