Formation fluids
20 October 2021
Mobile offshore drilling unit (MODU)
20 October 2021

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