b- Pressure Drop

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((Refers to the pressure required to overcome the friction between the drilling fluid and specific system section))

1- Drill String Pressure Drop.

2- Annulus Pressure Drop.

3- Bit Pressure Drop.


1- Drill string pressure drop

((Refers to the pressure required to overcome the friction between the drilling fluid and drill pipe))

2- Annulus Pressure Drop

  • ((Refers to the pressure required to overcome the friction between the drilling fluid and annulus))
  • ECD (Equivalent Circulating Density):-

  is the combined pressure being exerted hydrostatically by the mud and the mud pump when the system is circulating.

  • Slip Velocity:-

is the rate at which cuttings fall back toward bottom.

3- Swab & Surge Pressure

  • Swap pressure is a negative value produced by pipe movement up ward.
  • Surge pressure is a positive value produced by pipe movement down ward.

​4- Bit Hydraulics

  • Bit Pressure Drop.
  • Jet Velocity.
  • Hydraulic Horse Power.
  • Impact Force