environment summary - buffalo25 May 2021 10:19
this is carnarvons environmental summary for the buffalo drill...
https://docs.nopsema.gov.au/A680750
While not planned as part of the operations, there are options for side-track drilling, re-drilling of particular
sections of the well and possible re-spud of the well if warranted.
Drilling Program
The Buffalo East-1 well design entails drilling a conductor surface hole section (36”), two intermediate hole sections (17 ½ and 12 ¼”) and the 8 ½” production1 hole section. The surface intervals (or conductor hole) will be drilled ‘riserless’ using seawater with viscous sweeps utilising bentonite or a viscosifying polymer and a viscosified brine. Fifteen percent (15%) of cuttings (54.5 m3) and well returns (e.g. sweeps) from the 36” open hole will discharge directly into the seabed.
Cement will be used to form permanent barriers and fix casing strings in place in accordance with the approved
NOPSEMA Well Operations Management Plan (WOMP) and industry best practice. Once the surface conductor string is cemented into place, a closed loop circulating system will be created firstly by use of the riserless system (RMR) for the 17 ½” hole section then via the high pressure rig drilling riser and BOP’s. Following drilling the 17 ½” hole the 13 3/8” intermediate casing string will be ran and cemented in place. The Drilling rigs high pressure drilling riser and BOP’s will then be installed for the remainder of the well. After the surface blow-out preventers (BOPs) have been installed, recirculating water-based drilling fluids will be used to drill the remainder of the well in the 12 ¼ and 8 ½” hole sections with 44% of cuttings (159.1 m3 ) circulated to the MODU for mechanical separation and treatment.
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