Constant Bottom Hole Pressure (CBHP)
Methodology within MPD, Proactive Category; whereby bottomhole pressure is kept constant during connections to compensate the loss of 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
Source: IADC UBO / MPD Glossary, December 2011. Global Standards