Formation Pressure 0 Psig

3. $ INDICATE RANGE OF PROBABLE ERROR

Figure 7-15. Comparison of effect of chemical additives with water on drilling rate of Indiana limestone with a 3-blade micro-drag-bit at 50 rpm and 500 ib. bit weight. (From Robinson.23 Copyright 1967 by SPE-AIME.)

Figure 7-16. Variation of (a) zeta potential, (b) pendulum hardness, and (c) rate of penetration for calcite in water buffered environments. Note: The rate of penetration of the spade bit is given as total depth penetrated in the first 60 seconds. (From Jackson etal.26)

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