Rig Mobilized for Buffalo-10

Source: www.gulfoilandgas.com 12/22/2021, Location: Not categorized

• Valaris JU-107 jack-up drilling rig is being mobilized to the Buffalo-10 location
• Buffalo-10 focused on confirming sufficient hydrocarbons to support an economic development
• The well is estimated to take around 35 days to complete

Carnarvon Energy Limited is pleased to announce that the Valaris JU-107 jack-up drilling rig is currently en-route to the Buffalo-10 location. Drilling is expected to commence within a week.

Drilling Plan
Buffalo-10 is to be drilled offshore Timor-Leste within the TL-SO-T 19-14 Production Sharing Contract (PSC) in around 30 metre water depth. The well is being drilled to test for the presence of commercial quantities of hydrocarbons (oil) that could ultimately result in a re-development of the field.

The Valaris JU-107 jack-up mobile offshore drilling unit (MODU) has been contracted to undertake the Buffalo10 drilling campaign.

The estimated time to drill and complete the well is around 35 days (success case, trouble free).

The base case well design is:
• drill 36” x 26” hole and set 30” x 20” Conductor at around 120 metres;
• drill 17 ½” hole and set 13 ?” Surface Casing at around 800 metres;
• drill 12 Ό” hole and set 9 ?” Intermediate Casing at around 2,800 metres; and
• drill 8 ½” hole and set 7” Production Liner to approximately 3,500 metres (success case).

In the success case, the Buffalo-10 well will be suspended with an unperforated liner, cemented across the reservoir in order for the well to be re-entered and completed for production at a future date.

Geological Plan
Carnarvon acquired the permit containing the Buffalo field in 2016, and immediately set about reviewing the potential in the Buffalo field using technology that was not available at the time of the previous development. Reprocessing of the 3D seismic dataset using modern full waveform inversion (FWI) technology supports an interpretation of a significant attic oil accumulation remaining after the original development. The extent of this attic accumulation will be tested when the well is drilling through the Elang reservoir in the 8 ½” hole section, where it is prognosed to penetrate both the existing oil column and assess the extent of the attic column, as illustrated in the figure below:

Reservoir modelling utilised the updated structural interpretation of the field which was based on modern reprocessed seismic data. The model then incorporated extensive history-matching, involving calibrating model / well performance to historical production rates and water-cut development (governed by strong aquifer drive) observed during the original production period. This work led Carnarvon to estimate contingent resources in the Buffalo oil field of 31.1 million barrels (2C), with low estimates of 15.3 million barrels (1C) and high estimates of 47.8 million barrels (3C).

Ascertaining the volume of oil remaining will require an assessment of both the height of the attic as well as reservoir and fluid properties. This information is expected to be acquired during the drilling of the Buffalo10well and be assessed once the drilling operations have been completed.

With the minimum economic field size estimated to be significantly lower than the mid case estimate, there is a strong likelihood the Buffalo-10 well will confirm an economic project. Accordingly, Carnarvon’s drilling plans provide for the Buffalo-10 well to be retained as the first production well in the redevelopment program.

Field History
The Buffalo field was discovered in 1996 by BHP and produced from 1999 to 2004, with the last well, Buffalo9, being drilled in 2002. In 2005 the lease on the FPSO ended, and coupled with declining production rates, increasing water cut and decreasing gas availability for gas-lift, the field was abandoned. All wells were plugged and abandoned, and the infrastructure removed. The Buffalo field resides in Timor-Leste in the TL-SO-T 19-14 PSC in which Carnarvon holds a 50% interest.


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