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:

  1. By keeping     continuous     circulation     during
  2. By trapping annular pressure prior to shutting down mud
  3. By diverting mud pump flow across the wellhead

Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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