During the past year, Candax has taken the initiative to set up a Geosciences Committee and reinforced its geosciences capabilities in Tunis. A full Geological and Geophysical ("G&G") action plan has been designed by Candax's Geosciences Committee and is currently being implemented by the geosciences team in Tunis. All data available to Candax has been inventoried and archived in the Company database. Additionally, all of the related seismic and well data has been uploaded into a workstation in the Tunis office and a regional reinterpretation of southern Gulf of Gabes area has commenced. The regional reinterpretation of this data initially focused on the Deep Triassic.
The El Bibane field is located 16 kilometres offshore from the port of Zarzis in the Gulf of Gabes, in approximately 20 metres of water. The field was discovered by Marathon Oil Corporation in 1982, but was not developed until 1998. Initially, the field produced at a rate of 4,000 bopd. The reservoir is located in the Cenomanian Zebbag fractured dolomite formation at approximately 2,150 metres below surface. High water-cut and associated gas production led to a field redevelopment plan achieved in 2008, with two horizontal wells (EBB-3 and EBB-4) and a vertical well (EBB-5) drilled on the top of the anticline structure.
In 2011 Candax contracted Beicip-Franlab, a leading petroleum consulting firm, to conduct a full-field compositional simulation study. Results indicated that the oil-water contact had moved up significantly due to past production of the gas cap. This explained the very high water-cut observed on the two horizontal wells, EBB-3 and EBB-4, and the relative failure of the 2008 re-development plan.
In April 2012 a new production scheme was proposed by the Company to the Tunisian authorities (Direction General de l'Energie, "DGE"). It was decided to initiate a gas cycling pilot program designed to increase condensate recovery as well as the potential for oil recovery from the El Bibane reservoir by producing wet gas from EBB-5 and reinjecting dry gas in EBB-4. The gas injection process started in May 2012 with stabilized condensate production of over 200 bopd at the onshore plant. Anticipating an increasing flow rate, Candax performed a successful well intervention in EBB-4 in October 2012 using a work barge positioned alongside the platform, in order to configure the well for long term gas injection.
The Ezzaouia field is located on the Zarzis peninsula, in the southern Gulf of Gabes. Marathon Oil Corporation discovered the field in 1986 and brought it onstream in 1990. Candax is the sole partner of ETAP with a 45% equity interest. The field is operated by Maretap, a 50/50 (Ecumed/ETAP) joint venture company. Maretap does not own any assets and operates on a cash call basis. Two reservoirs are present in Ezzaouia field: the late cretaceous Zebbag fractured dolomite and the late Jurassic M'Rabtine sandstone. The Jurassic M'Rabtine reservoir now contributes most of the production from the field.
A reprocessing of the 3D seismic data in 2011, followed by a structural reinterpretation and an update of the reservoir model in 2012 indicated that a significant volume of remaining reserves could still be produced, mainly from the Jurassic reservoir. This provided a strong incentive for the partners to reconsider the Ezzaouia field strategy in order to rejuvenate field production.
Most Popular Stories
- Bipartisan Budget Deal Gets Key Support in House
- TFA Recruiting DACA Recipients
- Bitcoin Clones Lurch Onto Financial Scene
- Clinton to Keynote Annual Simmons Leadership Conference
- Holiday Shopping Off to a Slow Start This Season
- Scotch Whisky Sales Raise Distillers' Spirits
- Health Coverage Disparities Emerge Among States
- Fake Deaf Interpreter Was Hallucinating, Has Schizophrenia
- Podesta Likely to Reject Keystone XL
- Tea Party Glum in Face of Bipartisan Budget Deal