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Friday, October 24, 2014
Tullow Oil saw some wells drilled in Kenya on Blocks 10BB and 13T with varying success. On Block 10BB the Kodos-1 wildcat well encountered hydrocarbon shows which indicate an active petroleum system, however reservoirs were mixed quality alluvial sands close to the basin boundary fault. The well, which was the first drilled in the Kerio Basin, will be plugged and abandoned.
The rig will is being moved to drill the second well in the basin at Epir-1, 25 km north of Kodos-1 in a separate sub-basin. Following up on the encouraging hydrocarbon shows at Kodos-1, further drilling in the greater Kerio Basin can be expected during 2015.
Also on the block Tullow spud the Ekosowan-1 well, the most southerly well drilled to date in the South Lokichar Basin, 12 km south east and up-dip of the previous Amosing-1 discovery. The well extended the proven oil basin southwards having encountered a 900-meter section of near continuous oil shows throughout an interval of tight faulted sands.
The Ekosowan area is located within the ongoing 3D seismic survey in the South Lokichar Basin, acquisition of which is expected to complete in December this year. Follow up drilling will target better developed reservoir expected between Amosing-1 and Ekosowan-1, further away from the faulting at the basin margin.
The Sakson PR-5 rig drilled the Ekosowan-1 well to a final depth of 2,029 meters. The well will be plugged and abandoned, following which the Sakson PR-5 rig will be replaced by the new SMP-106 rig which is currently mobilizing to the Engomo-1 wildcat well location, the first test of the North Turkana Basin.
Tullow continued its successful appraisal of the Ngamia oil field with the drilling of the Ngamia-4 well. The well was drilled to the west of the original Ngamia discovery and successfully encountered up to 120 meters of net hydrocarbon pay, of which up to 80 meters was oil. The well has been suspended for use in future appraisal and development activities. The PR Marriott Rig-46, which drilled Ngamia-4, will now drill the Ngamia-5 appraisal well. The Ngamia-5 will assess reservoir connectivity in the Ngamia field, the largest oil discovery to date in the South Lokichar Basin.
The SMP-5 workover rig successfully completed four flow tests on the Twiga-2A well, achieving production rates between 150 and 3,270 bpd under natural flow with no depletion, the highest oil production rate seen to date in Kenya. With optimized equipment the maximum flow potential from the best zone could have increased to around 10,000 bpd demonstrating excellent reservoir deliverability. The SMP-5 rig will now move to the Amosing oil field to begin extended well testing, where production and injection interference testing, involving the Amosing-1 and 2A wells, will help provide dynamic flow characterization of the Amosing stacked reservoirs.
Tullow operates the blocks with a 50% stake and is partnered with Africa Oil Corp.
Angus McCoss, Exploration Director at Tullow said: “The Kodos-1 well is the first test of the Kerio Basin and hydrocarbon shows provide encouragement, indicating the presence of an active petroleum system. The potential of the Kerio Basin remains highly prospective and the rig is now moving to drill the next well, Epir-1, in a sub-basin to the north of Kodos-1.
“South Lokichar Basin activity continued with exploration and appraisal drilling and well testing. The Ekosowan-1 well encountered a significant interval of oil shows however reservoirs at this location were tight. We look forward to stepping out from Ekosowan towards the Amosing oil field in pursuit of better reservoirs. Appraisal and well testing success continues with Ngamia-4 finding a substantial section of oil pay and Twiga-2A recording our highest flow rates to date.”
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