Reservoir performance is dependent upon
system interaction between the completion hardware, the wellbore reservoir
section and its connection to surface. A-priori condition used to design a
robust completion solution are housing units capable of draining and collecting
fluids along the entire completion length and simultaneously produce oil while
delaying more mobile fluids. Therefore the completion design should focus
on:
- Those scenarios that are expected to have greater impact in the
producer wells: These include for example PI increase, adjusting drawdown
pressure, flux balancing, delaying early entry of high mobile water or gas
along the entire completed interval, well clean-up through time and extending
well production life.
- Wether it is expected to accelerate initial production or balanced
management of the field. The goal in both cases is to achieve efficient area
drainage and uniform sweep while not leaving by-passed oil in the ground.
- Whether the contingency plans are for, alternative re-completions or
preparing the wellbore for future operations such as EOR related activities to
stimulate production from much lower oil residual saturations.
- Having hardware ready that allows changes in operational modes from
producer to injectors or viceversa, or permits installation of slim hole units,
technologies to enhance porosity or permeabilty, reduce viscosity and mobility
ratios, implement fine reservoir characterization models, avoid reaching
ultra-high WCUT too soon or to implement intermediate EOR operations to slow
down this tendency.
In Ecuador, an operator has completed several wells equipped with ICDs,
in both consolidated and non-consolidated reservoirs and with variable rock and
fluid properties including viscosities varying between 4 to 47 cP. This paper
describe the combination of ICD design, geo-steerirng, calibration with
real-time log data, installation procedures and fluid historical production
results through time.
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