PDC has undertaken two studies for Repsol YPF as part of the client’s $4.3 billion investment project in Argentina.
The studies have entailed an integrated field-wide technical and commercial evaluation of the re-development of the Lunlunta Carrizal oilfield. The field is located in the Cuyo basin in Mendoza Province close to the Andean foothills in Western Argentina. The field was discovered in 1953 and put on production in 1955. Developed in three phases, there are now 122 development wells drilled into the field. Three of these are horizontal wells.
The first part of the programme entailed a “Visualisation” study to identify re-development options for the field. The “Visualisation” objective was to screen potential options for further detailed evaluation. This study entailed the building of a coarse grid Petrel reservoir model and undertaking material balance and other analytical methods to emulate field performance. The key outcome was to identify the potential for a targeted workover campaign to realise a low cost improvement in reserves recovery.
The second phase of the programme entailed a “Conceptualisation” study to select the optimum development programme for the remaining field life. The “Conceptualisation” objective was to undertake a detailed integrated technical and commercial study of all elements of the field development. The following were the key elements of the study:
- 3D seismic interpretation and EEI attribute evaluation
- Petrophysical evaluation of 40 wells
- Construction of fine-grid Petrel static model and migration to Eclipse for dynamic modelling
- Detailed well performance review and history match with material balance
- History matching and life-of-field forecasts for incremental developments
- Facilities and drilling performance and cost review. EOR review. Economic evaluation
- Generate optimised life-of-field re-development programme
Key recommendations identified significant added value through a specific workover campaign and the expansion of a secondary recovery programme. Additionally an EOR pilot was recommended. Probable reserves were increased nearly threefold.
The project team included all appropriate disciplines sourced from PDC and associated consultants. The client approved the final report and has awarded PDC a further regional study in Argentina.
We would like to let you know our intention to continue with our working relationship in order to initiate the Conceptualization Phase of the areas you assisted us during the Visualization Phase.
Pablo Alonso Cao, RepsolIYPF