• Mud Resistivity
       
Input Field(s)    
Resistivity of mud (Rm) ohm-m
Constant - Km  
       
Output Field(s)      
Mud Filtrate Resistivity (Rmf) ohm-m
Mudcake Resistivity (Rmc) ohm-m

  • Calculation Guide
  • Overview
    • Estimate the resistivity of mud filtrate and mudcake using mud resistivity
  • Equations
    • Rmf = Km Rm 1.07
    • Rmc = 0.69 Rmf (Rm/Rmf) 2.65
    • --------------------------------------------------
    • Rmf - Resistivity of mud filtrate (ohm-m)
    • Km - Constant based on mud density
    • Rm - Resistivity of mud(ohm-m)
    • Rmc - Resistivity of mudcake (ohm-m)
    • --------------------------------------------------
    • Mud Density(lb/gal) - Km Correlation
    • 10 ppg - 0.847
    • 11 ppg - 0.708
    • 12 ppg - 0.584
    • 13 ppg - 0.488
    • 14 ppg - 0.412
    • 16 ppg - 0.380
    • 18 ppg - 0.350
  • Assumptions
    • Equaitons apply for most muds except lignosulfonate
  • Reference
    • Standard Handbook of Petroleum and Natural Gas Engineering; Lyons, Plisga
  • Unit Conversion Tool