Pipeline bridge



Transient multi-phase flow modelling

Transient multi-phase flow modelling studies are typically carried out by specialist teams and software in ad-hoc studies if/when there are specific flow assurance aspects that are suspected. GAP Transient extends the production engineering toolkit allowing a seamless integration between state-of-the-art integrated modelling capabilities of the IPM tools and transient multi-phase flow models. Ensuring that the relevant boundary conditions and physics are captured and integrating the knowledge and experience of the specialist, transient modelling studies into the realm of field management, optimisation, forecasting and development that is already carried out every day in the industry standard IPM toolkit.

Flow assurance

 Flow assurance studies centre around the detection of specific phenomena that are a function of the fluid PVT or the pipeline hydraulics (e.g. Terrain induced or hydro-dynamic slugging, liquid loading, wax formation, hydrate formation, etc.). GAP harnesses all the existing functionality from PVTp and PROSPER to detect these phenomena across the entire surface network, and provide information that will address flow assurance challenges over time. GAP Transient extends this functionality into the realm of dynamic multi-phase flow modelling, seamlessly switching between steady-state and transient modelling. This allows the engineer to optimise and forecast using the state-of-the-art integrated modelling capabilities of GAP and then evaluate the dynamic response of any optimisation strategies that are determined or any flow assurance aspects that are predicted.

Transient thermal modelling

Complementarity between the steady-state modelling tools and the transient modelling applications in use today lies in the fact that the timescales that are typically used for the two are different. Transient models work in the order of minutes to a few days, while steady-state models will work with weeks, months and even years. When working in shorter timescales it becomes vital to capture the complex exchange of heat to the surroundings in a more detailed manner. GAP Transient harnesses all the existing functionality from PVTp and PROSPER to model complex fluids as well as the ability to model detailed well and pipeline completions. Complex annuli, insulation, burial and annular fluids can be modelled. Well integrity calculations are also captured, allowing pressurisation of the annulus during well start-up to be captured.

Transient reservoir modelling

 Transient models require accurate boundary conditions to capture the physics and the changes that are happening in the field. GAP Transient models transient multi-phase flow as well as transient reservoir performance. The integration of transient reservoir performance response allows more accurate prediction of early-time behaviour of wells that dominate in the timescales of transient modelling. Well start-up and the impact of changes due to optimisation of the well controls are drastically affected. Unconventional reservoir production, in tight-oil/shale oil & gas plays as well as more complex reservoir performance in heavy oil, or dual-porosity reservoirs all exhibit reservoir behaviours that can create complex boundary conditions for transient multi-phase flow modelling.