The NSD System is easily integrated into the rig to facilitate:
Over 4500 connections
105 sections drilled over 5 continents
Over 730 days of rig time saved
Client identified problems with depleted reservoir zones resulting in drilling fluid losses. Relatively unconsolidated and poorly sorted sands present in the field geology. Drilling window narrow due to pore pressure / fracture pressure gradient uncertainties. Client predicted borehole instability, differential sticking, high background gas probability. Managed Pressure Drilling with Continuous Circulation System used to drill with lighter muds (WBM and OBM) and control the ECD/BHP accurately within the drilling window to avoid losses and NPT. Compact footprint of equipment meant this was easily achievable in a limited space environment offshore.
Client observed multiple lost BHA’s whilst drilling surface and intermediate sections leading to multiple side tracks. Losses observed up to and including total losses. Foam drilling technologies were identified and utilised however time spent adding surfactants and breaking down the foam before making a connection added 2-3 days to drilling each section. Heli-Rig operating in the PNG Highlands so equipment footprint and personnel numbers required to be small and light. Continuous Circulation system was used to eliminate stuck pipe and lost BHA’s through maintaining foam drilling over each connection.