Page 146 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

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Single test wlth two gauges. Left gauge suggests hohly permeable
lko tests with the same gauge. Second build-up extrapolated pressure formation with little or no skim - maybe negative - &!e rQht curve indicates
ia lower than that of first buildup. Depletion of a small reservoir gauge which plugged upon reaching bottom and unpluggad when starting out
might be suggeslell.
of hole. If tight gauge was at bottom. it was probably stuck in dekis
at botlom of hole.

TWO tests wlth the sama gauge. chamter of the cms tm the And
teat dim appreciabty from tha of the fltst test. Skk or other Shgk test with two gauges. Left gauge shbws gradual @u&g below
parameter in the fbw and buii-up equations which migm be sensititive gauge'while fight gauge shows actual behavlor of the mservolr. Left
to flow or shutin haa dmged between the two tests. Since mnm fluid gauge measures weighl of Rulds above gauge rather than msewoir
entered driilng durlrg first ted. initial pressure of second characteristics. The two am not identical because a plug in the fbw
test will be M@er than mat of first teat by the weight of thia stting haa remd the connection wen the two pressure 80- which
Ruid column. am in balance in lhe normal lest.

-le teat with two gauges. The two sets of curves should be identlcat Slngle test with two gauges. bft gauge measures reservoir: cham.
except for the small dlffem in pessure related to location of the leristks while fit gauge plum while going into the well and dd
within the flow string. This is the normal condlion to be ex- not unphig until inspecled at surface.
pected if born gauges am operaling pmperly and no plugging. &., is
occurring.
Figure 5-63. Continued.