Brownfields: reevaluation and extended exploitation of old wells Enlarge economic reserves by: Increasing and improving our knowledge at field scale Increasing and improving our knowledge at well scale Doing smart workover of existing wells

1. 26 MAY 2010
© 2009 Baker Hughes Incorporated. All Rights Reserved.
Reevaluation and
extended exploitation of
old wells
Fabio Brambilla

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Mature fields and old wells
• Often exploited only after old conceptual plays
• Characterized by :
– Vintage seismic
– Geological knowledge not revised
– Pay zones definition not reevaluated
– Completion & Production aged practice

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Reserves delineation
How the reserves are defined
• Mckelvey diagram
I D E N T I F I E D U N D I S C O V E R E D
Economic
Sub
economic

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Reserves delineation
• Mckelvey diagram
I D E N T I F I E D U N D I S C O V E R E D
Economic
Sub
economic
$ €
Completion
Drilling
EOR

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Reserves delineation
• Mckelvey diagram
I D E N T I F I E D U N D I S C O V E R E D
Economic
Sub
economic
Geological
Geophysical
Reservoir
Knowledge

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Increase and add new reserves

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Identified New Reserves U N D I S C O V E R E D
Economic
Sub
economic
Geological
Geophysical
Reservoir
Knowledge
$ €
Completion
Drilling
EOR
I D E N T I F I E D

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Increase identified reserves
• Previous discarded
– Bypassed levels
– Not thick enough
– Looking for oil (not gas!)
• Not recognized levels
– Advancement on geophysical survey
– New petrophysical concepts
– New Formation evaluation capabilities

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Bronwfield & old wells: change the scenario
Brownfield:Brownfield:
landscapelandscape
of wells andof wells and
pumpspumps
Where yourWhere your
cash comescash comes

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Bronwfield & old wells: change the scenario
Brownfield:Brownfield:
landscapelandscape
of wells andof wells and
pumpspumps
Is itIs it
just ajust a
well ?well ?

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Bronwfield & old wells: change the scenario
Brownfield:Brownfield:
landscapelandscape
of wells andof wells and
pumpspumps
It is aIt is a
probeprobe
already inalready in
place !place !

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Looking old wells with a new eye
1. Lets Consider an old well as a probe already in place

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Increase economic reserves

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Increase Economic area
I D E N T I F I E D U N D I S C O V E R E D
Economic
Sub
economic
Geological
Geophysical
Reservoir
Knowledge
$ €
Completion
Drilling
EOR

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Looking old wells with a new eye
1. Lets Consider an old well as a probe already in place
and
2. It is already a well in your field !!
Killed
levels
By passed
level

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Some “probe” exploitations

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Improve geophysical knowledge: VSP

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Improve geophysical knowledge: VSP
•AVOAVO investigation using walkaway VSP
data
•Several walkaway lines centered about the
well location can be used to investigate AVAAVA
effects

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Improve seismic interpretation
• Well seismic survey
– Improve the quality in
reinterpretation of old
seismic lines
– Reduces uncertainty in
surface seismic
interpretation.
– Enhance subsurface
structural and
stratigraphic details
– Revealing hidden
geological features

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Find additional pay
• By passed drilled levels
– Multilevel reservoirs
– Single completion over 2 or more levels
– Better vertical resolution
• Improving knowledge of geological setting
– Clastic environment
– Discontinuous reservoirs

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Recognize by passed oil-gas levels
• Understand your reservoir and identify new opportunity
– Formation Evaluation in cased hole conditions
• Pulsed Neutron and Carbon/Oxygen logs (RPM)
– Reevaluation of volumes of oil & gas in place
– Identification of new reserves increasing the field life
– Better delineation of pay bodies
– Identification of actual water tables for planning infilling-lateral holes
• Tubing does not have to be pulled, rigless operations
• Well is not required to be off production

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•SituationSituation
Operator of a mature
field and multilayers
pays is looking for
production
opportunities
•ObjectiveObjective
Identify production
opportunities in
complex completions.
• ComplicationComplication
Complex completions
including blast joints
trap oil, gas, and water
in the annulus.
•SituationSituation
Operator of a mature
field and multilayers
pays is looking for
production
opportunities
•ObjectiveObjective
Identify production
opportunities in
complex completions.
• ComplicationComplication
Complex completions
including blast joints
trap oil, gas, and water
in the annulus.
Saturation Measurements in Complex Completions
RPM (Reservoir Performance Monitor)

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Saturation Measurements in Complex Completions
RPM (Reservoir Performance Monitor)
•Solution
•RPM-CO log was
run and processed
using Dynamic
Response Generator
to account for
annular fluids
procedure.
•Results identified
production
opportunities that
upon re-completion
produced oil.
•Solution
•RPM-CO log was
run and processed
using Dynamic
Response Generator
to account for
annular fluids
procedure.
•Results identified
production
opportunities that
upon re-completion
produced oil.

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gas
PNC data
OH data
Expansion of gas cap
Gas, Oil, Water
RPM Case Histories

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Workover in double completion

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Completion issue
New
level

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Orienting perforation
• Dual tubing completion
EMO – Electro-Magnetic Orienting Perforating
• Oriented perforating in the direction opposite the lower
interval production string (long string) is accomplished with
through-tubing perforating using the EMO system.
• Using the properties of electro-magnetism to detect the mass
of the long string and
• incorporating a rugged downhole motor and anchor, the
perforating guns can be selectively rotated to a position to
fire opposite the long string.

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Conclusion
• Enlarge economic reserves
1. Increasing and improving our
knowledge at field scale
2. Increasing and improving our
knowledge at well scale
3. Smart workover of existing wells
GeophysicalGeophysical
FormationFormation
evaluationevaluation
CompletionCompletion
WellWell
managementmanagement

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I D E N T I F I E D
U N D I S C O V E R E D
Economic
Sub
economic
$ €
Completion
Drilling
EOR
G
eological
G
eophysical
Reservoir
Knowledge
1 + 2 + 3
1111
2222
3333

30. © 2009 Baker Hughes Incorporated. All Rights Reserved.30
Summary
• Increase economic reserves
– Better and improved knowledge
– Smart workover of existing wells
• Exploitation of new E&D techniques
– Geophysical data
– New Formation evaluation solutions
– Revising the status of each wells

31. 11/06/16
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Thanks for your attention