OLGA Specialist Engineering Modules

OLGA consists of a number of modules separately prices and delivered.

Hydrate Kinetics Module A tool for prediction of onset of solid hydrate and their formation rate. In many hydrocarbon production operations, gas hydrates cause major, and potentially hazardous flow assurance problems. A typical area of concern is multiphase transport lines from well-head to the production facility where low seabed temperatures and high operation pressures increase the risk of blockage due to gas hydrate formation. Different methods are currently in use for reducing hydrate problems in hydrocarbon well stream transport and process facilities. OLGA® predicts the risk of hydrate formation and gives an operating envelope for preventing formation of hydrates.
MEG Tracking Module The MEG Tracking Module makes it possible to track MEG concentration and distribution along the pipeline, and to determine the total MEG inventory in the pipeline system. A common method of hydrate prevention in production pipelines is continuous MEG (glycol) injection. Since the MEG requirements are relatively large, the MEG is separated from the water phase in a regeneration plant and recycled. A separate pipeline brings the MEG back to the pipeline inlet. The MEG content in the pipeline will vary with the total production rate, and especially at low production rates large quantities of water and MEG can accumulate in the pipeline. Since the MEG circulates in a closed loop it is important to keep track of the total MEG inventory, so that there are always sufficient amounts of MEG available to inhibit the production. An additional functionality in the MEG module is an adjustment of the hydrate curve, taking into consideration the local pressure, temperature and MEG concentration. This feature makes it easy to determine if sufficient MEG is injected to prevent hydrate formation.	Typical cases: MEG concentration in the aqueous phase MeOH concentration in the aqueous and gas phase. Inhibitor inventory Inhibitor distribution along the pipeline and arrival time at plant.
Complex Fluid Module A unique tool that can disclose severe effects on flow stability, liquid inventory and pressure drop due to Non-Newtonian liquids. Non-Newtonian effects like shear thinning and yield stress may have profound effects in multiphase flow affecting the flow stability of production systems. The effect may give instabilities in multiphase flow such as slugging. Even in horizontal flow, pressure drop may decline with increasing production under certain conditions. In a real pipeline with elevation differences this could combine with gravity based causes of instability (terrain slugging) to increase the range in which oscillations appear. As increased viscosity/consistency moves the flow towards laminar, the slip between gas and liquid increases, depending on the actual rheology. The effect is greater liquid accumulation and higher pressure drop in elevated pipes.	Typical cases: Non-Newtonian liquids behaviour due to Emulsions, Hydrate Slurry and waxy oils Normal production in laminar flow Terrains slugging Shut-down Start-ups
MATLAB Toolbox Module A tool for interactive multiphase flow simulation, presentation, analysis and controller design. The OLGA® - MATLAB Toolbox makes results from OLGA multiphase flow simulations available in MATLAB. The MATLAB Toolbox functions enable the application engineer to interact with OLGA® in MATLAB scripts analyze the results and design controllers for multiphase flow applications. The Simulink Toolbox block library integrates OLGA® as a part of the Simulink simulation environment and enables interactive multiphase flow simulations. The Toolbox interfaces the multiphase fluid flow simulator through the OLGA® Server interface/TCP/IP protocol. This makes it possible to run one or more pipeline simulations on the same computer or on any number of other computers at the same time.	Typical cases: Interactive simulations Post analyses of simulation results Plotting 2D-3D Controller design and evaluation Prototype development
Tuning Module To tune the OLGA flow models against data – online or offline the Tuning Module offers access to a number of model parameters to be adjusted by a multiplication factor. The tuning module could be applied whenever field data or other information justify modifications of important model parameters like interfacial friction factor or wall frictions. Fluid properties like liquid density, which are cumbersome to modify via a fluid properties package are also accessible directly through the tuning module.