Offshore Condensate Stabilization and Exportation
- William Vocke (Audubon Engineering Solutions, LLC) | Daniel Newman (Audubon Engineering Solutions, LLC) | Robert Villio (Audubon Engineering Solutions, LLC) | Charles Cook (Audubon Engineering Solutions, LLC) | Denis Taylor (Audubon Engineering Solutions, LLC)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 04-07 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2015. Offshore Technology Conference
- 6 Health, Safety, Security, Environment and Social Responsibility, 4.1.4 Gas Processing, 4.5.3 Floating Production Systems, 4 Facilities Design, Construction and Operation, 4.1.6 Compressors, Engines and Turbines, 4.5 Offshore Facilities and Subsea Systems, 4.1.1 Process Simulation, 4.2 Pipelines, Flowlines and Risers, 6.1 HSSE & Social Responsibility Management, 4.1.5 Processing Equipment, 4.2 Pipelines, Flowlines and Risers, 5 Reservoir Desciption & Dynamics, 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics, 4.1.9 Tanks and storage systems, 4.1 Processing Systems and Design, 4.5 Offshore Facilities and Subsea Systems, 5.2 Fluid Characterization, 5.2.1 Phase Behavior and PVT Measurements, 6.1.5 Human Resources, Competence and Training
- Stabilization, Condensate, Delta House
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This paper discusses aspects of the process design approach used for the Delta House production facility (Mississippi Canyon 254 "A"). Specifically, the challenges associated with the disposition of NGL's (considering constraints imposed by export pipeline requirements and the desire to maximize liquids sales volumes) are addressed.
Delta House's process system was initially designed assuming a reservoir composition similar to an analogous nearby well. Based on this composition, liquids from compressor scrubbers were to be routed to production separators with lower operating pressures. This philosophy is very common for offshore facilities and caused minimal liquid recycle and a negligible increase in compression requirements.
Subsequent to this initial process design, a well sample phase behavior (PVT) analysis became available. The PVT data was believed to be representative of the majority of the production associated with Delta House. The PVT data indicated that the reservoir had an approximate stock tank gas-to-oil ratio (GOR) of 2100 and 38° API crude oil gravity. These PVT results represented a significant change from the initially assumed composition. Additionally, the reservoir fluid was very rich with condensate, particularly propanes (C3's), butanes (C4's), and pentanes (C5's).
A significant liquid recycle and a drastic increase in compression requirements were observed when the compositional basis of the reservoir was entered into the steady-state process simulator. In addition, meeting the oil pipeline Reid Vapor Pressure (RVP) specification became a significant challenge due to the rich nature of the crude. The current liquid handling philosophy no longer appeared suitable, and various options were quickly investigated and evaluated. The two most practical options were direct injection of the condensate into the gas pipeline and a full crude stabilizer. It was determined that a hybrid (a Condensate Stabilization System) of the two options was the most economical option due to the ability to recombine the stabilized condensate with the crude oil for sales.
This paper addresses the reasons, benefits, and methodology of installing a Condensate Stabilization System on the Delta House Floating Production System (FPS). It also discusses the process equipment that composes the system, the intended operating conditions, as well as the effects of seasonal variables (oil pipeline RVP specification and ambient temperatures).
A Condensate Stabilization System provides a means to optimize facility production and allows for better RVP control. This is achieved by controlling the reboiler temperature which correlates to the amount of light ends that are recycled to the bulk separation train. It also greatly reduces compression and horsepower requirements. Finally, a condensate stabilization system affords operators the ability to achieve greater margins by providing the flexibility to move liquids from the gas processing and sales system to the oil system.
|File Size||349 KB||Number of Pages||9|