The Amosing 7 appraisal well drilled using the Marriot Rig 46 has encountered 25 meters of net oil and gas pay concluding the 2017 exploration and appraisal drilling campaign on a high. The Ngamia-11 appraisal well (143 meters of net oil pay) has also been completed and will be utilized in a waterflood pilot test planned for the first half of 2018.
The appraisal saw the drilling of multiple appraisal wells in the Ngamia, Amosing and Etom fields including: Ngamia-10 (65 meters of net oil pay), Amosing-6 (35 meters of net oil and gas pay) and Etom-3 (25 meters of net oil and gas pay). Other than the drilling the programme also carried out an extensive wireline evaluation program, including sampling has been undertaken on all appraisal wells. According to the operator Tullow Oil the Ngamia-10, Amosing-6 and 7 and Etom-3 wells have all improved the definition of the limits of their respective fields.
Tullow Oil says it is however concerned by the presence of rift edge facies which has limited the net pay of the three respective fields and now says these drilling results will be incorporated into the geological models that will be utilized for potential fields development plans.
At the Etom field the joint venture tested the Auwerwer and Lokone reservoirs in the Etom-2 well utilising artificial lift and flowed at 752 bopd and 580 bopd respectively which was lower than anticipated. The Joint Venture Partners now say they will undertake further technical work to assess how representative the tests may have been and identify potential options to increase flow rates from the Etom field.
Activity now moves to focus on collecting dynamic field data through extended production and water injection testing which will include the previously drilled Ngamia 3, 6, 8 and 11 wells for the waterflood pilot.
Additionally, the partnership aims to initiate extended well testing on wells in the Amosing and Ngamia fields, commencing in the first quarter of 2018. Produced oil from testing will be stored and is planned to be transported as part of the Early Oil Production Scheme (EOPS).
This scheme is now expected to commence in the first half of 2018, subject to receiving the necessary consents and approvals.
“In East Africa, both our projects are making steady progress towards Final Investment Decisions with our Kenyan business beginning the important shift from exploration and appraisal to development,” said Tullow Oil CEO Paul McDade.
Operational activities to support the Final Investment Decision (FID) for the Kenya Full Field Development, engineering studies and contracting activities are under way in preparation for the start of the Front End Engineering Design (FEED) which are expected to take place during 2018.
Tullow Oil is the operator in Blocks 10BB and 13T with 50 percent working interest while Africa Oil and Maersk og Gas/Total have 25% each.