- Kareem (2016) Z-factor correlation @model
- Kelvin (temperature unit) = °K
- Kendall correlation coefficient @ model
- Kendall-Monroe viscosity blending equation
- KGD Hydraulic Fracture @model
- kh-Specific Flowrate
- Killing a well
- Kilogram = kg
- KiloJoule = kJ
- Kilopascal = kPa (unit)
- Kinematic viscosity
- Kinetic coefficients
- Klinkenberg correction
- kPa
- Momentum diffusivity
- Vertical-to-horizontal permeability ratio = kv/kh = kz/kr