The model complexity may vary from a simple straight pipeline to highly looped networks. This workspace also allows users to run their analysis in steady state (e.g. field development planning, network debottlenecking, flow assurance analysis, etc.) as well as in transient conditions (liquid loading, pigging scheduling, slugging, etc.).
The Pipe workspace relies on the state-of-the-art thermodynamics which allows users to apply the same fluid characterization, and physical properties and phase equilibria throughout the reservoir, gathering system, processing, refining, to final products and by-products. This provides a more consistent modeling including the ability to track all the components from end-to-end.
Well performance can be modeled using the Deliverability option available in the Source and the Stream - it allows you to input a relationship between well flowing pressure and well production rate.
The Symmetry platform contains a wide variety of fluid characterization methods for systems ranging from heavy oil to associated liquids produced with gas. Simulations may use a consistent slate of components regardless of the number of different fluids when using PIONA based characterizations. These types of fluids track the molecular structure of the different sources thus allowing for consistent property estimation when material is blended.
The data required to define a fluid may be as detailed as an extended Cn analysis combined with other information such as viscosity or density data. There are also options to characterize fluids with a reduced set of properties such as specific gravity, gas oil ratio and water cut.
The Symmetry platform has a consistent property package and fluid characterization that can be used throughout the simulator in all of the workspaces with the steady state and dynamic engines and as well as a tailored workspace that can be used when required.
The Pipe workspace has all of the most widely used model flow models in the industry. It covers the most traditional empirical methods (Beggs and Brill, Lockhart & Martinelli) to the more generalized multi-fluid mechanistic models currently available (Petalas, Oliemans, etc.). Users can also access the most typical third-party flow models such as OLGAS and LedaFlow.
Pipe network models can be run in steady state and dynamics. It takes a few clicks to switch a steady state model into dynamics and vice versa. This powerful feature allows engineers to perform two analysis's using the same model. In fact, in case of a network with a long stabilization time the use of the steady state solver in conjunction with the dynamic can quickly reach steady state conditions.
Transient analyses in the Symmetry platform can have an augmented scope compared with the common practice. For instance, engineers can study the effect of slugging and pigging not only in the inlet separator but also all the downstream unit operations. Launched pigs, and their induce slug, can be tracked at any point of the network. Users may take the advantage of the Event Scheduler tool that will allow them to evaluate multiple pigging scenarios that can lead to an optimized pigging schedule that minimizes facility downtimes saving millions of dollars.
The detailed analysis can include the pipe network details, processing units, plant process control schemes, emergency shut-down scenarios, operating procedures such as start-up and scheduled shut-down, etc.
Multiple PIONA characterization consists of a customizable carbon number and molecular structure component grid, where properties are trended per chemical class. Properties for slate components are obtained from extended correlations based on information gathered for the different structure types. Each fluids composition slates is regressed to minimize the error on provided experimental information which be different types of analysis: Distillation Curve, Cn Analysis, Viscosity and Density Curves, Black-Oil properties among others.
This approach allows users to take any input specifications from multiple fluids to be fitted in a unique compositional slate which provides a better estimation of the physical properties, consistent thermodynamics, more accurate estimation of blends, and component tracking all across the board (pore to pipe).
The Oil Sources unit operation is used to characterize reservoir fluids to match the given properties. In general terms, users can create many different Oil Sources as many different fluids are available. A fixed slate of components is used for all the fluid which compostion are regressed to match the analyses.
Well performance can be modeled in the Pipe workspace using the Deliverability option available in the Source and the Stream. It allows users to input a relationship between well flowing pressure and well production rate.
The available options are:
The following unit operation can be solved within a steady state pipe network solver:
This allows users the ability to select flow paths (a set of connected pipes) for results visualization. It can show any variable calculated within the pipes and results can be shown in a plot or tabular fashion. Flow paths can be created, named, and deleted so users can monitor particular network sections. The combination of Flow Path Viewer and the Flow Assurance tool give a lot of flexibility to users for troubleshooting pipe networks.
This tool a key to solving pipe networks. It monitors all of the specs required to solve a model guiding the user to provide input data and boundary specs (P/F), as well as catching over-specifications.