In the
multi-zone example (below left)
individual zonal
flow
as well as
inter-zonal flow can be
evaluated. Immediate
and longer term
production contribution analyses can enhance the information provided by
production logging runs.
The single zone
example (above right)
illustrates the
flowback of frac gel
traced with multiple
SpectraChem tracers.
In this application,
the flowback samples
can be analyzed to evaluate breaker efficiency and load recovery, thus providing valuable
information for
optimization and cost savings
in future completions.
Proper fluid and proppant
placement is paramount
to a successful fracture
stimulation treatment. Equally if not
more crucial is an understanding of
how treatment fluids are
performing during as
well as after that fracture
stimulation job. From these data
engineers are able to make informed
decisions about subsequent
stimulation
procedures.
With ProTechnics'new
SpectraChem (patent
pending) family of chemical
tracers, it is now possible to evaluate
frac fluid performance as well as
characterize and assess
zonal contribution in
multi-zone wells.
ProTechnics can introduce
up to 22 C.F.T.'s
(Chemical Frac Tracers) using a
precise PT-4000 injection system. The
C.F.T.'s are injected on the
low-pressure side of
the pumping units as an added
measure of safety and flexibility. The
SpectraChem (patent pending)
service, in combination
with SpectraScan®
and Completion
Profiler®, can provide valuable
data regarding:
Single Zone
Wells
Load Recovery
Gas
Breakthrough
Fluid Leakoff
Breaker Efficiency
Multi-Zone
Wells
Relative Zonal
Contribution
Relative Zonal Flow Capacity
Zonal
Slugging
Interzonal Flow
In this case history, the
operator per-formed six
individual fracs, using a
different chemical tracer in each frac
stage. His intent was to
determine whether or
not each fraced zone was
flowing back an appreciable volume
of frac load shortly after the frac as
well as after the fraced zones
were commingled. The
data suggest that zones
1 and 2 flowed back a modest
volume shortly after their fracs but
very little after they were commingled
with subsequent zones. Zone
3 flowed back a
significant volume
shortly after the frac but little if any
after it was commingled with
subsequent zones. Zone
4 flowed back a modest
amount both shortly after the
frac and after it was commingled
with subsequent zones. Zones 5 and
6 flowed back significant
volumes shortly after
the fracs but were not
sampled for an extended period of
time. These data proved useful in
helping to characterize the
commingled downhole
flow dynamics.
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