Meaning balanced activity oil mud
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balanced activity oil mudAn oil-base mud in which the activity, or vapor pressure, of the brine phase is balanced with that of the formations drilled. Although long shale sections may not have a constant value for vapor pressure, aw, the oil mud will adjust osmotically to achieve an "average" aw value. Dynamic (autopilot) balance of mud salinity and drilled shale [..]
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