Case Study: Statoil achieves a defined subsea tieback operating envelope with SLB's OLGA simulator and RMO workflow

Combined Solution Methodology Aids Statoil with Subsea Tieback Design

Statoil worked with SLB to evaluate the feasibility of a deepwater subsea tieback for a gas-condensate field offshore Tanzania. The company needed to quantify flow assurance uncertainties for a long-distance pipeline in 2,600-meter water depth and understand how seabed profile, liquid holdup, and other operating variables could affect the design. SLB’s OLGA dynamic multiphase flow simulator was used for the study.

SLB combined OLGA with its risk management and optimization workflow to run sensitivity studies, probability-based uncertainty analysis, and thousands of simulations across key operating conditions. The approach helped Statoil identify the main risk parameters, bracket liquid accumulation and inlet pressure behavior, and define the operating envelope for the field. As a result, Statoil improved confidence in concept selection and tieback design by using a more systematic, automated method to assess flow assurance risk.

Statoil