Izabela, operated by EDINA, is an offshore gas asset located in the Croatian Adriatic Sea. It is a two-platform structure with five producing wells and came onstream in 2014.
Energean has a 70% W.I. while the remaining 30% belongs to INA. Production from Izabela is expected to decline to zero by 2021. However, Edison E&P expects to spud the Irena-2 appraisal well in 2020.
Fields and history
The Izabela field is in the central part of the block and the Irena field is located approximately 7 kilometers north of the Izabela field, in the northern part of the block.
The Izabela field is a multi-reservoir dry gas field that was discovered in 2004 and developed with dual-completion wells. The gas-bearing reservoirs are turbidites in the Carola Formation (PLQ-A5) of Lower Pleistocene age (Figure 2). Estimated porosity ranges from 24 to 31 percent, Sw ranges from 35 to 62 percent, and permeability varies from approximately 100 to 900 millidarcys. The Izabela field was evaluated using volumetric analysis of the gas in place coupled with recovery factors derived from anticipated abandonment pressures and the production performance of the wells..
Gas production started in 2014, and the Izabela field utilizes two production platforms and five producing wells. Some of the production strings in the Izabela field have been shut inintermittently to curb water production.
The Irena field is a structural-stratigraphic trap discovered in 2006 and contains a single dry gas reservoir in the Ravenna Formation of Pleistocene age. All reserves estimates for the Irena field were based on the volumetric estimate of gas in place coupled with analogous recovery factors. Estimated porosity and Sw are 38 percent and 15 percent, respectively