Porous storage Operation Simulator (POS) belongs to the Transition Technologies gas product family. POS consists of software components provided by Transition Technologies S.A. and ESK GmbH. The main goal of this application is to enable users to run simulations of porous gas storages based on live measurements acquired from the automation system and to store, analyze, display and export all required results of such simulations. The simulations are performed by the calculation engine provided by ESK GmbH. POS supports business processes related to simulations of behavior of porous structures that must be performed by engineers from the gas storage plant.
Gas Storage Engineers who want to run pre-feasibility studies, to design and test new wells and layers, to check the correctness of the existing porous storage model
Operational Engineers, to support them in daily calculations for meeting potential gas nominations, hydrate formation restrictions, exportable and importable gas volumes, pressures and temperatures distribution etc.
POS is a powerful simulation tool with functionality and applicability proven over a period of more than 9 years on storages in porous media (aquifers and depleted gas/oil fields) in Germany and other countries.
POS can be used as a fast working simulator to obtain results about the behavior of the underground storage itself, as well as in connection with other software tools. POS may be implemented as a component of a complex storage management system.
For every geological type of storage in porous media and for a given gas rate, the development of pressure and temperature at the tubing head of each well and surface plant, can be calculated in advance. Based on a determined value of the pressure at the surface plant, the performance of the storage can be predicted. POS has been developed to calculate pressure drops on the line from the underground storage layer – well bottom – well head for operational purposes.
POS can be used for following general objectives:
- short-time planning of the operational regimes of the underground storage complex
- medium-term forecasting and planning of the marketing of storage capacities
- identification of technological (parametrical) restrictions per each operational mode
- forecasting of the operational behavior of the underground storage (layers and wells) for the purpose of identification of solutions assuring the improvement of storage capacity and efficiency
- analysis of the technological and economic parameters of the complete underground gas storage operation for the cost optimization
- complex storage analysis for observation and optimization of pressure-volume behavior of the storage
users responsible for the modeling of porous structures and having access to all functionalities of the application.
users responsible for the daily usage of POS, running scenarios, viewing and exporting reports. These users have no access to porous structures modeling functionality.
The key features of POS integration with EDS include
- Real-time data monitoring directly from user’s desktop
- Possibility to compare measurements with simulation results
- Possibility to display process diagrams, trends (XY charts), tabular trends and reports
Different ways to access data:
- dedicated client application, the Enterprise Data Server Terminal
- web client, access directly from web browser
- MS Excel plug-in
- Heavily reduced manual re-entering of data in typical office tasks; the Excel plug-in can be used for a rapid development of reports and calculations
- No additional hardware requirement - any office computer (capable of running MS Office) can run the client Terminal or Web application
Measurements collected from the automation system
POS uses following information for precise modeling:
- Date/Time (full hours) - associated data is assumed for the time step ending at this time
- Gas flow rates for each individual well or a group of wells (volume or energy based)
- Well availability information (for each individual well)
- Gas injection temperature (@ each individual wellhead)
- Composition of injected gas for following components: C1-C5+, CO2, N2
Porous Storage Operation Simulator interface
POS client works as a web application accessible via web browser, but it can be also installed on the user’s computer in out of browser mode. That depends on the POS user’s decision.
POS users are also authorized and their activities are logged and reported. The system keeps an audit trail of all activities performed by the application. Access to the system is restricted to those users with appropriate privileges (could be integrated with enterprise Active Directory accounts).
Porous Storage Operation Simulator has following possibilities of data presentation:
- Displaying actual and archival states of the porous model for every hour,
- Displaying trends on charts and tabular views,
- Displaying limits, comparison with results for layers and for wells,
- Generating Excel reports,
- Comparing simulation results for each well and layer with real-time measurements
The integration allows the management of porous structure models, running simulations, configuring input data and browsing the results. POS can be started in prediction mode or in state update mode, so the model of the porous structure can be used for analysis of a current porous structure pool state or for analysis of future gas site state.
POS also gives wide possibilities to monitor the process data, their quality and the quality of connections between the systems responsible for process data flow.
POS is designed to handle data series of any time granularity (for example minute, hour, day, any other). It provides the functionality to view this data in a tabular form and on charts (bars, trends). Additionally any time series can be exported to the CSV file.
Simulation and evaluation of results
The simulation engine which is invoked by POS application in the background is the most important part of the POS solution.
For each time step POS reads one record of data, which is generated using the mentioned above information. For these purposes POS can generate corresponding reports (measurements vs. model results).
The POS application is also able to export the most actual model state (for manual adjustment) and to import it again into the POS database to check the results of the modification with real time measurements.
Execution of simulations:
- Invocation for any historical period of time (recalculation) and for the future (prediction)
- Running simulations without updating the state of model
- Update of porous model’s state to the desired date
- Functional user interface for porous simulations and analysis
- Availability of models status information for better management of multiple models in the system.
As a result of simulation POS displays more than 40 parameters for porous structure pool. Example results are listed below:
- Reservoir pressure, gas in place
- Bottom hole and wellhead pressures
- Manifold pressures
- Well water production rate
- Gas temperature, gas water content & hydrate formation temperature at wellhead
- Gas flow velocities at wellhead
This information helps operators to understand better the behavior of the storage and take optimal decisions concerning gas storage operation.