Constant 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:

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

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