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CASE HISTORIES
CASE 4 -
INTEGRATING PRODUCTION LOG
 The adjacent SpectraScan Completion Image is from a south
Texas Vicksburg completion. The fracture treatment, which consisted
of 300,000 lb of bauxite proppant pumped at 25 bbl/min, was pumped
to conclusion (no screenout). The pad (yellow) and Zero
Wash® proppant tracers (red is 2-7 lb/gal and blue is 8
lb/gal) showed moderate concentrations in the perforated interval at
X425 ft to X440 ft and substantially higher concentrations in an
unperforated sand more than 300 ft up the wellbore (X080 ft to X110
ft). After the initial treatment, the well produced at the
anticipated rates of 2 MMcf/D and 400 BWPD.
According to the tracer interpretation, the
casing failed in the upper interval, allowing most of the fracture
treatment to be placed in this zone. This sand and several others
just above it had been targeted for a later stimulation
treatment.
A production log revealed that the casing had
indeed failed and that the upper interval was inadvertently
fractured. The log indicated significant water entry from the
perforated interval so the bottom zone was plugged to shut off water
production. Because the uphole sand was accidently stimulated, a
second fracture procedure was designed, in which much less bauxite
proppant was needed for the remaining uphole sands. This design led
to considerable cost savings, which paid for the completion
diagnostics many-fold.
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