Formation fluids
20 October 2021Mobile offshore drilling unit (MODU)
20 October 2021Constant Bottom Hole Pressure (CBHP)
Methodology within managed pressure drilling, Proactive Category; whereby bottomhole pressure is kept constant during connections to compensate the loss of annulus friction pressure (AFP) when mud pumps are off.
Typical methods include:
- By keeping continuous circulation during
- By trapping annular pressure prior to shutting down mud
- By diverting mud pump flow across the wellhead