Drilling Industry Glossary
waiting on cement (WOC)
water
water activity
water phase salinity
water table
weight indicator
weight on bit (WOB)
well logging
well planning
wellbore
wellpath map
whip stock
wild cat
workover
worm or weavel
Water Activity
Water Activity (Aw) is the water vapor pressure generated by the free water in the mud. The mathematic formula is Aw= (vapor pressure of the water in the mud at °C)/(vapor pressure of pure water at °C). It is used to determine the mud quality when the salts in an oil based mud are too complicated to analysis (usually in field work). Electrohygrometer is employed to measure the Aw value.
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