Concurrent 7. Oral Presentation for: Transient modelling of water condensation rate for top of line corrosion
Diwu Chen A *A Wood, Level 1, 240 St Georges Terrace, Perth WA 6000, Australia.
The APPEA Journal 63 - https://doi.org/10.1071/AJ22320
Published: 2 June 2023
Abstract
Presented on Tuesday 16 May: Session 7
Top of line corrosion (TOLC) is typically a concern in the first few kilometres of wet gas pipelines where water in the warm gas condenses on the cold pipe walls. With the introduction of a subsea tieback to existing infrastructure, the changing fluid composition and temperature profiles may increase condensation in sections not previously expected to have condensation. Accurate prediction of the water condensation rate (WCR) becomes essential to support reliable corrosion modelling. Transient flow simulation of pipeline operating conditions and detailed heat transfer modelling is required to calculate the WCR. This calculation is complicated because the mass of water condensation is very small compared to the fluid mass in the pipeline, and sensitive to glycol that is often present in the aqueous phase for hydrate management purposes. This paper introduces a method to calculate WCR by using detailed transient modelling of the pipeline operating conditions. The fluid thermal hydraulic behaviour and hydraulic pressure drop in the pipeline are considered in the model. The fluid composition in the pipeline and glycol component in the aqueous phase are calculated by using a PVT software package. A few sensitivity studies will also be presented. The implications of Equation of State (EoS) and transient flow module on WCR calculation will be quantified. The WCR sensitivity results will be analysed based on varying inlet temperatures, glycol concentrations, and pipeline heat transfer coefficients. A WCR calculation method will be recommended for TOLC modelling.
To access the Oral Presentation click the link on the right. To read the full paper click here
Keywords: corrosion, glycol, heat transfer, OLGA, top of line corrosion, transient modelling, water condensation, wet gas pipeline.
Diwu Chen works for Wood as Lead Flow Assurance Engineer. He has been involved in several major oil and gas projects and has 18+ years of experience in flow assurance and relevant project engineering. He is experienced in dynamic integrated modelling and providing flow assurance support from concept to execution stage. |
