mud density | Energy Glossary

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mud density

1. n. []

The mass per unit volume of a drilling fluid, synonymous with mud weight. Weight is reported in

  • lbm/galUS (also known as ppg)
  • kg/m3 or g/cm3 (also called specific gravity or SG)
  • lbm/ft3
  • hydrostatic gradient: lbm/in2/ft (psi/ft) or pptf (psi/1,000 ft).

Mud weight controls hydrostatic pressure in a wellbore and prevents unwanted flow into the well. The weight of the mud also prevents collapse of casing and the openhole. Excessive mud weight can cause lost circulation by propagating, and then filling, fractures in the rock. Mud weight (density) test procedures using a mud balance have been standardized and published by the API.

Alternate Form: mud weight

See: bland coring fluidcalcium bromidecesium acetatecesium formateequivalent circulating densityformategunning the pitshigh-gravity solidskill-weight fluidkilogram per cubic metermudmud balancemud programpressurized mud balancePVTsagslugweighting material