The Amal Petro Company (AMAPETCO) planned to optimize its network flow
to overcome a number of issues that were preventing it from producing its
reservoirs to full potential. Its existing capacity was challenged by varied
reservoir pressures, while flow assurance was often compromised by hydrate,
slug, erosion, and bottleneck problems. AMPAPETCO wanted to define an ideal
network and facility design, and isolate associated flow assurance issues.
AMAPETCO discussed the creation of a new network model with Schlumberger
to help in this process. It needed to include all wells, risers, subsea
pipelines, and elbows, as well as reflect the subsea
environment—accounting for temperature gradients and water
Building the model
The first task was to gather data from all areas of the network,
including flowlines and riser properties, PVT data, and observed and wells
data. This information was then used to create a comprehensive network model in
the PIPESIM steady state multiphase simulator. History matching was then
undertaken, and applicable horizontal and vertical flow correlations were
evaluated. The best combinations were then selected to show the smallest
difference between simulated and actual pressure measurements at the surface.
The model was then fine tuned by adjusting holdup and friction factors to
improve match accuracy. Flow correlation was validated at different time
To test various flow situations, simulation scenarios were then run.
Just-gas, just-oil, and gas-and-oil flow scenarios were simulated with a number
of different flow assurance simulation variations, including hydrates, slugs,
erosion, and bottlenecks.