MEASURING THE VISCOSITY OF DRILLING MUD
NOTE A In addition to the Marsh Funnel, this procedure requires a container to collect a mud sample, a graduated container to receive the mud as it flows out of the funnel, some way to measure elapsed time (preferably a stop watch), and a centigrade or fahrenheit thermometer for measuring the temperature of the mud sample (See the Parts List).
NOTE B The Marsh Funnel should be clean and dry before beginning this procedure.
PROCEDURE
1. Collect a fresh mud sample.
2. Hold the funnel erect with a finger over the outlet tube, and pour the mud into the funnel through the screen until the mud level reaches the bottom of the screen (The screen will filter out the larger particles that could clog the outlet tube).
NOTE C When the Marsh Funnel is filled to the proper level it holds more than one quart of mud.
3. Quickly remove the finger from the outlet tube, and at the same time, begin timing the mud outflow.
4. Allow one quart (946 cc) of mud to drain from the Marsh Funnel into a graduated container.
5. Record the number of seconds it takes for the quart of mud to flow out of the funnel, and report this value as the Marsh Funnel Viscosity. Also record the temperature of the mud sample in degrees F or C.
CARE OF THE FUNNEL
Follow these suggestions to care for the Marsh Funnel:
1. Clean and dry the funnel thoroughly after each use.
2. Take special care not to bend or flatten the brass outlet tube at the bottom of the funnel. The Marsh Funnel Viscosity readings are computed using the exact diameter of this outlet and if the outlet is distorted the readings will be inaccurate.
CALIBRATION CHECK
Periodically check the calibration of the Marsh Funnel by measuring the viscosity of fresh water. The funnel is dimensioned so that the outflow of one quart (946 cc) of fresh water at a temperature of 70‘±5‘F (21‘±3‘C) is 26±0.5 seconds. If the Marsh Funnel checks out of calibration, it should be cleaned again, using a pipe cleaner, to make sure that there is nothing obstructing the outlet. If the Marsh Funnel continues to give an incorrect reading for fresh water after cleaning then the outlet tube probably has been bent out of shape and the funnel should be replaced.
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Marsh Funnel Viscometer Specifications
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Part No.
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Model
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Description &Technical Parameters
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Remarks
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110-10
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MLN-4
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Components: Plastic Funnel , Standard Cup,
1000ml Mud Cup and stop match
Material: Engineering plastic
Mesh:1.6mm
Capacity of funnel:1500ml
Accuracy:It is calibrated to outflow one quart (946 ml) of
fresh water at a temperature of 70 ± 5°F
(21 ± 3°C) in 26 ± 0.5 seconds
Size: 150 × 205 × 380 mm ,(3.8" × 5.2" × 9.7")
Volume Weight: 3 kg (6.6lb)
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110-12
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MLN-4A
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Components: Stainless steel Funnel , Standard Cup,
1000ml Mud Cup and stop match
Material: Stainless Steel
Mesh:1.6mm
Capacity of funnel:1500ml
Accuracy: It is calibrated to outflow one quart (946 ml) of
fresh water at a temperature of 70 ± 5°F (21 ± 3°C)
in 26 ± 0.5 seconds
Size: 150 × 205 × 380 mm ,(3.8" × 5.2" × 9.7")
Volume Weight: 3 kg (6.6lb)
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