Project Profile
Value: Undisclosed
Location: OML 26, onshore Nigeria
Production: 5,000 bopd
Reserves: 677 mmbbls (Ogini) and 100 mmbbls (Isoko)
The Ogini Field (Ogini) and Isoko Field (Isoko) are located in OML 26 onshore Nigeria and were originally awarded to Shell Petroleum Dev. Co of Nigeria Ltd (SPDC) in 1959. The partners currently are Afren Plc through First Hydrocarbon Nigeria Limited (FHN) with 45% interest and NNPC with 55% interest. The Ogini field, located about 63 km east of the town of Warri onshore Nigeria, was discovered in 1964 and commenced production in 1971. 23 wells have been drilled at the field to date, all encountering excellent quality reservoirs at depths of between 5,500 and 12,000 ft and there is an extensive good quality 2D seismic database also available. The field consists of a simple low relief roll-over anticline with bounding faults to the northeast and southwest. The field has excellent reservoir properties with typical porosity of around 30% and permeability in the multi-Darcy range.
The Isoko field is located about 7km south west of Ogini, and was discovered with the Isoko-1 exploration well in 1959 and commenced production in 1976. Seven wells have been drilled at the field to date, all of which encountered hydrocarbons in excellent quality reservoirs at depths between 8300 ft and 13,300 ft. The field has excellent reservoir properties with typical porosity in excess of 30% and permeability in the multi-Darcy range. Structurally, the field comprises a deep seated, broadly east to west trending collapsed rollover anticlinal structure.
Independently estimated STOIIP for Ogini and Isoko has been estimated at 677 mmbbls and 100 mmbbls respectively, of which approximately 47 mmbbls and 27 mmbbls had been recovered at end 2010 (equating to recovery factors of just 7% and 10%). Current production from the fields at the time of completion was approximately 5,000 bopd from a limited number of drainage points. The joint venture has defined a phased work programme to ultimately increase gross production at the Ogini and Isoko fields to 50,000 bopd. To date, only vertical production technology has been used at the fields with a limited number of wells drilled. The joint venture intends to maximise economic oil recovery from the reservoirs primarily through implementing near term “quick-win” measures on existing wells including re-activation of gas lift, followed by the drilling of several new horizontal production wells. The Ogini and Isoko fields are currently producing from a limited number of currently active drainage points. Several wells are currently shut in and there is significant potential for further redevelopment. Under the proposed development plan, initial work is focused on certain ‘quick-win’ opportunities including low-cost workovers of existing wells and reactivation of gas lift to existing wells. From the existing wells, the Block attained production of 10,500 bopd with optimised compressor uptime in December 2011. The partners will next seek to mobilise a land rig to the field location in order to commence drilling new development wells and undertake de bottlenecking work of surface facilities.
A three phase field re-development has been defined for the Ogini and Isoko fields that is ultimately expected to increase gross output from Ogina and Isoko to 50,000 bopd. Work that will be undertaken includes the drilling of up to 40 development wells and, with existing well locations being expanded to accommodate multi-well clusters that will enable a tighter well spacing to maximise sweep efficiency of the reservoirs. Workovers and side-tracking of existing production wells will also be undertaken along with de-bottlenecking of existing production handling and export facilities. Gas lift and other pressure support methods as deemed appropriate will also be implemented.
Ogini has fallen foul of the fall-out from the Afren debacle, via FHN. No updates as at October 2016
Operators:
NNPC: Operator with 55% interest
Afren Plc (First Hydrocarbon Nigeria Limited (FHN)): 45% interest