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Y
yield |
a term used to define the quality of a clay by
describing the number of barrels of a given centipoise slurry that can be made from a ton
of clay. Based on the yield, clays are classified as bentonite, high yield, low yield,
etc., types of clays. Not related to yield value below. See API RP 13B for
procedures. |
yield point |
in drilling-fluid terminology, yield point
means yield value (which see). Of the two terms, yield point is more common. |
yield value |
the yield value (commonly called "yield
point") is the resistance to initial flow, or represents the stress required to start
fluid movement. This resistance is due to electrical charges located on or near the
surfaces of the particles. The values of the yield point and thixotropy,
respectively, are measurements of the same fluid properties under dynamic and static
states. The Bingham yield value, reported in lb/100 square feet, is determined by
the direct-indicating viscometer by subtracting the plastic viscosity from the 300-rpm
reading. |
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Last Updated:
02/01/2006,
12:31 PM
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