Density of Bentonite Slurry ASTM D4380

Standard Test Method for Density of Bentonic Slurries
ASTM D4380-12

Work Instruction

1. APPARATUS
1.1. Mud Balance

2. PROCEDURE
2.1 Set up the instrument base approximately level.
2.2 Fill the clean, dry cup with slurry to be tested, place the cap on the cup, and rotate the cap until firmly seated. Make sure some of the
slurry is expelled through the hole in the cap to free trapped air or gas.
2.3 Wash or wipe the excess slurry from the outside of the cup.
2.4 Place the beam on the support and balance it by moving the rider along the graduated scale. The beam is horizontal when the levelling bubble is on the center line.
2.5 Read the density at the side of the rider toward the knife edge.

3. REPORT
3.1 Record the density to the nearest 0.01 g/cm3.
API 13B-1

4 Drilling fluid density (mud weight)
4.1 Principle
This test procedure is a method for determining the mass of a given volume of liquid (equivalent to density). Drilling-fluid density is expressed as grams per millilitre or kilograms per cubic metre (pounds per gallon or pounds per cubic foot).
4.2 Apparatus
4.2.1 Density-measuring instrument, of accuracy to within 0,01 g/ml or 10 kg/m3 (0,1 lb/gal or 0,5 lb/ft3). The mud balance is the instrument generally used for drilling-fluid density determinations. The mud balance is
designed such that the drilling-fluid holding cup, at one end of the beam, is balanced by a fixed counterweight at the other end, with a sliding-weight rider free to move along a graduated scale. A level-bubble is mounted on the beam to allow for accurate balancing. Attachments for extending the range of the balance may be used when necessary.
The instrument should be calibrated frequently with fresh water. Fresh water should give a reading of 1,00 g/ml or 1 000 kg/m3 (8,33 lb/gal or 62,3 lb/ft3) at 21 °C (70 °F). If it does not, adjust the balancing screw or the amount of lead shot in the well at the end of the graduated arm as required.
4.2.2 Thermometer, with a range of 0 °C to 105 °C (32 °F to 220 °F).
4.3 Procedure
4.3.1 The instrument base should be set on a flat, level surface.
4.3.2 Measure and record the temperature of the drilling fluid.
4.3.3 Fill the clean, dry cup with drilling fluid to be tested; put the cap on the filled drilling-fluid holding cup and rotate the cap until it is firmly seated. Ensure that some of the drilling fluid is expelled through the hole in the cap in order to free any trapped air or gas (see Annex D for information on air or gas removal).
4.3.4 Holding the cap firmly on the drilling-fluid holding cup (with cap hole covered), wash or wipe the outside of the cup clean and dry.
4.3.5 Place the beam on the base support and balance it by moving the rider along the graduated scale. Balance is achieved when the bubble is under the centreline.
4.3.6 Read the drilling fluid density from one of the four calibrated scales on the arrow side of the sliding weight.
The density can be read directly in units of g/ml.

4.4 Calculation
4.4.1 Report the drilling fluid density to the nearest 0,01 g/ml or 10 kg/m3.

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