The oil & gas industry during the last decade has shown an orientation towards development of deep water fields which intrinsically require high investments along with complex reservoir development and facilities planning. The scope of such developments becomes increasingly challenging when the fields to be developed utilize the "hub" concept where production from various fields flow back to sub-sea manifolds, converging to the base of the riser to finally flow up to a common topside facility. The Integrated Asset Model (IAM) allows to link numerical reservoir models to a facilities model while honoring all constraints along the network. It has been recognized as a useful tool in providing "hub" based profiles with the provision to run multiple sensitivities which are essential during both the design and production monitoring phase.
However the complexity of IAM augments as the number of fields increases, making a time intensive task running of multiple sensitivities. The current work is aimed at providing an alternate approach to modeling such "hub based" IAM by replacing the numerical reservoir model with an analytic material balance model. This pseudo-IAM has been found to be a practical alternative to provide valid approximations and highly useful in running multiple cases in a fraction of the time to feed operating ranges into flow assurance/engineering studies.
Through application on a deep water development that involves multiple fields tied-back to a shared FPSO facilities via a complex mix of stand-alone producers & injectors, production manifolds, gas lift and multiphase boosting system, the main outcomes, comparative analysis, limitations and applicability bounds are presented.
