Wells Module
Simulates the transient multiphase flow in the well bore. The Wells Module is designed for well flow applications where the reservoir properties and the inflow relationships will play an important role when modelling the scenarios.
The reservoir performance is specified through permeability, extension of the reservoir, fluid properties etc. or from draw-down/build-up tests from the actual well.
Drilling simulation is an option that is available through the Advanced Well Module. The drilling option can be used to simulate the thermal-hydraulics in a drilling operation. The drilling option allows for the possibility of injecting fluid (gas lift for example) through concentric annulus or a parasite pipe. A moving grid system is used to simulate the flow along the drilling string in the annulus during drilling.
The module includes a mud phase that may be used as a 4th phase in simulations. |
Typical cases:
- Start-up-shutdown of production
- Well testing
- Production from different zones
- Reservoir injection, e.g. WAG
- Flow in annulus, gas lift
- Multilateral well simulations
- Simulation of flow during drilling
- Manage pressure drilling profile
- Blowout simulations
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OLGA 7 Three-Phase
OLGA 7 Three-Phase is the main module. It includes the Steady-state and Transient network solvers for three phase flow (water, oil and gas). The solvers calculate the slip (velocity difference) between the phases. In almost all cases, production tubes and pipelines have three phases flowing simultaneously and at low velocities there is considerable slip between the gas and liquids and also between oil and water. As a result, the liquids tend to accumulate in low spots in the system. This leads to high local accumulations of liquids and thereby a potential for slugging and surges. Where water accumulates there is also potential for serious corrosion problems as well as hydrate formation.
Dispersions of oil and water are also predicted and dispersion viscosities, which may deviate considerably from the oil-water average viscosities, are either calculated by the default models or according to user given tuning factors.
Modelling of basic process equipment is included. OLGA Server interface allows for connecting with other simulators. |
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Slugtracking Module
With extended reach wells there is increased risk for hydrodynamic slugging The Slugtracking Module has
a unique feature of tracking each individual slug from its formation to either its exit from the well or its extinction.
The model considers the mechanisms of slug formation, merging of slugs, growth and decay of slugs. The Slugtracking Module has considerable value in the design of production facilities. It is designed to determine whether downstream equipment (such as separators and compressors) will be capable of processing the slugs properly. The mechanisms of slugging that are included are; Hydrodynamic, Terrain and Start-up rate changed induced. |
Typical cases:
- Control strategies and system design
- Operational procedures/guidelines
- Operational trouble shooting
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Compositional Tracking Module
The Compositional Tracking Module allows dynamic change in fluid composition and tracking of individual components along in the wells. In basic OLGA® the chemical compositions are defined as constant throughout a simulation. In reality, the composition may vary along the well due to slip effects (velocity differences between phases), interfacial mass transfer, merging lateral wells as well as gas for gaslift with different fluids and changes in fluid composition at the inlet. In the compositional model mass equations are solved for each component in the gas phase, droplets, bulk of the oil and water phases. Thus, the compositional model will keep track of the changes in composition in time and space, and ensure a more correct fluid description compared to the basic OLGA® model. |
Typical cases:
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Multilaterals with different fluids
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Shut-in and start-up scenarios
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Gas injection and gas lift
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Changes in composition at inlets and in sources
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Tracking of gas quality
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Safety analysis |
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Rocx Module
- Improve predictions of well shut-in and start-up
- Enhance flow instability predictions
- Explain gas- and water coning in the near-wellbore area
- Understand well cycling for liquid-loaded gas wells
- Map transient phase behaviour in the near-wellbore region
- Optimise near-wellbore chemical placement procedures
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OLGA for Wells paper list
Here you can find a list of published papers from 1990 to 2011.
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