CETCO
Mud Balance & Mud Weight Measurement Tool
FromCETCO
A mud balance is an instrument generally used to determine mud weight that will permit accurate measurement within 1/10 lb/gal or 1/2 lb/ft3. Mud weight can be expressed in lb/gal, lb/ft3, psi/1,000 ft of depth or specific gravity (S.G.). The mud balance should be calibrated frequently with freshwater at 70˚F which will give a reading of 8.33 lbs/gal or 62.3 lbs/ft3.
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- Fill the cup with mud to be weighed.
- Place the lid on the cup and seat it firmly but slowly with a twisting motion. Be sure some mud runs out of the hole in the cap.
- With the hole in the cap covered with one finger, wash or wipe all mud from the outside of the cup and arm.
- Set the knife on the fulcrum and move the sliding weight along the graduated arm until the cup and arm are balanced.
- Read the density of the mud at the left-hand edge of the sliding weight.
- Report the result to the nearest scale division in lb/gal, lb/ft3, S.G., or psi/1,000 ft of depth.
- Wash the mud from the cup immediately after wash use. It is absolutely essential that all parts of the mud balance be kept clean if accurate results are to be obtained.
- Table 1 conversion data available for reference
