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- Reservoir Technologies
- Hydraulic Fracturing and Acid Stimulation Inflow Assessment
- Reservoir Fluid In-flow Measurement from an Unconventional Oil Field Development
Reservoir Fluid In-flow Measurement from an Unconventional Oil Field Development
A customer requested a Tracerco fracture flow study that would allow oil
in-flow behavior to be measured following completion of an unconventional
well to better understand contribution from each stimulated interval.
Sixteen unique organic based tracers were selected for the project. Each
tracer was injected at the leading edge of individual hydraulic fracture
stages when first solids were added to the hydraulic fluids in order that
the tracer would penetrate deep into the fracture structure and make contact
with formation oil. During stimulation treatment, stage three was abandoned
due to operational issues. Subsequent back flow of the well and analysis
of tracer presence in oil samples allowed relative oil flow contribution
from each stage to be measured.
The horizontal oil well at 2km 928mTVD was located in the Eagle Ford Shale
and it was planned to carry out a 16 stage hydraulic fracture program. These
would be evenly distributed along the well bore length at 300 feet intervals.
The specialist oil based tracers have a high affinity for oil and are very
insoluble in water. As such they readily partition from the water into the
oil phase upon contact with reservoir oil and allow the source of oil flow
to be determined. The technology also allows confirmation that flow is occurring
from the toe end of a well through downhole equipment after stimulation
activities have been completed.
Following completion of the stimulation the well was flowed to clean up
and start production. 25ml samples of oil were collected on a regular basis
and analysis for tracer presence carried out using specialist equipment.
Results reveal initial oil flow from stages closer to the heel of the well
with mid point being very low and toe flow response from only the last two
stages. As flow continues, toe flow overall contribution increases but mid
well flow continues to be relatively low with as many as four stages contributing
zero to the overall production.
For more information about Reservoir Fluid In-flow Measurement technology
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