A set of mathematical models relating production rate history of one well to its bottomhole pressure history and offset injection rates history.
In case the bottomhole pressure data is not available it is considered constant over time.
The CRM is trained over historical records of production rate, injection rates and bottomhole pressure variation.
The major assumptions in CRM model are:
- productivity index of producer stays constant in time
- dynamic drainage volume of producer is finite and constant in time (which is equivalent to PSS flow regime)
- total compressibility within the drainage volume of a given producer stays constant in time
Goals | Objectives |
| Identify and prioritise production optimisation opportunities | Generate production and formation pressure forecasts based on the bottom-hole pressure and injection rates |
| Identify and prioritise redevelopment opportunities | Assess productivity index of producing wells |
| Identify and prioritise surveillance candidates | Assess dynamic drainage volume around producing wells |
| Quantify connectivity between injectors and producers | |
| Assess water flood efficiency against expectations and / or between wells or well groups |
Advantages | Limitations |
| Fast-track | It only models injector-producer system |
| Based on the robust input data | Requires eventful history of injection rates variations |
Does not involve full-field 3D dynamic modelling and associated assumptions | Requires productivity index of producers to stay constant |
| Requires production sharing between producers stay approximately the same throughout the time |
Technology
CRM trains linear correlation between variation of production rates against variation of injection rates with account of bottom-hole pressure history records in producers.
See Capacitance-Resistivity Model @model
| Inputs | Outputs |
|---|---|
| Production rate history | Productivity Index for the focus producer |
| Bottom-hole pressure history | Drainage volume by the focus produce producer |
| Injection rate history | Share of injection going towards the focus producer |
| PVT model |
See Also
Petroleum Industry / Upstream / Production / Subsurface Production / Field Study & Modelling / Production Analysis
Capacitance-Resistivity Model @model
References
https://doi.org/10.2118/147344-MS
https://doi.org/10.2118/177106-MS