1. Novel Data Integration for Production Optimization: Two Case Studies
Øystein Tesaker
October 23, 2002
Force Presentation

2. Outline What is reservoir management? Why? Components
Huldra field case
North-sea field case

3. A Typical Field Reservoir Loop Production Loop manifold o Producer
choke
separator g w o
Completion
Artificial Lift
gas Lift gas
manifold
Production from other fields
Producer
Injector
Reservoir Loop
Time Scale: Month-Year
Production Loop
Time Scale: Day-Month

4. Reservoir Management Reservoir Loop (months-years) Production Loop
Reservoir Characterization
Development Planning & Execution
(includes economic)
Production Loop
(days-weeks)
Identify KPI
Update OP
Production Monitoring
Review PLP and RLP
Reservoir Monitoring
KPI: Key Performance Index
PLP: Production Loop Performance
RLP: Reservoir Loop Performance
OP: Operating Plan

5. Economics
2-3% production rate improvement acheivement by use of production optimization is documented
For Statoil 1% increase in production will give 300 MNOK extra

6. Production Allocation
Components
Dynamic link between databases and applications
Production optimization
Production Follow-up system
Allocation
Well Relevant data storage
Well history
Expert System
(offline/online)
Production Allocation
Data Acquisition
Data Acquisition/distribution
Data Integration
Well Performance Indicators
Automation
Field Instrum
entation
Good instrumentation (downhole gauges, accurate wellhead pressures)
Accurate well testing equipment (multiphase meters, test separators)

7. Field Examples Huldra Data integration system License X
Production Optimization system

8. Huldra Gas-condensate reservoir
Start of production: Nov (life ~11 years)
Reservoir depth 3800m, initial pressure 676 bar and temperature 146oc
6 wells in separate fault blocks
All wells have downhole P&T gauges and wellhead multiphase meters
Objective of production system
One place to maintain time series data (raw data, eclipse simulation forecasts, official allocated data, other calculated time series data)
Should be able to link up to various systems to consolidate data
Should allow easy import and export of data

9. Huldra Data Acquisition
Measurements from Instrument
Bottom-hole P & T
Meter FlowRates, P & T, diagnostics
Measurements via Control System link
WellHead Pressure & Temperature
Sand Production
Choke Positions
Export line flowrates
Automatic Import
PROSTY allocated daily rates
Manual Import
Eclipse Simulation
PVT Tables
Vertical Lift Tables
Total of about 100 tags per well
Control System
P&T Gauges
Meter
Dacqus

10. Sharing Data Between Partners
Client
Firewall
Log-Server
Platform
Conoco and TFE Offices
Client
(several)
Client
Replicator
Office
Pseudo
Sensor
Engine
Client
SQL
Allocation DB
Client
Statoil Facilities
Possible due to Client-Server System

11. Dacqus Client on Huldra

13. Statoil Dacqus Configuration

14. Production Information Management
Information management of time series data
Works with/without offline/online data
Client 1
Client 2
Client N .
Data Visualization
Calculation of online & historical data on the fly
TimeSeries
database
Data
Acquisition
Import/Export
To/From
Files
Atm/Manual
Import From
SQL Dbs
Import of
Simulation
Forecasts
Data Distribution
Data Acquisition
Data Calculation

15. Production Allocation
Field X
Data Acqusition
PROSTY
Production Allocation
Excel Interface
Gap
Network Modelling
Prosper
Well-Modellling

16. Gap Network Model

17. Well-testing/optimisation Basics
choke
separator g w o
Completion
manifold
Production from other fields
Pressure
Rate
Sandface
Wellhead
Pres
Choke

20. Well-test Approval

21. Result 1000 m3/day production increase is indicated by GAP
In fall 2002 the system will go in active use to verify results
Similar interfaces now being developed for other Statoil licenses

22. Conclusion Active reservoir management pays-off.
Reservoir description without proper data management is impossible.
Data acquisition and distribution is key.
Dynamic links between databases and expert systems are key to make full use of data.

23. Acknowledgements Raghu Kulkarni, Statoil Alf-Øverland, Statoil
Helge Ramstad, Statoil