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pete384lab12 - U N I V E RS I TY OF LO U IS IANA-LAFAYET T...

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UNIVERSITY OF LOUISIANA-LAFAYETTE Department of Petroleum Engineering Standard Methods of Testing Drilling Fluids Barite Sag Experiment No 12 PETE 384 SEC 002 April 28, 2009 Submitted To: Ali Ghalambor M Group 7 Members: ett
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Table of Contents SUBJECT PAGE
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Abstract In this experiment, the mud weight of an initial mud was determined while circulating at 600 rpm with a temperature of 120° F, and the results were noted and recorded. The sag mud weight was determined while circulating at 100 rpm with a temperature of 120°F for a time span of 30 minutes. These results were noted and recorded. These two sets of results were used to calculate Viscometer Sag Test (VST), which are illustrated in figure 8.
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Introduction Drilling mud is a combination of clay and water used in drill operations. It is used to carry rock cuttings to the surface and also to keep the drill bit cool and lubricated. Drilling mud has to be free from contamination in order to function appropriately. Sag is the settling of particles in the annulus of a well, which can occur when the mud is static or being circulated. Because of the combination of secondary flow and gravitational forces, weighting materials can settle (sag) in a flowing mud in a high-angle well. If settling is prolonged, the upper part of a wellbore will lose mud density, which lessens the hydrostatic pressure in the hole, so an influx (a kick) of formation fluid can enter the well . Barite Sag is defined as a significant variation in mud density, both higher and lower than the nominal mud weight, while circulating bottoms-up after a trip or a logging/casing run.
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