A Hughes Christensen drillable 12-1/4 feet EZCase bit was used. This is the longest CWD run with this system in the Eastern Hemisphere.
Northern Petroleum Nederland B.V. has utilized casing drilling technology on the automated drilling rig (LOC 400). The rig was newly fabricated by Northern Dutch Drilling Company and the CWD run was the first well for the rig and crew since manufacture.
The Hughes Christensen EZCase bit drilled the 780m from surface in 71 hours with a Rate of Penetration (ROP) of 11 m/hr (36 ft/hr) using controlled drilling. The casing was successfully cemented through the bit with no difficulty. The EZCase bit was then drilled-out through its centre in 1.5 hours using a specially designed 8-1/2′ Polycrystalline Diamond Compact (PDC) bit. This bit has enabled both drill- out of the casing bit and continuous drilling ahead for the intermediate section of the hole.
The well is currently conventionally drilling ahead towards its reservoir objective.
