Schlumberger

Technical Paper: Optimization of Riser Design and Drill Centers With a Coupled Reservoir and Facility Network Model for Deepwater Agbami

Society: SPE
Paper Number: 90976
Presentation Date: 2004
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Abstract

The utilization of multiple wells connected at a subsea manifold provides the opportunity to reduce the number of risers and to reduce capital expense. The problem is the proper modeling of the reservoir well flow coupled with the combined flow into the facility network (manifolds, flowlines and risers), which is necessary to prevent under design resulting in flow rate bottlenecks or over design resulting in extra expenditures. This paper presents a tool and methodology for better modeling of the well to riser flow and the optimization of riser count and configuration.

Although reservoir models coupled with facility networks is not new, software enhancements provided the capability of including operation logic that could duplicate operations in the field. The reservoir model coupled with the facility network provided more reasonable and accurate modeling of multiphase rates and pressures as wells were combined into a single riser.

To optimize the riser count, operation logic was applied to maximize rate in the riser at all times against the erosional velocity limit. This in turn prevented over designing by placing more risers than needed to obtain the field facility capacities. The utilization of the coupled model and operation logic allowed the optimization of the riser count for any particular reservoir model. The optimum riser count was then determined for 3 earth (geologic) models.

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