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Ghana and West African Equatorial Atlantic
In Ghana and Uganda, Tullow had major operational success throughout the year.
In the Equatorial Atlantic region offshore West Africa Tullow has interests in 10 blocks across four countries: Sierra Leone, Liberia, Côte d’Ivoire and Ghana. 2010 has been a period of strong delivery for Tullow’s operations in Ghana, culminating in the delivery of First Oil from the Jubilee field in November. Exploration and appraisal success continued throughout the year in Ghana and Sierra Leone where significant new fields have been discovered. The Group’s extensive 2011 drilling programme has the potential to transform this area into one of Africa’s most substantial oil producing regions.
First Oil from Jubilee field Phase 1 development
Production from the Phase 1 development of the Jubilee field commenced on 28 November and was inaugurated by the President of Ghana on 15 December 2010. This milestone was achieved around 40 months after discovery of the field, with top quartile safety performance, and the final cost is expected to be within 5% of the original $3.1 billion budget. The project has set a significant new global benchmark for the delivery of major deepwater developments.
Average working interest production
Gross production of over 69,000 bopd has been achieved from five wells and full production capacity of 120,000 bopd is expected to be reached in the next five months as the remaining four production wells are completed and brought on line. On 5 January 2011, the first lifting of Jubilee crude oil, a 650,000 barrel Tullow cargo, was successfully completed. Once plateau production is reached an average of three offtakes are expected each month. Water injection to two wells is currently around 110,000 bwpd and a further four water injection wells will be completed during 2011 to maintain plateau oil production levels. Gas injection will commence in March and a second injection well is expected to be completed in the third quarter of 2011.
Deep Pioneer installing subsea equipment on the Jubilee field, offshore Ghana.
Further phases of Jubilee development
Planning work for Phase 1a of the Jubilee development, to comprise between five and eight further wells, commenced in the fourth quarter of 2010. This development will help maintain field production at plateau levels and develop further reserves. It is anticipated that the investment decision will be made in the third quarter of 2011 following analysis of reservoir performance and submission of plans to the Government of Ghana. Sub-surface planning work is well advanced and has already identified the additional well locations. A deepwater rig to execute the programme, starting early in 2012, is currently being tendered.
From Jubilee discovery to First Oil
The operator of the West Cape Three Points (WCTP) licence submitted a Declaration of Commerciality for the Mahogany East Area (previously known as Southeast Jubilee area) in September 2010. The Plan of Development for the Mahogany East Area is currently under discussion with the Government of Ghana. The development of the Mahogany East Area reservoirs, which are extensive but generally thinner than in the main Jubilee reservoirs, is currently planned to consist of a four-to-six well tie-back to the existing Jubilee subsea infrastructure when capacity is available. However, an accelerated development as part of an integrated project with other WCTP discoveries may be considered depending upon further exploration and appraisal success in the WCTP licence.
Enyenra (formerly Owo) and Tweneboa
In February 2010, the first appraisal well on the Tweneboa field, Tweneboa-2, in the Deepwater Tano licence offshore Ghana, intersected a significant combined hydrocarbon column. Coupled with the Tweneboa-1 discovery in 2009, Tweneboa was established as a major gas-condensate and oil field.
In July 2010, the Owo-1 and Owo-1 sidetrack wells continued the success of Tullow’s West African Equatorial Atlantic drilling campaign. The wells intersected a total of 69 metres of net oil pay in a substantial gross oil column of 200 metres and established Enyenra as a major new oil field in its own right. The wells also intersected 13 metres of net condensate pay and six metres of net gas pay below the Enyenra oil field.
A campaign of appraisal wells and flow tests has now commenced across both the Enyenra and Tweneboa fields. The programme is designed to determine reservoir extent and connectivity and to provide rock and fluid data. The first well in this campaign was Tweneboa-3, drilled in December 2010, which confirmed producible gas-condensate at this location. In February 2011, Enyenra-2A was drilled and encountered oil in excellent quality reservoirs which are in communication with the original Owo-1 discovery well located 7km up-dip. The result confirms Enyenra as a major light oil discovery. The activity programme this year will lead to a Declaration of Commerciality for the Enyenra and Tweneboa fields being submitted to the Government of Ghana later in 2011. The expected schedule of wells includes Tweneboa-4, Tweneboa-DST, Enyenra-3A, Enyenra-DST and Enyenra-4A.
Development studies for both fields are focused on optimising the recovery of the light oil discovered at Enyenra and maximising both liquid and gas recovery from the Tweneboa field. Conceptual developments include the use of a large FPSO with liquid rates in the range of 75,000 to 125,000 bopd. Water and gas is expected to be injected into the reservoirs to optimise both oil and condensate recovery levels. Gas export infrastructure to shore will also be put in place to satisfy the growing demand in Ghana. A Plan of Development will be prepared for submission in the first quarter of 2012 and, pending approvals and a timely sanction of the project, first production would be anticipated before the end of 2014.
Jubilee
On 15 December 2010, celebrations were held to mark First Oil from the Jubilee field offshore Ghana Link: Production and development
